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HYDRAULIC SNUBBERS

Most hydraulic snubbers have a piston which is relatively unconstrained in
motion at low displacement rates. At high displacement rates the piston “locks
up”, that is, the force required to move the piston increases substantially,
usually as a result of the closing of a valve.


TYPES & SIZES

Guide
Fig. 510AD
Fig. 511AD
Fig. 2100


TECHNICAL INFORMATION

Hydraulic Snubbers
Considering All Movement in Pipe Support Design
Comparative Corrosion Resistance Guide
Snubbers: A General Overview
Vibration in a Piping System
Suitability of Snubbers for Various Applications


INSTALLATION & MAINTENANCE

Hydrualic Snubbers Installation & Maintenance Guide


REQUEST A QUOTE









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12,500 lb. Load Hydraulic Snubber and 24 Alloy Clamp Assembly

Hydraulic Snubbers Designed for an LNG Facility in Texas

Hydraulic Snubbers Designed for LLDPE Chemical Plant

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Hydraulic Snubber Designed for a Gas Turbine in a Natural Gas-Fired Combined
Cycle Generating Power Plant

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PIPE SUPPORT FIELD SERVICE: PROBLEM RESOLUTION



HOW TO INSPECT A HYDRAULIC SNUBBER



SHOCK CONTROL, RESTRAINT, AND SUPPORT DEVICES WEBINAR



See More Videos



What is the criteria to choose a mechanical or a hydraulic snubber?

Both snubbers function similarly. One thing to consider would be the
environment. If the environment is real dirty, the mechanical ...Continue
Reading

What is the criteria required to order a mechanical or hydraulic snubber?

Please specify figure number,cylinder size, stroke, load, cold and hot piston
settings, and piston endoption when ordering a mechanical or ...Continue Reading

What is a hydraulic snubber?

A hydraulic snubber is a device that permits pipe deflection under normal
operating conditions, but when subjected to an impulse ...Continue Reading

Is there a difference for drag force for hydraulic and mechanical snubber?

There is little difference in the initial dragforce associated with mechanical
and hydraulic snubbers. Basically, both styles are designed to ...Continue
Reading

How does the snubber lock immediately during a transient load?

When the velocity of the piston reaches a certain value (about 8in/min),the
hydraulic valve will shut off and the entire ...Continue Reading

How does a hydraulic snubber work?

The basic working principal behind a hydraulic snubber is that under
slow(normal) speeds, a piston moves within a hydraulic reservoir ...Continue
Reading

How do you adjust a snubber?

Snubbers can be adjusted by either changing the initial position of the
telescoping cylinder or by using (where available) the ...Continue Reading

Can a hydraulic snubber handle more load than a mechanical snubber?

Hydraulic snubbers and mechanical snubbers can take the same loads if they are
the same size snubber. It depends upon ...Continue Reading


More FAQs…




GENERAL DIMENSIONS & SPECIFICATIONS





 * Snubbers Guide
 * Fig 510AD & 511AD
 * Fig 2100
 * Request a Quote

Download Anchor / Darling Catalog

HYDRAULIC SNUBBERS GUIDE

The style “AD” Hydraulic Shock Arrestor is a manifold design hydraulic component
consisting of a high pressure main cylinder, a flow control section which
contains dual stage velocity sensitive poppet valves, and a spring energize
reservoir.



Application:
For use on piping systems or equipment when unrestrained thermal movement must
be allowed, but which must be restrained during impulsive or cyclic disturbance.
The unit is not effective against low amplitude, high frequency movement. The
preferred usage with standard settings is to prevent destructive results due to
earthquakes, flow transients, or wind load. Special settings are available to
absorb the continuous thrust resulting from safety valve blow-off or pipe
rupture.

Size Range:
PTP offers seven sizes with cylinder bores of 1 1/2 to 8 inches. These units
have a normal load range of 3,000 lbs. to 130,000 lbs. All are made to include
reservoirs in 6, 12, or 18 inch strokes, except the 1 1/2 inch size. The 1 1/2
inch size is offered only in 6 & 12 inch strokes only. Snubbers, as they are
sometimes referred to, are available with remote reservoirs.

