PMS 4500 FCB Manual - Ysebaert

Maintenance Instructions
B.7 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 revolutions
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 matters. 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 mounted over the waterline")
B.7.1 Exchange of the impeller
Close the raw water stop cock.
Raw water pump on the front side of the
genset.
Page 22 PMS_4500_FCB_manual.V02 - Chapter B: Maintenance Instructions 15.7.05