RE: Sea Water Piping

From: <Steve>
Date: Thu May 02 2002 - 04:48:00 EDT

Hi Ralph

thanks for that.
could you expand the following acronyms: pccp
Icc
rca

Have you had any experience with polyethylene pipe in seawater?

Cheers

Steve McKenzie

-----Original Message-----
From: SARE, RALPH H. [mailto:SARERH@YANPET.SABIC.com] Sent: Thursday, May 02, 2002 8:19 PM
To: 'PipingDesign@yahoogroups.com'
Subject: [PipingDesign] Sea Water Piping

ive seen the perfromance of nickel alloys (limited to 4 nps and under), frp, pccp and mortar-lined piping (up to 114 inch dia)in sea water application. Nickel alloys are good but expensive. pccp is ok for buried line. problem is mostly confined to frp and cement-lined piping (to awwa c205). With frp the issue is related to the strenght and maintenance (repairing is a headache).
With cement-lined, problem is mostly due cracking or spalling of the cement
(our guess is shock or water hammeris the culprit) leading to corrosion
leading to leaks. ive noticed it at areas near or at cement sleeve location, branch connection and flange joints. these are the downside. its a nuisance but manageable.

We've done a study to rehab and find a long-term soln for our Cement lined piping (sea water cooling). The alterntive (such as the use of frp or other type of "plastic" pipe) has shown the same result - it failed the lcc req't. we've also run different scenario to assess the risk including rca - our conclusion always pointed to the cement-lined piping as the matl of choice
(at least for our application).

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Received on Thu May 02 04:48:00 2002