RE: pressure test thoughts

From: <Venkat>
Date: Wed Sep 07 2005 - 06:19:00 EDT

Hi Experts

What if an existing piping is rerated to a higher pressure and the available pipe thickness just satisfies the new operating pressure, Is the 1.5xtimes test pressure is mandatory in this case? Can the piping withstand the new test pressure? Operating temprerature is around 350 deg F. Code allows only upto 33% overpressure for less than 10 hrs at any one time.

Thanks

Venkat

"Sare, Ralph H." <SARERH@YANPET.SABIC.com> wrote: By the way, its almost impossible to weld a material that has undergone SCC attack. In most that Ive seen, once the welding is completed (attempted reapir) cracks (with an s) will be very visible after the application of dye pen. Worse if the DP was applied right after the hydro. Does hydro has to be 1.5X for piping system already in service that has been repaired? I wonder how its done by TDW on a welded enclsoure that they have installed for leaking pipe/valves/flanges?

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[Non-text portions of this message have been removed] Received on Wed Sep 07 06:19:00 2005