Introduction of inspection
There are four types of compressed natural gas cylinders for vehicles: steel cylinders, metal liners, circumferentially wound cylinders, metal liners, full-wound cylinders, and non-metallic liners. At present, there are two types that are most commonly used: steel cylinders and metal liners are wound around the cylinder. Compressed natural gas cylinders for automobiles are high-pressure mobile pressure vessels. The natural gas contained in the medium is flammable, explosive, and frequently filled, stored, transported, and used. In addition, it often flows in densely populated urban areas. Once an explosion occurs, it will cause Catastrophic accidents cause serious losses to people's lives and property and have a huge impact on social stability.
In order to ensure the safe use of vehicle gas cylinders, the relevant state departments have issued a number of standards, regulations and technical specifications, from the design, manufacture, installation, use, filling, transportation and periodic inspection, etc., to strengthen and standardize the vehicle Supervision and management of gas cylinders.
Regular inspection of compressed natural gas cylinders for vehicles is an important means to ensure the safe use of the cylinders and to ensure people's lives and property safety and social stability.
♦Welding insulated gas cylinder inspection
It refers to the use of normal ambient temperature (-40 ° C ~ 60 ° C), the medium is liquid oxygen, liquid nitrogen, liquid argon, liquid carbon dioxide, liquefied natural gas, liquefied nitrous and other low temperature liquid, the design temperature is not Regular inspection and evaluation of mobile welded insulated cylinders with a capacity of less than -196 ° C, a nominal volume of not more than 450 L, and a nominal working pressure of 0.2 to 3.5 MPa.
Welded insulated gas cylinders are inspected every three years. If the welded insulated cylinders are damaged or suspected of safety and reliability during use, if the cylinders are damaged or suspected of safety and reliability, they should be inspected in advance. Or deactivate the welded thermal insulation cylinders for more than one inspection period. Tests should be carried out before commissioning. The periodic inspection items for welding insulated cylinders include: external inspection, piping, vacuum treatment, vacuum interlayer leak rate inspection and evaporation rate inspection.
In one of the following cases, the vacuum insulated gas cylinder must be vacuumed, the vacuum interlayer leak rate test and the static evaporation rate test: condensation and frosting of the welded insulation cylinder casing; welding of the insulated gas cylinder casing for inspection; When the hot gas bottle is damaged or has doubts about its safety and reliability; when the vacuum medium is equipped with a low temperature medium for welding the insulated gas cylinder, the interlayer vacuum is higher than 40 Pa; when the low temperature medium is filled, the interlayer vacuum is higher than 0.02 Pa.
♦Seamless gas cylinder inspection
In July 2010, our company was awarded the “Seamless Gas Bottle Inspection (PD1) (Cylinder Inspection Agency)” Special Equipment Inspection and Testing Agency Approval Certificate issued by Shandong Quality and Technical Supervision Bureau (TS7437072-2014). In November 2012, it was awarded the “Special Cylinder Inspection (PD5) (Cylinder Inspection Organization)” Special Equipment Inspection and Testing Agency Approval Certificate issued by Shandong Quality and Technical Supervision Bureau (TS7437097-2016). In addition to the production capacity of various types of welded insulated cylinders, our company also has professional inspection and inspection and maintenance teams and equipment, which can inspect and repair various types of welded insulated cylinders and car bottle.
♦Safety valve inspection introduction
The safety valve is an automatic valve that can use only the force of the medium itself to remove the fluid of the rated water without any external force, so as to prevent the pressure in the system from exceeding a predetermined safety value. A valve that closes itself and prevents the medium from continuing to flow when the pressure returns to normal. Safety valves are used in boilers, pressure vessels and other pressure equipment to prevent pressure in the equipment from exceeding the design allowable value. This protects the safety of equipment and operating personnel, so it is often used as the last protective device for pressurized equipment, so the verification of safety valves is very important. According to the national special equipment safety supervision department and the State Administration of Quality Supervision, Inspection and Quarantine, the safety valve must be regularly verified, and the period is one year.
Our company obtained safety valve inspection qualification in 2016, and has a complete calibration equipment, calibration system and professional team to inspect and repair various types of safety valves.
♦Safety valve inspection process
Maintenance service for welding insulated gas cylinders
In addition to the production capacity of welded and insulated gas cylinders of various specifications and models, our company also has a professional maintenance team and maintenance equipment, which can repair and maintain a series of problems in various specifications and types of welded thermal insulation cylinders, such as: vacuum damage, within Leakage, leakage; vacuum failure; safety accessories damage (including safety valves, rupture discs, pressure gauges, level gauges, valves, etc.); automatic boost; valves are not vented or liquid; no pressurization; The handrail roll collides and deforms; the outer bladder collides with the concave; the neck shrinkage and other problems.
All the cylinders that are repaired and maintained in our company are entitled to one year free warranty.