BS EN 74-1-2005 False work & scaffolds.pdf

I S B © e s n e c i l / m o c . p u o r g i s b . w w w s s e c c a r e s u i t l u m r o F . d e k r o w t e n / d e t u b i r t s i d e b o t t o N . n o i s r e v t s e t a L 2 3 : 2 1 2 1 0 2 / 0 1 / 3 2 n o , E A U l h a t S l r a C , b a a S s i o c n a r F . r M y b t h g u o B

BRITISH STANDARD

Couplers, spigot pins and baseplates for use in falsework and scaffolds — Part 1: Couplers for tubes — Requirements and test procedures

The European Standard EN 74-1:2005 has the status of a British Standard

ICS 91.220

          

BS EN 74-1:2005

BS EN 74-1:2005 I S B © e s n e c i l / m o c . p u o r g i s b . w w w s s e c c a r e s u i t l u m r o F . d e k r o w t e n / d e t u b i r t s i d e b o t t o N . n o i s r e v t s e t a L 2 3 : 2 1 2 1 0 2 / 0 1 / 3 2 n o , E A U l h a t S l r a C , b a a S s i o c n a r F . r M y b t h g u o B

National foreword This British Standard is the official English language version of EN 74-1:2005. It supersedes BS 1139-2.1:1991 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee B/514, Access and support equipment, to Subcommittee B/514/21, Access and working scaffolds and their components (props, tubes and coup lers), which has the responsibility to: —

aid enquirers to understand the text;

—

present to the responsible international/European committee any enquiries on the interpretation, or p roposals for change, and keep UK interests informed;

—

monitor related international and European developments and promulgate them in the UK.

A list of organizations represented on this subcommittee can be obtained on request to its secretary. Additional information BS EN 74-1:2005 specifies test procedures to establish whether couplers meet with the criteria specified. The characteristic structural parameters for couplers for use in design are not given in BS EN 74-1:2005 but in BS EN BS EN 12811-1:2003, Annex C. It is the intention of BSI Committee B/514 that once EN 74-2 and EN 74-3 of EN 74 are finalized, a separate guidance document should be published to facilitate the use of this series of standards in the UK. Textual errors The textual errors set out below were discovered when adopting the text of the European standard. They have been reported to the DIN Secretariat in a proposal to amend the text of the European standard. In Table 8 and Table 9, in the ‘‘Clause’’ column, for all references the initial ‘‘8’’ should be replaced by ‘‘7’’. In Table 10, in the NOTE, ‘‘7.1’’ should read ‘‘6.1’’.

Summary of pages This document comprises a front cover, an inside front cover, page i, a blank page, the EN title page, pages 2 to 42, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2006

© BSI 2006

ISBN 0 580 49096 3

Amendments issued since since publication Amd. No.

Date

Comments

BS EN 74-1:2005 I S B © e s n e c i l / m o c . p u o r g i s b . w w w s s e c c a r e s u i t l u m r o F . d e k r o w t e n / d e t u b i r t s i d e b o t t o N . n o i s r e v t s e t a L 2 3 : 2 1 2 1 0 2 / 0 1 / 3 2 n o , E A U l h a t S l r a C , b a a S s i o c n a r F . r M y b t h g u o B

In Table B.2, column 3, ‘‘8.2.1’’ and ‘‘8.2.2’’ should read ‘‘7.2.1’’ and ‘‘7.2.2’’ respectively. In Table B.2, column 4, ‘‘BRB’’ should read ‘‘RB’’. In the NOTE below Table B.2, ‘‘Table 6’’ should read ‘‘Table 7’’. Cross-references The British Standards which implement international or European publications referred to in this document may be found in t he BSI he BSI Catalogue under Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI the BSI Electronic Catalogue or Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.

i

I S B © e s n e c i l / m o c . p u o r g i s b . w w w s s e c c a r e s u i t l u m r o F . d e k r o w t e n / d e t u b i r t s i d e b o t t o N . n o i s r e v t s e t a L 2 3 : 2 1 2 1 0 2 / 0 1 / 3 2 n o , E A U l h a t S l r a C , b a a S s i o c n a r F . r M y b t h g u o B blank


EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM

EN 74-1 October 2005

ICS 91.220

Supersedes EN 74:1988

English Version

Couplers, spigot pins and baseplates for use in falsework and scaffolds - Part 1: Couplers for tubes - Requirements and test procedures Raccords, goujons d'assemblages et semelles pour étaiement et échaffaudages de service - Partie 1: Raccords pour tubes - Exigences de performance et méthodes d'essai

Kupplungen, Zentrierbolzen und Fußplatten für Arbeitsgerüste und Traggerüste - Teil 1: Rohrkupplungen Anforderungen und Prüfverfahren

This European Standard was approved by CEN on 26 August 2005. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36

© 2005 CEN

All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.

B-1050 Brussels

Ref. No. EN 74-1:2005: E


EN 74-1:2005 (E)

Contents

Page

Foreword ....................................................... ................................................................ ...................................3 Introduction......................................................................................................................................................4 1

Scope ................................................ .......................................................... .........................................5

2

Normative references ...................................................... ...................................................................5

3 3.1 3.2

Terms, definitions and symbols ....................................................... .................................................5 Terms and definitions.........................................................................................................................6 Symbols and abbreviations................................................................................................................6

4 4.1 4.2

Types and classes of couplers .................................................... ......................................................7 Types of couplers ............................................................ ...................................................................7 Classes of couplers ............................................................. ...............................................................7

5

Reference tubes and bar for coupler tests......................................................................................12

6 6.1 6.2 6.3 6.4

General requirements ...................................................... ................................................................. 13 Materials .................................................... ....................................................... .................................13 Design................................................................................................................................................13 Manufacturer's drawing....................................................................................................................16 Production .......................................................... ..................................................................... ..........16

7 7.1 7.2 7.3 7.4 7.5

Test methods and evaluation of results..........................................................................................16 General ........................................................... ........................................................... ........................16 Slipping and failure force .................................................... .............................................................19 Pull-apart force F p (RA).....................................................................................................................26 Stiffnesses and ultimate moments ................................................................. .................................27 Indentation (RA,SW,PA) ...................................................... .............................................................34

8

Designation ........................................................ ........................................................... ....................36

9

Marking ...................................................... ........................................................... .............................36

