AISI 316 ok for Subsea Hose Clamp? 1

[geirkvaale]

Hi,

I want to use a standard hose clamp (attached example) for a subsea application. (Permanent installation, about 20 years life time).

Problem is, the only corrosion resistant steel I can find for hose clamps is AISI 316. I would prefer to use a higher quality steel, like 6Mo, AL-6XN or 254SMO, to avoid the issue with crevise corrosion.

Have anybody found this before? Or will perhaps 316 be ok? Obviously a hose clamp can take some crevise corrosion before it is destroyed. It only need to seal very low pressure (about 1 psi). Max temp is about 20-30deg Celsius, and water depth 20m.

All help is highly appreciated!

 

[strider6]

stainless steel type SS 316 is not suitable for a continuos exposure to seawater at that temperature, you'll have crevice bul also pitting corrosion.
the life of SS in that condition will be short, not 20 ys for sure..
for a seawater exposure you need higher alloyed steel like 254SMO or SuperDuplex type SAF 2507 with higher PRE pitting resistnace equivalent.

http://www.stainless-steel-world.net/pdf/11003.pdf

http://www.corrosionist.com/Corrosion_Control_Seawater.htm

S

Corrosion & Rust Prevention Control

 

[geirkvaale]

Thanks for your answer strider6!

Anybody knows about hose clamps made in these kinds of steels / titanium / CuNi or other materials suited for subsea applications? I have googled a lot but can only find worm-gear titanium hose clamps. I need a a T-bolt type...

Or could an option be anodic protection of a carbon steel hose clamp?

 

[EdStainless]

I used to use Monel clamps that I believe were made by Oetiker.

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