4.10)Arch Shaped Self Supporting Trussless Roof Specifications

HINDUSTAN PETROLEUM CORPORATION LIMITED

LONI TERMINAL REVAMPING PROJECT CIVIL WORKS

STANDARD SPECIFICATIONS FOR TRUSSLESS ROOFING FOR LUBE SHED & ENGG. WAREHOUSE AT LONI TERMINAL

STANDARD SPECIFICATION FOR TRUSSLESS ROOFING

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AA: GENERAL MATERIAL SPECIFICATION 1.0)

SCOPE:

This Specification covers 55% aluminum-zinc alloy coated steel sheet in coils and cut length. This product is intended for applications requiring corrosion resistance or heat resistance or both. 2.0)

MATERIAL:

Imported/ India Galvalume sheets with following contents: 55% Aluminum 43.4% Zinc 1.6% Silicon 3.0)

Alloy Coated High Tensile steel

REFERENCE CODE:

ASTM A792/A792M-9a 4.0)

CLASSIFICATION:

The material is available several designations based on the type of base metal used like, 

Commercial steel(CS)

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Forming Steel(FS)

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Drawing steel(DS)

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High temperature steel(HTS)

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Structural steel(SS)

Structural steel is available in two grades namely 340 and 550


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The product is available in several coating masses with coating designations as given below

Minimum Requirements Coating Designation

Triple spot test

Single spot test

Total both sides, g/m2

Total both sides, g/m2

AZM 100

100

85

AZM 110

110

95

AZM 120

120

105

AZM 150

150

130

AZM 165

165

150

AZM 180

180

155

AZM 210

210

180

All coating weight tests have to be performed in accordance with the requirements stated in specification ASTM A924/A924M


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5.0)


CHEMICAL COMPOSITION:

The heat analysis of the base metal shall confirm to the requirements as shown below

6.0)

COATING COMPOSITION:

The 55% aluminum zinc alloy coating composition, by weight, is normally 55% aluminum, 1.6% silicon and the balance zinc. 7.0)

MECHANICAL PROPERTIES:


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The structural steel sheet shall confirm to the mechanical property requirements as given below for different grades.

All tests for mechanical properties shall be conducted in accordance with ASTM standard A924/924M

8.0)

BENDING PROPERTIES:

Structural sheets are commonly bent by cold bending. The suggested minimum inside radii for 90 degree cold bending for structural steels. Coating bend test: For structural steel, the coating bend test inside diameter shall have a relation to the thickness of the specimen as shown below,


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9.0)


DIMENSIONS & PERMIABLE VARIATIONS:

All the dimensions and permeable variations shall comply with the requirements of specification ASTM A924/A924M


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BB: REQUIREMENTS FOR THIS TENDER

1.0)

It is the sole responsibility of the contractor to design the entire building with arch shaped self supported roofs as per relevant IS/International codes and he will be considered as the single window responsible person for arch shaped self supported roofing system.

2.0)

The design of roofing system includes the design of all accessories like fasteners, nuts, bolts, clamps, hangers etc all complete.

3.0)

Contractor also has to prepare the drawings in autocad of the entire structure including trussless roofing system and submit them along with design calculation to HPCL for approval. It will take 15 days to get it approved since HPCL has to get it vetted by our consultant.

4.0)

The steel sheet shall be 3’-0” (914MM) width (tolerance +/- 2 mm) which shall be curved and molded at site using mechanical press and dies to the desired curves and shape to form 2’-0” (610 MM) wide interlocking panels (indicative drawing attached). These panels shall be erected in position and their seams shall be interlocked and pressed to close the seam forming a water tight joint.

5.0)

Minor colour chipping/ scratching should be rectified by applying Epo xy lacquer

6.0)

The supply for the installation of fasteners at the end will be there in the scope of work of contractor.

7.0)

The installation should be done by mechanized methods. The contractor has to mobilize required No. of Hydra for transportation of sheets and cranes for the erection of seamed sheets.

