Sea water corrosion 1

[MaxNeg63]

I've received a material selection where seawater is used first to cool down process water and then reinjected into an oil well. For the first part of the seawater circuit (from intake to deaeration tower) FRP pipes are proposed, then CS pipes with 3 mm CA. Shouldn't be preferable to adopt CRA (such as SS or Duplex) for the second part of the circuit?
Thanks

 

[rorschach]

In our Intelligent well completion systems (which were commonly used as sea water injectors in the north sea) we used a super duplex stainless for that service. The PRE number was something like 40+ if memory serves (I'd have to go look it back up, don't work there anymore.). It was Foroni 918. Similar to SAF 2507 and Zeron 100. Lots of nitrogen, with copper and tungsten and moly. I used to joke that the only thing missing from the chemistry was the kitchen sink, but given the scrap market, it's probably in there too....

 

[EdStainless]

High pressure, low oxygen, high chlorides
Really, superduplex is the best bet. You can do it in CS, but maint. will be an issue.

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Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[stanier]

Have you thought of ABS? Provided that the pressure is below 15 bar this would be a good selection. Its available up to DN800. USed for sea water intakes on power stations, sewage treatment, desalination etc. No problems if you want to high dose chlorine to kill off marine organisms.

http://www.tycoflowcontrol.com.au/t...ic_pipeline_systems/Overview/plastic_products