Attachment: Safety valves and pressure gauges are mandatory for rigorous inspection. It is essential to report for inspection at the local quality supervision bureau to ensure better user experience. If the pressure gauge fails, you won't know the exact pressure your terminal consumes, and you cannot use it with peace of mind, fearing issues with the liquefied gas storage tank. Both the air compressor and the storage tank itself have safety valves. When pressure exceeds the safe setting of the safety valve, it will automatically release pressure, and the pressure gauge plays a significant role. Therefore, daily accessories of special equipment must be used with caution. In case of any issues, first confirm if the steel plate thickness of the storage tank meets the standards, and if not, determine the cause of the steel plate corrosion. Also, reconfirm if the safety valves, pressure gauges, and other auxiliary equipment meet the requirements. If all are found to be不合格, the local technical supervision bureau of the enterprise will issue an inspection不合格 notice, and the enterprise is to replace the new pressure vessel upon receiving the notice.
4.1 Design Unit Selection: The selection of a design unit for the liquefied petroleum gas storage tank system engineering shall be handled by the project organization department of the provincial (city, district) companies. The selection should be made from the list of design institutes prequalified in the panel, and the responsible supervisor must sign and approve it. The design unit should be qualified for petrochemical engineering design and industrial pipeline (GC2) design. 4.2 Site Survey: 4.2.1 The site survey should be conducted by the project organization department of the provincial (city, district) companies, involving the construction, pipeline, quality safety departments, and design institute of the branch office located at the gas station site. 4.2.2 During the research and survey of the gas station, the layout and burial depth of the existing underground pipelines and cable installations should be understood. For stations that cannot provide site pipeline data, pipeline detection technology should be used to determine the existing process, electrical, and water supply and drainage pipelines. 4.2.3 The construction department of the branch office at the gas station site shall propose suggestions for the scope of renovation, renovation methods [unloading vapor recovery system, refueling vapor recovery system (dispersed, centralized), and oil and gas emission treatment facilities], and related equipment facilities renovation, based on the principles of economy and practicality and relevant local government requirements. After approval by the responsible supervisor and the project organization department of the provincial (city, district) company, the design unit shall proceed with the design based on these suggestions. 4.3 Design Proposal: 4.3.1 The design proposal submitted by the design institute should include technical documents such as general layout, oil vapor recovery process diagrams, and lists of main equipment and materials. 4.3.2 The design proposal should be submitted to the project organization department of the provincial (city, district) company, which will organize the pipeline, quality safety departments, construction personnel from the branch office at the gas station site, and the design institute for proposal review. The proposal should then be submitted for approval by the responsible supervisor. 4.4 Construction Drawing Design: 4.4.1 Equipment selection: The project organization department of the provincial (city, district) companies will provide a list of prequalified suppliers for vapor recovery equipment. The design institute shall select the relevant equipment based on this list. Equipment selection should adhere to principles of safety, reliability, technical advancement, economic practicality, and compliance with emission standards, and should use products that are easy to install, convenient, and require minimal on-site modifications. The following points should also be considered: 4.4.1.2 It is preferable to select equipment from the same manufacturer in the same area for ease of after-sales service. 4.4.1.2 Gas stations with an annual gasoline sales volume of over 3,000 tons and over 10 gasoline nozzles should use a centralized refueling vapor recovery system. The rest should use a dispersed refueling vapor recovery system. 4.4.1.3 Different types of vapor recovery technology and equipment should be selected based on the internal space of the fuel dispenser. For example, a secondary recovery dispersed vacuum pump should be powered by a smaller motor that can utilize the existing power supply of the fuel dispenser, rather than laying additional power cables. 4.4.1.4 The oil and gas emission treatment facilities should be selected based on the surrounding environment, site size, and business volume of the gas station. The maximum treatment capacity of the oil and gas emission treatment facilities should be 10% to 20% of the maximum fuel volume. 4.4.2 Construction drawing design: 4.4.2.1 The design institute shall proceed with the construction drawing design based on the approved design proposal. 4.4.2.2 The liquefied petroleum gas storage tank pipeline should be made of seamless steel pipe that complies with the current national standard GB/T 8163 for fluid transmission. The design pressure for oil pipeline should not be less than 0.6 MPa, and the design pressure for the oil vapor recovery pipeline should not be less than 0.13 MPa. Flexible materials such as thermoplastic plastic pipelines should not be used.