10

Test report ..................................................... ....................................................... .............................37

11

Evaluation of test results..................................................................................................................37

12

Assessment.......................................................................................................................................37

13

Product manual.................................................................................................................................37

Annex A (normative) Whitworth thread size 1/2 X 12 Tpi ..........................................................................38 A.1

Nominal values.................................................................................................................................38

A.2

Tolerances and limiting dimensions after coating ................................................................... ......39

Annex B (informative) Ongoing production control.................................................................... ...............40 Bibliography...................................................................................................................................................42

2


EN 74-1:2005 (E)

Foreword This European Standard (EN 74-1:2005) has been prepared by Technical Committee CEN/TC 53 “Temporary works equipment”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2006, and conflicting national standards shall be withdrawn at the latest by April 2006. When published this European Standard supersedes the requirements for couplers specified in EN 74:1988. There are additional requirements for some couplers. The couplers specified in this European Standard are intended for use in scaffolds erected in accordance with EN 12811-1 and falsework erected in accordance with EN 12812. This European Standard is not mandated at the time of publication. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

3


EN 74-1:2005 (E)

Introduction This is the first of three parts of a European Standard which supersedes EN 74:1988. This first part, EN 74-1, covers common types of friction couplers. The second part, EN 74-2, deals with other less common types of couplers. The third part, EN 74-3, deals with plain base plates and loose spigot pins. Until this part is available the respective clauses of EN 74:1988 remain valid. EN 74-1 defines a set of steel and aluminium reference tubes for the required tests. EN 74-1 is not intended to prevent the development of other types of couplers. For example couplers may be manufactured in aluminium or other materials or be designed for use with steel or aluminium tubes other than the normally used 48,3 mm nominal outside diameter. Whilst such couplers cannot comply with this European Standard, it is recommended that the principles of this European Standard are considered in their design and assessment. The couplers in this European Standard are intended for use in scaffolds and falsework for connecting 48,3 mm outside diameter steel and aluminium tubes which fulfil in other respects (e.g. material grade, thickness and tolerances) the requirements given in EN 12811-1, EN 12811-2 and EN 12810-1.

4


EN 74-1:2005 (E)

1

Scope

This European Standard specifies, for right angle couplers, swivel couplers, sleeve couplers and parallel couplers working by friction: 

materials;



design requirements;



strength classes with different structural parameters including values for resistance and stiffness;



test procedures;



assessment;

and gives 

recommendations for ongoing production control.

For testing, screw couplers are tightened to a torque of 50 Nm and wedge couplers are tightened with a 500 g hammer until the jarring blow.

2

Normative references

The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10002-1, Metallic materials — Tensile testing — Part 1: Method of test at ambient temperature EN 12811-1:2003, Temporary works equipment — Part 1: Scaffolds — Performance requirements and general design EN 12811-2:2004, Temporary works equipment — Part 2: Information on materials EN 12811-3:2002, Temporary works equipment — Part 3: Load testing EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs (ISO 898-1:1999) EN 20898-2, Mechanical properties of fasteners — Part 2: Nuts with specified proof load value -; Coarse thread (ISO 898-2:1992) EN 12812, Falsework — Performance requirements and general design

3

Terms, definitions and symbols

For the purposes of this European Standard, the terms and definitions given in EN 12811-1:2003 and the following apply.

5


EN 74-1:2005 (E)

3.1

Terms and definitions

3.1.1 coupler device used for connecting two tubes 3.1.2 wedge coupler coupler in which the clamping force is obtained by tightening a flap around the tube by means of hammering home a wedge 3.1.3 screw coupler coupler in which the clamping force is obtained by tightening a flap around the tube by means of a nut and a bolt 3.1.4 supplementary coupler right angle coupler positioned touching an identical coupler in order to increase the slip resistance 3.1.5 assessment checking process to establish compliance with the requirements specified in this European Standard

3.2

Symbols and abbreviations

For the purpose of this European Standard, the following symbols apply: 

F s

slipping force in kN;



F f

failure force in kN;



F p

pull apart force in kN;



M B

bending or cruciform bending moment in kNm;



c ϕ(i),MB

cruciform bending stiffness in kNm/rad;



M T

rotational moment in kNm;



c ϕ,MT

rotational stiffness in kNm/rad;



F s,c

specified value for slipping force in kN;



F f,c

specified value for failure force in kN;



F p,c

specified value for pull apart force in kN;



M B,c

specified value for bending moment in kNm;



c ϕ(i),MB,c specified value for cruciform bending stiffness in kNm/rad;



M T,c

specified value for rotational moment in kNm;



c ϕ,MT,c

specified value for rotational stiffness in kNm/rad;

6


EN 74-1:2005 (E)

displacement in millimetres of the transverse tube under load relative to a tube or solid bar in rotational tests;



ν



∆i

displacement in millimetres of a coupler under load relative to a tube or solid bar;



∆10

indentation in millimetres;



P

test load in kN;



P ind

test load for indentation in kN;



ϕ

specified angle of rotation of a coupler in degrees;



P f,ult

load bearing capacity of a coupler at failure;



P p,ult

load bearing capacity of a coupler for pull apart;



M ult

capacity of a coupler of cruciform bending ultimate moment;



R eH

yield strength;



R p,0.2

proof stress at elongation of 0.2 %;



R m

tensile strength;

4

Types and classes of couplers

4.1

Types of couplers

The types of couplers are listed in Table 1. Table 1 — Types of couplers Type of coupler

4.2 4.2.1

Identification

Arrangement of tubes

Right angle coupler

RA

Crossing at a right angle

Swivel coupler

SW

Crossing at any angle

Parallel coupler

PA

Parallel

Sleeve coupler

SF

End to end coaxially

Classes of couplers General

The classes for each type of coupler are given in Table 2.

7


EN 74-1:2005 (E)

Table 2 — Classes of couplers Type of coupler

Class A

B

AA

BB

Right angle coupler

■

■

■

■

Swivel coupler

■

■

-----

-----

Parallel coupler

■

■

-----

-----

Sleeve coupler friction type

■

■

-----

-----

Specified class

■

NOTE Classes A and B differ in transmissible internal forces and moments and in values of load bearing capacity and stiffness. Couplers of classes AA and BB, used as single couplers have the same characteristics as couplers of classes A and B respectively, but they may also be used to increase slipping capacity if two identical couplers AA+AA or BB+BB are positioned touching each other.

