After sales service of air separation equipment

A user of DEAR air separation reflected that when the air separation plant was put into operation, a large liquid nitrogen storage tank was equipped for emergency backup when the air separation was stopped or export of liquid products. The value of oxygen content in nitrogen product is designed to be less than 3ppm (i.e., < 3 ×10-6) due to the high requirement of users for nitrogen purity. But in fact, the oxygen content of liquid nitrogen in the tanks had been found more than 5ppm. The substandard purity of liquid nitrogen not only affects the export of products, but also directly affects the emergency backup of liquid nitrogen backup system.

Problems with the liquid level gauge can occur in three ways: high, low or unstable indications.First of all, check whether the liquid level meter is leaking, pass an air source into the positive pressure chamber and block the negative pressure chamber to see if there is any air leakage. The high indication is generally due to a leak in the negative pressure chamber, which increases the differential pressure; the low indication is due to a leak in the positive pressure chamber, which decreases t...