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Recommendations for Sodium Hypochlorite Leaks

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Sodium hypochlorite is a highly corrosive chemical used in the textile and paper industries, wastewater treatment plants, and bleach production.

When it reacts with acids, chlorine gas is released, which is a highly toxic gas.

For these reasons, caution should be exercised when using sodium hypochlorite.

"Sodium hypochlorite leakage from threaded and solvent-based connections during the assembly of dosing pumps and accessories is one of the most significant problems we hear about from customers."

Here are some suggestions that can help reduce this problem:

CPVC material pipes, fittings, valves and accessories should be used in pressurized applications.

Using standard PVC adhesive is not recommended for solvent bonding. Sooted silica acts as a hardening agent and is dissolved by hypochlorite, leaving the joint porous and prone to leakage. NSF61 approved chemically resistant Weld-On 724 CPVC adhesive is recommended.

Threaded connections should be avoided when using NaOCl. Flanged and solvent-jointed connections are preferred. However, if threaded connections are used, it is recommended to use E-6000 adhesive as a sealant.

Finally, the pulsation and vibration generated by the dosing pump can damage the bonded joints. Using a properly sized "pulsation damper" will overcome this problem.

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