Installation Checklist
The following factors must be considered before commencing the installation
•level, weight load and vibration transmission characters of the foundation
•sufficient cooling air
•sufficient fresh air intake
•cooling air exhaust
•engine emission exhaust
•electric connection
•operation and maintenance space
•noise standard
•vibration isolator
Generator Location
The Generator is located in relativity to the position of other systems such as ventilation duct, exhaust duct, wiring, fuel pipes, etc.. The Generator shall be as nearer to the main power switchgear as possible.
Foundation
Generator be attached to the concrete floor
1. If the Generator is to be attached to the concrete floor, a concrete block must be built on the floor on which the Generator will be installed.
2. The concrete block shall be a steel-reinforced concrete structure which can withstand a pressure test that lasts 28 days with a pressure strength of above 2,500 psi (173kpa) . The block rises at least 6 inches (150 mm) above the floor and extends for at least 6 inches (150mm) from every side of the Generator base frame.“J” or “L” bolts must be preinstalled to the block to anchor the Generator or vibration isolating pads.
Generator be attached to the vibration isolation foundation (VIF)
If the environment is extremely sensitive to vibration or noise, the Generator shall be fixed to a VIF to diminish vibrating impact on the building. The dynamic weight load capacity of the VIF needs to be at least twice the weight of the Generator (fuel weight in the tank may be excludedfrom the Generator weight). The following figure shows a typical VIF. The parameters are as the following:
1. The VIF shall be at least 150 to 300mm longer and wider than the Generator base frame,hence the length (L) and breadth (B) of the VIF is decided.
2. The VIF rises 20 to 300mm above the floor
The depth of the foundation is decided by the following formula: H＝K×G /d×（B＋0.4）×（L＋0.4）
d －cement density，normally 145lbs/ft³(2400 kg/m³) K－ times of the Generator weight, normally 2；
G－gross Generator weight，kg； B－breadth of the foundation，m；L－length of the foundation，m。 E.g. Generator AP900: length 4.3m，breadth 1.8m，gross weight 5800kg; Foundation depth H ＝( 2.0x 5800) / ( 2400 x 4.7 x 2.2 ) ＝0.467m
1. Certain space must be reserved along the rim of the foundation to allow for expansion at low temperature.
2. The reinforced concrete used for the foundation must withstand a 28-day pressure test at above 2,500 psi(173kpa).
3. The intensity of pressure on the floor from the total weight of the Generator, fuel and VIF shall be lower than 96kpa.
4. Generator base and vibration isolation pads are anchored to the VIF with “J” or “L”bolts.
5. When the Generator is mounted to the floor, it shall be ensured that the floor can carry 1.5 times the Generator wet weight to accommodate static and dynamic loads .Vibration dampers must be inserted between the Generator base and the floor.
Note: All foundations must be solid and smooth enough. For concrete structures, no further treatment is needed as they usually satisfy the physical requirement.
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