How do you know if a liquid cylinder marked "BAD" actually needs to be sent in for repair or if the “problem” is something that can be fixed at your shop? What is “BAD?” Is it venting too much or just doing what is normal? Or is the problem a leak or a stripped fitting?
Ideally, liquid cylinders with bad vacuums should be identified and separated from other “bad” vessels since it is clear that they will need to be sent in for rehab. Segregating those with bad vacuums also allows more focus time to trouble-shoot vessels that you might be able to repair yourself.
Ideally, liquid cylinders with bad vacuums should be identified and separated from other “bad” vessels since it is clear that they will need to be sent in for rehab. Segregating those with bad vacuums also allows more focus time to trouble-shoot vessels that you might be able to repair yourself.
The SIMPLE NER test method was developed to provide an easy, clear-cut identifier for determining bad vacuums and procedures can be found in the West LCR Handbook at http://www.westcryogenics.com/Liquid_Cylinders.php. It allows for testing without instrumentation and in many cases shows there to be no problem with a vessel at all. Just a couple of weeks ago, a client called with a near urgent need to get a vessel shipped in and repaired. I walked him through hot-fill procedures in the morning and SIMPLE NER testing in the afternoon. The next morning we found the vessel was “fixed” and able to go back into service.
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