What are the faults of nitrogen compressors

Once the compressor experiences oil or water cut-off, the control system will issue an alarm indication and delay the shutdown to protect the nitrogen compressor. When the tertiary exhaust temperature and pressure exceed the set value, the system will also emit an alarm sound to remind operators to promptly eliminate the problem and avoid safety accidents; Enlarge or even reach 3mm or more, and the right angle of the ring groove has been worn to an angle. So, the piston body was sent to the lathe for further processing of the guide ring groove, and at the same time, Unijie compressor service personnel were contacted to add a widened non-standard guide ring. Due to the widening of the guide ring, the axial clearance is appropriately enlarged by 0.1-0.2mm compared to the standard, allowing for the continued use of the piston body. It is recommended to reserve one piston body at all levels. If a problem with the guide ring is found during routine inspection and a new one needs to be hot sleeved, the spare piston body can be directly used. According to the operating procedures, the hot sleeved guide ring requires a long furnace cooling process. Replacing the new piston body can save maintenance time and ensure that the spare machine is in good condition.

After running for over 6000 hours, the nitrogen compressor experienced abnormal inter stage pressure: the first stage exhaust pressure and temperature were on the high side, and then decreased again. During the shutdown inspection, there were stainless steel metal plates inside the secondary intake valve, and stainless steel fragments were squeezed on the upper and lower end faces of the secondary piston body. There are stainless steel elastic rings in the grooves of the piston rings of the machine's piston body. At this time, only 2.4-4.3mm of the three piston rings in the second stage are left (the new ring is 13mm, with a minimum radial thickness of 7mm). Due to severe wear of the piston ring, the elastic ring in its groove is worn out against the cylinder wall, causing the elastic ring to break into fragments and cause internal leakage in the gas valve. By polishing the piston body and cylinder wall, replacing the second and third stage piston rings, inspecting the gas valves at all levels, removing the elastic rings at all levels, and restoring normal use, the elastic rings on the Unijie oxygen compressor were removed and no longer used.

During the operation of the compressor, the temperature of the third stage exhaust increased abnormally. Upon on-site inspection, the first stage piston rod did not move up or down, and the second and third stages were normal. During the shutdown inspection, a cylinder collision accident occurred at the first level: one fixing bolt of the connecting rod big end bearing was broken, the piston stroke increased beyond the limit, the aluminum piston body was shattered, the cylinder head was hit, cracks and water seeped, and the connecting rod was broken. So the machine underwent a complete disassembly and overhaul, replacing the first stage piston body, connecting rod, damaged main bearing, large end bearing, connecting rod bolts, etc. The unit was re aligned and finally returned to service. Air valve malfunction. In daily inspections, it is possible to touch the suction valves at all levels by hand. If hot hands or significantly high temperatures are found, the gas valve may have internal leakage. If the valve is shut down, it needs to be disassembled and inspected. Generally, the problem is caused by the valve plate breaking or falling off, or the valve plate is worn and not tightly sealed, and the valve cover is loose, which can also cause internal leakage and abnormal noise. The failure of the suction and exhaust valves in this stage can cause an increase in the exhaust pressure and temperature of the previous stage.

Unijie provides customers with industrial equipment such as screw air compressors, oil-free compressors, nitrogen compressors, sulfur hexafluoride (SF6) compressors, helium compressors, medium and high pressure air compressors. We not only provide customers with air compressors, but also provide solutions for oil-free compressed gas systems.