hydraulic snubbers

7/22/2019 Hydraulic Snubbers

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1QUIRI Hydromcanique- FRANCE Phone : +33 3 88 04 84 00 Fax : +33 3 88 04 84 01 Email : [email protected]

Ed:03/2014 SNUBBERS

TABLE OF CONTENT

APPLICATIONS

QUIRI HYDRAULIC SNUBBERS

Design of QUIRI snubbers

ValvePainting

Snubber selection criteria

TECHNICAL SPECIFICATIONS

Raw material

Dynamic characteristics

Environment conditions

Stiffness

Permissible load

Life under dynamic stressLarge Bore Technical characteristics

DIMENSIONAL CHARACTERISTICS

Large bore snubber

Small bore snubber

Extensionsfor small bore snubber

Weld-on bracket

SNUBBER DYNAMIC TEST BENCH

Description

Technical characteristic

Optional

Not included

SNUBBER FILLING BENCH

Description

Technical characteristic

Optional

Not included

QUIRI REFERENCES

CERTIFICATES

02

03

05

07

11

12

13

14


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

Ed

:03/2014

SNUBBERSAPPLICATIONS

The snubbers are linear supports designed to limit

unwanted sudden movements of components such

as :

Pipes

Tanks

Control valves

Steam generators

Safety valves

Pumps, motors, etc.

The snubbers enable slow movements due tothermal 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.

In that way, the snubbers provide temporary

additional support to the installation in order toprevent 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

Quiri Hydromcanique 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.

Free movement under the locking speed

Tension

Total stroke

Force after locking

Tension

Legend

j : Mechanical clearance

A: Peak to peak under high frequency

B: Peak to peak under low frequency


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QUIRI HYDRAULIC SNUBBERS

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 (type 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 bedamaged, 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 than 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 oil 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.

CH1 V1 V2 CH2B1 B


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SNUBBERSQUIRI HYDRAULIC SNUBBERS

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.

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 speed without risk to plug the nozzle.

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 bodys 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.

Lockup Valve open Lockup Valve closed Lockup Valve open

Free motion under tensionSnubber under drift speed by

calibrated nozzle (N)Free motion under compression


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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, 15C to 35C(Typically values, others possible on demand)

FNis 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 lockingf < 500N if F

N 30 kN

f < 2.0 % FNif 30 kN < F

N< 200 kN

f < 1.5 % FNif F

N 200 kN

Drift speed after locking,at F

N: 0.1 mm/s to 2.0 mm/s or as requested

Peak-to-peak motion under sinus alternating load FNfrom 3 to 33 Hz

< 4 mm if FN 100 kN

< 5 mm if FN 600 kN

< 6 mm up to FN= 600 kN

Environment conditions

Temperature :For operating temperatures < 0C, please contact us.

Minimum storage temperature : - 30C

Humidity :100 %

External pressure :Service pressure : 1 bar

Accidental pressure : 5 bar

Total dose of radiations :600 kGy

Stiffness

Snubber stiffness is defined according

to the following diagram where :

Peak to Peakthe Total stroke under

alternative load,

and Snubber Stiffnessis :

K= 2 x FN

Peak to Peak

Model

Nominal

load FN

(kN)

Stroke

(mm)

Stiffness*

(kN/mm)

DA1 14100 13

200 11

DA2 30150 23

300 16

DA3 47150 33

300 25

DA4 100150 69

300 47

DA5 200150 124

300 76

*Tolerance on stiffness value : 25%

Mechanical

clearance

Load

Stroke

Peak to Peak

-FN

FN


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SNUBBERSTECHNICAL 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.

Model

Total stroke

(mm)

FN

load level A/B/80C

(kN)

Emergency

load level C/80C

(kN)

Faulted

load level D/150C

(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

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)

Drag force at slow speed, before locking : < 40 kN (DA12)

Lockup velocity : 6 mm/min < LV < 60 mm/min

Drift speed after locking : < 10 mm/min under maximum load

Lost motion : < 1 mm

Theoretic stiffness in tension : > 1200 kN/mm under maximum load (DA12)

Theoretic stiffness in compression : > 1500 kN/mm under maximum load (DA12)

Fluid : silicon oil

Functional temperature : 10C to 60C


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Large bore snubber

Type

Nominal

load

Level B

(kN)

Faulted

load

Level D

(kN)

Stroke

(mm)

A

half

stroke

(mm)

B

(mm)

C1

(mm)

C2

(mm)

D

(mm)

E

(mm)

F

(mm)

R1

(mm)

R2

(mm)

Weight

(kg)DA6-150

320 545150 775

220 75 68 45 43 40 75 75115

DA6-300 300 1136 150

DA7-150600 1020

150 925280 92 92 60 63 60 99 99

240

DA7-300 300 1330 295

DA8-1501100 2000

150 1100330 180 125 90 85 80 125 140

500

DA8-300 300 1603 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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SNUBBERSDIMENSIONAL CHARACTERISTICS

