hydraulic shock and sway suppressors ( hydraulic … shock suppressors.pdf · hydraulic shock and...

Hydraulic Shock and Sway Suppressors( Hydraulic Snubbers )

Hydraulic Shock and Sway Suppressors (Snubbers)

Hydraulic shock- and sway suppressors Applications PSS hydraulic shock- and sway suppressors are used to prevent damage to appliances, pipework, pressure vessels,

valves and pumps which might otherwise be caused by dynamic forces applied suddenly. These include dynamic

loading occurring during operation (water hammer, pipe bursts or shocks caused by safety-valves blowing off), and on

the other hand by external influences (earthquakes, explosions and wind loads). In addition, the PSS snubbers can be

used as oscillation-dampers for oscillating pipework and plant components, provided the amplitude exceeds 0.5 mm.

By using the snubbers the dynamic displacement is reduced to a minimum. Movements caused by temperature

alteration are not obstructed by the snubbers.

Function On imposition of a dynamic load moving the piston faster than the response velocity preset by PSS, the snubber valve

closes and the snubber absorbs the force. The overflow valve or the bypass valve has the task of limiting the piston

movement to the specified nominal loading.

Construction features PSS snubbers can be installed in any desired position. The fluid level in the snubbers can be easily and reliably

observed from the relative positions of the pistons rods.

PSS snubbers are modular designed. Matching and alterations to suit requirements are very easy to accomplish. This is

how special solutions can be offered so quickly, in accordance with the customer's requirements.

The PSS snubber has two independently-operating pairs of valves, accessible externally. By this means the snubber can

be optimised to the customer's requirements on the test-bench (response velocity, bypass velocity and reaction travel).

Even after installation, adjustment is possible if required. Due to the independently-operating lock-up valves, the PSS

snubbers also have adequate power when working in tension and compression directions at high frequency rates. When

changing direction, the second valve can react before the first valve has returned to its starting position.

The PSS snubbers have only very little frictional and starting resistances, because friction areas are very small. We

placed a high priority on low friction when selecting the sealing materials.

The initial pressure in the system required for tightness is very low. The seals are all made of high quality materials

and have a very long service life.


When the PSS snubbers were designed, the following standards were taken into account:

VGB - Power-Tech guideline R510L

KTA - Nuclear Safety Standards Commission 3205.3

BS 3974, Part 1

ANSI B31.1

MSS SP 58

MSS SP 69

SVDB guidelines

ASME Section III, Sub-section NF

Models available

PSS hydraulic snubbers are available as a standard model, and as a special model designed for low-temperature and

offshore uses.

Standard model

- Housing parts coated with extremely corrosion-resistant zinc-iron coating 10 - 15 m.

- piston rods coated all round with 40 m electroless nickel and the shaft additionally coated with 20 m of hard

chrome.

Special model

- Housing parts of 1.4301 stainless steel and additionally galvanised with 15 m nickel coating.

- piston rods are made of chloride-resistant stainless steel with a 10 m hard chrome coating on the shaft.

Further material combinations and special coatings are available at the customer's request.

Standard settings and test values at room temperature

in accordance with KTA 3205.3 and VGB-R510L:

Starting resistance: Frictional resistance: Response velocity: Bypass velocity: Piston rod travel Sa: Piston rod travel Sb: Temperature: Deflections:

max 2 % of the nominal load (or 300 N for snubbers with a nom. load less or equal 15 kN) max 2 % of the nominal load (or 200 N for snubbers with a nom. load less or equal 10 kN) 3 - 6 mm/s 0.2 - 2.0 mm/s > 0.5 mm (lost motion) < amount + / - 0.02 nominal travel (peak to peak) max. operating temperature 80 C (short-time operating temperature for a duration at max. 3 hours 150 C) max. deflection cross to the bolt axis: 70 max. deflection in the bolt axis: min. 5

with extension

Fig. 200A, 200B, 202 Fig. 201A, 201B, 203 ( with extension )

snubber body with 2 rod eyes, snubber body with 2 rod eyes,1 extension piece

snubber body with 2 rod eyes snubber body with 2 rod eyes1 rear bracket EHS 14 S at the fixpoint 1 rear bracket EHS 14 S at the fixpoint

1 extension piece

snubber body with 2 rod eyes snubber body with 2 rod eyes2 rear brackets, EHS 14 S 2 rear brackets, EHS 14 S

1 extension piece

snubber body with 2 rod eyes snubber body with 2 rod eyes1 rear bracket EHS 14 S at the fixpoint 1 rear bracket EHS 14 S at the fixpoint 1 special dynamic pipe clamp 1 extension piece

1 special dynamic pipe clamp

Option 2:

Option 3:

Option 2:

Option 3:


Option 0:

Option 1:

Option 0:

Option 1:

