Masdaf NMM Series, Руководство по эксплуатации

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KYP Serisi
10
7.4. Shut Down Procedure
CAUTION
During sudden start ups and stops, a pressure reducing
valve must be placed at the exit section of high flow rate
pumps whose discharge pipelines are long, in order to
reduce water hammer effect. Water hammer may
explode the pump.
In normal conditions (apart from sudden power shut
down, etc), stop the pump as below:
• Close the discharge valve slowly
• Switch the power off, stop the motor. Notice that the
rotor slows down.
• Do not start up the motor at least before 1 to 2 minutes.
• If the pump will be out of use for a long time, close the
suction valve and auxiliary circuits. If the pump is
outside and if there exists a danger of frost, remove all
drain taps and empty all the water inside the pump. (5.2.
Storage) .
CAUTION
If the pump is outside and if there exists a danger of
frost, remove all drain taps and empty all the water
inside the pump.
8. MAINTENANCE
CAUTION
Maintenance operations must be done by authorized
personnel with protective clothing only. The personnel
must also beware of high temperatures and harmful
and/or caustic liquids. Make sure that the personnel
read carefully the manual.
• The instructions in Safety Precautions must be
executed during maintenance and repair
• Continuous monitoring and maintenance will increase
the engine’s and pump’ s lives.
The instructions below should be applied.
8.1. The Checks During the Operation
• Pump must never be operated without water.
• Pump must not be operated for a long time with the
discharge valve closed (zero capacity).
• Precautions must be taken against flare up when the
component temperatures are over 60°C. “Hot Surface”
warnings must be placed over necessary areas.
• All the auxiliary systems must be in use while the
pump is operating.
• If the pump has mechanical sealing, there is no need
for excessive maintenance. Water leakage from the
mechanical sealing indicates the fact that the sealing is
worn out and therefore needs to be replaced.
• If the system consists of a substitute pump, keep it
ready by operating it once a week. Check also the
auxiliary systems of the substitute pump.
The air of the pump and suction line must be drained
before commissioning of the pump. The interior of the
pump contacting with pumped liquid including gasket
way and auxiliary systems must be filled with pumped
liquid.
• Ensure that delivery pressure is enough.
• Do not operate the pump at values above pressure,
temperature or motor speed values specified by
manufacturer, never use improper liquids with the
pump.
8.1.1. Component Check
CAUTION
To make possible the visual control, one must be able
to reach the pump from any direction. Especially, to be
able to dismount the internal units of the pump and the
engine, sufficient free space must be created around
them for maintenance and repair. Furthermore, one
must make sure that the piping system can easily be
dismounted.
8.1.2. Bearing and Lubrication
Rolling bearings are not used in NMM type pumps.
Motor bearing is enough for countervailing all axial and
radial forces. Motor bearings are provided with lifelong
heat resistant grease.
8.1.3. Mechanical Seals
Mechanical seals are used at NMM type pumps.
Mechanical seals are absolutely leak tight and needs
less maintenance than soft packing.
Mechanical seal;
1. Provides leak proof operation in heavy operating
conditions (in waste water pumps, chemical process
and refinery pumps).
2. Easily mountable and needs less maintenance.
3. Does not cause wearing on the shaft
4. Sealing operation does not depend on the quality
of shaft finishing.
8.1.4. Drive
Apply to the operating instructions of the motor
manufacturer.
8.1.5. Auxiliary Components
Check regularly the fittings and the gaskets, replace
the worn out pieces.