Oxygen (including liquid oxygen) is one of the main products of small air separation units, but also a strong accelerant and strong oxidant. Grease, fibres and metals can become combustible in a high oxygen concentration. Once the valve housing for oxygen leaks out, oxygen leakage may lead to deflagration or explosion.
Valves for oxygen in small air separation units as well as cryogenic valves require non-destructive testing of the pressure-bearing parts of the valve body for technical requirements. For the valve cast steel parts common types of defects and structural characteristics of the valve body, the new valve cast steel parts radiographic inspection technology measures and negative assessment methods of defect detection effect was satisfactory.
Dear air separation small air separation unit is a kind of liquid air separation system, which uses air as raw material, with compression cycle depth freezing method of air into a liquid state, and then after distillation, from the liquid air to gradually separate the production of oxygen, nitrogen and argon and other inert gases.