Size Selection:
The selection of size depends on the anticipated force and thermal movement of
the protected piping or equipment. It is recommended that the selected cylinder
stroke be a minimum of the anticipated thermal movement, plus 20%.

Basic Operation:
The piston rod is free to move in either direction with no restrictions to the
fluid flow for all piston velocities up to the activation velocity. At
activation velocity the poppet valve, internal to the snubber, closes. Closure
of the poppet in either tension or compression greatly reduces the fluid flow
through grooves in the poppet at rated design capacity of the unit is termed the
“ bleed rate”. When the applied velocity of the unit becomes zero the poppet
valve opens once again, allowing free piston movement.

Standard Design Features:
– Piping and/or equipment movement is controlled by tamperproof dual stage flow
control poppets designed with self-cleaning orifices.
– Furnished as a complete, compact and efficient unit, ready for immediate use.
– Manifold configuration requiring no external piping.
– Spherical, self-aligning ball bushings allow for ±5º of angular motion or
misalignment.
– Stable premium grade, antiwear hydraulic fluid.
– Pressurized hydraulic reservoir allows mounting in any spatial orientation.
– Virtually no resistance to normal thermal movements of the piping.
– Large restraining forces compared to size.
– Functions in restraining tension and compression loads.
– Designed for continuous operation up to 200°F with brief transients to a
maximum of 300°F.
– Stroke position is measured from a machined groove located at the piston rod
wrench flats.
– Fluid Level in the unit, thereby eliminating estimate of reserve fluid level.

Optional Design Features:
– Remote Reservoir Mounting
– The snubber’s pressurized reservoir can be remotely mounted for inaccessible
locations.
– Integral Relief Valve- A non-adjustable valve, which is factory preset at
133%, or 200% of rated load.
– Protective Boot- Installed over piston rod for protection against corrosive or
outdoor environments.
– Rigid Stud Application- When no thermal growth is anticipated after lock-up,
an optional poppet valve, without bleed, can be furnished. Must be ordered with
optional integral relief valve.



Factory Pre-set:
The units are shipped from the factory complete, tested, reservoir filled to
capacity and piston rod preset to mate with pin to pin installation dimension.
To determine factory pre-set dimension perform the following calculations.

 

HYDRAULIC SNUBBERS
In addition to the mechanical equipment described in this brochure,
Anchor/Darling Enterprises also offers a complete line of hydraulic snubbers.
• hydrA/Damp — Our advanced design, corrosion resistant hydraulic snubber, for
superior performance within many environments.
• B-P Style — Our well-established (formerly Bergen-Paterson) manifold design
hydraulic snubber, eliminates external tubing and its pressurized reservoir
allows installation in any spatial orientation.
• Non-Nuclear — Our commercial snubber design, for use within
fossil/co-gen/petro-chernical plants that require proven performance at
economical prices.
For additional information on any of our hydraulic or mechanical snubbers,
contact the regional office nearest you.

 



Download Fig. 510AD and Fig. 511AD PDF

FIG 510AD SHORT STRUT & 511AD ADJUSTABLE STRUT HYDRAULIC SNUBBERS

  

ORDERING: Specify figure number, description, cylinder size, stroke, load,
thermal movement, overall length, and piston end option. If a pipe clamp is
required, please specify nominal pipe size or special O.D., pipe temperature,
and any additional option features (i.e. integral relief valve or remote
reservoir mounting) or special settings required.

