Requirements for Generator Set Vibration Damping Systems, Radiators, and Exhaust Mufflers
Couplings and Vibration Isolation Devices
1. Diesel engines must be directly shaft-coupled to single-bearing generators. When connecting to double-bearing generators, a high-elastic coupling must be used. Low-voltage and medium-voltage diesel generator sets above 1500 kW must be connected via high-elastic couplings.
2. Spring-type vibration isolators must be installed beneath the base plate, ensuring the entire assembly rests on the concrete floor slab without transmitting vibrations to adjacent equipment or any part of the building. Engine-to-generator connection configurations and vibration reduction measures for units from various manufacturers.
Radiator
The following are relevant requirements from the technical specifications for air-cooled and water-cooled units. Users should select one of the corresponding unit types that meets the requirements based on the actual project conditions.
1. Air-Cooled Units
(1) The engine must be air-cooled by a matched radiator.
(2) The radiator must be mounted on a specially designed and approved bracket.
(3) The radiator must be equipped with flange connections for ductwork, enabling the ducts to attach to the radiator. A section of ducting with a flexible connector must be installed between the radiator and the metal louvers. Ducting must be constructed from galvanized thin-gauge steel sheet. All duct connections must be sealed. (4) Fans shall have sufficient capacity, accounting for additional resistance from airflow through ducts and louvers.
2. Water-Cooled Units
(1) Engines shall be water-cooled by a matched radiator assembly, including a belt-driven fan, coolant pump, thermostatically controlled liquid-cooled exhaust manifold, intercooler, and corrosion-resistant coolant filter suitable for local conditions.
(2) The radiator must be mounted on a specially designed and approved bracket. (3) The radiator must be equipped with flange connections for ductwork to attach ventilation ducts. A section of ducting with a flexible connector must be installed between the radiator and the metal louvers. Ducting must be constructed from galvanized thin-gauge steel. All ductwork must have sealed joints.
(4) Fans must have sufficient capacity, accounting for additional resistance from airflow through ducts and louvers.
(5) A corrosion inhibitor must be added to the cooling system.
(6) The cooling system must be equipped with a coolant heater to maintain coolant temperature above 20°C, ensuring easy startup when required. Antifreeze must also be added to the cooling system.
Exhaust Pipe Silencers and Ducts
(1) The exhaust system consists of silencers, expansion bellows, suspension rods, ducts, pipe clamps, connecting flanges, heat-resistant joints, and other components.
(2) Flanges with heat-resistant connectors must be used for all connections within the exhaust system.
(3) A carbon steel or stainless steel expansion joint must be connected after the muffler. The bellows shall vertically discharge flue gases upward to the position indicated in the diagram. Exhaust pipes must be fabricated from black steel pipes, carbon pipes, or stainless steel pipes compliant with national standards, or from stainless steel welded flue pipes meeting national specifications and manufactured by specialized factories.
(4) Elbows in the exhaust pipe must have a minimum bend radius equal to 3 times the pipe diameter, subject to meeting the backpressure requirements of the diesel generator set.
(5) The entire system from the exhaust outlet to the end of the exhaust pipe, except for the stainless steel expansion bellows, must be coated with heat-resistant paint.
(6) The entire exhaust system shall be wrapped with a non-combustible insulation layer conforming to national standards over galvanized metal mesh. The mesh aperture and insulation thickness must also meet national standards. The surface temperature of the exhaust pipe with insulation shall not exceed 70°C.
(7) All exhaust ducts and mufflers shall be clad with aluminum or stainless steel sheathing of no less than 0.8mm thickness.
(8) The entire system shall be suspended by spring hangers. The design of suspension hangers must be approved.
(9) The maximum permissible smoke color at the exhaust outlet shall not exceed one degree on the Ringelmann scale, and the particulate matter emission concentration shall not exceed 80mg/m³. Compliance with local environmental protection regulations is required.
(10) Pollutant gases emitted by diesel generators, including sulfur dioxide, nitrogen oxides, carbon monoxide, and hydrocarbons, must meet the requirements of GB 20426-2006 and achieve Euro II or higher emission standards.