Re: [MW:8226] RE: 8223] Hydrotest

For me the pressure is the important issue and if the prevailing temperature increases then the pressure should be reduced to the required value- I don't understand any rejection if the pressure increase marginally as the material stress values are OK with high yield values well within any code parametets.
A

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From: materials-welding@googlegroups.com <materials-welding@googlegroups.com>
To: materials-welding@googlegroups.com <materials-welding@googlegroups.com>
Sent: Fri Nov 12 15:29:30 2010
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.

 

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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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