We have utility boilers where oil is supplied to the burners and part is recirced back through a "constant differential pump" which controls the differential across the burner tips. This is a multistage centrifugal pump. The biggest ones we have are 440 GPM and 760 ft head. They pump #6 fuel oil at 210 degrees. The constant differential pumps are fed by burner pumps which put up 720 psig. Does anyone know a good manufacturer for new constant differential pumps like this (high suction pressure centrifugals)? We would prefer horizontal pumps. Are there any we should stay away from?
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