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look up "SELECTION AND SIZING OF PRESSURE RELIEF VALVES" by Randall W. Whitesides, P.E.. Its all over the net....I couldnt dowload the link either.

See article attachemnt. Go to the viscous flow section.http://files.engineering.com/getfile.aspx?folder=fa10e8b9-41a2-49a0-bec2-e76db4f046d0&file=Selection%20and%20Sizing%20of%20Pressure%20Relief%20Valves.pdf

I am sizing a PSV for fire case on Toluene that will discharge to a common scrubber header. What is the accepted method to determine superimposed backpressure on the PSV from the header? Normal running condition, all reliefs on the header discharging at the same time, some reliefs discharging, etc.?

You need to concern yourself with non recoverable pressure loss on the inlet and outlets, based on Rated Flows. Try a balanced bellows valve if the outlet drop is greater than 10% of valve set.

You must go to a DIERS approach, which resolves the Kv factor for Reynolds numbers less than 400. The API 520 Kv table/chart is useless at low Reynolds Numbers.

I just need a schedule of typical wall thickness to compare to my measured thicknesses for now. I suspect it was designed to AWWA. I may have to use B31.1 however to estimate min. thickness for remaining life.

I have two samples of 14" nominal diameter cast iron pipe in plant water, underground service (per original plant drawings) that I have been asked to review for corrosion and remaining life. The UT wall thicknesses are in the 0.676" to 0.706" range. There does not appear to be any lining. Are...

Labor - Figure out the circumferential distance of each butt joint based upon OD. Figure out the number of passes to complete the butt joint and multiply by the circ. This will be the total inches a welder has to "fill". USe 1.5 "/minute for field SMAW (stick) and 2 - 2.5"/min for shop GMAW...

Thanks for the feedback. This was my first thought, also. Its a picky customer and I wanted to be conservative, and felt it wouldnt break the bank.

I have to make a 1/2" carbon pipe w/ screwed fittings to 3/8" stainless tubing transition. This is 150# steam service for heat tracing application. To be most conservative, Id like to use a C/S 1/2" RFWN flange to S/S 1/2" RFWN flange with isolation gasket kit. From there, Ill bush down to 3/8"...

For the API 520 All Vapor Flow case reaction force calculation (API 520, PArt II, 4.4.1.1), a component P is referenced as the static pressure in discharge pipe at point of discharge. What value is this? Is this 0 psig for all discharges to atmosphere? Is it the built up back pressure due to...

For the API 520 All Vapor Flow case reaction force calculation (API 520, PArt II, 4.4.1.1), a component P is referenced as the static pressure in discharge pipe at point of discharge. What value is this? Is this 0 psig for all discharges to atmosphere? Is it the built up back pressure due to...

thanks. Of course as soon as I posted this my customer put the project on hold....

I have a 1965 drawing referencing 3/16" carbon steel plate on a rectangular hopper. The hoppers are collection under a cement kiln electrostaic precipitator. What ASTM specification would these likely have been made to? I dont believe they would have been A-283 or A-285 plate, probably either...