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Could be a temperature limit on soft goods (elastomers) on the compressor package that defines a temperature limit on operating the compressor.

I believe the original post sets the 100% level at top of tangent line. Depending upon vessel size there can be a significant vapor space above the tangent line. My comfort zone is not in the relative percentage of filling, but in the accuracy of the measurement and the time required to...

Ryan Ouderkirk published a paper "Rigorously Size Relief Valves for Supercritical Fluids" in CEP August 2002 that may provided a method for this case.

Pressure measurments are not normally flowing devices. As such only pressure signals are need. Therefore instrument tubing over piping is generally preferred. The case for piping connection is defined more for a structural need.

Insufficient information. Pressure, Temperature and Composition will give you state information, but not mass flow rate. You may be able to approximate it by assuming another piece of information (maximum velocity in the pipe).

DesignerMike - Your numbers seem a bit off. (3.412 BTU/Watt-hr)(1 hr)(3 blankets)(1200 Watt/blanket) = 12,283 BTU. This is well below the 250,000 BTU you say you need. This also assumes all the blanket energy goes into the oil, which is unlikely. Cheers! MPritchett

MortenA: What is your source for N2 Molecular weight? Mine shows 28.0134 lb/lb-mole. Cheers! MPritchett

We use WinSim's Design II for Windows, but it may be more than what you are looking for. http://www.winsim.com/ Cheers! MPritchett

TD2K, Perhaps a direct like to the following PDF will be helpful. No K values, but there is pressure/flow data. http://www.spray.com/products/fire_protection_pdfs/HW-HHW%20FullJet.pdf Cheers! MPritchett