# 3000 & 6000psi

1. Jul 7, 2012

### SoloRider

hi all
How would nitrogen behave at 3000psi? or 6000psi?
assuming it starts at liquid form and at 1 atms pressure heated to 20 Celsius.

thank you

2. Jul 8, 2012

### sankalpmittal

Only an experimenter can answer your question.

However , critical pressure at which Nitrogen can be liquefied is 34 atms. Critical temperature to liquefy Nitrogen is 140 oC . Both these conditions must be simultaneously met to properly liquefy Nitrogen. So you cannot get liquid form of Nitrogen at 1 atm pressure heated to 20 Celsius.

3000 or 6000 psi is too big the pressure !!

I think definitely this pressure will convert Nitrogen to liquid or probably solid even.

3. Jul 8, 2012

### Staff: Mentor

Google for "phase diagram for nitrogen" or some such, and you'll find diagrams such asthe following: http://www.wolframalpha.com/input/?i=nitrogen+phase+diagram

You may have to do some conversion of units to get your answer.

4. Jul 8, 2012

### SoloRider

sankalpmittal, i dont think it will turn to solid since i found a few companies using high nitrogen pressure for different uses such as this machine:
http://www.jereh-pe.com/english/products/nitrogen-pump-skid.shtm# [Broken]

Nugatory, your link looks promising thank you. What is the difference between "phase diagram" and "vapor pressure rate"?

Last edited by a moderator: May 6, 2017
5. Jul 8, 2012

### nasu

The pressure in compressed gas cylinders used in labs are around 3000 psi. Nitrogen is still gas at these pressures and room temperature.
Even 6000 psi is not so unusual:
http://www.mmr-tech.com/PDFs/NitrogenGasSpec_TSB001.pdf

6. Jul 8, 2012

### Q_Goest

Nitrogen at 20 C and 3000 psi has a compressibility factor of 1.06, so it's still very close to being an ideal gas. At 6000 psi, the compressibility factor is 1.26 so it's still a gas but is much more affected by the local molecular interactions.
The nitrogen pumper you reference is a cryogenic, reciprocating pump mounted on a trailer that pumps low pressure, cryogenic liquid nitrogen from roughly 100 psi to the higher pressure. Depending on the pump, I've seen them go up to 10,000 psi or so. Once through the discharge of the pump, the cryogenic fluid is heated to ambient temperature through a number of means, and thrust down inside a well to fracture the rock.

Last edited by a moderator: May 6, 2017
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