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Repair of the GPU

Gas piston units (GPU) are a key element of power systems, providing generation of electric and thermal energy. Reliable operation of gas piston units directly affects the efficiency of the power system of the enterprise. However, like any technical equipment, gas piston units can encounter various faults that require prompt repair of the GPU engine. In this material we will consider in detail planned service actions and possible malfunctions of MWM GPU.

gas piston plant repair
gas piston plant repair

Classification of repairs of MWM gas piston units

Maintenance and repair activities are categorized into several types depending on the operating condition of the unit and the mileage (operating hours):

  • E-10 to E-40: diagnostic inspections and checks. During these stages, the condition of the main components of the GPU is checked to identify potential defects or wear. During maintenance
  • E40: according to MWM regulations oil and air filters are supposed to be replaced, spark plugs are replaced if necessary. At 8000 mth the crankcase gas filters are replaced.
  • E-50 - E-60: medium repair. Within the framework of this repair, worn assemblies and parts are replaced, ignition and fuel supply systems are adjusted.
  • E-70: major repair. This is the deepest and most complex type of repair, involving a complete disassembly of the unit, replacement of the main parts and assemblies, as well as restoring the performance characteristics of the engine.
    These categories determine the nature of the work and help plan maintenance to ensure smooth operation of the units.

GPU repair stages

The repair process of a gas piston unit includes several stages:

  1. Fault diagnosis. The initial stage consists in identifying problematic components of the unit, using specialized diagnostic equipment, and checking the engine performance indicators.
  2. Determination of the causes of the malfunction. After the detection of defects, the causes of their occurrence are analyzed. This can be due to both wear and tear of parts and operational errors.
  3. Restoration of performance. At this stage, damaged assemblies and parts are replaced or repaired, fuel supply, ignition, cooling and other critical systems of the GPU are adjusted.
  4. Testing after repair. After repair, all operating parameters of the unit are checked to make sure that the equipment is reliable and working correctly.


Causes of gas piston unit (GPU) malfunctions

Gas piston units are subject to various types of malfunctions, which can be caused by both component wear and tear and external factors such as operating conditions, fuel quality and others. The following are the most common malfunctions of gas turbine units and possible causes of their occurrence:

Component
Engine stop

Gas supply interrupted
Possible causes

The engine won't start

Gas supply interrupted
Gas shut-off elements closed, leakage, gas pressure regulator jammed

 

  Leakage

 

  Gas pressure regulator is stuck

 

Gas supply disrupted
Gas pressure too high or too low

 

Speed control is not possible
Malfunction of the actuator

 

Power supply interrupted
Power supply to switch cabinet interrupted

 

  Cable breakage

 

The camshaft speed sensor does not give a signal

Distance too far away

     Sensor or sensor cable defective
  Engine shut down by TEM system (cooling system not running) Lack of coolant
   

Leakage

    Coolant pump defective
    Coolant pump leaks
    The cooling system is contaminated
The engine won't start

Gas supply interrupted

Gas shut-off elements closed
  Power supply interrupted The power supply to the machine switch cabinet has been interrupted.
    Power supply to the starter has been interrupted
 

Ignition does not work

Spark plug defective
    Ignition wire defective
    Ignition coil defective
    Ignition control unit defective
  Engine does not turn
The starter system is defective
 

The camshaft frequency sensor does not give a signal

Distance too far away
  Flywheel frequency sensor does not signal Too much distance
Ignition skipping and irregular engine running

Gas supply interrupted

Gas shut-off elements closed
  Power supply interrupted The power supply to the machine switch cabinet has been interrupted.
    Power supply to the starter has been interrupted
 

Ignition does not work

Spark plug defective

   

Ignition wire defective

    Ignition coil defective
    Ignition control unit defective
  The motor does not turn    
The starter system is defective
  The camshaft speed sensor does not give a signal    
Too much distance
 

The flywheel frequency sensor does not give a signal

Distance is too great
The engine is overheating Gas supply interrupted
Gas shut-off elements closed
 

Power supply interrupted

Power supply to the machine switch cabinet has been interrupted
    The starter power supply has been interrupted
 

Ignition does not work

Spark plug defective
    Ignition wire defective
    Ignition coil defective
    Ignition control unit defective
 

Engine does not turn

 

 

 

 

 

The starter system is defective
  The camshaft speed sensor does not give a signal Too far away
  Flywheel speed sensor does not signal too far away Too much distance
Engine ignition is irregular
The ignition doesn't work    
Spark plug defective
   

