Worn clearance rings and impeller hubs – Hale 80FC User Manual
Page 69
69
Pump Ends
p/n: 029-0020-61-0
Pr ev en tive M ain te n an ce
❑
3.
Run the standard pump test in accordance with NFPA standards to check
pump performance.
4.
“Silencer” Series Pumps rated below 750 GPM (2,839 LPM / 47 LPS) are
tested fifty (50) minutes per NFPA 1901, 14-13.2.3.2.
Run the engine to stabilize engine temperature, then run the pump for:
❑
Thirty (30) minutes at FULL capacity and at 150 PSI (10 BAR / 0.4 MPa)
❑
Ten (10) minutes at 70% capacity and at 200 PSI (14 BAR / 1.4 MPa)
❑
Ten (10) minutes at 50% capacity and at 250 PSI (17 BAR / 1.7 MPa)
5.
For Model “MBP / MG -*” Series Pumps, rated at 750 GPM and 1,000 GPM
(2,839 and 3,785 LPM / 47 and 63 LPS) a three (3) hour test is required:
❑
Two (2) hours at FULL capacity and at 150 PSI (10 BAR / 0.4 MPa)
❑
Thirty (30) minutes at 70% capacity and at 200 PSI (14 BAR / 1.4 MPa)
❑
Thirty (30) minutes at 50% capacity and at 250 PSI (17 BAR / 1.7 MPa)
Additionally, an engine overload test is required which consists of pumping
at FULL capacity and at 165 PSI (11 BAR / 1.1 MPa) for ten (10) minutes.
6.
If the apparatus does not reach performance levels, proceed to Section 5
“Troubleshooting” on page 49.
7.
Compare the results of this test to those from when the apparatus was
delivered. If the apparatus performance has dropped appreciably com-
pared to its original performance, the unit needs servicing.
Note: Apparatus test results should be on file with the delivery documents. If not,
they may be obtained from the apparatus manufacturer or from the original certifying
authority).
Worn Clearance Rings and Impeller Hubs
Before assuming that clearance ring wear is at fault or that clearance ring
replacement requires pump disassembly, it is advisable to thoroughly check
other possible causes of low performance.
Clearance rings limit the internal bypass of water from the discharge side of the
pump back to suction. The radial clearance between the impeller hub and the
clearance rings is only a few thousandths of an inch when new. In clear water,
the clearance rings continue to effectively seal for many hours of operation.