ブックタイトルHYDRAULIC SNUBBERS

概要

HYDRAULIC SNUBBERS

1. OUTLINE OF PIPE HANGERS AND SUPPORTSDepending on their function and uses, hangersand supports are classified as follows:(A) Items designed to support the weight ofpiping and equipment; these are collectivelyreferred to as Hangers or Supports.(B) Items designed to restrain or limit threedimensionaldisplacements due to thermalexpansion; these are known by the genericterm of Restraints.(C) Items designed to prevent piping systemsfrom cyclic loading due to forces other thangravity or thermal expansion, such as impactby vibration, earthquake, and water-hammer;these products are called Braces or SnubbersEach of the above three categories is subdivided,according to applications and functions, as shownin Table 1-1 and Fig. 1-1.Table 1-1 Classification of Hangers and SupportsItemNo.Divisions SubdivisionsDesignation Application Classification ApplicationA Hangers and SupportsTo support weight of pipingsystems, either from above(Hangers) or from below(Supports)① Rigid Hangers For point without verticaldisplacement.② Variable Spring HangersFor point with small verticaldisplacement.(upto approx. 50mm)③ Constant Spring HangersFor points with large verticaldisplacement.(over approx. 50mm)B RestraintsTo restrain or limit movementof piping systems due tothermal expansion.④ Anchors To completely fix the pipingsystems at certain points.⑤ StopsTo prevent longitudinalmovement of pipes whileallowing them to rotate.⑥ Guides To permit displacement onlyfor specified direction.⑦ Rod Restraints To prevent pipe movementfrom voluntary directions.C Braces or SnubbersTo limit pipe movement dueto forces other than thermalexpansion and gravity.⑧ Vibration Eliminators To prevent or diminishvibrations.⑨ Hydraulic SnubbersMechanical SnubbersShock AbsorbersTo suppress movementdue to earthquake, waterhammer,relief valve reactionwithout restraining thermalmovement.Fig. 1-15