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I'm trying to find a copy of the HPTA High Pressure Safety Code, put out by the High Pressure Technology Association in the UK in the 70's. Any hints or clues? I have a nice description of it in the 1975 High Pressure Engineering conference proceedings from IME, but am running into a brick wall...

I need a lab to do air filter media performance testing per ISO 5011. Any suggestions? (I can't use SWRI because of a conflict of interest on this project). Thankx.

Rod, An APU would be nice. I'm stuck with a PTO-driven pump.

Info from Allison on truck transmissions says to not tow w/o disconnecting driveshaft. What's the problem w/ towing w/ driveshaft? Could I do it if I leave the engine running to drive lube pump? (I'm specifically thinking of a cement truck where you would want to leave the engine running to...

Whoa - guys... I didn't mean to get everybody's blood pressure up! The device was suggested as a low-cost solution for a situation that needs a rupture disc & someone thought that he had heard of such a gadget in the distant past. Thanks for your comments.

Is anyone familiar with a pressure-relieving flange gasket?? It reportedly fits between 2 pipe flanges like a regular gasket, but blows out when a given pressure is reached.

Is anyone familiar with a pressure-relieving flange gasket?? It reportedly fits between pipe flanges like a regular gasket, but blows out if pressure reaches a given level.

Gracias.

If I have a brew of hydrocarbons (eg. mixture w/ aliphatic diesters) that has a published VOC of 7.813 lb/gal, is there any way to guess a molecular weight of the vapor?? (vapor pressure = .200mmHg @ 68F)

Thanks for the comments. Obviously, testing would be best.

Thanks. Would Raoult's law give a pretty good guess? VPtot = X1*VP1 + X2*VP2 Where X's are molar %

If I have a solution of one liquid, say gasoline, of known vapor pressure, dissolved in another liquid of known vapor pressure, say diesel fuel - what's the vapor pressure of the solution?

Hey, if you're a star, your're a star. What I conclude from this little discussion is that for something approximating an ideal gas, the % volume is equal to the ratio of partial pressures, whether I know the molecular weight or not.

Thanks, once again. I got the 8x specific gravity of diesel vapor from an MSDS. Your explanation makes much more sense.

Thanks for the comment. Duh, I should have caught that - Thanks for graciously refraining from pointing that out. As they say, I get by with a little help from my friends. So, the mass of diesel evaporated in the tank is more correctly 0.0231 lbm, and to further beat this dead horse: Diesel...

OK, let me get this straight. The equations seem straightforward enough, but as a guy who learned to do engineering with a slide rule, I always feel a bit better if the answer seems to make sense. For: #2 Diesel fuel Air @ 60F Partial Pressure: .0074...

Thanks for the helpful info. I also posted a similar question to the "Chemical Engineering - Other" forum where it got some good comments, including a link posted by 25362 to a good Chevron tutorial on diesel fuel

Thanks for the info. Any hints on how to convert mol % to % volume or % mass??

Hi. I'm trying to calculate the concentration of vapor in a tank containing liquid #2 diesel fuel & air. I have numbers for vapor pressure, which would let me calculate the concentration if it were an ideal gas or other pure substance. Is there a rough approximation of an equivalent molecular...

I'm doing some estimates of choked flow of methane thru a leak in a pipe. Any recommendations for what coefficient of discharge to use? I have used 0.6, but I've seen some examples on the web of 0.72. My current problem is a 1" hole in a 1-1/4" elbow (1.38" ID), but I'm also...