Have you looked at direct fired tank heaters? I had very good success using Infernotherm heaters in asphalt service. Their design provides a very low heat flux density for heating heavy oils. Check http://www.infernotherm.com.
Larry
What formulas are you using for sizing the RV? Since you're in the supercritical region, it will act more like a vapor relief valve than a boiling liquid RV.
Larry
tgmcg,
It doesn't really sound like a complicated situation. I'd suggest contacting your Flowsafe, Anderson-Greenwood, or other major pilot RV rep. You basically want a PRV that will have a constant backpressure on the discharge side. You probably have a huge flowrate so you may need multiple...
We have a 3600 gallon LOX dewar and we need to replace the pressure building coil. In the interest of sizing the coil correctly, I want to know how much LOX we need to vaporize to support a liquid withdrawal rate of 3 gpm at 30 psig for 16 hours. I'm getting stuck on mass and energy balances...
You will need to contact a local vendor for relief valves. Look up Farris, Anderson Greenwood Crosby, Flowsafe, or Leser and find a local distributor.
Larry
I found a paper titled "Simulation of Transient Flow in Natural Gas Pipelines", by Junyahg Zhou and Michael A. Adewumi, Pennsylvania State University, Not Dated. It was a PDF on the Web. I don't know what software they used, but the paper did comparisons with two actual field cases, and...
I just discovered today that there exists a UV-1 form for ASME Code relief valves. I have been working with relief valves dor about 20 years, and this is the first I have heard of the form's existence. I have never received one when I purchased a Code relief valve. How long have these forms...
We are working from a NASA document:
Workbook for predicting pressure wave and fragment effects of exploding propellant tanks and gas storage vessels
Baker, W. E.; Kulesz, J. J.; Ricker, R. E.; Bessey, R. L.; Westine, P. S.; Parr, V. B.; Oldham, G. A.
NASA Center for AeroSpace Information...
BigInch,
Thanks for the idea about transient gas simulation. I found a couple papers from the pipeline world that might help out. I hadn't thought of the pipeline sources before.
insult2injury,
It is better to err conservatively and use the total volume, but we're trying to fine-tune our...
I'm still trying to puzzle this out, so maybe explaining it will help. You're right, if the pipe breaks in the middle, we'll have twice the flow.
We don't have a shutdown valve. We're looking at pipe failure in a pressurized system (infinite pressure source), and my manager thinks that...
We are trying to evaluate consequence of a pipe rupture for hazard analysis work. We want to determine what length of pipe will contribute flow through a rupture up to the point that sonic flow is achieved.
Fluid is a gas (air, nitrogen, etc.) At time t=zero, we have a pressurized pipe with...
We're having a discussion about requirements for lift levers on RVs. ASME BPVC Sec VIII Div 1 para UG-136(a)(3) states "Each pressure relief valve on air, water over 140°F (60”C), or steam service shall have a substantial lifting device . . .". We interpret the "air" fluid as being ambient air...
NozzleTwister has a good point. Look at the Goulds pump page suggested by pennpiper for a good explanation. The flange facing itself is not a problem, it's the cast iron FF to steel RF bolting that is an issue. You can bolt steel FF flanges to steel RF flanges.
Larry
Ashereng's spool piece is a good suggestion, especially for new construction, but could be expensive and difficult for an existing installation. There might not be enough room without extensive piping mods. Another issue we often run into is the face-to-face dimension of new valves compared to...
UG-125 (g) says "The pressure relief devices required in (a) above need not be installed directly on a pressure vessel when the source of pressure is external to the vessel and is under such positive control that the pressure in the vessel cannot exceed the maximum allowable working pressure at...
