Liquid nitrogen tank manufacturer, liquid nitrogen tank price inspection content, Zhongjie contracting, after-sales service

Description :

　　Inspection content of liquid nitrogen storage tank:

　　1. Original data review: Review the factory technical documents of the product, including material certificates and retest reports for the inner and outer cylinders, stainless steel welding process evaluation report, weld inspection report (including inspection report for welding repair parts), hydrostatic test report, air pressure (tightness) test report, helium leakage test report, evaporation rate test report, and vacuum degree test report, etc. ⑵ Review the operation records of the storage tank and inquire with the equipment management and operators. Is there any significant change in pressure during operation. Whether the safety valve has tripped, whether the evaporation rate has increased, etc.

　　2. External inspection: In addition to conducting external inspections according to the requirements of general pressure vessels, the following main contents should be checked: whether various valves are open and closed normally; Whether safety accessories such as pressure gauges and liquid level gauges have been inspected according to regulations, and whether their use is within the calibration period; Are there any leaks at the connections between containers, pipelines, and pipe valves; Is there any sweating or frosting on the outer surface of the storage tank, especially on the top and bottom surfaces of the outer cylinder; Damage to the supporting legs, sinking, tilting, and cracking of the foundation, and the integrity of the fastening bolts.

　　3. Wall thickness test: Select 4-8 points on the outside of the outer cylinder for wall thickness testing to determine the small wall thickness H. At the same time, measure the diameter D2 of the outer cylinder from the outside, and based on the recorded inner diameter D1 from the original data review, follow the formula (D2-H-D1)/2<; 300mm。

　　4. Inspection of the inner surface of the endoscope barrel: Check for corrosion on the inner surface of the barrel. Focus on inspecting suspicious areas.

　　5. Surface inspection (MT or PT): Conduct surface inspection on the outer surface of all fillet welds of the outer cylinder connecting pipe, and perform penetrant inspection (PT) on the parts that cannot be subjected to magnetic particle inspection (MT).

　　6. Vacuum degree test: When the tested vacuum degree reaches 16Pa in a cold state, or when the safety valve frequently trips or the inner cylinder experiences abnormal pressure rise, it is necessary to re evacuate. Low temperature storage tanks are vacuum powder insulated and consist of a double-layer container consisting of an inner container and an outer container. They can be divided into two types: vertical and horizontal. According to the packaging medium, the selected material is austenitic stainless steel, namely 0Gr18Ni9 or SUS304; The outer container material is selected as Q235-B or 16MnR according to different user regions, and the interlayer of the inner and outer containers is filled with insulation material pearl sand and vacuumed. The insulation performance of liquid nitrogen storage tanks produced by manufacturers is as follows: the insulation material is filled with hot pearl sand in the interlayer and vacuumed. After the interlayer is sealed, the vacuum degree standard is: effective volume: less than or equal to 10m3, the vacuum degree is ≤ 2Pa; greater than 10m3 and less than or equal to 50m3, the vacuum degree is ≤ 3Pa; greater than 50m3 and less than or equal to 100m3, the vacuum degree is ≤ 5Pa. The factory vacuum degree is 0.8Pa for less than 10m3, 1.2Pa for greater than 10m3-50m3, and 3Pa for greater than 50m3-100m3. The interlayer vacuum degree is measured,.

　　Design parameters: Design pressure: 0.84Mpa, 1.32Mpa, 1.68Mpa Working pressure: 0.8Mpa, 1.2Mpa, 1.6MPa Design temperature: -196 ℃ Working temperature: -196 ℃. Widely used in gas industry, hospitals, metal smelting and other gas consuming users, it is a good product for achieving centralized gas supply. It has the characteristics of long service life, compact structure, small footprint, centralized control, and easy operation. Manufacturers of liquid nitrogen storage tanks, including low-temperature storage tanks, liquid oxygen storage tanks, LNG storage tanks, liquid nitrogen storage tanks, carbon dioxide storage tanks, low-temperature tanks, liquid oxygen tanks, LNG tanks, pressure vessels, and LNG refueling station equipment. Product features: Reasonable design, high safety performance, easy operation and maintenance. The design process fully considers equipment safety, while also reducing manufacturing costs and saving users money. Scope of application: Suitable for industrial gas stations, LNG refueling stations, LNG gasification stations, gas boiler centralized gas supply, enterprise gas centralized gas supply equipment, and can be customized and manufactured according to customer needs.

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• Liquid nitrogen storage tank manufacturer