3LPE is commonly used as an external pipeline coating for offshore and onshore carbon steel pipelines. Assuming your seawater contains oxygen (it normally does) then a carbon steel pipeline will be subject to internal corrosion, and notably at the welds. The alternatives are plastic lined carbon steel, GRE or polyethylene pipe. The stainless steel alternatives which are considered to be seawater resistant are 6Mo or super-duplex (PREN greater than 40).
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Sandeep Karnwal
Sent: 27 May 2014 03:43
To: materials-welding@googlegroups.com
Subject: Re: [MW:20886] Pipeline selection criteria
Low Mn contain coating
On 26-May-2014 11:16 AM, "Saidur Rahman" <saidur04cuet@gmail.com> wrote:
Dear Experts,
Normally Cross-coutry pipelines are 3LPE coated (except marshy land). If i want to make a pipeline near the sea or the land contain salt water which type of coating i will choose & what will be the grade of the pipe & chemical composition?
Experts recommendations are required.
Regards,
saidur
QA/QC
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