Re: [PipingDesign] Re: Seawater cooling for power plant

From: <Alok>
Date: Thu Apr 05 2007 - 14:00:00 EDT

Put check on temp below 35 C, hope you had not much chloride. 316 is very suspectible to chloride even in lower conc i,e 50 ppm is good enough for temp 50C for stagnant condition. So there are lot of cases reported in hot climate where water was not drained properly after hydrotest and it was noticed before mechanical integrity that it has pitted. So be careful!
Cheers

How to you protect SS from chloride attack if used, without coating, for Seawater?

A J

Lead Design Engineer


From: PipingDesign@ yahoogroups. com [mailto:PipingDesign@ yahoogroups. com] On Behalf Of Dacharaju Krishnamohan Rao
Sent: 05 April 2007 07:19
To: PipingDesign@ yahoogroups. com
Subject: Re: [PipingDesign] Re: Seawater cooling for power plant

Use of SS316L and GRP for seawater service is also in practice. There is also an improvement of applying a Specail (paint) Coating inside
on SS316L for an extended life where seawater flow disturbances occur such
as downstream of valves.
regards,
D.K.M.Rao.

Alok Dubey <terrion_786@ yahoo.co. in <mailto:terrion_ 786%40yahoo. co.in> >

Sent by: PipingDesign@ yahoogroups. com
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Subject
Re: [PipingDesign] Re: Seawater cooling for power plant

Hi JUn,
stainless could be duplex (22 Cr%,...) or super duplex (25%) and that was
the intent. These two grades are used extensively in subsea or marine enviornment.
Cheers!

Sent: Tuesday, April 3, 2007 1:52:53 PM
Subject: [PipingDesign] Re: Seawater cooling for power plant

Stainless steel pipe material for sea water service?? Not in our plant.

Cupro-nickel material may be OK for US Navy application but in process/power plants where the coolant header (sea water service) is about 108 " NPS size - well you might have to rethink the economics of utilizing such material.

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[Non-text portions of this message have been removed] Received on Thu Apr 05 14:00:00 2007

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