4.2.2

Transmissible internal forces, moments and related stiffnesses

In general a connection between two tubes is able to transmit three forces and three moments at right angles to each other with related stiffness. Tables 3 to 6 show which structural parameters apply. See Table 8 for values for testing purposes. NOTE

8

Longitudinal stiffness may be derived from load – displacement curves for slipping forces.


EN 74-1:2005 (E)

Table 3 — Structural parameters for right angle couplers (RA) Structural parameters t n e ) m o 1 m e r r u o i g e F ( c r o F n o s i t s c e e n n f f n i t o s C ■

*

Class A and AA

B and BB

Slipping force F s

■

■

Rotational moment M T *

---

■

Pull apart force F p

■

■

Failure force F f

■

■

Cruciform bending moment M B*

---

■

Rotational stiffness c ϕ,MT*

---

■

Cruciform bending stiffness c ϕ,MB

---

■

R esistance or stiffness specified Only for screw couplers

Figure 1 — Forces and moments for a right angle coupler

9


EN 74-1:2005 (E)

Table 4 — Structural parameters for swivel couplers (SW) Class

Structural parameter A

B

1

Slipping force F s (Figure 2)

■

■

2

Failure force F f (Figure 2)

■

■

Resistance specified

■

Figure 2 — Forces for a swivel coupler

Table 5 — Structural parameters for parallel couplers (PA) Class

Structural parameter

B

1


■

■

2

Failure force F f (Figure 3)

■

■

■

10

A



EN 74-1:2005 (E)

Figure 3 — Forces for a parallel coupler

Table 6 — Structural parameters for sleeve couplers (SF) Structural parameters

1


2

Bending moment M B (Figure4)

■

Class A

B

■

■

---

■


11


EN 74-1:2005 (E)

Figure 4 — Forces and moments for a sleeve coupler

5

Reference tubes and bar for coupler tests

The specified outside diameter of all tubes and bars shall be 48,3 mm with a tolerance for tubes of ± 0,5 mm and for bars of ± 0,2 mm. Reference tubes shall be used that are selected from normal production whose properties lie within the tolerance bands specified in Table 7. The tubes shall be unused and steel tubes shall be hot dip galvanized in accordance with EN 12811-2 class C2 of corrosion protection. Table 7 — Reference tubes and bar for coupler tests

Reference Structural form

Material

Yield strength or hardness

Wall thickness

Wall thickness tolerance mm

2

2

3.2 mm

+ 0,1 - 0,2 (including corrosion resistance)

2

2

2.7 mm


2

2

4.0 mm


2

2

4.0 mm

+ 0,1 - 0,2

RTS1

Tube

Steel

235 N/mm ≤ R eH ≤ 265 N/mm

RTS2

Tube

Steel

315 N/mm ≤ R eH ≤ 345 N/mm

RTS3

Tube

Steel

235 N/mm ≤ R eH ≤ 265 N/mm

RT A

Tube

Alluminium alloy

195 N/mm ≤ R eH ≤ 215 N/mm

RB

Bar

Steel

250 Brinell

12

See Clause 5


EN 74-1:2005 (E)

6

General requirements

6.1

Materials

All elements of couplers shall be made of steel or cast iron and shall fulfil the requirements given in European Standards where design data are provided. Some information about those most commonly used is given in EN 12811-2. Elements shall be protected against atmospheric corrosion in general in accordance with EN 12811-2. Electrolytical zinc coating Cz with an average thickness of 15 µm conforms to 8.1 of 12811-2:2004. For screw and nut connection, other corrosion protection which is specified in EN or ISO standards may be applied. It shall be shown that they achieve at least equivalent protection. When tested to EN 10002-1, cast irons shall have a minimum elongation of 5 % on ultimate strength where l o = 3d.

6.2

Design

6.2.1 A coupler model of a defined type and class shall conform to all requirements specified in Table 8. It means for any structural parameter that the evaluated test results shall be equal or exceed the specified values in this European Standard except for indentation. The characteristic values and safety coefficients to be applied for use shall be as given in EN 12811-1 and in EN 12812. 6.2.2 The design of couplers shall be such that after tightening onto any steel or aluminium tube given in Clause 5 and tightened in accordance with 7.1.7 and 7.1.8, there shall be significant effective travel on the nut or wedge. NOTE Experience shows that 2 mm of thread or wedge remaining and a minimum gap of 2 mm between the closing flap and the body are suitable li mits.

6.2.3 A coupler shall be manufactured so that the elements cannot be separated during normal service condition. The bolt class shall be at least M12. The bolt strength class shall be at least grade 5.6 in accordance with EN ISO 898-1. The proof load on each bolt, R p 0.2, shall not be less than 32,2 kN and the R eH/R M ratio not greater than 0,8. The recommended bolt is M14x2, with tolerances in accordance with ISO 965. ”

½ Whitworth threads shall comply with Annex A. The nut and bolt combination shall be in accordance with EN 20898-2. The nut shall be one of the following: 

plain hexagonal nut with a separate loose washer; or



special flanged hexagonal nut having an integral fixed washer flange; or



special hexagonal nut incorporating an integral rotating washer.

The outside diameter of the washers or nut flanges shall be at least equal to the measurement across the corners of the hexagonal nuts at specified dimensions + 2 mm. The washer or nut flange thickness shall not be less than 2,5 mm. A loose washer shall have a hardness of between 200 HV and 300 HV.

13


EN 74-1:2005 (E)

NOTE Research has shown that the slipping resistance is dependant on the bolt tension. For a given torque this tension is considerably increased when the integral friction coefficient on the thread is low. This integral friction coefficient is significantly influenced by the t ype of corrosion protection and by the lubrication of the bolt and nut connection.

6.2.4 The correct installation of the tubes in the sleeve couplers shall preferably be achieved automatically by the design of the coupler, e.g. by a self-centring device; otherwise it shall be very easy to verify visually that it is correctly assembled. 6.2.5

An AA or BB coupler shall also fulfil the performance requirements of A and B couplers.

6.2.6 A coupler shall not cause an indentation greater than that specified in Table 8 when tested in accordance with 7.5.

