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316 and Brine

316 and Brine

316 and Brine

(OP)
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.

RE: 316 and Brine

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.

RE: 316 and Brine

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.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: 316 and Brine

(OP)
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!

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