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Pulsation Dampeners - Checking Dampener Pressure Rating Safety
The design pressure is shown as part of the dampener part number code:
EXAMPLES:
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DESIGN PRESSURE
Design pressure is as used in the stress calculations for the dampener capsule or "vessel" and is derived as follows:-
Where for example, it is disclosed to PulseGuard, that the system is "a 150# flanged system at 200°F and the ANSI B16.5 flange tables state that the Max Allowable Working Pressure for a 150# flange at 200°F is say 375 psi, then PulseGuard must assume that the system Relief Valve static set pressure can typically be up to 421 psi. And without special knowledge of the relief valve characteristics, it must be assumed that the "accumulation pressure" to fully open such a valve is typically an additional 15%, then the design pressure must become 474 psi.
The above procedure for establishing "design pressure", allowing a compound 27% overage is not mandatory, the end used may purchase on the basis of stating that MAWP and Design Pressure are the same figure, but such practice, though often the result of ASME VIII and other code practice, is at the end users own risk. PulseGuard advises that using MAWP=Dp is inadvisable without an investment in a full fatigue analysis.
ANSI B16.5, tables. Allowable pressure ratings for schedules of pipe, the DN-PN European flange norms, the results of Shock analysis like LDi "SHOCKVIEW" and "PULSEVIEW" are all useful guides, however there is no real substitute, to the 40 year track record, and PROOF testing every design change to destruction, of our predecessor licensees Liquid Dynamics International Inc. & Ltd.
NOTE:
Where the setting of Design Pressure and the choice of allowable working stress figures are from current European PRESSURE EQUIPMENT DIRECTIVE "good practice" codes, OR from ASME tables, PulseGuard accepts no responsibility for the resultant strength nor fatigue life. In general those practices are only applicable to equipment that is not subjected to pulsation - in some codes called "SNUBBING" or use as a "SNUBBER".
Checking Dampener Pressure Rating Safety PDFPulsation-Dampeners.com
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