14

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EN 74-1:2005 (E)

Table 8 — Test parameters and specified values COUPLER CLASS Type

Property parameter

Symbols

Clause

Test parameter

A

AA

B

COUPLER CONFIGURATION BB

AA/AA

BB/BB

SPECIFIED VALUES

Slipping force

F s,c

8.2.1

Failure force

F f,c

8.2.2

stiffness

c ϕ,MT,c

moment

M T,c

Rotation

) A R ( s r e l p u o c e l g n a t h g i R

s r e l p u o c ( l e v i w S

15,0 kN

10,0 kN

15,0 kN

15,0 kN

25,0 kN

1 ≤ ∆5 ≤2 mm

-

P f,ult

20,0 kN

-

M T = ± 0,13 kNm

-

7,5 kNm/rad

1° ≤ θ ≤ 2°

-

0,13 kNm

30,0 kN

30,0 kN

45,0 kN

15,0 kN

25,0 kN

-

-

P p,ult

20,0 kN

30,0 kN

-

-

c ϕ1,MB,c

M B/1,65 =0.48 kNm

-

15,0 kNm/rad

-

-

c ϕ2,MB,c

M B=0,8 kNm

-

6,0 kNm/rad

-

-

Cruciform bending aluminium tube

c ϕ1,MB,c

M B/1,65=0,48 kNm

-

13,0 kNm/rad

-

-

c ϕ2,MB,c

M B=0,8 kNm

-

5,0 kNm/rad

-

-

M ult,c

2M B

-

1,6 kNm

-

-

P ind = 6,67 kN

≤ 1,5 mm

-

-

-

P ind = 10,0 kN

-

≤ 1,5 mm

-

-

∆1 ≤ 7 mm

7,0 kN

10,0 kN

-

-

Cruciform bending ultimate moment

on

8.4.1

∆10

Indentation

8.5 F s,c

Slipping force

Failure force Indentation

8.2.1

F f,c ∆10

8.2.2 8.5

F s,c 8.2.1

r e l e v e p ) u e l o F S c S (

10,0 kN

1 ≤ ∆2 ≤2 mm

F p,c

Slipping force r e l p u o C l e l l ) a r A a P P (

10,0 kN

Cruciform bending stiffness on steel tube stiffness

8.3

7,0 kN

Pull apart force

)

W S (

8.4.2

∆1 ≤ 7 mm

Failure force

F f,c

8.2.2

∆10

Indentation

1 ≤ ∆2 ≤ 2 mm

10,0 kN

15,0 kN

-

-

P ult

14,0 kN

20,0 kN

-

-

P ind = 4,7 kN

≤ 1,5 mm

-

-

-

P ind = 6,67 kN

-

≤ 15 mm

-

-

∆1 ≤ 7 mm

7,0 kN

10,0 kN

-

-

1 mm ≤ ∆2 ≤ 2 mm

10,0 kN

15,0 kN

-

-

P ult

20,0 kN

30,0 kN

-

-

P ind = 6.67 kN

≤ 1,5 mm

-

-

-

8.5 P ind = 10.0 kN

-

≤ 1,5 mm

-

-

Slipping force

F s,c

8.2.1

1≤ ∆2 ≤2 mm

6,0 kN

9,0 kN

-

-

Bending moment

M B,c

8.4.3

∆4 = 5 mm

-

1,4 kNm

-

-

15


EN 74-1:2005 (E)

6.3

Manufacturer's drawing

For each coupler model, the manufacturer shall record on the drawings sufficient information for unambiguous identification and as a reference for subsequent inspection. a)

geometry;

b)

dimensions and tolerances;

c)

mass with tolerance;

d)

material specification for each element of the coupler;

e)

type of surface protection for each element of the coupler.

6.4

Production

6.4.1 An appropriate method of quality control during a production program shall ensure that couplers satisfy the performance requirements of this European Standard and that they comply with the manufacturer’s drawings. NOTE

Annex B gives recommendations for ongoing production control.

When the ongoing production control follows one of the inspection methods set out in Annex B, it may be assumed that the couplers produced under this regime satisfy the requirements of this clause. 6.4.2 When ongoing production control procedures differ from those recommended in Annex B, they should be drawn up by a person competent to do so. NOTE Although it is not a requirement of this European Standard, it is recommended that manufacturers submit their production control procedures periodically to third party inspections.

7

Test methods and evaluation of results

7.1

General

7.1.1 The minimum number of tests carried out on different types and classes of each coupler shall be in accordance with Table 9. 7.1.2 The specimen required for testing shall be randomly selected (see ISO 2859) from a batch of at least 500 couplers. 7.1.3 Unused couplers shall be used for all tests except that, for ultimate load tests, those used for slip tests may be reused. 7.1.4 Where the performance of a coupler depends on the load direction, the more unfavourable load direction shall be tested. 7.1.5 All test equipment shall have an accuracy ≤ 1 %. With exception, a torque wrench may have an accuracy of at least ± 5 %. 7.1.6 When testing screw couplers the conditioning for thread and bolt and nut connection shall be in accordance with the statement regarding lubrication given in t he product manual (see Clause 13 e)). 7.1.7 7.1.5.

16

Screw couplers shall be tightened with a torque of 50 Nm applied with a torque wrench conforming to


EN 74-1:2005 (E)

7.1.8

Wedge couplers shall be tightened with a 500 g hammer until the jarring blow is reached.

7.1.9 Before carrying out the slip tests in accordance with 7.2.1 and 7.4.2, couplers shall be tightened and untightened 5 times. 7.1.10 Slip test loads shall not be applied until 10 min after tightening the coupler. 7.1.11 Reference tubes and bars shall be in accordance with Table 7. 7.1.12 When a right angle coupler model is tested for classes AA or BB the second coupler, which shall be an identical model to the first, shall be positioned touching the first for the slipping test.

