Submersible fire pump and ordinary sewage pump impeller, pump body what is the difference between

Submersible fire pumps are basically the same as ordinary submersible pumps, only the impeller and the pump body are made of corrosion-resistant non-rusting materials, so that the fire accident can be safe at any time to start the water supply! The general use of multi-stage impeller and the shell, head is relatively high sewage pump!

Ordinary sewage pumps are generally more centrifugal structure, and basically a single-stage impeller, impeller channel is wider in order to pass through the mud and debris, sewage pumps are generally pump body using a worm casing type more, because of the harsh working environment needs to be wear-resistant, so the pump body and the impeller is generally more cast steel!

Pure hand-typed, hope to adopt!