Fischer Panda 6500 PMS, Руководство пользователя

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Maintenance Instructions
Seite/Page 136 Panda PMS 8.000 NE - 42 NE Manual.R05 - Kapitel/Chapter 6: Maintenance Instructions 22.3.11
6.13 The seawater circuit
6.13.1 Cleaning the seawater filter
Fig. 6.13.1-1: Seawater Filter
Residue should be regularly removed from the seawater filter.
The seacock must, in each case, be closed first. It often suf-
fices to merely hit the filter punnet.
If water should seep through the cover of the seawater filter, this may never
be sealed with adhesive or sealant. The cause for the leakage must be sou-
ght. The sealing ring between caps and filter holders must be exchanged in
the simplest cases.
Sample picture
6.14 Reasons for frequent impeller wear
1. Unreasonable operating conditions
The Cooling water pump Impeller must be regarded as a wearing part. The life expectancy of an impeller can vary
considerably and depends exclusively upon the operating conditions. The Fischer Panda Generator cooling pumps
are designed in a way, that the speed of the pump in comparison to other generators is relatively low. This has a
positive effect on the life expectancy of the pump.
2. Longer Suction Distance of Cooling Water
If the cooling water suction distance is long, or is blocked, this has a negative effect on the impeller, so that an under-
pressure occurs in the cooling water suction area. This can reduce the efficiency of the impeller and place strain on
the blades. This can greatly reduce the life expectancy.
3. Operating in contaminated waters
The impeller is placed under great strain in waters with high contamination. The use of the impeller in coral waters is
also critical. There are known cases, where the impeller was so fatigued after 100 hours use, that the lip seals were
grinded away by the shaft. In these cases sharp crystal parts from the coral press into the rubber seals and act as a
grinding material on the stainless steel shaft of the impeller pump.
4. Generator mounted above the water level
It is especially disadvantageous for the impeller pump, if the generator is mounted above the water level. This
means that a few seconds will pass before the impeller can suck in cooling water. This short dry running period
damages the impeller. The increased wear can also lead to a breakdown. (See special instruction: "Effect on the
impeller pump, if the generator is mounted above the water line").