Search results for query: *

More Help needed on this topic; Can someone help answer this: Why does ASTM D 1250 use 8.328 lb/gal as the density of water at 60F. Based on all of my reference books, 8.3372 lb/gal is the correct density for water at 60F. This is driving me crazy because I get a different density when...

I am looking for a product that I recieved a free trial email about a few months ago that stated it enabled you to write formula in cell blocks of excel like you would on paper(something like mathCAD I am assuming). Can't find the emial and was wondering if any tried it out. If so, please like...

ProcengIV, What is the open pipe flare rate equation for? I am working on a system that needs to have a continuous purge to keep the mateial in a silo O2 free. How do I know what velocity is needed to keep O2 from backwarks diffusing into the vessel. Thanks,

One more thing to consider with a variable surface area exchanger: As you decrease area, you increase heat flux and skin temperatures. Columns with fouling problems like C3 or C4 splitters may have shorter runs or increased fouling because of this control scheme. I have not experienced this...

I am reviewing the sizing and installation of several RV's and have the following questions: 1. Can a Relief Valve be installed on the outlet piping of the vessel it is protecting? Common sense would say yes, as long as the pressure vessel does not add any addition pressure drop. What if the...

Ris2, I have never done the calcs, but I believe a few things determine the flare purge rate: 1. The rate should be sufficient to account for a rapid cooling of the flare header. If the purge is not sufficient then you can loss your DP to the surroundings leading to possible contamination or...

Sandeepdalvi, You might want to look at the driving force for this system again. I agree if you have 150# steam, then ultimately you can have 150# driving force on the condensate. However, for a stable system or unit the true driving force is the saturation pressure corresponding to the steam...

I am trying to estimate the amount of HC's that leaks out of a hydrodynamic seal on a large gas compressor. The seal has two sealing faces and two buffer gas purges, JC Type 28AT. It is assumed that both the primary and secondary faces failed and opened completely. How should the...

I am trying to estimate the amount of HC's that leaks out of a hydrodynamic seal on a large gas compressor. The seal has two sealing faces and two buffer gas purges, JC Type 28AT. It is assumed that both the primary and secondary faces failed and opened completely. How should the...

gill78, Can you give more information about your problem.... Assume by PPM you mean part per million and NOT lbs per minute. What kind of flowmeter, mass or volume? What kind of control scheme are you looking to setup? Regards, Matt

Restriction Orifices in Choked Flow? I am working on a restriction orifice in a gas service with the downstream pressure is less than Pchoked. The original design has a Po=285psia and requires a 200psi permanent DP. For this system Pchoked ~155 psia. This is where things get a little...

TD2K and Unclesyd, Thanks for the info. Also, the system pressure ~600 PSI. I will have someone double check how we make this connection. This is not my specialty... Regards,

When does a section of pipe need to be coded as a ASME Vessel? I am planning to install a “wide spot” in a line below a small tank to allow time to depressurize and refill on the run. We currently use the tank's sightglass for this, but it is not large enough for a new product I will be...