Re: RE: [Piping Design] Hydrotest pressure

From: <John>
Date: Wed Nov 02 2005 - 06:57:00 EST

As I understand the testing procedure is along this line. The pressure is raised slowly watching the volume being input. When a point is reached that despite additional volume being added to the system the pressure no longer rises (due to dilation of the pipe wall (yielding)) the pump is turned off and blocked off.

This marks the hydrotest pressure. Then the system either holds pressure or it decays, a decay indicates a failure of the pressure boundary somewhere in the X miles of buried pipe line. Finding the failure must be a wonderful job! The cold working of the metal is very slight and the actual in service pressure is less than the hydro pressure.

Regards,

J.C.Luf

• Christopher Wright <chrisw@skypoint.com> wrote:

> So what makes them sure they haven't done something
> unpleasant that's
> just waiting for another load cycle to let go? How
> do they determine
> yield?

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Start your day with Yahoo! - Make it your home page! <a href="http://www.yahoo.com/r/hs">http://www.yahoo.com/r/hs</a> Received on Wed Nov 02 06:57:00 2005