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8. Maintenance schedule
WARNING
Crushing hazard
Death or serious personal injury
‐
During maintenance and service, including transporta-
tion to service workshop, always support the pump us-
ing lifting chains or place it in horizontal position to
secure stability.
DANGER
Electric shock
Death or serious personal injury
‐
Before starting any work on the product, make sure
that the power supply is switched off and that it cannot
be switched on unintentionally.
DANGER
Electric shock
Death or serious personal injury
‐
Make sure the pump is earthed.
The maintenance and service work on explosion-proof
pumps must be carried out by Grundfos or a Grundfos-au-
thorised service workshop.
Do not open the pump if the ambient atmosphere is explo-
sive or dusty.
Maintenance and service must be carried out by qualified persons.
Before carrying out maintenance and service, make sure that the
pump is thoroughly flushed with clean water. Rinse the pump parts
after dismantling.
Pumps running normal operation must be inspected every 2000
operating hours or at least once a year. If the pumped liquid is
muddy or sandy, the pump must be inspected every 1000 operating
hours or every six months.
Frequency converter operation may reduce the lifespan of
the bearings and the shaft seal, depending on operating
mode and other circumstances.
Check the following:
•
Power consumption.
•
Motor liquid level.
When the pump is new or after replacement of the shaft seals,
check the motor liquid level and its water content after one week of
operation. If the motor liquid level has dropped, the shaft seal may
be defective.
Disposal of the motor liquid must comply with local regula-
tions.
50 Hz
Power
Genera-
(P2)
Num-
tion
[kW]
ber of
poles
st
nd
2
All
All
1
, 2
st
nd
4
All
All
1
, 2
st
All
All
1
st
nd
11, 13
All
1
, 2
6
Extra
st
nd
16, 18
low
1
, 2
pressure
Quantity of
Motor liquid
Head
Impeller
Class
Type
SE [l]
SL [l]
All
12.5
4.1
All
12.5
4.1
Single S-
13.8
5.1
tube
Dual S-
12.5
4.1
tube
Dual S-
13.8
5.1
tube
60 Hz
Gen-
Power
Head
era-
(P2)
Num-
Class
tion
[kW]
ber of
poles
st
1
,
2
All
All
nd
2
st
1
,
4
All
All
nd
2
st
1
,
All
All
nd
2
6
st
All
All
1
•
Cable entries Make sure that the cable entries are waterproof
and that the cables are not sharply bent or pinched.
•
Impeller clearance Check the impeller clearance and adjust if
necessary.
•
Pump parts Check the pump housing and other parts for
possible wear. Replace defective parts.
•
Ball bearings Check the shaft for noisy or heavy operation (turn
the shaft by hand). Replace defective ball bearings. A general
overhaul of the pump is usually required in case of defective ball
bearings or poor motor function.
Replace the ball bearings at least every 25.000 oper-
ating hours.
Defective ball bearings may reduce Ex safety. On Ex-
approved pumps, the ball bearings can only be re-
placed by an Ex-approved service workhop.
.
•
Leakage chamber The leakage chamber must be emptied
every 3.000 operating hours or once a year.
- For SL pumps, remove the leakage chamber plug (pos.
193a) to empty the chamber.
- For SE pumps, remove the middle seal housing (pos. 58) to
empty the chamber.
•
Measure insulation resistance Measure the insulation
resistance at 500 V minimal voltage, by a megger. The
insulation resistance measured must be minimum 50 kΩ.
•
Mechanical tightness test
Always lubricate O-rings before fitting.
Always lubricate the impeller screw with anti-seize paste.
Never reuse a worn shaft seal.
Never reuse rubber parts.
Related information
13. Components and material specification
8.1 Maintaining the explosion-proof SE, SL pumps
Overhauled and repaired explosion-proof pumps are marked with a
repair plate providing the following information:
•
repair symbol R
•
name or registered trademark of the repairing workshop
•
workshop reference number relating to the repair
•
date of overhaul or repair.
Quantity of Motor Liq-
uid
Impel-
ler
Type
SE [l (qt)]
SL [l (qt)]
All
12.5 (13.2)
4.1 (4.3)
All
12.5 (13.2)
4.1 (4.3)
Dual
12.5 (13.2)
4.1 (4.3)
S-tube
Single
13.8 (14.5)
5.1 (5.3)
S-tube
13
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