Preparation for starting the diesel fire pump
The diesel engine fire pump is much more complicated in structure than the electric water pump, so the preparation work before starting is also more complicated.
First, we should first check if the display of the voltmeter on the control cabinet is 24V. If it is lower than 24V, we should promptly find out the cause and eliminate the fault. Second, check whether the diesel engine parts are normal, whether the accessories are reliably connected, and eliminate the abnormal phenomenon. Third, check whether the oil in the oil pan, the fuel injection pump and the governor reaches the specified oil level. If the oil is found to be insufficient, the same type of oil should be added. Fourth, check if there is enough water in the water tank. If an open circulation cooling system is used, the water source should be turned on. Fifth, use the hand pump on the fuel pump to inject fuel into the fuel system, and at the same time loosen the bleed screw on the fuel pump to remove the air from the fuel system. When there is no more gas to be removed here, tighten the screw. Then continue to pump oil until the return line has oil return, and finally tighten the hand pump. Sixth, sequentially loosen the high-pressure oil pipe joint nut on each cylinder injector, place the governor handle in the diesel engine running position, turn on the diesel engine, and discharge the air in each high-pressure fuel pipe (this step can be ignored in general, should not be ignored when it fails.) Seventh, for the new machine or unused diesel engine parked for more than 5 days, turn the crankshaft 3 to 5 revolutions before starting. Eighth, there is a preheating start device, and when preheating is required (temperature below 5 °C), it should also check whether the glow plug is normal (the rated voltage of 24V preheater under normal conditions is about 0.025Ω, 12V Smaller).
Inspection of diesel engine fire pump
In order to improve the ability of the diesel fire pump to respond to fire signals, it is recommended to inspect it once a week. Taking into account the water hammer effect and the characteristics of the diesel engine itself, we should start the diesel engine at low speed during the inspection, and then slowly accelerate to the speed required for fire protection – 1500r/min-3000r/min. When the water temperature and oil temperature reach 60 °C, it can be gradually decelerated, but it needs to run at idle speed (300~750r/min) for 2~3min before stopping, so as to avoid the supercharger bearing seizing due to overheating of the supercharger during the sudden stop. !
After parking, be sure to adjust the speed to 1500r/min-3000r/min for fire protection.
Because the inspection process of diesel engine fire pump is more complicated, if there is no special request from customers, we will not consider automatic inspection in the design process. It is recommended that users use manual inspection mode!
Daily management of diesel engine fire pump
To ensure the reliability of the entire control system, perfect daily management is inseparable. Although the diesel engine fire pump has a high degree of automation, the human damage factors cause it to lose function frequently! The components are damaged or lost, the parameters of the time relay and the charger are incorrectly modified, etc., the user has reflected! The key to the room must be managed by a special person, and it is necessary to regularly check whether the parts of the equipment are lost or damaged by other factors and whether the parameters of each component are scientific and reasonable.