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Reports from a plant are they are having corrosion problems in their dehexanizer. It was found that there was oxygen present in the system. Other than any trucked in fluids or leaking flanges are there any other sources of oxygen in this system and/or what are the best methods to troubleshoot...

This is a natural gas field with 25-125 psi low CO2, 2-15 m3/d and poor flow rates

Just wondering if someone has any experience with gas boosters and knows of ways that oxygen can enter into the system (other than leaking flanges) Thanks

Quick question, this may have been posted before, but if I had 12,000 ppm or dissolved nitrate and 300-9000 ppm of dissolved nitrite do you know how much NaOH I would need to try and neutralize it since i have a pH of ~1.9? Is it almost a 1:1 ratio: i.e. with 5000 ppm nitrite I would need 5000...