Hydraulic Snubbers

SNUBBERS

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TABLE OF CONTENT

APPLICATIONS

02

QUIRI HYDRAULIC SNUBBERS

03

Design of QUIRI snubbers Valve Painting Snubber selection criteria TECHNICAL SPECIFICATIONS

05

Raw material Dynamic characteristics Environment conditions Stiffness Permissible load Life under dynamic stress Large Bore Technical characteristics DIMENSIONAL CHARACTERISTICS

07

Large bore snubber Small bore snubber Extensions for small bore snubber Weld-on bracket SNUBBER DYNAMIC TEST BENCH

11

Description Technical characteristic Optional Not included SNUBBER FILLING BENCH

12

Description Technical characteristic Optional Not included QUIRI REFERENCES

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CERTIFICATES

14

QUIRI Hydromécanique - FRANCE Phone : +33 3 88 04 84 00 Fax : +33 3 88 04 84 01 Email : [email protected]

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APPLICATIONS

The snubbers are linear supports designed to limit unwanted sudden movements of components such as :

Free movement under the locking speed

• Pipes • Tanks • Control valves • Steam generators • Safety valves • Pumps, motors, etc.

Tension

The snubbers enable slow movements due to thermal dilatation in both directions and oppose only low resistance to such movements. But when the movement speed leads to dynamic displacement that are harmful to the installation, the snubbers are immediately locked at the desired speed and support the dynamic force by transferring it to the fixed structure. Once the disturbance has passed, the device returns to its initial state and enables slow movements once again.

Total stroke

Force after locking

In that way, the snubbers provide temporary additional support to the installation in order to prevent if from entering into resonance, thereby minimising the risk of breaking due to vibrations. The snubbers therefore prevent damage due to: • Earthquakes • Water hammer effects • Violent thrusts due to safety valve discharge of breaks in piping • Wind • Other similar disturbances

Tension

Legend j : Mechanical clearance A : Peak to peak under high frequency B : Peak to peak under low frequency

Quiri Hydromécanique reserves the right to amend the dimensional and technical characteristics of its products without giving prior notice. The contents of photographs, diagrams and illustrations are non-contractual. 2

QUIRI Hydromécanique FRANCE

Phone : +33 3 88 04 84 00 Fax : +33 3 88 04 84 01 Email : [email protected]

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SNUBBERS QUIRI HYDRAULIC SNUBBERS

CH1

V1

B1

B

V2

CH2

Design of QUIRI Snubbers All raw materials are forged or rolled steel. This technology reduce the risk of porosity in comparison with molded and welded steel. QUIRI snubbers are designed to withstand the hot, humid and irradiated atmospheres prevalent in nuclear and thermal power plants. They are designed to last 60 years with minimal maintenance. Valves V1 and V2 allow a limited flow of fluid between chambers CH1 and CH2. The drift speed after locking is generally set to 0.1 mm/s to 2 mm/s or as requested. The movement is required if a pipe subject to thermal dilatation simultaneously sustains a sudden thrust leading to the locking of the device. That case of operating is the most frequent (t ype A function). When complete blocking is desired, e.g. in the case of a valve reaction, valve V1 is without restriction (type B function). The system of rod volume compensation and fluid thermal dilation is inside the snubber and does not need any servicing. It is located in the piston (chamber B1), between the 2 chambers CH1 and CH2. This technology is used in all QUIRI snubbers for more than 25 years. The compensation tank constituted by the hollow piston and the metal bellows (B), forms simultaneously reserve of oil and provides an internal permanent pressurisation. Its internal position allows a symmetrical and compact construction, without external element destabilising the snubber and at risk to be damaged, so facilitating on-site installation of snubbers. Metal compensation bellows, subject to 100% tightness testing. The tightness material will be on base of Viton® (used by Quiri on the snubber for more t han 25 years); the wear ring material will be on base of polyester resin and of texture thin of polyester. Irradiation care test shows that the snubber remains functional after 60 Mrd of radiation. Perfect fluid filling by vacuum, to remove air from oil and so insuring better lifetime expectancy for fluid, lockup valves, nozzles and tightness materials. This filling technology allows lower values than obtained by traditional filling and higher stiffness. The life expectancy of these snubbers is 60 years (outcome from our manufacturing experience for more than 25 years). Perfect fluid filling by vacuum, to remove air of o il and so insuring better lifetime expectancy for fluid, valves, nozzles and tightness materials. This filling technology increases the stiffness of the snubber and allows peak to peak values lower than obtained by traditional filling.


