Pumps for Sodium Hypochlorite (NaOCl)
Why sodium hypochlorite is hard on pumps
Sodium hypochlorite attacks most metals, degrades many elastomers, and off-gasses in service. The off-gassing matters as much as the corrosion: gas coming out of solution can vapor-lock suction lines and damage pumps that cannot tolerate entrained gas. Concentration, temperature, and storage age all change how aggressive a given hypochlorite stream is, which is why a pump that survives one bleach service can fail quickly in another.
Approaches that get specified
For transfer and sump duties, engineered thermoplastic pumps with no metal contact with the fluid are the common answer, often in sealless or magnetically driven configurations that remove the mechanical seal leak path. For chemical feed, digital dosing pumps meter hypochlorite at high turndown, and peristaltic designs isolate the fluid entirely in a tube. Piping and valves deserve the same scrutiny as the pump: thermoplastic valve and double containment piping systems complete the corrosive loop.
How RE Merrill confirms the selection
Material recommendations for hypochlorite depend on concentration and temperature, and we treat them as engineering determinations, not sales copy. We confirm wetted materials against curated compatibility data and factory guidance before we quote. Send the duty: fluid, concentration, temperature, flow, head, and whether the service is transfer, feed, or sump, and we return a confirmed selection.
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