Small bore snubber

Type

Nominal

load

Level B

(kN)

Faulted

load

Level D

(kN)

Stroke

(mm)

A

min

(mm)

A

half

stroke

(mm)

A

max

(mm)

B

(mm)

C

(mm)

D

(mm)

E

(mm)

F

(mm)

R1

(mm)

Weight

(kg)DA1-100

14 24100 435 485 535

102 50 17 20 19 2812

DA1-200 200 618 718 818 17

DA2-15030 49

150 555 630 705115 50 20 25 23 28

23

DA2-300 300 845 995 1145 31

DA3-15047 77

150 545 620 695154 60 25 28 28 32

35

DA3-300 300 795 945 1095 49

DA4-150100 140

150 590 665 740170 70 30 32 30 39

52

DA4-300 300 850 1000 1150 66

DA5-150200 280

150 710 785 860220 105 45 43 40 58

85

DA5-300 300 980 1130 1280 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

Nominal

load

Level B

(kN)

Faulted

load

Level D

(kN)

Stroke

(mm)

A maxi

at half

stroke

(mm)

M

at half

stroke

(mm)

G

(mm)

L

mini

(mm)

L

maxi

(mm)

C

(mm)

D

(mm)

E

(mm)

F1

(mm)

F2

(mm)

R1

(mm)

R2

(mm)

Weight

L mini

(kg)

+ per

50mm

(kg)

DA1-10014 24

1001000

43240 190

54050 17 20 19 13 28 26.5

140.22

DA1-200 200 665 340 19

DA2-15030 49

1501400

57760 200

80050 20 25 23 17 28 32

25.50.34

DA2-300 300 942 450 33.5

DA3-15047 77

1501700

55780 220

112060 25 28 28 19 32 36.5

390.46

DA3-300 300 882 820 53

DA4-150100 140

1502100

592100 250

150070 30 32 30 21 39 41

721.1

DA4-300 300 927 1150 76

DA5-150200 280

1502100

677120 260

1410105 45 43 40 30 58 56

1001.4

DA5-300 300 1022 1060 121

Length of extension available every 50 mm from Lmini

Adjustment 35mm

Rigid struts on demand


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SNUBBERS

Weld-on bracket

Type

A

(mm)

B

(mm)

C

(mm)

D

(mm)

E

(mm)

F

(mm)

G

(mm)

H

(mm)

R

(mm)

Weight

(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

G

C

FF

D

E

H

A

R

B


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SNUBBER DYNAMIC TEST BENCH

SDTB

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

SDTB 300/850T

Hydraulic power unit


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SBF 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

SFB 3000-6


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QUIRI REFERENCES

FRANCE (EDF) :

48 units 900 MW and 1300 MW (6000 snubbers up to 200 KN) - 1980 - 1994

1 unit SUPER PHENIX up to 1300 kN (1000 snubbers) - 1980

90 large bore snubbers 1150 kN - 2004 - 2006

20 large bore snubbers 450T and 850T for the EPRTMFlamanville in France - 2007

Spare snubbers 900 MW - 2007 - 2012

EXPORT :

200 snubbers for PEC (Ansaldo-Nira in Italy) - 1984

2 units 900 MW in South Africa (500 snubbers) - 1985

2 units 900 MW in Korea (1000 snubbers) - 1986

4 units in China (Daya Bay and Ling Ao) (1700 snubbers) - 1988 - 1998

850T large bore snubbers for EPRTMOlkiluoto (Finland) (20 snubbers) - 2005

Spares for 900 MW (Korea) (70 snubbers) - 2005

Spares for 900 MW (South Africa) - 2007 - 2009

230 snubbers up to 2000kN for NPCIL (India) - 2004

40T snubbers for Qinshan plant (China) - 2007

450T snubbers for CZEC (China Chasnupp 2 project) - 2007Snubbers for coal, petrochemical and fossil fuel plants (China) - 2004 - 2012

More than 3000 snubbers for CNPEC, (CPR1000 projects in China) - 2008 - 2012

Large bore snubbers for EPRTMTaishan (China) - 2009

Snubbers for thermal power stations for BHEL (India) - 2009 - 2012

Snubbers for gas-fired and solar power plants (Korea) - 2009 - 2012

570 snubbers for BHAVINI (India) - 2010

Snubbers for Spend fuel cask transfer machine FA3 for SKODA (Czech Republic) - 2010

Snubbers for VVP and RCP lines for EPRTMFlamanville (France) and Taishan (China) - 2010

Snubbers test bench for KEPCO (Korea) - 2010

Large bore snubbers for SG and GMPP for Hainan plant (China) - 2010

450T snubbers for CZEC (China Chasnupp 3&4 projects) - 2011

Large bore snubbers for SG and GMPP for Fangchenggang plant (China) - 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).


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CERTIFICATES


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