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QUIRI HYDRAULIC SNUBBERS

Valve Lockup valve defining the lockup velocity are tested one by one in our factory. Nozzles are designed and sized to be independent from the fluid viscosity and temperature. QUIRI is using a Self Cleaning Lockup Valve. The self cleaning lockup valve (SCLV) ensures 2 functions : blocking and drift. The integration of both function is made by machining a «V» shape slit on the working area of the valve so that : • The SCLV is never totally closed to assure the decompression • After drift trough the «V» shape slit, the pressure will decrease and allows the opening of the valve. This process ensures the self cleaning of the valve comparing to a classic nozzle which would be definitively stopped in case of impurity contains in the oil With this technology, we can realize very low drift s peed without risk to plug the nozzle. Lockup Valve open

Lockup Valve closed

Lockup Valve open

Free motion under tension

Snubber under drift speed by calibrated nozzle (N)

Free motion under compression

Painting The painting applied on all our snubbers is decontaminate type and ensures a corrosion protection for the snubber life expectancy. It allows a resistance of more than 200 hours on normalized salt spray test. The life expectancy of these snubbers is 60 years (outcome from our manufacturing experience for more than 25 years). Nickel coatings are available on demand.

Snubber selection criteria Dynamic load : At the nominal load FN, Check that the snubber is capable of handling dynamic forces during normal operation and/or operating basis earthquake conditions (level A/B). In the upset situation, check that the snubber is capable of handling the forces expected at level D, safe shutdown earthquakes.

Stroke : The selected snubber must be able to make the fixing points cover the maximum travel between the assembly position and extreme operating position. Users should select the snubber with a minimum margin of 10 mm is available in the assembly position A travel indicator on the body’s snubber allows to verify the good operation position.

Available space : Make sure that when the snubber is in place, the expected movements are possible with the minimum margins. Add an extension if the space available is larger than travel capability of the snubber (page 9). The snubber may be assembled in either direction. Make sure that the spherical bearings can move freely, in the assembly position and in the operating position. 4



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TECHNICAL SPECIFICATIONS

Raw materials Forged and tempered stainless steel rod with chemical nickel coating or chrominium Forged and tempered stainless steel eye ends Body an internal parts in high quality carbon steel

Dynamic characteristics at room temperature, 15°C to 35°C (Typically values, others possible on demand) FN is the Nominal load of the snubber Operating from 0.5 up to 100 Hz with symmetrical compensation system and internal pressurizing.

Locking speed : 2 mm/s to 10 mm/s or as requested

Drag force at slow speeds, before locking f < 500N if f < 2.0 % FN if f < 1.5 % FN if

FN ≤ 30 kN 30 kN < FN < 200 kN FN ≥ 200 kN Drift speed after locking , at FN : 0.1 mm/s to 2.0 mm/s or as requested

Peak-to-peak motion under sinus alternating load F N from 3 to 33 Hz < 4 mm if < 5 mm if < 6 mm up to

FN ≤ 100 kN FN ≤ 600 kN FN = 600 kN

Environment conditions Temperature : For operating temperatures < 0°C, please contact us. Minimum storage temperature : - 30°C Humidity : 100 %

External pressure : Service pressure Accidental pressure

: 1 bar : 5 bar : 600 kGy

Total dose of radiations

Load

Stiffness Snubber stiffness is defined according to the following diagram where :

FN Mechanical clearance

Stroke

Peak to Peak the Total stroke under alternative load, and Snubber Stiffness is : K=

2 x FN

-FN

Peak to Peak

Model

Nominal load FN (kN)

DA1

14

DA2

30

DA3

47

DA4

100

DA5

200

Stroke (mm)

Stiffness* (kN/mm)

100

13

200

11

150

23

300

16

150

33

300

25

150

69

300

47

150

124

300

76

Peak to Peak *Tolerance on stiffness value : ± 25%


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TECHNICAL SPECIFICATIONS

Permissible load in kN The permissible load in terms of dynamic stress in the table below has been calculated in accordance with RCCM code vol. H level S1 or ASME code Section III and is valid for snubbers and fastening accessories – weld-on brackets, pins, extensions. Total stroke (mm)

FN load level A/B/80°C (kN)

Emergency load level C/80°C (kN)

Faulted load level D/150°C (kN)

DA1

100, 200

14

18

24

DA2

150, 300

30

39

49

DA3

150, 300

47

62

77

DA4

150, 300

100

133

140

DA5

150, 300

200

266

280

DA6

150, 300

320

425

545

DA7

150, 300

600

798

1020

DA8

150, 300

1100

1463

2000

DA9

120

-

-

3500

DA10

100

-

-

4500

DA11

100

-

-

6500

DA12

100

-

-

8500

Model

Load definition : Normal/Disturbed - Level A/B : Nominal load (FN) including dynamic stress due to normal operation and operating basis earthquakes. Emergency : Level C : dynamic loads except normal functionning as weel as the safety earthquakes. Faulted : Level D : dynamic loads in accidental situations, including safe shutdown earthquakes (SSE). The snubbers should undergo verification as a minimum after such an event.

