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Mechanical Snubbers Homepage > dynA/Damp® Catalog

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OPERATION
Models: AD-40, AD-70, AD-150, AD-500

   The dynA/damp® mechanical snub­ber design utilizes an oscillating verge with connecting gearing which limits the velocity of a geared rack and thereby controls the rate of linear displacement of piping or other equipment systems.
   During normal thermal transients the rack is free to displace with relatively small resistance. Upon in­troduction of an externally applied force — such as a seismic distur­bance — oscillation of the verge limits movement of the geared rack to a velocity proportional to the ap­plied load. Since the snubber is always engaged, instant snubbing action assures

positive displacement control of the connected piping or equipment.
This unique principle results in a rugged, simple device having a minimum number of moving parts.
   The dynA/damp® snubber consists of a housing assembly that encloses gearing, the verge system and a reciprocating rack. The housing and the rack are connected to the pipe and the structure respectively. The gear and verge assembly are positively engaged at all times. Due to the mechanical nature of the system the dynamic characteristics are constant and identical in extension or retraction.

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   dynA/Damp is a velocity limiting, mechanical snubber designed to protect critical power plant components during dynamic loadings caused by seismic disturbances or other transient forces. The dynA/Damp snubber has all the advantages of hydraulic dampening, without any of the drawbacks - it is a non-locking, velocity limiting device, that is always engaged and responds to dynamic disturbar jes instantly. Unlike other mechanical shock arresters, the dynA/damp® snubber is ruggedly designed and employs no complex clutches or spring mechanisms. It never needs lubrication or adjustment and can be easily tested in place.
   The dynA/Damp snubber's principle of operation, is simple and straight-forward. When a dynamic disturbance attempts to displace piping or equipment in either direction, an oscilatory type escapement mechanism restricts pipe movement to a constant velocity.
   Gradual movements, such as those caused by changes in temperature, are virtually unrestricted. On the other hand, sudden movements which result from seismic disturbances, slamming of check valves, unstable pump characteristics, discharge of safety relief valves or water hammer are instantly dampened by providing a resistance proportional to the magnitude of the disturbance.
   The superior operating principles of the dynA/Damp snubber combined with rugged, corrosion resistant construction make it extremely reliable. Designed for a forty-year service life, the dynA/Damp snubber is virtually unaffected by normal long-term, low amplitude vibration and provides dependable service over a wide range of loads and frequencies.
Mechanical Snubber

Models: AD-40, AD-70, AD-150, AD-500

 
   The larger sizes of the dynA/Damp mechanical snubber incorporate the same velocity limiting principle as our smaller rack and pinion designed snubbers.
   Three oscillating verges, set 120 apart, accept linear motion translated by a ball screw mechanism and step-up gearing. As in our smaller designs, the rate of linear displacement of piping system or equipment is controlled by means of this unique verge principle.
mechanical snubber

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When an externally applied force such as a seismic disturbance is in­troduced, the simultaneous oscilla­tion of three verges limits rotational movement of the ball screw shaft. This impedes the linear motion of the telescoping member by means of a directly coupled ball nut. The velocity attained is directly proportional to the applied load. The snubber remains always engaged and instantaneously reacts to assure positive displace­ment control of connected piping or equipment. The dynamic character­istics are also constant and identical in extension or retraction.


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figures 1 & 2

Snubber Model
Stroke (Nominal)
Rated Load (Level A & B)
Figure-1
Figure - 2
"X"
"Y"
L - Retracted
L - Retracted
Min.
Max.
AD-40
3"
400 LB.
9 3/8"
14 7/8"
63"
8 21/32"
1 3/8"
AD-70
4"
700 LB.
11 21/32"
17 5/16"
62"
11 1/16"
1 3/8"
AD-70R
2 7/16"
700 LB.
8 5/8"
13 5/8"
62"
7 1/2"
1 3/8"
AD-150
4"
1500 LB.
13 1/8"
19 3/4"
86"
12 17/32"
1 3/4"
AD-150L
8"
1000 LB.
21 1/8"
27 3/4"
86"
20 17/32"
1 3/4"
AD-500
4 7/8"
5000 LB.
16 7/8"
24 5/8"
65"
15 7/8"
2 1/4"
AD-500L
9 7/8"
5000 LB.
27 1/8"
34 7/8"
65"
26 1/8"
2 1/4"

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Snubber Model
Stroke (Nominal)
Rated Load (Level A & B)
Figure-1
Figure - 2
"X"
"Y"
L - Retracted
L - Retracted
Min.
Max.
AD-1600
6"
16,000 LB.
19 15/32"
26 1/4"
52"
17 1/16"
2 3/4"
AD-1600L
10"
10,000 LB.
21 15/32"
30 1/4"
80"
21 1/16"
AD-5500
6"
55,000 LB.
28 7/8"
40 1/8"
154"
25 15/32"
4 13/16"
AD-5500L
12"
40,000 LB.
34 7/8"
46 1/8"
176"
31 15/32"
AD-5500XL
18"
40,000 LB.
40 7/8"
52 1/8"
170"
37 15/32"
AD-12500
6"
125,000 LB.
37 1/8"
50 3/8"
80"
33 5/16"
6 5/16"
AD-12500L
12"
110,000 LB.
43 1/8"
56 3/8"
120"
39 5/16"
AD-12500XL
18"
110,000 LB.
49 1/8"
62 3/8"
114"
45 5/16"

star= TRANSITION KIT LENGTH (L- ("X" + COLD SETTING))
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IN-PLACE SNUBBER TESTING

   In response to the needs of the industry, Anchor/Darling designed the dynA/Damp® mechanical snubber with a unique, test-in-place option and developed the equipment necessary to permit utilities to perform operational testing on site, in location, using their own plant personnel. The equipment is designed to test, in situ, dynA/Damp® mechanical snubbers for operability based on the guidelines for testing recognized by the NRC and ANSI/ASME O & M 4.
   The test-in-place tool consists of a solid-state control console, an electric drive head and adapters which allow for testing the complete line of dynA/Damp® snubbers. The console and drive head are connected by 100 feet of replaceable cable. For instant hard copy of the test data, a two-channel strip recorder, which records both RPM and torque is provided.
   For additional information about dynA/Damp®'s exclusive in-place, time-saving test feature, contact your local Anchor/Darling sales representative today.
testing_machine
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CUSTOM DESIGNED EQUIPMENT
   Along with the standard dynA/Damp® mechanical snubber, Anchor/Darling can provide locking type mechanical snubbers for use as whip restraints for large pipes and vessels, as well as restraints for relief valve reaction forces. These snubbers are custom designed to fit your application — yet designed, tested, and supplied to you within lead times normally associated with standard equipment.
   Equipment is available in loadings from 10 kip to 125 kip, with stroke and end connections to fit your applications. For more information on our equipment for special service, please contact either the regional office nearest you or our Laconia, New Hampshire office.
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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.


For Further Information Contact:

Fronek Anchor/Darling Enterprises, Inc.

86 DORIS RAY COURT
LACONIA, NH 03246

Phone: (713) 731-0030
Fax: 713-731-8640

 

 

 



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