Maintenance Instructions
Page 20 Panda PMS AGT-DC 4000 - Chapter B: Maintenance Instructions
B.7.2 Causes with frequent impeller waste
The impeller of the cooling water pump must be regarded as wearing part. The life span of the
impeller can be extremely different and exclusively depends on the operating conditions. The
cooling water pumps of the PANDA generators are laid out in such a way that the number of revo-
lutions of the pump lies low compared with other aggregates. This is for the life span of the pump
a positive effect.
Unfavorably affects the life span of the impeller, if the cooling water sucking in way is relatively
long or the supply is handicapped, so that the cooling water sucking in range develops a negative
pressure. This can reduce first of all the power of the cooling water pump extremely that the
wings of the impeller are exposed to very strong loads. This can shorten the life span extremely.
Further the operation of the impeller pump loaded in waters with a high portion of suspended mat-
ters. The use of the impeller pump is particularly critical in coral waterbodies. Cases are well-
known, which a impeller pump had so strongly run after 100 hours already that the lip seal on the
wave was ground in. In these cases sharp crystal parts of the coral sand assess in the rubber
seal and affect like an abrasive the high-grade steel shank of the impeller pump.
If the generator were mounted over the water level it is particularly unfavorable for the impeller
pump. After the first start some seconds will pass by, until the impeller can suck in cooling water.
This short unlubricated operation time damages the impeller. The increased wear can lead after
short time to the loss. (see special notes: "Effects on the impeller pump, if the generator is moun-
ted over the waterline").
B.7.3 Exchange of the impeller
Close the raw water stop cock.