Life under dynamic stress The snubbers may be subject to the total dynamic loads below, without any adverse effect on operating, at temperature less than 80° C. Load (in % FN )

Number of cycles

10 %

5 x 106

50 %

106

100 % (level A/B)

105

133 % (level C)

103

(level D)

102

Large Bore - Technical characteristics (Typically values, others possible on demand) • • • • • • • •

6

Drag force at slow speed, before locking Lockup velocity Drift speed after locking Lost motion Theoretic stiffness in tension Theoretic stiffness in compression Fluid Functional temperature


: < 40 kN (DA12) : 6 mm/min < LV < 60 mm/min : < 10 mm/min under maximum load : < 1 mm : > 1200 kN/mm under maximum load (DA12) : > 1500 kN/mm under maximum load (DA12) : silicon oil : 10°C to 60°C


SNUBBERS

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DIMENSIONAL CHARACTERISTICS

Large bore snubber

Type

DA6-150

Nominal load Level B (kN)

Faulted load Level D (kN)

320

545

DA6-300 DA7-150

600

1100

(mm)

A half stroke (mm)

150

775

300

1136

150

925

1020

DA7-300 DA8-150

Stroke

C1

C2

ØD

E

F

R1

R2

Weight

(mm)

(mm)

(mm)

(mm)

(mm)

(mm)

(mm)

(mm)

(kg)

220

75

68

45

43

40

75

75

115 150 240 280

300

1330

150

1100

2000

DA8-300

ØB

1603

92

60

63

60

99

99 295 500

330 300

92

180

125

90

85

80

125

140 600

DA9-120

-

3500

120

1200

620

170

170

140

90

80

240

225

1200

DA10-100

-

4500

100

1080

520

190

180

140

90

80

200

205

1000

DA11-100

-

6500

100

1320

670

210

550

220

175

160

340

260

2000

DA12-100

-

8500

100

1380

750

230

550

220

175

160

340

305

2400

TECHNICAL SPECIFICATIONS : see pages 5 - 6 Other load, stroke or characteristic on demand - Brackets & clamps with axis on demand.


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Small bore snubber

Type

DA1-100



14

24

DA1-200 DA2-150

30

47

100

DA5-300

200

ØB

C

ØD

E

F

R1

Weight

(mm)

(mm)

(mm)

(mm)

(mm)

(mm)

(mm)

(mm)

(kg)

100

435

485

535 102

50

17

20

19

28

200

618

718

818

150

555

630

705

12 17 23 115

300

845

995

1145

150

545

620

695

300

795

945

1095

150

590

665

740

850

1000

1150

150

710

785

860

280 980

1130

25

23

28

60

25

28

28

32 49 52

70

30

32

30

39 66 85

220 300

20

35

170 300

50

31 154

140

DA4-300 DA5-150

A max

(mm)

A half stroke (mm)

77

DA3-300 DA4-150

A min

49

DA2-300 DA3-150

Stroke

105

45

43

40

1280

58 106

TECHNICAL SPECIFICATIONS : see pages 5 - 6 Other load, stroke or characteristic on demand - Brackets & clamps with axis on demand.

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Extension with adjustable rear eye for small bore snubber

Type

DA1-100



14

24

49

DA4-150 DA4-300 DA5-150 DA5-300

(mm)

(mm)

(mm)

(mm)

(mm)

(mm)

40

190

50

17

20

19

13

28

26.5

F1

F2

R1

L mini

25.5 20

25

23

17

28

32 39

60

25

28

28

19

32

36.5

820

72 70

30

32

30

21

39

41

1150

1.1 76

1410 260

0.46 53

1500

120

0.34 33.5

1120

677

0.22 19

450

250

(kg)

+ per 50mm (kg)

14

50

220

Weight

R2

800 200

927

1022

E

340

100

2100

ØD

540

592

150 300

(mm)

80

2100

280

(mm)

882

300 200

(mm)

557

150 140

(mm)

60

1700 300

100

C

942

150

DA3-300

L maxi

577 1400

77

L mini

665

300 47

ØG

432

150 30

M at half stroke (mm)

1000 200

DA2-300 DA3-150

(mm)

A maxi at half stroke (mm)

100

DA1-200 DA2-150

Stroke

100 105

45

43

40

30

58

56

1060

1.4 121

Length of extension available every 50 mm fr om Lmini Adjustment ± 35mm Rigid struts on demand


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Weld-on bracket

G C F

F

R

D ø

H

E

A

B

A

B

C

øD

E

F

G

H

R

Weight

(mm)

(mm)

(mm)

(mm)

(mm)

(mm)

(mm)

(mm)

(mm)

(kg)

DA1

60

50

28

17

12

3

68

44

20

0.8

DA2

80

60

32

20

12

3

78

44

22.5

1.2

DA3

100

70

38

25

14

4.5

88

50

27.5

2

DA4

130

90

42

30

17

4.5

108

62

32.5

4.5

DA5

150

110

56

45

20

6

128

85

47.5

8.7

DA6

160

120

58

45

20

7

138

90

55

11.2

Type

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SDTB

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SNUBBER DYNAMIC TEST BENCH

SDTB 300/850T

Description The SDTB allows to verify the snubbers performance according to the whole acceptance criteria, identical to the QUIRI factory tests. The snubber test is automatic ; the report is printed with all characteristics and the acceptability of this snubber.

