Deyang Dewars

Test center

Gas cylinder test


         In addition to the manufacture and sale of cryogenic cylinders, Jinan Deyang Co., Ltd. also provides gas cylinder inspection. The inspection of gas cylinders includes:  inspection of LNG vehicle tank,  inspection of cryogenic cylinders, and  inspection of seamless gas cylinders. In addition to this, there is also the d inspection of safety valves.

♦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 Cylinder 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 vehicle-mounted cylinders.





♦LNG vehicle tank inspection

Compressed natural gas cylinders for vehicles are divided into four categories: steel gas cylinders, metal tank circumferential wound gas cylinders, metal tank fully wound gas cylinders, and non-metal tank fully wound gas cylinders.At present, the most commonly used are two kinds: steel cylinders and metal liner circumferential wound cylinders.

Car belongs to high pressure roller pressure vessel with compressed natural gas cylinder, the medium gas inflammable, explosive, frequent filling, storage, transportation, use, and often flow in the densely populated downtown, once the explosion occurred, will lead to catastrophic accidents, to people's life and property bring serious loss, poses a great impact on social stability.

      In order to ensure the safe use of automobile gas cylinders, the relevant departments of the state have promulgated quite a few standards, procedures and technical specifications to strengthen and standardize the supervision and management of automobile gas cylinders from the aspects of design, manufacture, installation, use, filling, transportation and regular inspection.
     Regular inspection of compressed natural gas cylinders for vehicle use is an important means to ensure the safe use of the cylinders, safety of people's lives and property and social stability.




Safety valve inspection


        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.