Pump World

TECHNOLOGY | The self-priming pumps made for heavy liquids


The self-priming pumps are mainly used for liquids with high-density level or presenting high vapour pressure such as acidscaustic soda and sodium hypochlorite or even alcohol

ARGAL offers 3 self-priming ranges, available in PolypropyleneE-CTFE or ECTFE+carbon fiber (Ex-proof) that operate with higher suction length and shorter priming times than traditional self-priming pumps. 

Discover them now...

        ELK            RHINO                 HIPPO 

ELK - With capacities up to 40 l/min, the ELK peripheral self-priming pumps are particularly suitable for suction and delivery of chemical agents within very rapid priming times. ELK pumps are also reversible: by reversing the direction of rotation, the flow direction of fluids to be transferred is reversed. 

RHINO - The biphasic impeller mag-drive self-priming turbopump was conceived to prime both high-density fluid and high vapour pressure fluids. Reaching up to 17m3/h, they can drag acids up to 4 m of negative suction, such as sulphuric acid 98%hydrochloric acid 33%nitric acidphosphoric acidsodium hypochloritecaustic soda...

HIPPO - The HIPPO mech-sealed self-priming pumps offer capacities up to 50m3/h and are ideal for pouring operations of non-viscous liquids (such as methanolethanolsalinewith negative head up to 5 m. They can also be applied for unloading chemical products from portable tanks. Thanks to its construction with an open impeller, these thermoplastic pumps can drag clean, viscous liquids or with suspended solids

How do self-priming pumps work? 

The self-priming process allows to carry the pumped fluid by aspiring air and then by collecting the liquid.


A small quantity of liquid is trapped into the pump to enable the next starting


The impeller gives a proper circulation of liquids containing air by moving the air from the suction pipe to the discharge one in the atmosphere.


Once the air is removed, the tube is flooded with liquid, and the pumping phase starts.

Example of application

Here is a RHINO mag-drive self-priming pump installed and working efficiently in a garage to collect washing water solution laden with detergents, residues and oils - used during car washings - with capacities up to 17m3/h and negative head up to 6m.