Steve, suggest you consider concrete lined steel pipe, available ex Steelpipe NZ. As used on the infamous Waikato pipeline (1260 OD)with 25 mm lining. As for expansion, can you anchor at mid point and accommodate expansion at either end?
Have used PVC for piping underwater sea world project, most of this piping was internal and worked out very expensive in the larger sizes.
Best regards, Glenn
-----Original Message-----
From: smckennz [mailto:Mechproj@xtra.co.nz]
Sent: Wednesday, May 01, 2002 4:36 PM
To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Piping Material for Seawater Cooling Duty
Hi there
As part of a plant upgrade, I need to install a new cooling water
supply line to replace an existing worn out and undersized concrete
lined supply line.
The flow will be around 1200 - 1300 m^3/h and head about 50m. Max
seawater temperature is 25C, normal around 12C. On a hot day, the
ambient temperature can get to 35C briefly. Line length,
guessing,will be about 500m. The pipe will run above ground. To date
there has been no problem with marine growth fouling the existing
line. I am quite keen on ABS pipe for this duty and the owners seem
to like impact resistant PVC. The pipe runs are fairly straight, with
no room for doglegs or expansion loops. So I need to think carefully
about expansion. I was thinking of something like the rubber O -
rings used on sewer piping.
Are there any systems available for absorbing expansion at the pipe joints?
What pipe material selections would others recommend for this service? Any bad experiences?
Cheers
Steve McKenzie
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Received on Wed May 01 21:43:00 2002
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