8.0)

Adequate precautions shall be taken by t he contractor during the installation process for the safety of their workers. Safety belts, helmets and other safety equipments for the execution of job must be used, wherever required. Works in height panel installation process shall not be carr ied out in case of wind velocity at site location is above 22 K.M. per hour.

9.0)

The contractor shall make provisions for the hangers and clamps etc. for providing light fixtures in the roof, wherever required.


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HINDUSTAN PETROLEUM CORPORATION LIMITED 


TENSILE STRENGTH:

Grade 350 

COATING:

Coating Mass of AZ-150 of the shade to be decided by HPCL- (150 gm/m2-both sides) 

ORGANIC PAINT COATING SYSTEM:

Regular modified polyester with 20 micron of top coat over internal lubricant, suitable for roll 5 micron of primer. forming. 7 micron of back coat over 5 micron primer.

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THICKNESS:

i) Basic material the thickness (BMT)= 1.00 MM ii) Total Coated thickness (TCT) = 1.09 MM with a tolerance of -0/0.02 mm. 

TESTING OF MATERIAL:

The sheets shall be tested at the cost of the contractor before use to check the following: i) ii) iii) iv)

Thickness Tensile Strength Contents of Aluminium, Zinc and Silicon. Water tightness

All the test mentioned in ASTM codes like the tests given below has to be done by the contractor and the same shall be vetted by any of the HPCL approved third party agency which shall be submitted to HPCL’s approval prior to the installation of the roofing system.


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PROPERTY

TOP COAT THICKNESS (MICRONS) GLOSS AT 60 DEGREE PENCIL HARDNESS TEST IMPACT TEST (IN JOULES) SALT SPRAY TEST ADHESION TEST ( CROSS - HATCH ) ERICHSEN CUPPING TEST HUMIDITY TEST T-BEND TEST (T=SUBSTRATE THICKNESS) SOLVENT RUB TEST (MEK(methyl ethyl ketone) DOUBLE RUB) CHEMICAL RESI. ( 5% NAOH, 5% H2SO4 ) MAX OPERATING TEMP.

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TEST METHOD

REGULAR MODIFIED PLASTER

ECCA T1-1995

25

ECCA T2-1995

30-90 %

ECCA T4-1995

H-2H

ECCA T5-1995

10 J

ECCA T8-1996

750 HRS

NCCA II - 5

100%

ECCA T6

7 MM

NCCA III - 6

1000 HRS

ECCA T-7

2T(NO TAPE LOSS)

ECCA T-11

> 50 RUBS

ECCA T 18-1995

NO BLISTERING, DISCOULERATION & SOFTENING OF PAINT FILM

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120 DEGREE C

STANDARDS:

The agency shall be ISO certified and shall follow International Standards for Galvalume sheet roofing.


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HINDUSTAN PETROLEUM CORPORATION LIMITED 


FIXTURES:

The fixtures like fasteners, turbo ventilators and translucent sheets shall be designed to suit the requirements of HPCL. 

SYNCHRONISATION:



The contractor will be considered as the single responsible person for the roofing system in all respects including warranty and it is his sole responsibility to remain in touch with the agency doing fixing of Galvalume sheet for proper liaisoning.

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WARRANTY & MAINTANANCE:

The contractor has to submit the following guarantee/warranty certificate to HPCL before starting the work and he alone will be considered responsible for this during the entire warrantee period. i) Onsite warranty for one year after completion of work, which shall include free replacement and repair of each and every part within 72 hours of reporting by the concerned authority ii) Annual maintenance contract for a period of 1 years after completion which shall include: a.

Checking and fixing of the fasteners to ensure that these are in order.

b.

To check the seaming in between the sheets.

c.

To repair the cracks wherever required.

d.

Coats of epoxy wherever required.

Besides above The entire sheeting work shall be checked every quarter and a certificate shall be issued by the sheeting contractor that the Galvalume sheets installed by them are in order. Also sheets shall be cleaned with jet of water and detergent (if required), every six months to remove dirt/ dust over them.


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4.10)Arch Shaped Self Supporting Trussless Roof Specifications

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