Grundfos SE1 50 Notice D'installation Et De Fonctionnement page 34

8.1 Maintenance
Explosion-proof pumps must be
checked by an authorized Ex workshop
after 3000 working hours or at least
FM
once a year. When the pump is new or
after the replacement of the shaft seal,
check the oil level and water content
after one week of operation.
After a short period of storage, vent the
FM
pump to let any explosive gasses
escape.
Pumps running normal operation must be
inspected every 3000 operating hours or at least
once a year. If the pumped liquid is muddy or
sandy, inspect the pump at shorter intervals.
Pumps with sensor offer the possibility of constant
monitoring of key components in the pump, such
as shaft seal condition, bearing temperature,
winding temperature, insulation resistance, and
moisture in the motor.
Check the following:
• Power consumption: See on the nameplate.
• Oil level and condition: When the pump is
new or its shaft seal has been replaced, check
the oil level and water content after one week
of operation. If there is more than 20 % extra
liquid (water) in the oil chamber, the shaft seal
is defective. The oil must be changed after
3000 operating hours or once a year.
• Cable entry: Make sure that the cable entry is
watertight and the cable is not sharply bent or
pinched.
• Pump parts: Check the pump parts for
possible wear. Replace the defective ones.
• Ball bearings: Check the shaft for noisy or
heavy operation (turn the shaft by hand).
Replace the defective bearings. A general
overhaul of the pump is usually required in
case of defective ball bearings or poor motor
function. This work must be carried out by
Grundfos or an authorized service
workshop. Bearings are lubricated for a
lifetime.
Defective bearings may reduce the
FM
Ex safety.
• O-rings and similar parts: During service or
replacement, make sure that the grooves for
the O-rings and the seal faces have been
cleaned before the new parts are
fitted. Grease O-rings and recesses before
assembly.
Do not reuse rubber parts.
• Sensors.
34
Related information
2.4.1 Nameplate
8.1.2 Oil check and change
8.1.3 Cleaning and inspecting the pump