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Warman Pump Sleeve Failure

Problem Description

The user is facing frequent sleeve failure in Warman slurry pumps, leading to bearing failure. The pump handles copper slurry with a pH of 1.5. The pump model is 4/3 CCAH Warman.

The user is also seeking information on the best gland packing material for pump sealing in this slurry application.

Initial Suggestions and Responses

Contact Warman directly for suggestions.

Warman suggested Dyna Seal and expeller arrangement, which is not immediately feasible.

Material and Corrosion Considerations

With a pH of 1.5, SAF2507 (Super Duplex) should be used, especially if high Chlorides are present. SAF2205 (Duplex) sleeves may be corroding, resulting in pitting and black powder.

Packing and Installation

The issue could be a combination of sleeve material, packing selection, and how the packing is installed, adjusted, and maintained.

Important factors include clean seal flushing water, correct lantern ring position, and avoiding over-tightening the packing.

Seal Flush Water

Seal flush water is used for gland cooling.

Seal water is actually for packing lubrication and should leak a few drops a minute.

Over-tightened packing or incorrect assembly can cause problems.

Flush Water Design

Flush water pressure should be 5 to 10 psi higher than the pressure in the casing.

Check the flush water pipe for regulators restricting flow.

Check the flow meter against Warman's table for minimum flow rates.

Packing Condition and Maintenance

Burnt and glazed packing indicates over-tightening and insufficient flushing water.

Replace damaged sleeves.

Ensure sufficient seal water pressure, correct lanteren ring position, and avoid over-tightening the gland follower.

Stuffing Box Condition

Check the stuffing box condition (inner diameter) and the center of the shaft compared to the center of the stuffing box.