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Improve Pump Efficiency with Chemco


Improve Pump Efficiency with Chemco


Water Utilities



April 2017



Cast iron body



Chem-tect™ RB 364

Epo-chem™ RP 500



River Water



The pump had dropped off in efficiency due to the combination of corrosion erosion and mechanical fatigue. This was due to a poorly specified and applied coating which was delaminating allowing corrosion to exist.


Chemco’s Solution

After 8 years in service the substrate was corroded and heavily contaminated with metallic salts. Treatment using a combination of methods including abrasive blasting, hot washing and acid washing to reduce salts below 25ppm.  We then recommended the application of 2 coats of Chem-tect™ RB 364; a glass flake filled vinyl ester providing an excellent corrosion barrier and long term protection. We then applied 2 coats of Epo-chem™ RP 500 to enhance fluid efficiency in turn reducing power consumption.


On arrival ready for chamfer grinding
On arrival ready for chamfer grinding
Chamfer on split face and removal of salts
Chamfer on split face and removal of salts
Pitt-filling and intermediate coat applied
Pitt-filling and intermediate coat applied
Completion of internal lining
Completion of internal lining



Strip and assess

Manufacture template to ensure mating faces match

Grind chamfer on all flanged faces, allowing the coating to be applied on the flange face preventing future crevice corrosion.

Protect critical dimensions

Abrasive blast and treat to reduce metallic salts by hot washing and re-abrasive blast.

Apply corrosion barrier Chem-tect™ RB 364

QA included spark testing and DFT

Apply topcoat of Epo-chem™ RP 500



By coating with Chem-tect™ RB 300 & Epo-chem™ RP 500, future corrosion erosion is prevented with a reduced amount of friction through composite technology. The pump now functions more efficiently when in use consuming less power, which led to carbon credits and a reduction of greenhouse gas emissions. The payback period of the entire refurbishment worked out to be only 14 months.


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