Hydraulic Snubbers Brochure

TECHNICAL BULLETINwww.pipingtech.cominfo@pipingtech.comwebsite:email:Copyright © 2009 Piping Technology & Products, Inc.ENGINEERED PIPE SUPPORTSHYDRAULIC SNUBBERSTECHNICAL BULLETINENGINEERED PIPE SUPPORTSHYDRAULIC SNUBBERSHydraulic SnubberMost hydraulic snubbers have a piston which is relatively unconstrained in motion at low dis-placement 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.Some of its feature includes:External pressurized hydraulic reservoir for positioning fl exibility in any spatial orientation.• Allows free thermal movement of piping under normal operations.• Restrains shock loading, both in tension and compression.• System’s movement is controlled by a fl ow control device.• Standard Sizes of PT&P Hydraulic SnubbersBore (in.) Rod Diameter (in.) Max Recom. Loads (lbs)1.50 1 43962.00 1.00 70692.50 1.75 123703.25 2.00 204004.00 2.50 304835.00 2.00 494806.00 2.50 700978.00 3.50 121933Application:For use on piping systems or equipment when restrained thermal movement must be allowed, but which must be restrained during impulsive or cyclic disturbance. The unit is not eff ective against low amplitude, high frequency movement. Preferred usage, with standard settings, to prevent destructive results due to earthquakes, fl ow transients, or wind load. Special settings are available to absorb the continuous thrust resulting from safety valve blow-off or pipe rup-ture. For the most eff ective operation of the unit, please specify the mounting position, vertical or horizontal.Size Range:PT&P off ers seven sizes with cylinder bores of 1 1/2 to 8 inches. These units have a normal load range of 3,000 lbs to 110,000 lbs. All are made to include reservoirs in 6, 10, 15, or 20 inch strokes, except the 1 1/2 inch size. The 1 1/2 inch size is off ered in 6 & 10 inch strokes only. Snubbers, as they are sometime referred to, are available with remote reservoirs.Ordering:Please specify fi gure no., cylinder size, stroke, load, cold, and hot pistons settings, and piston end op-tion. If clamp is required, please specify nominal pipe size, or special O.D. and clamp material. Speci-fi cation or description of any additional optional features or special settings is required.DimensionsCylinderSizeStrokeIn.A B Min. C Min. C Max. Max. Recom. Normal Load (Lbs)1 1/2 5 2 1/6 1 5/8 15 1/2 20 1/2 30010 19 1/2 29 1/2 12502 1/2 5 2 1/2 2 1/4 15 7/8 20 7/8 1250010 19 1/2 29 1/23 1/4 5 3 1/4 3 17 5/8 22 5/8 2100010 22 5/8 32 5/84 5 4 3 3/4 19 1/2 24 1/2 2300010 24 1/2 34 1/25 5 5 1/18 4 1/2 21 26 5000010 26 366 5 5 3/4 5 1/2 23 5/8 28 5/8 7200010 28 5/8 38 5/88 5 7 1/4 6 28 7/8 33 7/8 12800010 33 7/8 43 7/8*Loads must not be applied outside a 10 ° included angle cone of action to the pipe clamp axis w/o special authorizationTECHNICAL BULLETINENGINEERED PIPE SUPPORTSHYDRAULIC SNUBBERSDimensionsPipe Size 1 1/2 2 1/2 3 1/4 4 5 6 83/4 2 7/161 2 9/161 1/4 2 11/161 1/2 4 1/82 5 1/8 5 1/16 6 3/8 6 3/82 1/2 5 3/8 6 1/2 7 7 1/2 8 1/83 5 15/16 7 7 7 1/2 8 3/84 6 1/2 7 7 1/4 7 1/4 8 3/85 7 7 7 3/4 7 3/4 9 1/86 8 9/16 8 9/16 9 1/4 9 1/4 10 118 9 9/16 9 9/16 10 1/8 10 1/8 11 1/4 1210 10 7/16 10 7/16 11 3/8 11 3/8 12 3/4 14 1/4 1512 11 7/16 12 9/16 12 9/16 13 7/8 15 15 3/414 12 11/18 13 1/2 13 1/2 14 1/2 15 16 1/216 13 11/16 14 7/8 14 7/8 15 1/4 16 17 1/218 14 11/16 15 1/2 15 1/4 16 3/4 16 3/4 18 1/220 15 7/8 15 7/8 16 1/224 17 7/8 17 7/8 19 5/16 20 22 2230 23 3/8 23 3/8 23 3/4 24 1/4 25 26 1/436 28 3/4 28 3/4 28 3/4 30 3/4 32 3/4 32 3/4Schematic of Hydraulic Snubber under normal conditionsSchematic of Hydraulic Snubber under locked conditionsThe Hydraulic Snubber test machine is mainly used to perform testing for hydraulic snubbers, it has a simi-lar test bed to the STADAS machine, however, it is not computer controlled. It is adequate to perform all the tests normally required for hydraulic snubbers, such as quality control and periodic tests that are sometimes required as part of plant maintenance programs. Mechanical snubbers can also be tested on this machine, but due to the complication of the process, mechanical snubbers testing is usually performed on the STADAS machine.Hydraulic Snubber Test Machine: