Chemical Processing - December 2007 - (Page 32)

>> PROCESS PUZZLER counteract it. This is not typical of weighted relief plates. Paul Schoen, senior process engineer, Harris Group, Seattle, Wash. Hinges stick My biggest concern is the hinge. It adds an unknown to force; another problem is the varying discharge opening. Eliminate the hinge and prevent the plate from blowing off with some wire or chain. Once you’ve freed it to blow clear without restriction, the calculation is straight-forward compressible gas, allowing you to replace your consultants with a sophomore in any engineering college. Jim Cesen, superintendent, Rhodia, Baton Rouge, La. Correct the calculations Be happy that your tank is rated high enough so that your tank relief vent may be set at 8 in. w.c. As long as the errors in the calculation can be fixed and still allow the 8 in. w.c. relief setting, why would anyone want to reduce the set pressure back to 2 in. w.c.? Just an aside, does this tank have a side protruding overflow nozzle or does this top mounted tank vent double as overflow protection as well? Finally, without model and vendor data for the relief, together with the tank design pressure and a sketch, there’s not much else to comment on. Rick Vogel, senior process engineer, Fluor, Greenville, S.C. Use CFD API standards for years have neglected the lift plate, a common vent problem. Lift plates may protect atmospheric tanks, which are far less dangerous than those falling under Div. 1 and 2 of the ASME code. Unfortunately, the burden of specifying this relief device has fallen to manufacturers. A good example is an H2O2 manufacturer, which provides details of such a plate for protection of its customer’s storage tanks. This negligence has permitted some strange and dangerous designs to emerge. 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Table of Contents Feed for the Digital Edition of Chemical Processing - December 2007

Chemical Processing - December 2007 Contents From the Editor ChemicalProcessing.com Field Notes In Process Energy Saver Compliance Advisor 2007 Vaaler Award - The Quest Ends Take Equipment Diagnostics to a New Level Better Bellows Boosts Blending Process Puzzler Plant InSites Equipment & Services Product Spotlight/Classifieds Ad Index End Point

Chemical Processing - December 2007

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