17

Bought by Mr. Francois Saab,Carl Stahl UAE,on 23/10/2012 12:32 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license © BSI

EN 74-1:2005 (E)

Table 9 — Minimum number of tests for each coupler type and class and configuration

Number of tests Type of coupler

Coupler class

A AA

Right angle coupler (RA)

---------

RTS2 -----

RTS3 -----

RT A 5 ---

RB --5

8.2.1 8.2.2

---

---

---

---

5

8.3

--10 ---

5 -----

-------

--5 ---

----5

8.5 8.2.1 8.2.2

---

---

---

---

5

8.3

10

---

---

5

---

8.4.1

5

----

---

5

---

8.4.2

---

5

---

---

---

8.5

F s

10

---

---

5

----

8.2.1

Slipping force F s Failure force F f Indentation Slipping force F s Failure force F f Indentation

10 ----10 -----

----5 ----5

-------------

5 ----5 -----

--5 ----5 ---

8.2.1 8.2.2 8.5 8.2.1 8.2.2 8.5

Slipping force

10

---

---

5

---

8.2.1

---

---

---

---

8.4.3

F p

-----------

Reference tubes (see Table 7) RTS1 10 ---

Slipping force F s Failure force F f Pull apart force Indentation Slipping force F s Failure force F f Pull apart force

B BB

Clause

Type of test

Coupler configuration

F p

Cruciform bending moment M B

Rotational moment M T Indentation

Swivel coupler (SW) Parallel coupler (PA)

-----

AA + AA BB + BB

A B

----------

A B

----------

A B Sleeve coupler (SF)

18

B

--------------------

Slipping force

F s

Bending moment M B

5


EN 74-1:2005 (E)

7.2

Slipping and failure force

7.2.1 7.2.1.1

Slipping force F s (RA,SW,PA,SF) Purpose of test

To determine the resistance of F s of a coupler to slipping along a tube and the relative displacements between the tube and the coupler. 7.2.1.2

Test arrangements

For right angle and swivel couplers, provide equipment to apply a test load P to the transverse tube at two points equidistant from the axis and not more than 125 mm from it, see Figures 5 and 6. Support the basic tube laterally at two points not more than 500 mm apart. Make provision for measuring the displacement ∆1 between the transverse and the basic tubes and ∆2 between the back of the coupler and the basic tube. For parallel couplers, which are tested in pairs for slip, see Figure 7, support each tube outside the coupler, with the two supports not more the 1 000 mm apart. The couplers shall be not more than 400 mm apart. Make provision for measuring the displacement ∆1 between the two tubes and ∆2(1) and ∆2(2) between each coupler and the tube to which it is fixed. For sleeve couplers provide equipment to apply a test load P axially at the ends. Make provision for measuring the displacement ∆1 between two points each 250 mm from the centre of the coupler.

19


EN 74-1:2005 (E)

Key 1, 2

reference tube RTS1 – RT A

3

bearing used to guide the tube

b

≤ 250

mm

m

≤ 500

mm

Figure 5 — Test arrangement for the slipping force F s of right angle couplers and swivel couplers

20


EN 74-1:2005 (E)

Key 1, 2 3 b m

reference tube RTS1 – RT A bearing used to guide the tube ≤ 250 mm ≤ 500 mm

Figure 6 — Test arrangement for the slipping force F s of right angle couplers with the configuration AA+AA or BB+BB

21


EN 74-1:2005 (E)

Key 1, 2 3 b m

reference tube RTS1 – RT A bearing used to guide the tubes ≤ 1 000 mm ≤ 400 mm

Figure 7 — Test arrangement for the slipping force F s of two parallel couplers

Key 1,2

reference tubes RTS1 – RT A

b

= 500 mm Figure 8 — Test arrangement for the slipping force F s of a sleeve coupler

7.2.1.3

Requirements for initial load

Apply an initial load P to establish the zero for displacement measurements. Make this initial load P = 0,4 kN for right angle couplers and a negative initial load P = - 0,1 kN for swivel couplers. Do not provide an initial load for parallel couplers and sleeve couplers. 7.2.1.4

Test procedure

The test load P (i) shall be increased uniformly at a rate not exceeding 0,3 kN per second until the coupler begins to slip. Thereafter, a rate of slip of 2,0 mm per minute shall not be exceeded.

22


EN 74-1:2005 (E)

Load displacement curves P (i) = f (∆i) shall be plotted until either: a)

displacement ∆i reaches the maximum value given in Table 8; or

b)

test load P (i) reaches a value twice the specified value FS given in Table 8; or

c)

test load P (i) reaches a value after which the load cannot be usefully increased.

The plotted load displacement curves (P (i) = f (∆i)) shall include at least one displacement measurement point for every 1,0 kN increase in load P . 7.2.1.5

Evaluation of test results

The slipping force F s(i) of the specimen is the lowest test load P (i) measured when the displacement ∆2 is between 1 mm and 2 mm. Analyse the results F s(i) statistically in accordance with EN 12811-3 to determine the 5 % quantile F s5%. The value F s5% shall not be less than the specified value F s,c from Table 8. 7.2.2 7.2.2.1

Failure force F f (RA,SW,PA) Purpose of test

To determine the resistance of F f, of a coupler at failure. 7.2.2.2

Test arrangements

The test arrangements for right angle couplers of classes A, B, AA and BB and for swivel couplers are shown in Figure 9. The coupler, which shall be located touching the abutment, is fixed on the basic solid bar to prevent the coupler sliding during the test. The abutment shall be on the side of the basic solid bar remote from the transverse bar. The test arrangement for a parallel coupler is shown in Figure 10. The coupler, which shall be placed touching the abutment, is fixed on the basic solid bar to prevent the coupler sliding during the test. The abutment shall be on the side of the basic bar remote from the abutment.

23


EN 74-1:2005 (E)

Key 1, 2

bar RB

3

bearing used to guide the bar

4

abutment

b

≤ 250

mm

m

≤ 500

mm

Figure 9 — Test arrangement for the failure force F f for a right angle coupler and for a swivel coupler

24


EN 74-1:2005 (E)

Key 1

bar RB

2

abutment

3

bearing used to guide the bar

4

thrust pad

m

= 500 mm

n

= 120 mm

s

= 3 mm

ød2

= 48,3 mm ± 0,2 mm

ød1

≥ 60 mm

Figure 10 — Test arrangement for failure force F f for a parallel coupler 7.2.2.3

Test procedure

Increase the test load P (i) displacement controlled with not more than 2 mm per min until either: a)

coupler component fractures; or

b)


Record the load displacement curves with the maximum test load P (i) and the nature of the failure. 7.2.2.4


The failure force resistance F f(i) of each specimen is the maximum test load P (i). Analyse the results of F (i) statistically in accordance with EN 12811-3 to determine the 5 % quantile F f,5%. Apply an additional partial safety factor γ R2 which shall be taken either as 1,25 or may be determined in accordance with EN 12811-3. The value F f,5%/ γ R2 shall not be less than t he specified value F f,c from Table 8.

