42
AF (6-36) IOM
Pump Troubleshooting
PROBLEM
PROBABLE CAUSE
REMEDY
Pump not primed or prime lost, liquid level does not completely fill elbow
Fill system piping completely so the impeller is submerged
Suction inlet clogged
Remove obstructions from pump inlet
Impeller clogged with foreign material
Back flush pump or manually clean impeller
Suction and /or discharge valve closed or clogged
Open valves to remove shut-off condition
No liquid delivered or
intermittent flow
Wrong direction of rotation
Change rotation to concur with direction indicated by the arrow on the
bearing housing
Suction piping incorrect
Replace or modify suction piping
Insufficient NPSH available
Increase liquid level or lower pump
Air leak in suction line
Test suction piping for leaks
Speed (rpm) too low
New drive or gear box to obtain higher pump speed
Excess air entrapped in liquid
Install vent in piping or eliminate air source
Impeller partly clogged
Back flush pump or manually clean impeller
Insufficient suction head
Fill system piping so the liquid level is above the pump impeller centerline
Pump not primed or prime lost, pump does not completely fill elbow
Fill system piping completely so the impeller is submerged
Suction and/or discharge valve closed or clogged
Open valves to remove partially blocked condition
Suction piping incorrect
Replace or modify suction piping
Pump not producing rated flow
or head
Excessive air entrapped in liquid
Install vent in piping or eliminate air source
Speed (rpm) too low
New drive or gear box to obtain higher pump speed
Incorrect rotation
Check motor wiring
Incorrect impeller or impeller diameter
Check vane angles and/ or impeller clearances
System head too high
Check system curve calculations, reduce system resistance
Instruments give erroneous readings
Check and calibrate instruments, replace if necessary
Worn or broken impeller, bent vanes
Inspect and replace if necessary
Pump assembled incorrectly
Compare pump assembly to instruction manual
Insufficient NPSH available
Increase liquid level or lower pump
Wear of internal wetted parts
is accelerated
Chemicals in liquid other than specified
Analyze pumpage and correct or change pump wet end materials to suit
pumpage composition
Pump assembled incorrectly
Compare pump assembly to instruction manual
Higher solids concentration than specified
Analyze pumpage and correct or change pump wet end materials to
harder composition
Packing gland improperly adjusted
Tighten gland nuts
Excessive leakage
Stuffing box improperly packed
Check packing and re-pack box
from stuffing box
Worn mechanical seal parts
Replace worn parts
Overheating mechanical seal
Check lubrication and cooling lines
Shaft sleeve scored
Re-machine or replace as required
Pump run off design point
Check head and flow, AF’s should be run at <75% BEP > 115%
Packing has short life
Shaft/shaft sleeve worn
Replace shaft or shaft sleeve if necessary
Packing gland not properly adjusted
Replace packing and readjust gland as specified in the operating manual
Packing not properly installed
Check head and flow, AF’s should be run at <75% BEP > 115%
Pump not assembled correctly
Compare pump assembly to instruction manual
Table 4
Содержание Goulds Pumps AF
Страница 1: ...Installation Operation and Maintenance Instructions Model AF 6 36 MXR Bearings ...
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Страница 32: ...28 AF 6 36 IOM ...
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Страница 66: ...62 AF 6 36 IOM AF SECTIONAL shown with optional restrictor bushing adapter Fig 77 ...
Страница 68: ...64 AF 6 36 IOM AF OPTIONS Fig 78 351 370F 126 ...
Страница 69: ...AF 6 36 IOM 65 MXR BEARING CONFIGURATIONS 1MXR 3MXR 4MXR 6MXR Fig 79 540C 6 ...
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