FW: Hydro Test

From: <Mooney>
Date: Fri Sep 26 2003 - 07:57:00 EDT

it is your perogative to test at greater than 1.5 times the design pressure of a pipeline. Code requires 1.5 as minimum, except some lines may require testing at higher than 1.5 of system flange rating due to temperature or validation to qualify an existing line.
My opinion is that more work is required to pump lines to 225psi than to 50psi or whatever would be 1.5 times design pressure. Also more lines will require rework to qualify to a test pressure that is not required for operation. Most qualified testing engineers are able to make judgements on where to place test blinds to optimize their testing personell time and equipment. Due to isolation points, some line sections may be tested at pressures greater than required.

But the easy out for the engineer is to simply go 1.5 times flange rating.

Setting up a proper testing plan is another part of executing a project and should not be approached lightly.

Kevin Mooney

-----Original Message-----
From: zope_tushar@fwuk.fwc.com [mailto:zope_tushar@fwuk.fwc.com] Sent: Thursday, September 25, 2003 10:57 PM To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Hydro Test

Friends,

Instead of testing every line at different pressure during the hydrotest, what would happen if we test all 150# rated lines at 29 barg??
(1.5times the rated pressure) This would save lots of time and money spent
for the testing.

Are there any disadvantages if we do this? What are they??

Best Regards.

Tushar Zope
Extn: 162

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Received on Fri Sep 26 07:57:00 2003