Ignition wire defective

    Ignition coil defective
    Ignition control unit defective
 

Camshaft speed sensor signal too weak

Too much distance
    Frequency sensor defective
  Flywheel frequency sensor signal too weak     Too much distance
    Frequency sensor defective
The engine is overheating
Insufficient heat transfer (between primary and secondary heating circuit)
The heat exchanger is dirty
 

Insufficient heat transfer (secondary heating circuit)

3 way valve defective
  Insufficient cooling capacity (cooling circuit) Coolant pressure too low
    Leakage
    Coolant pump defective
    The coolant pump is not sealing properly

Table of exhaust system and supercharger faults

Leaky flange connection on the exhaust gas heat exchanger Defective gasket
   

Loose threaded connection

  Insufficient capacity of the exhaust gas heat exchanger (pressure drop)     Water side contamination of the exhaust gas heat exchanger
   

Contamination of the OH heat exchanger on the side of the OH unit

  Water leakage at the condensate connection of the exhaust gas heat exchanger when the unit is switched off Pressure vessel leaks
    Threaded connection loosened
 

Leaky flange connections of the suction air pipe

Defective gasket
    Threaded connection loosened

Cooling system fault table

Coolant pump does not work Faulty fuse
    Cable clamp is loose
    Coolant pump defective
 

Coolant pump performance is too low

Air in the cooling system
    Coolant pump connected in wrong direction of rotation
    Rotation speed is too low
    Coolant pump defective
 

Coolant pump makes noises

Initial pressure too low
    Bearing malfunction
  Engine shut down by TEM system (lack of coolant)     Lack of coolant
    Leakage
  Engine shut down by TEM (coolant temperature too high)     Lack of coolant
    Coolant temperature sensor malfunction

Table of pneumatic system faults

Pneumatic starter does not respond    Empty compressed air tank
    Valves closed
    Insufficient compressed air
    Compressed air lines clogged
    Compressed air lines are leaking Compressed air lines are leaking
    Pneumatic starter malfunction
 

Pneumatic starter does not reach the required speed

Insufficient amount of compressed air
    Compressed air lines are clogged
  Pneumatic starter rotates without thrust     Compressed air lines clogged
    Pneumatic starter malfunction
Table of coupling faults Cracks in elastomer Overloading of the coupling
    Coupling aging
    Coupling is incorrectly positioned
  Elastomer is detaching
The coupling is not correctly positioned

Generator fault table

Alternator voltage too high Incorrect nominal value set
    Incorrect measurement lines connected
    Voltage regulator defective
 

Alternator voltage fluctuations

Inconsistent engine speed
    Incorrect nominal value set
    Voltage regulator defective
 

Generator voltage cannot be increased

Setpoint adjuster or connection cable broken
  Generator does not produce voltage Excitation fuse blown
    Exciter diodes defective
 

Generator voltage drops significantly under load

Drive speed decreases under load
    Protective fuse defective
    Exciter diodes defective

Benefits of regular maintenance

Regular maintenance of gas piston units not only helps reduce malfunctions, but also extends equipment life, reduces operating costs and improves overall plant efficiency. Maintenance recommendations include routine replacement of filters, oil and other consumables, as well as periodic inspection of systems for leaks, defects and wear.

Advantages of repair from “MKS”

  • Original spare parts. Repair of gas piston units is carried out using only original spare parts. “MKS” has an operative stock of original spare parts and components supplied from manufacturing plants.
  • Qualified specialists. Repair of gas piston plants of various brands and other equipment is performed by experienced engineers who have passed certified training at the manufacturing plants. The whole staff of the MKS service department is constantly improving its qualification and undergoing technical training.
  • Minimal repair time. The extensive network of MKS branches in Russia ensures the presence of experienced specialists in different regions of the country. Together with the availability of spare parts and components that do not require additional delivery and customs clearance, this minimizes the time of GPU repair.
  • Original service tools. MKS has at its disposal special service and repair kits designed for each type of engine. Repair of plants using other tools is inadmissible, as it leads to equipment breakdown.

Emergency repairs of gas turbine units

We also carry out emergency repairs of gas piston units, which may be required if the equipment is operated incorrectly. The main causes of accidents include unqualified maintenance, use of non-original spare parts and ignoring warnings about incorrect operation of the unit. The MKS team offers prompt specialist visit, diagnostics, estimation of the scope and cost of work, as well as supply of spare parts for necessary repairs.

Conclusion

Repair and maintenance of gas piston units play a key role in ensuring their reliable and long-term operation. It is important to follow a schedule of diagnostic inspections and scheduled repairs, such as E-10 through E-70, to keep your equipment in good working order and avoid costly downtime.

© MKC Group of Companies LLC, 2024

November 12, 2024
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