Cathodic protection bare stainless steel 316

[Rachbay]

Hi all,
I have to design a Cathodic protection system for a short section of non coated stainless steel pipe (almost 300m) buried in soil ( 1500 ohm-cm).
What current density should I use? According to some website it take less then Carbon steel pipe, but I do not find any standard with a recommanded current density for SS316. Please if Someone have a good reference?

 

[TugboatEng]

Who specified 316 SS for burial?

 

[Rachbay]

Who specified 316 SS for burial?

the 316 SS was chosen by other team to have less water contamination by internal corrosion

 

[weldstan]

Prior to my employment with a gas utility, 316 was specified for bare riser piping but had a 4" long PE sleeve at one section of the riser. Leakage was found in locations where high chloride content water was used. Crevise corrosion primarily under the sleeve and at locations where stones were in contact with the pipe surface was the cause. Chlorides concentrated over a few years depending on sparse rainfall and homeowner water use.

316 was specified because it didn't require a sacrificial anode acccording to earlier published governmental studies. Where crevise corrosion can occur, don't specify SS without real protective measures.

 

[Rachbay]

Prior to my employment with a gas utility, 316 was specified for bare riser piping but had a 4" long PE sleeve at one section of the riser. Leakage was found in locations where high chloride content water was used. Crevise corrosion primarily under the sleeve and at locations where stones were in contact with the pipe surface was the cause. Chlorides concentrated over a few years depending on sparse rainfall and homeowner water use.

316 was specified because it didn't require a sacrificial anode acccording to earlier published governmental studies. Where crevise corrosion can occur, don't specify SS without real protective measures.

Thank you!
Is it possible to share the link or the titre of the published studies?

 

[EdStainless]

The real issue with CP on buried SS is that you need very uniform coverage.
Since pitting is a very localized phenomenon people often use a full mesh grid for the electrode.
It is a real pain in the butt.