... Description Standard Configuration of Natural Gas Generating Set: Engine: 1,water cooling , 4 stroke 2,ratiation with water tank ... ,Protection -- IP22 (IP23 in marine) 3,AVR(auto voltage regulation) Control System: Key starting,Auto control panel,Remote ... should be less than 0.005 mm, dirty contents should be not larger than 0.03 mg/m3, Standard condition of natural gas volumes must be 101.3 kpa, 20 ...