Met-Pro Fybroc 5500 series, Руководство по установке

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6
trOuble checK list
Refer to the following diagnostic section if
hydraulic problems are encountered in the pump
operation.
PROBLEM: No liquid delivered.
CHECK: Priming, casing is not completely
filled; no liquid in pit; insufficient
submergence.
Speed too low. (Result reduced
TDH.)
Impeller eye or suction strainer is
completely plugged.
PROBLEM: Not enough liquid delivered.
CHECK: Cavitation.
Air leakage through suction
tailpipe.
Speed too low.
Impeller and strainer are plugged.
Impeller clearance too great.
Impeller is damaged.
PROBLEM: Not enough pressure.
CHECK: Cavitation.
Air or gases in liquid.
Impeller diameter too small.
Impeller clearance too great.
Impeller is damaged.
PROBLEM: Pump works awhile, then stops.
CHECK: Float controls.
Insufficient submergence.
Air or gases in liquid.
Impeller eye or strainer plugged.
PROBLEM: Pump takes to much power.
CHECK: Speed too high.
Head is lower than rating; pump-
ing beyond design point.
Liquid heavier than specified;
check viscosity and specific
gravity.
Rotating element binds.
Impeller binding; check clearance.
Check line voltage to motor.
PROBLEM: Pump is noisy.
CHECK: Pump is cavitating.
Pump is running close to shut-off.
Shaft is bent.
Rotating parts bind, are loose or
broken.
Bearings are worn out.
Pump and drive misaligned.
Check lock collar on the discharge
pipe to be sure it is not putting
stress on discharge pipe, causing
distortion of pump casing, and
thus bending of shaft and column.