25


EN 74-1:2005 (E)

7.3

Pull-apart force F p (RA)

7.3.1

Purpose of test

To determine the resistance of F p of the coupler by separating into two parts. 7.3.2

Test arrangement

Provide equipment to apply a test load P to the solid bar at two points equidistant from the axis and not more than 150 mm from it, see Figure 11.

Key 1, 2

bar RB

b

≤ 150

mm

Figure 11 — Test arrangement for pull apart force of a right angle coupler 7.3.3

Test procedure

Increase the test load P (i) displacement controlled with not more than 2 mm per minute until either: a)

coupler component fractures; or

b)


Record the maximum test load P (i) and the nature of the failure. 7.3.4


The pull apart resistance F p(i) of each specimen is the maximum test load P (i). Analyse the results of F p,(i) statistically in accordance with EN 12811-3 to determine the 5% quantile F p,5%. Apply an additional partial safety factor γ R2 which shall be taken either as 1,25 or may be determined in accordance with EN 12811-3. The value F p,5 %/ γ R2 shall not be less than the specified value F p,c from Table 8.

26


EN 74-1:2005 (E)

7.4

Stiffnesses and ultimate moments

7.4.1

Cruciform bendingstiffness c ϕ1,MB and c ϕ2,MB and bending moment M B (RA)

7.4.1.1

Purpose of test

To determined the bending moment of resistance M B and the cruciform bending stiffness c ϕ1,MB and c ϕ2,MB of a coupler. Test arrangements

7.4.1.2

Set the equipment up in accordance with Figure 12, with the length of the basic tube not exceeding 1 000 mm plus the width of the coupler. Provide equipment to apply a test load P to one end of the transverse tube parallel to the axis of the basic tube at the distance of 750 mm from the central axis. Provide equipment on the side away from the test load P to measure the change in the angle ϕ between the original and the displaced axes.

Key 1, 2

reference tube RTS1 – RT A;

a, b

= 750 mm; d ≤ 500 mm

d

≤ 500

mm

Figure 12 — Test arrangement for the cruciform bending moment M B and cruciform bending stiffness c ϕ1,MB and c ϕ2,MB of a right angle coupler

7.4.1.3

Test procedure

The test shall be carried out displacement controlled at not more than 2 cm per minute. First carry out three cycles of loading in accordance with 7.2 of EN 12811-3:2002 with limiting values:

±

M

B

1,1 × 1,5

= 0,48 kNm

with M B = 0,8 kNm

27


EN 74-1:2005 (E)

For the secondstage, increase the test load P (i) (for steel tubes at least five tests in the positive and five tests in the negative direction and for aluminium tubes 5 tests in the most unfavourable direction of steel tubes ) until either: a)

test load P (i) reaches a value after which the load cannot be usefully increased; or

b)

coupler component fractures.

Plot the hysterisis curves and record the maximum test load P (i) and the nature of the failure. 7.4.1.4


7.4.1.4.1

Cruciform bending stiffness

The evaluation of stiffness shall be carried out based in principle on 10.10 of EN 12811-3:2002 as follows. For each single test, the stiffness c 1 and c 2 for two areas shall be determined. See Figure 13. c 1 represents the stiffness as the straight line between +

M

B = + 0,48 kNm 1,1 × 1,5

and − M B = − 0,48 kNm 1,1 × 1,5

+

in accordance with Equation (1). The result of the third cycle shall be used to determine the values of ϕ and 1

ϕ1− . 2×

c = 1

M

B

1,1 × 1,5

+

−

ϕ 1 − ϕ 1

=

0,97

(1)

+

− ϕ 1 − ϕ 1

where

+ c represents the stiffness between 2

+

M B 1,1 × 1,5

= + 0,48 kNm and + M B = + 0,8 kNm determined in accordance with Equation (2)

where

c − represents the stiffness between 2

−

M

B

1,1 × 1,5

c+ = 2

= − 0,48 kNm and − M B = − 0,8 kNm determined in accordance with Equation (3).

M B M − B 1,1 × 1,5

ϕ + − ϕ + 2

28

1

=

0,315

ϕ + − ϕ + 2

1

(2)


EN 74-1:2005 (E)

M B M − B 0,315 1,1 × 1,5 − =− c =− 2 − − − ϕ − ϕ ϕ − ϕ − 2

2

1

(3)

1

In the next step, the average values c and c 1

2

of all test results shall be determined in accordance with the

Equations (4) and (5). 1

c

=

1

1

c

n≥10 1 ⋅ ∑ n i =1 c 1,i 1

(4)

  1 n≥5 1 1 m ≥ 5 1  ⋅ ∑ + ⋅ ∑  m j = 1 c −   n i = 1 c+ 2, i 2, j  

= 0,5 ⋅ 

2

(5)

Key M B

cruciform bending moment, see Table 8

c 1, c 2

cruciform bending stiffness of the coupler

Mult

load bearing capacity of the coupler for bending moment

ϕ

angle of rotation

NOTE

This graph represents only the third hysteresis loop.

Figure 13 — Cruciform bending/stiffness curve of a right angle coupler c 1 and c 2 shall not be less than the specified value c ϕ1,MB,c respectively c ϕ2,MB,c in Table 8.

29


EN 74-1:2005 (E)

7.4.1.4.2

Cruciform bending moment

Calculate from the maximum load P (i) the moments M ult(i). Analyse the results M ult(i) statistically in accordance with EN 12811-3 to determine the 5 % quantile M ult,5%. M ult,5% shall not be less than 2*M B = 1,6 kNm, see Table 8. 7.4.2 7.4.2.1

Rotational moment M T and the stiffness c ϕ,MT (RA) Purpose of test

To determine the rotational moment resistance of M T and the stiffness c ϕ,MT to a coupler slipping around a tube. 7.4.2.2

Test arrangements

Set the equipment up in accordance with Figure 14 with the transverse tube located centrally about the basic tube. Hold the ends of the basic tube effectively to give a fixed end condition. Apply the test load P to the coupler in the more unfavourable load direction, which shall be established in initial tests. Provide equipment to measure the change in the angle ϕ , between unloaded and loaded positions of the transverse tube on the side away from the test load P . 7.4.2.3


Apply an initial load P to cause a moment of 10 Nm to establish the zero for displacement measurements. This initial load forms the zero for all displacement measurements and is part of the test loadP .

