In recent years, the application of the LNG storage tanks is widely used in the industrial production process. The low-temperature liquid market is booming, liquid oxygen, liquid argon, liquid nitrogen, carbon dioxide, LNG sales increase substantially, liquefied natural gas storage tanks for liquefied natural gas storage of weld and thermal impact zone surface should not crack, porosity, slag, pit, not weld full defects.
The persistence of the vacuum degree of low temperature reservoir interlayer is the fundamental guarantee for the normal operation of the tank. When the tank starts to use, the common problems often affect the normal operation of the tank, and the low temperature storage tanks often encounter problems.
1, when the low temperature tank outside the emergence of a large area of "sweating" or "frost."
2, the low temperature storage tank has abnormal pressure rise, the safety valve appears to take off phenomenon.
3, the evaporation of low temperature storage tank is abnormal, and the vacuum degree is small.
4. "Sweating" appears at the top of the outer barrel of the cryogenic storage tank.
Liquefied natural gas storage tanks should be inspected promptly, troubleshooting, timely maintenance. The working pressure, the rapid change of medium, the temperature of the medium or the wall temperature exceeds the allowable value, and the measures still cannot be effectively controlled; cracks in the main compression components occur, the defects of the bulge, deformation, leakage, etc. endanger safety; the liquefied natural gas storage tank carries on the industry construction takeover, the fastener is damaged, it is difficult to guarantee the safe operation; excessive charging; the pressure vessel and the piping are severely vibrating and endanger safe operation. The occurrence of fire directly threatens the safe operation of pressure vessels.