DARLEY ZSP, Nstallation, Operation, Maintenance, Repair And Troubleshooting Instructions

Page: 115 / 155

Prepared by: DWS Rev.: A
Approved by: MCR
2
Date:09/25/2001
Revised by: RJG 1200583.doc
Revision Date: 02/07/12
Operation and Maintenance
When operated within rated operating conditions of this pump, these seals will provide trouble free
service for extended periods.
Properly selected and applied mechanical shaft seals are leak free and require no adjustment. Should
the seal area develop a leak, investigate the cause as soon as possible. Seal failure, leakage, may be
the result of; worn seal faces, leaking bellows, or damaged o-rings. These failures may be attributed to
bearing failure, impeller blockage, impeller imbalance, seal housing contamination, operating beyond
pump design rating, or dry running,
Mechanical shaft seal design relies on the sealed media, in this case, water, to cool and lubricate the
sealing surfaces. Therefore, extended dry operation may cause overheating and scoring or damage to
the sealing surfaces, resulting in excessive leakage or a much shortened seal life.
To maximize seal life, minimize operation at pump pressures higher than pump rating. While operating
at pressures beyond rating will not immediately damage the seal, it will increase sealing surface wear
rate.
CAUTION:
DO NOT RUN THE PUMP DRY EXCEPT MOMENTARILY AND
AT LOW SPEEDS
CAUTION:
DO NOT USE THIS PUMP FOR HOSE TESTING
CAUTION:
THE MECHANICAL SEAL SHOULD NOT BE RUN DRY, WHILE
THE PUMP IS NOT ENTRAINED WITH WATER, FOR A PERIOD
LONGER THAN 2 MINUTES. FAILURE TO FOLLOW THIS
RECOMMENDATION WILL LEAD TO PREMATURE WEAR AND
FAILURE OF YOUR MECHANICAL SHAFT SEAL.