pipeline internal corrosion
pipeline internal corrosion
(OP)
A pipeline has been partially filled with seawater following its accidental rupture it is simple Carbon Steel X65. Let admit that there is 1mm corrosion allowance. How long would it take for seawater to degrade the line internally knowing that the line has been sealed plugged just after its rupture.





RE: pipeline internal corrosion
The corrosion process will continue until the oxygen dissolved in the seawater will be used up. Then it will stop. Perhaps not more than say, 0.1 mm. The presence of chlorides in the seawater will generate pitting locations of concentrated corrosion. If you drain, flush with clean treated water and dry the pipe, nothing much will happen, apart of that rusty colour inside the pipe. However, bring some fresh water with dissolved oxygen, the points of pitting will degenerate quite quickly in advanced corrosion points, most likely to perforate the pipe at a rate higher than in other places, perhaps at some 0.1 - 0.5 mm per year, depending also on temperature, fluid flow velocity, etc..There is a wealth of information on the net, have a go at it.
cheers, gr2vessels
RE: pipeline internal corrosion
to give a reply is necessary to have an idea of the type of service and chemical composition of the fluid.
S.
http://www.corrosionist.com
RE: pipeline internal corrosion
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/
RE: pipeline internal corrosion
RE: pipeline internal corrosion
RE: pipeline internal corrosion
RE: pipeline internal corrosion
Romero JM, et al, Localised Corrosion Of API X52 And API X65 Pipeline Steels In The Presence Of Treated Seawater Used In The Oil Industry, Corrosion, Vol 60, (7), 2004, pp689-696
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/
RE: pipeline internal corrosion
S.
http://www.corrosionist.com
RE: pipeline internal corrosion
Maybe ruinning at batch of biocide would help - but that could cause leakage of biocide to the sea. Dont know how serious your local authorities is about this in your ares (dont know your area either
Best regards
Morten
RE: pipeline internal corrosion