Diesel generator alignment in Hai Phong
In order to obtain optimum service life from engine and its drivenequipment, correct alignment between the units is required. Improperalignment results in excessive vibration, short life of driven equipment/compound bearing and coupling clutch parts, and frequent re alignment.Good alignment practices include proper shimming, correct torque on holddown bolts, accurate laser or dial indicator usage, allowances for bearingclearances, thermal growth, and and affects other engine properties.
Diesel Generator Alignment Considerations
Parallel/Bore Misalignment: Parallel or bore misalignment occurs when centerlines of driven equipment and engine are parallel but not in the same plane
Angular/Face Misalignment: Angular or face misalignment occurs when centerlines of driven equipment and engines are not parallel.
Bore Misalignment: illustrates that misalignment can occur in more than one plane. For this reason, alignment readings must be taken at 90-degree intervals as the units are rotated
Hai Ha M&S has successfully implemented several diesel generator alignment projects in Vietnam
Below is the most recent project that we have done in Hai Phong port. a Chinese diesel generator line and very difficult to modify a lot because the generator was replaced unlike the old one.
The generator base is much higher than the diesel engine base so the surface of the generator base must be cut and grinded smoothly.
Cutting the generator base to the above position is the most suitable option, then measuring the ratio between the generator and the diesel engine.
The engine base positions are ground and polished.
After measuring the difference between the generator and the engine, 4 iron plates of the same shoe dimension were fabricated.
Use the wire to check the surface flatness of the 4 machine base positions.
The clearance should not exceed 0.05mm and the clearance of all 4 positions is about 0.02 to 0.03 and less.
Apply a thin layer of Epoxy resin before placing the iron plate.
Proper alignment of a machine can save a huge amount of money. Misalignment can cause serious problems in a machine.
During the alignment, we align the centreline of the two shafts in a straight line. On all axes both the shafts should be parallel to each.
Crankshaft bearing failure
Break down of major components.
Fatal to human beings.
Increase in downtime causing loss of production.
On board aship a breakdown due to the alignment can cause a huge loss to the shipping company.
A breakdown in Diesel generator can cause the complete black out in industry and on ships.
Before the catastrophic failure, machine will give the misalignment indications. Listed below are the major initial symptoms.
Vibration will be with heavy amplitude.
Temperature of the body will be high.
There will be frequent loosening of foundation and other bolts.
Repeated breakage of bolts
Oil / grease leakage from seals.
Coupling failure will be very high.
Bearings will get overheat.
Frequent failure of bearings
Overheating of components
Unbalanced loads on machine
The bolt used is a 12.9 high tensile cable bolt.
All bolts are tightened before aligning.
The generator base is bolted to 4 positions for easier adjustment
The dial meter is attached to the generator shaft, then rotates around the handwheel, according to the results on the dial meter at 4 positions 0, 90,180 270 degrees to align.
Since the generator was replaced with the old one, the junction box was also built new to be more suitable.
Installation new stuffing box and re-connection
Drill holes for positioning pins.
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HAI HA MARINE & SHIP REPAIR SERVICE Co.Ltd
Office: 44/82 – Vu Chi Thang Str, Hai Phong city – Viet Nam
Hotline 1 : +84 388-441-654
Hotline 2 : +84 886-441-654
Please fill free to contact us as following address for any kind of marine and repairs service for your good vessel in Vietnam.