30


EN 74-1:2005 (E)

Key

1, 2

reference tube RTS1 – RT A

a, b

≤ 750

mm

d

≤ 500

mm

Figure 14 — Test arrangements for rotational moment MT and stiffness c ϕ,MT of a right angle coupler 7.4.2.4

Test procedure

The test load P (i) shall be increased uniformly at a rate not exceeding 0,3 kN per second until the coupler begins to slip. Thereafter, a rate of slip of 2,0 cm per minute shall not be exceeded. First carry out three cycles of loading in accordance with 7.2 of EN 12811-3:2002. Apply a load P to cause a moment M T. On completion of the cyclic loading, the test shall be continued until there is a rotation of 2° in the more unfavourable load direction. Plot a hysterisis curve of measurements for M T and ϕ , see Figure 15. Record the lowest value of M T between |1,0|° and |2,0|° for each specimen.

31


EN 74-1:2005 (E)

7.4.2.5


7.4.2.5.1

Rotational stiffness

For each single test the stiffness c ϕ shall be determined. The value c ϕ shall be evaluated as the straight line between M T = + 0,130 kNm and M T = – 0,130 kNm in accordance with Equation (6). See Figure 15. c = ϕ

2 × 0,130

(6)

ϕ + − ϕ − 1

1

Values from the third cycle shall be used.

Figure 15 — Rotational moment/stiffness curve of a right angle coupler c The average value ϕ shall be determined in accordance with Equation (7). 1

c ϕ

=

n≥5 1 ⋅ ∑ n i =1 cϕ ,i 1

(7)

where

cϕ

shall not be less than the specified value c ϕ,M T,c given in Table 8.

7.4.2.5.2

Rotational moment resistance

The failure ultimate rotational moment resistance M T(i) of each single test shall be determined as the lowest moment between |1,0|° and |2,0|°. Analyse the results of M T(i) statistically in accordance with EN 12811-3 to determine the 5 % quantile M T,5%. This quantile M T,5% may not be less than the specified value M T,c given in Table 8.

32


EN 74-1:2005 (E)

7.4.3 7.4.3.1

Bending moment resistance (SF) Purpose of test

To determine the ultimate bending moment resistance M B of a sleeve coupler. 7.4.3.2

Test arrangement

The test arrangement is shown in Figure 16, with the use of the particular spigot, if required by the manufacturer, described in the product manual. The weakest bending axis of the coupler shall be positioned on the opposite side of the tubes to the test load P . If in doubt as to the weakest axis initial tests should be carried out. Such tests are not part of the main test. Put the supports 500 mm apart and put two points at which the load P acts 125 mm apart, symmetrically to the centre point of the coupler. Provide equipment to limit the rate of displacement to 2,0 mm per minute. 7.4.3.3


Apply an initial load of + 0,1 kN to establish the zero for displacement measurements. This initial load is part of the test load.

Key 1,2

reference tube RTS3

b

≤ 500

mm

Figure 16 — Test arrangements for bending moment M B of a sleeve coupler 7.4.3.4

Test procedure

The test load P (i) shall be increased uniformly at a rate not exceeding 2,4 kN per minute and the rate of displacements shall not exceed 2,0 mm per minute for ∆4. Load displacement curves P (i) = f(∆4) shall be plotted until either: a)

displacement ∆4 reaches a value of 5,0 mm; or

b)

test load P (i) reaches a value for the moment which is twice the specified value (see Table 8); or

c)

test load P (i) reaches a maximum after which it cannot usefully increased.

33


EN 74-1:2005 (E)

The plotted load displacement curves shall include at least one displacement measuring point for every 1,0 kN increase in test load P . Record the maximum test load P (i) and the nature of the failure. 7.4.3.5


Calculate from the maximum test loads P (i) the matching moments M B(i). Analyse the results statistically in accordance with EN 12811-3 to determine the 5 % quantile M B,5%. This quantile may not be less than the specified value M B,c given in Table 8.

7.5

Indentation (RA,SW,PA)

7.5.1

Purpose of test

To determine the local plastic deformation of tubes caused by forces transmitted by a coupler. 7.5.2

Test arrangement

The test arrangement is shown in Figures 17, 18 and 19.

Key 1

reference tube RTS2

2

reference tube RTS1

3


b

≤ 250

mm

m

≤ 500

mm

Figure 17 — Test arrangement for indentation of a right angle coupler and a swivel coupler

34


EN 74-1:2005 (E)

Key 1, 2

reference tube RTS2

3


b

≤ 1

m

≤ 400

000 mm mm

Figure 18 — Test arrangement for indentation of a parallel coupler

Key a, b, c, d measurement lines s

= width of coupler body

l

≥ 20

mm

Figure 19 — Test arrangement for indentation of a right angle coupler, a swivel coupler and a parallel coupler 7.5.3

Test procedure

The coupler shall be subjected to the specified force P ind, given in Table 8 according to its class. The coupler shall remain under the force P ind for at least 10 min. On removal of the coupler from the tubes, the maximum indentation into the tubes caused by a combination of tightening the coupler and the load P ind shall be measured. The original profile recorded for displacements shall be plotted along at least in four lines round the cross section of the tube before loading. Each set of measurements shall be used to plot a profile similar to that shown in Figure 19. The largest value in each case shall be recorded.

35


EN 74-1:2005 (E)

7.5.4

Evaluation of tests results

Express the maximum value of indentation ∆10 for each test. These values shall not be greater to these values given in Table 8.

8

Designation

For each coupler type a designation shall be established following the model given in Table 10. Table 10 — Symbols for designation of couplers conforming to this European Standard Item

Designation

Type of coupler

RA, SW, SF, PA (see Table 1)

Class

A, B, AA, BB (see Table 2)

Method of corrosion protection

C 1, C 2, C 3, according to 8.1 of EN 12811-2:2004 NOTE see 7.1 for comment about electrolytical corrosion protection.