Technical characteristics Model

Maximal dynamic load (Tons)

Maximal static load (Tons)

Maximal frequency (Hz)

SDTB 10T

10

10

10

SDTB 50T

50

50

5

SDTB 300T/850T

300

850

1

Criteria tested of snubber : • Total stroke • Drag force in tension and compression on the whole stroke • Lockup velocity in compression • Drift speed in compression • Peak to peak displacement • Lost motion

Optional • 50T force sensor to increase accuracy of the lost motion measure • Accessories (pins, brackets) to fix snubbers • Technical training by QUIRI technician

Not included • Crane to lift snubbers

Hydraulic power unit


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SBF 3000-6 SNUBBER FILLING BENCH

SFB 3000-6

Description To ensure the optimal performance of snubbers, the perfect fluid filling by vacuum is necessary to remove air of oil and so insuring better lifetime expectancy for fluid, valves, nozzles and tightness of equipment. This filling technology is the only way that allows to have the optimal oil volume inside snubbers and peak to peak values in conformity with the QUIRI factory setting.

Technical characteristics • • • • • • •

Maximal unit mass of snubber : 500 kg (total 3000 Kg) Number of filling station :6 Oil tank capacity : 185 l (for one tank, second tank optional) Vacuum pump with pressure gauge Waste oil chamber to protect the vacuum pump Manual oil pump with volume control to adjust the snubber filling 6 masses to maintain the rod out when snubber is in vacuum

Optional • • • •

Supplementary tank Snubber spare plugs Oil Technical training by QUIRI technician

Not included • Crane to lift snubbers

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QUIRI REFERENCES

FRANCE (EDF) : 48 units 900 MW and 1300 MW (6000 snubbers up to 200 KN) 1 unit SUPER PHENIX up to 1300 kN (1000 snubbers) 90 large bore snubbers 1150 kN 20 large bore snubbers 450T and 850T for the EPRTM Flamanville in France Spare snubbers 900 MW

- 1980 - 1994 - 1980 - 2004 - 2006 - 2007 - 2007 - 2012

EXPORT : 200 snubbers for PEC (Ansaldo-Nira in Italy) 2 units 900 MW in South Africa (500 snubbers) 2 units 900 MW in Korea (1000 snubbers) 4 units in China (Daya Bay and Ling Ao) (1700 snubbers) 850T large bore snubbers for EPRTM Olkiluoto (Finland) (20 snubbers) Spares for 900 MW (Korea) (70 snubbers) Spares for 900 MW (South Africa) 230 snubbers up to 2000kN for NPCIL (India) 40T snubbers for Qinshan plant (China) 450T snubbers for CZEC (China Chasnupp 2 project) Snubbers for coal, petrochemical and fossil fuel plants (China) More than 3000 snubbers for CNPEC, (CPR1000 projects in China) Large bore snubbers for EPR TM Taishan (China) Snubbers for thermal power stations for BHEL (India) Snubbers for gas-fired and solar power plants (Korea) 570 snubbers for BHAVINI (India) Snubbers for Spend fuel cask transfer machine FA3 for SKODA (Czech Republic) Snubbers for VVP and RCP lines for EPRTM Flamanville (France) and Taishan (China) Snubbers test bench for KEPCO (Korea) Large bore snubbers for SG and GMPP for Hainan plant (China) 450T snubbers for CZEC (China Chasnupp 3&4 projects) Large bore snubbers for SG and GMPP for Fangchenggang plant (China)

- 1988

- 2007

- 2004 - 2008 - 2009 - 2009

- 1984 - 1985 - 1986 - 1998 - 2005 - 2005 - 2009 - 2004 - 2007 - 2007 - 2012 - 2012 - 2009 - 2012 - 2012 - 2010 - 2010 - 2010 - 2010 - 2010 - 2011 - 2012

OTHERS : 65 snubbers up to 750 kN for the nuclear steam supply system of French aircraft carrier Charles de Gaulle - 1994

In total QUIRI supplied more than 15000 snubbers in nuclear industry (from 6 kN to 8500 kN). QUIRI Hydromécanique - FRANCE Phone : +33 3 88 04 84 00 Fax : +33 3 88 04 84 01 Email : [email protected]

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CERTIFICATES

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Hydraulic Snubbers

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