Chemical Pump Maintenance

Related Vendors

Lutz Pumpen GmbH

EagleBurgmann Germany GmbH & Co. KG

EDL Anlagenbau Gesellschaft mbH

Griswold Pump Company

What to Look Out For

Whenever pump parts need to be replaced, treat the repair as an opportunity to examine the rest of the pump for signs of fatigue, excessive wear and cracks. Replace any worn parts that do not meet the following standards:

Bearing frame and foot: Check for cracks, roughness, rust or scale. Check machined surfaces for pitting or erosion.

Bearing frame: Inspect tapped connections for dirt. Clean and chase threads as necessary. Remove all loose or foreign material. Check that oilways are open.

Shaft and sleeve: Check for grooves or pitting. Check bearing fits and shaft runout, and replace the shaft and sleeve if worn or if the tolerances are greater than 0.05 mm (0.002 in.).

Casing: Look for signs of wear, corrosion or pitting. The casing should be replaced if wear is deeper than 4 mm (1/8 in.). Check gasket surfaces for irregularities.

Impeller: Check for wear, erosion or corrosion damage. If the vanes are worn more than 4 mm (1/8 in.) deep, or bent, replace the impeller.

Frame adapter: Look for cracks, warping or corrosion damage and replace if any of these conditions are present.

Bearing housing: Check for wear, corrosion, cracks or pits. Replace housings if worn or out of tolerance.

Seal chamber/stuffing box cover: Check for cracks, pitting, erosion or corrosion, paying special attention to any wear, scoring or grooves on the chamber face. Replace if worn more than 4 mm (1/8 in.) deep.

Shaft: Inspect for corrosion and wear. Check straightness: the maximum total indicator reading (TIR) at the sleeve journal and coupling journal should not exceed 0.05 mm (0.002 in.).

Implementing all of these recommendations may seem daunting, but a proactive maintenance routine will help to avoid unplanned downtime due to pump failures, improve safety and protect the environment.

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