High Sodium Sulfate Pilot Test with Various Materials

[rpeng]

We are being asked to perform a 3 month pilot test to treat process water with 15% sodium sulfate, pH around 6, temperature around 95-110 deg F. The only equipment we have (to meet the deadline) has epoxy-coated, 1/4" plate, carbon-steel tanks, with 304L nozzles (flanged and threaded). There are several welded fittings and structural members in the tank that are coated with marine epoxy. I can change out the valves and piping to PVC. The epoxy coating has decent coverage, but I have seen rusting in normal marine environments after a year in service.

We expect the equipment to get ruined in the process, but will it last the 3 months? What kind of damage should I expect?

 

[cloa]

Are you expecting full aeration? Total oxygen free would make an enormous difference.

 

[EdStainless]

You may get a little rust but it should be limited.
What about impurities? If the pH goes down and/or you get any chlorides in the system then making 3 months could be a stretch.

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Plymouth Tube

 

[rpeng]

The system will treat process water from a diesel scrubber system. The process water will contain diesel PM, copious oxygen, ammonia nitrate, Sodium Sulfate Na2SO4, and Sodium Bisulfate NaHSO3. There should be minimum chlorides present.

 

[moltenmetal]

Temperature and abrasion are modest, so properly applied epoxy linings should last the 3 months. Sounds like a fairly mild service actually.