Pipes and tubular conduits – With flow regulators and/or baffles – Restrictors
Patent
1996-07-31
1998-01-27
Brinson, Patrick F.
Pipes and tubular conduits
With flow regulators and/or baffles
Restrictors
138 40, 251118, F15D 5500
Patent
active
057113505
ABSTRACT:
Piping systems adapted for handling fluids such as steam and various process and hydrocarbon gases through a pressure-reducing device at high pressure and velocity conditions can produce severe acoustic vibration and metal fatigue in the system. It has been determined that such vibrations and fatigue are minimized by relating the acoustic power level (PWL) generated in the piping system to being a function of the ratio of downstream pipe inside diameter D.sub.2 to its wall thickness t.sub.2. Additionally, such vibration and metal fatigue can be further minimized by relating the fluid pressure drop .DELTA.p and downstream Mach number M.sub.2 to being a function of the ratio of downstream piping inside diameter D.sub.2 to the pipe wall thickness t.sub.2, as expressed by M.sub.2 .DELTA.p=f (D.sub.2 /t.sub.2). Pressure-reducing piping systems designed according to these criteria exhibit minimal vibrations and metal fatigue failures and have long operating life.
REFERENCES:
patent: 797027 (1905-08-01), Tilden
patent: 3877895 (1975-04-01), Wonderland et al.
patent: 4422339 (1983-12-01), Gall et al.
patent: 5085058 (1992-02-01), Aaron et al.
patent: 5315859 (1994-05-01), Schommer
Technical Paper 82-WA/PVP-8; American Society of Mechanical Engineers; Acoustically Induced Piping Vibration in High Capacity Pressure Reducing Systems; V.A. Caruccii et al.
Technical Paper by F.L. Eisinger--Designing Piping Systems Against Accoustically-Induced Structural Failure PVP-vol. 328, Flow-Induced Vibration ASME 1996 p. 397 etc.
Brinson Patrick F.
Foster Wheeler Energy International Inc.
Smolowitz Martin
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