8-4
Table 8-3(b) Maintenance check list
*1: The letter “m” indicates the number of pump stages, and the letter “n” indicates the number of pumps.
Eg: UNX403-3.7-e =
cBore(40A), dNumber of stage (3 stages), eRated output(3.7kW)
cd e
*2: Long-life urea grease is used as lubricating grease in bearings.
When you replace parts, apply one of the following types of greases to each bearing.
c Bearings made by NTN: MP-1 grease
d Bearings made by NSK: ENS grease
e Bearings made by KOYO: KTC grease
Note
Information in the “Replacement cycle of consumables (as a guide)” column shows
standard values that are applicable when the unit has been properly used and
periodically inspected. The service life may be shortend depending on the operation
conditions.
Note
Waste parts and other disposal items removed during repairs or replacement must
be disposed of by a specialized contractor.
Inspection point Inspection item Method Criterion
Frequency
Replacement cycle of consumables
(as a guide)
Daily
Half-yealyr
Yearly
Consumable Qty.
Replacement
cycle
Pumps and motors
Operating conditions
Head
Visual
check
As per the specifications
䕿
Electric current value Measure As per the specifications 䕿
Noise, vibration
Listen
Touch
No abnormal condition
䕿
Rotation direction
Visual
check
Each motor rotates in the correct
direction.
䕿
Mechanical seal Water leakage
Visual
check
No water leakage
䕿
Mechanical
seal
n
Every year or
after 8000 hrs
of continuous
operation
Impeller
Clogging with foreign
matter, wear, damage
Disassem
ble and
inspect
No abnormal condition
䕿
Liner ring Wear, damage
Disassem
ble and
inspect
No abnormal condition
䕿
Liner ring m x n
*1
Every 3 years
Guide vane
Clogging with foreign
matter, wear, damage
Disassem
ble and
inspect
No abnormal condition
䕿
Main shaft and its
surrounding area
Smooth rotation
Rotate
manually
Smoothly rotates
䕿
Bearing
*2
Heat, noise, vibration Touch No abnormal condition 䕿 Bearing 2n
Every 3 years
or after 15000
hrs of
continuous
operation
Winding resistance
Resistance between wires
(U-V, V-W, W-U)
Measure
Those resistance values are the
same.
䕿
Insulation resistance
Insulation resistance
between the ground and
each lead
Measure 1 Mȍ or more 䕿
Accessories and others
Pressure tank
Pre-charge pressure Measure As per the setting pressure
䕿
Pressure
tank
1 Every 3 years
Painting conditions
Visual
check
No abnormal condition 䕿
Pressure transmitter Operation
Visual
check
Pressure is indicated correctly.
䕿
Pressure
transmitter
1 Every 5 years
Pressure gauge Check the reading
Visual
check
No abnormal condition
䕿
Pressure
gauge
1 Every 3 years
Compound pressure
gauge
Check the reading
Visual
check
No abnormal condition
䕿
Compound
pressure
gauge
1 Every 3 years
Flow switch
Operation
Visual
check
Pump stops at a low flow rate.
䕿
Clogging with foreign
matter, damage
Disassem
ble and
inspect
No abnormal condition
䕿 Flow switch n Every 3 years
High-temperature
sensor
Operation
Visual
check
High-temperature alarm is issued at
a high temperature (50°C or more).
䕿
High-tempera
ture sensor
n Every 3 years
Check valve
Clogging with foreign
matter, wear, water
leakage
Disassem
ble and
inspect
No abnormal condition
䕿 Check valve n Every 3 years
Each section of piping Water leakage
Visual
check
No water leakage 䕿
Packing and O-rings
Flaws, deformation,
adherence of foreign
matter
Visual
check
No abnormal condition
䕿
Packing and
O-rings
1 set
Whenever
disassembled
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