Type of ongoing production inspection

L or M (see Annex B) or X (not in accordance with Annex B)

EXAMPLE EN 74-1 RA BB C2 M The example shown represents the designation of a class BB hot dip galvanized (C2) EN 74-1 right angle coupler made in a factory with type M ongoing production inspection.

9

Marking

Each coupler shall be marked by impressing or embossing on the flap or the body of the coupler and shall be legible after the protective coating has been applied. The height of the characters shall be at least 4,0 mm and their depth shall be at least 0,2 mm. Couplers shall be marked in one or two lines with the f ollowing information, in the sequence given: 

reference to this document, EN 74-1:



registered trademark of the manufacturer;



year of manufacture (last two digits only);



coupler class;



type of ongoing production inspection if provided (see Annex B).

EXAMPLE EN 74 XX 05 BB M

36


EN 74-1:2005 (E)

This example represents a class BB supplementary coupler made in a factory produced by “XX” during 2005 with type M on going production inspection.

10 Test report The test report shall be in accordance with EN 12811-3.

11 Evaluation of test results The evaluation of test results shall be carried out in accordance with EN 12811-3 unless specified differently in this European Standard.

12 Assessment The assessment shall be carried out by a person or organization different from the original designing person or organization. When it has been shown that all evaluated values and other features conform to those specified in this European Standard, a statement shall be made to that effect. NOTE

Requirements for assessment vary between countries.

13 Product manual The manufacturer of a coupler shall produce a set of instructions forming the product manual. This manual shall comprise at least the following: a)

description and a drawing from which the coupler can be identified;

b)

type and class of each coupler;

c)

identity of the assessor and the copy of the statement of the assessment, see Clause 12;

d)

instructions for using and fixing the coupler, for example:



1) use with 48,3 mm diameter tubes and the specification of each tube type to which it is permissible to fix a coupler;



2) for screw couplers, the tightening torque of 50 Nm; for wedge couplers the weight of the hammer (500 g) to be used for tightening until the jarring blow;



3) statement that right angle couplers AA and BB shall be used with an identical model;



4) statement that where required by the manufacturer a sleeve coupler shall be used with a specified spigot pin;

e)

statement about the corrosion protection of the screw nut connection and about maintenance with reference to lubrication;

f)

statement that damaged couplers shall not be used.

37


EN 74-1:2005 (E)

Annex A (normative) Whitworth thread size 1/2 X 12 Tpi

A.1 Nominal values NUT

BOLT Key d = D

= 12,7 mm

d n = Dn = 9,988 mm d m = Dm = 11,344 mm p

= 2,117 mm

F = ƒ

= 1,356 mm

r

= 0,29 mm

z

= 12 (Number of threads per inch) Figure A.1 — Nominal values

38


EN 74-1:2005 (E)

A.2 Tolerances and limiting dimensions after coating BOLT Position h

Position g, e

Position H

Position G

NUT

Key — Bolt (Class 6g) d nom = 12,7 mm

d 2nom = 11,344 mm

d 3nom = 9,988 mm

d max = 12,661 mm

d 2max = 11,305 mm

d 3max = 10,025 mm

d min = 12,368 mm

d 2min = 11,1427 mm

d 3min = 9,634 mm

— Nut (Class 6H) Dnom = 12,7 mm

D2nom = 11,344 mm

D1nom = 9,988 mm

Dmax = free

D2max = 11,559 mm

D1max = 10,38 mm

Dmin = 12,7 mm

D2min = 11,344 mm

D1min = 9,988 mm

Figure A.2 — Tolerances and limiting dimensions after coating

39


EN 74-1:2005 (E)

Annex B (informative) Ongoing production control

B.1 

Manufacture of couplers should be controlled by one of the following inspection methods: Inspection level L

The production quality control is carried out only by a manufacturer approved to either EN ISO 9001 or another appropriate document. 

Inspection level M The production quality control is carried out by the manufacturer itself and is supervised by an independent certification system.

B.2 The internal production quality control should be carried out in accordance with the requirements given in Table B.1. Couplers shall be checked visually and their functioning (e.g. working of the moving parts) should be checked. In addition tests in accordance with Table B.2 should be carried out. In the event of any coupler failing to pass any of the tests specified in Table B.2, the manufacturer should investigate the reason(s) for the failure and implement a solution. B.3 The third party control should normally be carried out twice a year. Generally the following checks should be made: a)

random inspection of the results of the internal production quality control;

b)

random check on material properties;

c)

random check on dimensions and tolerances;

d)

random check on corrosion protection;

e)

testing coupler resistance in accordance with Table B.2.

Table B.1 — Control of materials and components by the manufacturers

Element

Item Property to be checked

If supplied to the coupler manufacturer Per batch

Each coupler component Quality of material such as .the flap, body, nut or rivet

Certificate

Dimensions, tolerances, weight

Certificate

40

EN 10204 3.1.B (certificate of compliance with the order)

EN 10204 3.1.B (certificate of compliance with the order)

If produced by the coupler manufacturer

Additional check Random checks on receipt of material

Random checks on receipt of material

Frequency

--

Minimum 1 ‰ of each coupler type, but not less than 3 coupler components per day


EN 74-1:2005 (E)

Table B.2 — Tests to be carried out Coupler type

RA

Characteristic to be checked

In accordance with clause

Reference tube

Frequency of inspection Internal control

Slipping force

8.2.1

RTS1

1 per every

Failure force

8.2.2

RB

50.000 couplers

Third party control 5 per inspection

(minimum 1 per week) SW

Slipping force

RTS1

1 per every

Failure force

BRB

50.000 couplers

5 per inspection

(minimum 1 per week) PA

SF

NOTE

Slipping force

RTS1

Failure force

RB

Slipping force

RTS1

1 per production run

2 per inspection

1 per production run

2 per inspection

See Table 6 for details of reference tubes and bar.

41


EN 74-1:2005 (E)

Bibliography

[1]

EN 10204, Metallic products — Types of inspection documents

[2]

EN 12810-1, Façade scaffolds made of prefabricated components — Part 1:Products specifications

[3]

EN ISO 9001:2000, Quality management systems — Requirements (ISO 9001:2000)

[4]

ISO 965, ISO general purpose metric screw threads — Tolerance

[5]

ISO 2859, Sampling procedures for inspection by attribute

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BS EN 74-1-2005 False work & scaffolds.pdf

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