Behavior of Liquid Nitrogen at 3000psi & 6000psi

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Discussion Overview

The discussion centers on the behavior of liquid nitrogen at high pressures of 3000 psi and 6000 psi, starting from a liquid state at 1 atm pressure and heated to 20 degrees Celsius. Participants explore the phase behavior, compressibility, and practical applications of nitrogen under these conditions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants question how nitrogen behaves at 3000 psi and 6000 psi, particularly starting from a liquid state at 1 atm and 20 degrees Celsius.
  • One participant notes that the critical pressure for liquefying nitrogen is 34 atm and that it cannot remain in liquid form at 1 atm and 20 degrees Celsius.
  • Another participant suggests that at high pressures, nitrogen may convert to liquid or possibly solid, but this is contested.
  • Some participants reference the phase diagram for nitrogen to understand its behavior under varying pressures and temperatures.
  • It is mentioned that nitrogen remains a gas at 3000 psi and room temperature, and that 6000 psi is not unusual for compressed gas cylinders.
  • One participant provides compressibility factors for nitrogen at 3000 psi (1.06) and 6000 psi (1.26), indicating that it behaves close to an ideal gas at these pressures.
  • Another participant discusses the use of high-pressure nitrogen in practical applications, such as in nitrogen pumps, suggesting that it does not turn solid under these conditions.

Areas of Agreement / Disagreement

Participants express differing views on whether nitrogen can remain in liquid form or turn solid at high pressures. There is no consensus on the behavior of nitrogen at these pressures, and multiple competing views remain.

Contextual Notes

Participants reference critical pressure and temperature for nitrogen, but there are unresolved assumptions regarding the conditions under which nitrogen can exist as a liquid or solid. The discussion also highlights the importance of phase diagrams and compressibility factors, which may require further exploration.

SoloRider
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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
 
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SoloRider said:
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

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 ! :eek:

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

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.
 
sankalpmittal, i don't 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#

Nugatory, your link looks promising thank you. What is the difference between "phase diagram" and "vapor pressure rate"?
 
Last edited by a moderator:
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.
SoloRider said:
sankalpmittal, i don't 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#
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:

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