How to Installation Diesel Generators of Fuel Supply

The technical standards for diesel generator sets outlined in this document apply to the installation and commissioning of single or interconnected fixed Open Diesel Generator Set and their ancillary equipment in general industrial and civil construction electrical installation projects. The continuous power range of the diesel generator sets is 100~2000KW. The requirements and standards listed are particularly suitable for the construction of diesel generator sets located on the ground floor, intermediate floors, rooftop, basement, or podium of buildings.

I. Fuel Supply System Installation

Cummins provides corresponding standard fuel tanks and supply systems for different Automatic Standby Diesel Generator for customers to purchase. Alternatively, base-mounted tanks can be designed according to customer requirements, or various capacities of separate tanks can be designed. Customers may also design their own tanks. However, regardless of the tank type, its installation design must adhere to the following principles:

(1) The fuel tank location must be safe to prevent fire hazards. The tank or barrel should be placed separately in a visible area, appropriately distanced from the generator, and smoking must be strictly prohibited. It should be kept away from exhaust pipes, heat sources, and vibration sources. This is because diesel fuel can vaporize at temperatures above 65°C, preventing the diesel engine from operating properly; and vibration can stir up sediment, causing fuel line blockages and wear.

(2) After placement, the highest fuel level must not exceed 2.5 meters above the generator set base. If the fuel level in a large tank is higher than 2.5 meters, a day tank must be installed between the large tank and the generator set. Fuel must not be allowed to flow into the diesel engine by gravity through the fuel supply line or injection line, even when the diesel engine is shut down. The lowest fuel level in the tank should not be less than 1 meter above the fuel transfer pump inlet. The fuel supply port to the diesel engine should be at least 100mm above the tank bottom to prevent sediment and water from being drawn into the engine.

(3) During fuel system installation, the key is to ensure there are no diesel leaks (during both operation and shutdown). Diesel leaks can allow air into the fuel system, causing unstable engine operation. Use high-quality hose clamps for connecting hoses; do not use wire ties, as they may loosen or cut the hose. Fuel lines can be made of black iron pipe or flexible steel wire braided hose; galvanized pipe must not be used. The connection of the fuel return line should not create shock waves in the fuel line.

(4) Installing a fuel-water separator can yield significant economic returns. Water in the fuel is highly detrimental to the engine in two ways:

first, it causes rust;

second, when it turns to steam, it can damage injectors and reduce precision. Since water continuously condenses in the fuel tank, completely isolating it is impossible. Therefore, a fuel-water separator is necessary.