Pumps in hazardous environments

This pump worked out quite well in our system. However, it is not rated for use in an explosive environment, so I cannot recommend using it. We distanced the pump from the system, and placed it at a lower position than other system components. Hydrogen rises swiftly and dissipates when not confined, so a lower and distanced placement of this equipment satisfied our safety requirements. However, it may not meet the standards necessary according to your AHJ. 

This particular FloJet could be enclosed in a positive pressure vessel, as was done with the process controller for this project. It could easily be slipped into standard PVC pipe fitted with screw-on pipe caps and a pressurization port. Also, an air driven pump and/or pulley driven pump could be used instead, or purchase a pump that is rated for hazardous environments. 

We had this pump on hand from a previous solar project. It suited the system s requirements for pressure delivery, and it could be powered by a PV/battery system, which was an important criterion for us. 

Depending on the pump you use, make sure that it is shielded from sunlight, dust, dirt and water, including wash down spray, rain, snow, heavy condensation, and dew. 

If a check valve is used in the feed system, it should not exceed 2 psi cracking pressure, as it can interfere with the priming ability of the pump. 

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