316 and Brine

[mcecasf]

Hi,

A contractor has installed a section of pipework, control valve, flowmeter and isolation valves in 316 stainless steel (may be 316L not sure). The duty will be saturated brine at ~10-20 degC. It is ~1" line and will see a reasonably constant flow for most of the time but possibility of e.g. 4 days out of 7 no flow (but still flooded).

I'm worried about corrosion and pitting. Is there anything I can do to already installed equipment to reduce the likelihood of damage to the lines? I've already asked them to confirm passivation completed before we put into service, should I insist on pickling first?

I'd rather not have to have it ripped out and replaced at this stage in the game.

 

[micalbrch]

We made good experiences with 316L and brine as long as the temperature is low as it is in your case, plus you have the line filled all the time. I would not expect problems.

 

[EdStainless]

What kinds of valves? I have seen crevice corrosion on SS balls in ball valves in brine service. it may be as easy as upgrading the internal trim on the valves (ceramic is my favorite).
I would also look at any threaded connections as potential corrosion sites.
At least you know where to inspect, threads and any field welds.
Put together a good inspection plan.

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Plymouth Tube

 

[mcecasf]

thanks folks for quick response! Most valves are butterfly, no threaded bits (all welded except a couple of hygienic unions). Will keep an eye on it rather than scream!