One power station discharge in Malaysia fitted an ABS line inside the outfall. Every so often they superchlorinated the line to remove the mussels and other sea life that was encrusting the outfall. --- Samuel Liu <samuel.liu@amec.com> wrote:
<HR>
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<tt>
Cement Lining Steel Pipe recommended, and my previous company had an<BR>
experience for a 44" Sea Water line in South Sulawesi, Indonesia. The<BR>
expansion joints were made in Sulabaya, one manufacturer standard product<BR>
which is made of rubber (sorry I have no name around my hand). In addition,<BR>
the piping and pump are equipped with Cathodic Protection System, and a gas<BR>
Cl2 injection system applied to the pump suction. One of the most notable<BR>
bad experiences was the suction filter often blocked by seasonal sea-life,<BR>
lasting almost two months each year, so that a forced turndown happened
many<BR>
times at the first year.<BR>
<BR>
Regards, <BR>
<BR>
<BR>
Samuel<BR>
<BR>
-----Original Message-----<BR>
From: Glenn Dillon [mailto:glenn.dillon@task-consultancy.co.nz]<BR>
Sent: Wednesday, May 01, 2002 7:44 PM<BR>
To: PipingDesign@yahoogroups.com<BR>
Subject: RE: [PipingDesign] Piping Material for Seawater Cooling Duty<BR>
<BR>
<BR>
<BR>
Steve, suggest you consider concrete lined steel pipe, available ex<BR>
Steelpipe NZ. As used on the infamous Waikato pipeline (1260 OD)with 25
mm<BR>
lining. As for expansion, can you anchor at mid point and accommodate<BR>
expansion at either end?<BR>
<BR>
Have used PVC for piping underwater sea world project, most of this piping<BR>
was internal and worked out very expensive in the larger sizes.<BR>
<BR>
Best regards, Glenn<BR>
<BR>
-----Original Message-----<BR>
From: smckennz [mailto:Mechproj@xtra.co.nz]<BR>
Sent: Wednesday, May 01, 2002 4:36 PM<BR>
To: PipingDesign@yahoogroups.com<BR>
Subject: [PipingDesign] Piping Material for Seawater Cooling Duty<BR>
<BR>
<BR>
<BR>
Hi there<BR>
<BR>
As part of a plant upgrade, I need to install a new cooling water<BR>
supply line to replace an existing worn out and undersized concrete<BR>
lined supply line.<BR>
The flow will be around 1200 - 1300 m^3/h and head about 50m. Max<BR>
seawater temperature is 25C, normal around 12C. On a hot day, the<BR>
ambient temperature can get to 35C briefly. Line length,<BR>
guessing,will be about 500m. The pipe will run above ground. To date<BR>
there has been no problem with marine growth fouling the existing<BR>
line. I am quite keen on ABS pipe for this duty and the owners seem<BR>
to like impact resistant PVC. The pipe runs are fairly straight, with<BR>
no room for doglegs or expansion loops. So I need to think carefully<BR>
about expansion. I was thinking of something like the rubber O -<BR>
rings used on sewer piping.<BR>
<BR>
Are there any systems available for absorbing expansion at the pipe<BR>
joints?<BR>
<BR>
What pipe material selections would others recommend for this service?<BR>
Any bad experiences?<BR>
<BR>
Cheers<BR>
<BR>
Steve McKenzie<BR>
<BR>
<BR>
<BR>
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