RE: Cement Lined Piping

From: <Ahmed>
Date: Tue May 29 2001 - 07:48:00 EDT

Ralph

Unless the corrosion coupon is of the same cement material its of no use.

Cement is made out of an alkaline material. If the water is anaerobic, chances are you have anaerobic bugs, which produce acids, that corrode cement.
Are there sea macro-organisms, mussels etc, lining the inside of these pipes?
What is the water velocity in the pipe? Are there suspended solids in the water, i.e. sand, shells etc.
Any evidence of the microbes previously mentioned? Describe the leaks, i.e. holes, softening of the concrete, cracks, whatever etc.
Are the leaks at the bottom or top of the pipe? Colour and texture of the concrete at the leak area.

Regards
Ahmed Vawda
Process Engineer
Al Khaleej Sugar
Dubai

-----Original Message-----
From: SARE, RALPH H. [mailto:SARERH@YANPET.SABIC.com] Sent: Tuesday, May 29, 2001 2:17 PM
To: <a href="/group/PipingDesign/post?postID=WbkzW_Ok5utm8OZPqbw8NPPUYU2qaCHZFg4yut0UUWxid4A3q3soPEzIHmKjqJHGrlCHIgdghNWtSosxNqYnAnrMHYqKlg">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] Cement Lined Piping

We have experienced a lot of leaks on our sea water cooling system. The 56" CS pipe is cement lined and was commisisioned way back in 1985 (FBE was not yet popular at that time). Its about a few kilometer long and has a coouple of inspection port, bends and branches. Anyone has a suggestion on how to rehabilitate the pipe short of replacing it. Ive got only a 5 days window. Damn corrosion coupon is of little use. We're surviving using the Belzona product (more expensive that gold on a per pound basis) to currently fix the leaks.

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Received on Tue May 29 07:48:00 2001