Option 0

Option 1

Option 2

Option 3

Option 0

Option 1

Option 2

Option 3

Allowable Loads

* = KTA Nuclear Safety Standards Commission 3205.3 ** = ASME Section III, Sub-section NF

Technical Data Fig. 200A / 201A

C L1 L4 A B H D L5 L6 R F S K EHSSize N.load Stroke middle middle min. max. min. max. 40 14 S

kN mm Size127 386 489 719 933 254 576 679 909 743 127 408 505 784 1394 121,0254 599 696 975 1203 145,0127 440 547 840 1837 160,0254 631 738 1031 1646 180,0127 447 609 963 2249 167,5254 638 800 1154 2058 187,5127 471 689 1066 2184 254 662 880 1257 1993 127 510 761 1145 2105 254 700 951 1335 1915 254 742 1036 1442 1818

130

145

177

45 91 71 51,0

140 140 70

157 120 120 60

special strokes on request

45 36,562 30

250 260 240 120 5"

45 2000

L2 middle

32,025 41 56 178

L3

mm

1253 1419 1800 2040


201A,201B 45 200A,200B 201A,201B

68 77 78 117 133

1 x FN 1,5 x FN 1,7 x FNLoad case HZ* Load case HS*Load case H*

178

14 202B 203 1730

Fig. 200A / 201A

3 1/4" 78 2500

2 1/2"

233 180 180 85 4" 121 3000 212

202 3000 250 60 123 95 67,5

49

205,0

H110 80,0 220,0 210 70 141 6" 303 3000 250 275 340 280 140

1 1/2" 13 1500 152 120 65 80 40 70 12 B15 42 106,061 20,0

20 D1100

170 44 G1

32 F1

22 E1

3 1/4

(inches) extension

Cylinder - bore Figure Figuresize with

1 1/2 200A,200B2 1/2 200A,200B

20 1/2 202B

4 200A5 200A

12 202B

8 1/2

24 1/2 202B29 1/2 202B

202B

17 202B

10 202B

35 1/2 202B43 202B

C** Emergency D** Faulted1/4, 1/2, 1 200A 201A 7 10 12

A / B** Normal / Upset

201A,201B 13 20 22

201A 121 182 206 343

6 200A 201A 303 455 515 201A 202 303

203 590 885

2941 2595 203 1200 203 835

1003

203 2470 3705 4199 203 3610 5415 6137 203 5130 7695 8721 203 7510 11265 12767 203 10815 16223 18385 203 16155 24233 27463

special strokes on request

50 57,5

874

1304

30 63,5 65

2 1/2" 45

3 1/4 " 78 2500 177

20" 508,0 1120 134315" 381,0

1078 1304

5" 10" 69615" 381,0 887 1113

254,0

1334 52,3

135 1301525

371716 41,6

47,7929 115210" 254,0 738 961

32,85" 127,0 547 770 1907 37,1

20" 508,0

240

30,732 200

D

kgmm

min.min.mm

StrokeL1 midd.Fig. 200B/201B

min. max.Size


weightS1SFRL6L5L3L2 middlemax.

1 1/2" 1310"

N.loadkN inch

4895" 679505

127,0254,0127,0

641831683874

1500 15

1495

1011 821

2000 40 251065

26,528,6

13,515,0

Technical Data Fig. 200B / 201B

96103

115 105

13545,5 61 2035

Fig. 201B

L2 middle

S1

F

SL3

Fig. 200B

L1 middleL6 L5

S1

F

S

D

R

D

R

C L1 L4 L5 L6 L7 A B H D R F D1Size N.load Stroke middle middle min. max. min. max. 40

kN mm127 464,5 766,5 715,5 3081,5 95 2300254 591,5 893,5 842,5 3008,5 95 2100127 511,5 856,5 821,5 3396,5 125 2500254 702,0 1047,0 948,5 3343,5 125 2320127 555,5 876,5 870,5 3718,5 140 2800254 746,0 1067,0 997,5 3665,5 140 2620127 604,5 966,5 945,5 4107,0 155 3100254 795,0 1157,0 1072,5 4054,0 155 2920

sizes 17" up to 43" on request

120 410 420

374 360

14" 1730 235 194,5 170 170 450 350

350 310

12" 1200 215 173,0 148 148 420 320

303 268

10" 835 225 185,0 160 160 400 320

mm

8,5" 590 196 150,0 156 156 145 80 90,0

100,0

130,0

137,5

360 240

170 90

205 110

220

Fig. 202 / 203 L2 40 middle L3


Technical Data Fig. 202 / 203

www.pipesupp.deE-Mail: [email protected]

Fax 0049 (0)6821 4011-37

Postfach 1142, D-66511 Neunkirchen

our post office adress:

Tel. 0049 (0)6821 4011-0

PSS Pipe Support Systems GmbH International


Gebachstr. 2, D-66538 Neunkirchen

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