FIG. 510AD – SHORT STRUT HYDRAULIC SNUBBER

Cylinder Approx. Weight (1) H Min.
(2) P-P Min. (2) Load Rating (KIPS) A B D D1 E G L M W1 S BB Size Stroke 1   1/2
6 35 16 21 3 2 3/4 2   1/2 2   3/4 3 1   1/16 1   1/4 5 2 3/4 0.656 12 42 22 27
18 50 28 33 2   1/2 6 70 16   1/2 23   1/4 10 2   1/2 1 3 3   1/2 3   3/4 1
  1/2 1   3/4 6 3 1 0.875 12 83 22   1/2 29   1/4 18 96 28   1/2 35   1/4 3 1/4
6 125 17   3/8 27   1/8 20 4 1   1/2 5 4   3/4 5   1/2 2 1/2 2   1/4 7   3/8 4
  1/4 1   1/2 1.312 12 145 23   3/8 33   1/8 18 165 29   3/8 39   1/8 4 6 155 17
  3/4 28   1/2 30 4 1   1/2 5 4   3/4 6   1/2 2   1/2 2   1/2 8   1/2 4   1/4 1
  1/2 1.312 12 180 23   3/4 34   1/2 18 205 29   3/4 40   1/2 5 6 255 18   1/4
31   3/4 50 5   1/2 2 7 6 8 3   1/2 3   1/4 10   1/4 5   1/2 1   7/8 1.75 12 290
24   1/4 37   3/4 18 325 30   1/4 43   3/4 6 6 410 19   1/2 33   3/4 70 6 2
  1/4 7 6   1/2 8   1/2 4 3   3/4 11   7/8 5   3/4 2   1/4 1.968 12 465 25   1/2
39   3/4 18 520 31   1/2 45   3/4 8 6 805 21   3/16 41   7/16 130 8   1/2 3 10
10 12   1/2 5   1/2 4   3/4 16 7   3/4 2   7/8 2.625 12 890 27   3/16 47   7/16
18 975 33   3/16 53   7/16

FIG. 511AD – ADJUSTABLE STRUT HYDRAULIC SNUBBER

CYLINDER APPROX. WEIGHT (1) P-P F W MIN. SIZE STROKE MIN. (4) MAX. 1   1/2 6 40
32   3/4 100 6   1/4 7   1/2 12 47 38   3/4 100 18 54 44   3/4 100 2   1/2 6 75
36   1/4 120 7   1/4 8   3/4 12 90 42   1/4 120 18 105 48   1/4 120 3   1/4 6
130 41   5/8 120 9   1/2 9   1/4 12 150 47   5/8 120 18 170 53   5/8 120 4 6 200
44   1/8 120 10   1/8 9   3/4 12 225 50   1/8 120 18 250 56   1/8 120 5 6 330 49
  1/2 120 12   1/2 10   3/4 12 365 55   1/2 120 18 400 61   1/2 120 6 6 530 53
  3/8 120 13   3/4 11   5/8 12 590 59   3/8 120 18 645 65   3/8 120 8 6 1050 62
  11/16 120 16   1/4 13   3/8 12 1140 68   11/16 120 18 1225 74   11/16 120



Fig. 510AD & 511AD: Dimensions CYLINDER SIZE AFig. 510AD P-P Retracted1Fig.
511AD P-P Retracted1MAX.RECOM. NORMAL LOAD2 (lb.) 1 1/222132 3/43,000 2 1/22
1/223 1/436 1/410,000 3 1/4427 1/841 5/820,000 4428 1/244 1/830,000 55 1/231
3/449 1/250,000 6633 3/453 3/870,000 88 1/241 7/1662 11/16130,000 1Add cold
piston setting for install length. These values reflect cylinders having 6" of
stroke.
2Load must not be applied utisde 10º included angle cone of action to the pipe
clamp axis w/o special authorization.







FIG. 2100 IS DISCONTINUED. PLEASE REFER TO FIG. 510AD & FIG. 511AD.






ORDERING: Please specify figure no., cylinder size, stroke, load, cold and hot
piston settings, and piston end option. If clamp is required, please specify
nominal pipe size, or special O.D. and clamp material. Please specify or
describe any additional optional features or special settings required



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Have questions regarding our products or need a quote?

Contact Our Product Specialist


OUR SUBSIDIARIES


U.S. Bellows: Metallic & Fabric Expansion Joints, Bellows Sweco Fab: ASME
Vessels, Pig Launchers, Spectacle Blinds Pipe Shields: Pre-Insulated Pipe
Supports, Slides, Guides & Anchors Fronek Anchor/Darling: Snubbers, Sway Struts
& Sway Braces


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