--obtain a pressure & temperature recorder to document pressure changes due to temperature change. (have seen 24 hr pressure tests that record pressure & temperature, significant change at sundown & sunup)
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Potter, Richard
Sent: Friday, November 12, 2010 9:30 AM
To: materials-welding@googlegroups.com
Subject: [MW:8224] RE: 8223] Hydrotest
--Our experience with hydrostatic testing is "as the temperature increases the pressure will follow."
The same works in the inverse. "as the temperature decreases the pressure will decrease".
We try to perform our hydros early in the morning. The temperature is cool and when we set the pressure it stays pretty stable. It may fluctuate a couple pf pounds but not a significant amount.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Eduardo Calva
Sent: Friday, November 12, 2010 9:21 AM
To: materials-welding@googlegroups.com
Subject: [MW:8223] Hydrotest
Hi all¡¡¡
Please could some of you tell me about changes of pressure with changes in temperature?
We have done a hydrotest twice on the same pipeline trap and both were rejected by the cliente because next:
1.- Firstone was rejected because pressure and temperature decrease
2.- Second one was rejected because temperature decrease and pressure keep without low.
And the main question is:
Does the pressure have to change by changing the temperature?Eduardo Calva
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Thanks&Regards,
Navaneethakumar.D.
+971505583738
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