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High Sodium Sulfate Pilot Test with Various Materials

High Sodium Sulfate Pilot Test with Various Materials

High Sodium Sulfate Pilot Test with Various Materials

(OP)
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?

RE: High Sodium Sulfate Pilot Test with Various Materials

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

RE: High Sodium Sulfate Pilot Test with Various Materials

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

RE: High Sodium Sulfate Pilot Test with Various Materials

(OP)
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.

RE: High Sodium Sulfate Pilot Test with Various Materials

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

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