Overpressure preventing device for pump box of air separation plant

Abstract

The invention provides an overpressure preventing device for a pump box of an air separation plant. The overpressure preventing device for the pump box of the air separation plant mainly comprises a cylinder, a flange, a blank flange, a seal ring, bolts, a connection piece, a waterproof cylinder and a waterproof cover plate. One end of the cylinder is connected with the flange in a welded manner.The flange is connected with the blank flange through the bolts. The large end of the bolt is in spot welding with the flange. The blank flange can move in the vertical direction along the bolt. The nitrile butadiene rubber seal ring is arranged between the flange and the blank flange in a padding manner and guarantees that the pump box is sealed in the normal state. The waterproof cover plate isadditionally arranged outside the blank flange. The waterproof cover plate is welded to the waterproof cylinder. The waterproof cover plate, the waterproof cylinder and the connection piece constitutea waterproof assembly. The waterproof assembly is connected with the flange in a welded manner through the connection piece, and therefore it can be guaranteed that rainwater cannot enter the pump box. The overpressure preventing device for the pump box of the air separation plant has the advantages of being simple in structure, safe, reliable, reasonable, efficient, high in practicability and the like, the overpressure preventing device is suitable for small-sized isolating boxes achieving heat preservation with pearlite, such as the pump box, a valve box and a collection box, and the situation that seal gas in the isolating boxes is at overpressure, so that safety accidents are caused can be effectively prevented.

Description

technical field [0001] The invention relates to an anti-overpressure device for a pump box of an air separation plant, and belongs to the technical field of safety facilities of the air separation plant. Background technique [0002] At present, it is necessary to consider installing a certain number of anti-overpressure devices on the main cold box of the air separation unit and the cold box of the plate heat exchanger to ensure that the pressure in the cold box can be quickly reduced in the event of an accident or overpressure of the sealing gas. , to prevent further cold box damage. This kind of device usually has a complex structure and takes up a lot of space. [0003] With the diversification of the downstream demand of the air separation unit, the types of equipment and machines have increased greatly. Many low-temperature pipelines and equipment need to use pearlite insulation boxes, such as pump boxes, low-temperature jacket insulation pipes, etc. Due to the speci...

AI Technical Summary

Problems solved by technology

The overpressure relief device among them plays the role of the safety valve of the insulation box, which is an important part to prevent the accident of the insulation box due to overpressure; A small cold box will cause the design of the pump box to be too large, waste materials, and fail to achieve satisfactory results. Therefore, it is necessary to design a special anti-overpressure device for the independent pump box, expansion box, and pearlite sand insulation jacketed pipeline to meet Its safety requirements make the structure compact and reduce the cost

Images