NER and Vacuum for cryogenic tank

[refaz...@gmail.com]

Good morning every body,

Following your knowledge and your experience, please advise me how to determine the nitrogen evaluation rate (NER) for the cryogenic tank.

My question:

-          Is there any code to control the NER?

If no code any procedure or specification on the subject would be appreciated.

Also, following the Manufacture’s Data Report for the tank, the acceptance standard maximum is 150 mtorr for 72 hours. Is this value (150 mtorr) mentioned in the codes and standard or just manufacturer’s standard?

Thanks in advance.

 

[George Dilintas]

Evaluation or Evaporation?

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Dr. Georgios Dilintas,

Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

[Brl Pp]

Hi M. Georgios Dilintas,

Thanks for your replay.

I correct, Evaporation not Evaluation

For help, I need your experience about the Evaluation of NER by pressure rise methode.

Your response for my preocupation is helpful.

Thanks in advance.

Benadjal Redouane

Mechanical engineer Sonatrach algeria