4.1 Selection of Design Unit for Liquefied Gas Storage Tank Engineering: The selection of a design unit for the liquefied gas storage tank system engineering should be handled by the project organization department of the provincial (city, district) companies. It should be chosen from the shortlisted design institutes, and the supervisor's approval must be obtained after signing. The design unit should be qualified with petrochemical engineering design资质 and industrial pipeline (GC2) design资质. 4.2 Site Survey: 4.2.1 The site survey should be conducted by the project organization department of the provincial (city, district) companies, organizing the construction, pipeline, quality safety departments of the branch company where the gas station is located, as well as the design institute personnel for the site survey. 4.2.2 For the research and survey of the gas station, the layout and burial depth of the existing underground pipelines and cable laying 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 company where the gas station is located should propose suggestions for the scope of renovation, renovation methods (unloading oil vapor recovery system, refueling oil vapor recovery system [dispersed, centralized], oil and gas emission treatment facilities), and related equipment facilities renovation, based on the principles of economy and practicality and relevant requirements of the local government. After approval by the supervisor and the project organization department of the provincial (city, district) company, the design unit will base the design on these suggestions. 4.3 Design Proposal: 4.3.1 The design proposal submitted by the design institute should include technical documents such as the general layout, oil vapor recovery process diagram, and main equipment and material list. 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, and construction personnel of the branch company where the gas station is located, as well as the design institute for proposal review, and the supervisor's approval will be obtained. 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 shortlisted suppliers for oil vapor recovery equipment, and the design institute will select the relevant equipment based on this list. Equipment selection should follow the principles of safety and reliability, advanced technology, economic practicality, and compliance with emission standards, and use products that are simple to install, convenient, and have minimal on-site modification. 4.4.1.2 It is advisable to choose 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 fueling volume of over 3,000 tons and more than 10 gasoline guns should use centralized refueling oil vapor recovery systems; others should use dispersed refueling oil vapor recovery systems. 4.4.1.3 Different types of oil vapor recovery technology and equipment should be selected based on the internal space of the fueling pumps. For example, a secondary recovery dispersed vacuum pump should be powered by a smaller motor that can utilize the existing power supply of the fueling pump, and it should not require additional power cable laying. 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 oil and gas treatment capacity of the emission treatment facilities should be 10% to 20% of the maximum fueling volume. 4.4.2 Construction drawing design: 4.4.2.1 The design institute will carry out construction drawing design based on the approved design proposal. 4.4.2.2 The liquefied gas storage tank pipeline should use seamless steel pipes that comply with the current national standard "Seamless Steel Pipes for Fluid Transmission" GB/T8163. The design pressure of the oil product pipeline should not be less than 0.6 MPa, and the design pressure of the oil vapor recovery pipeline should not be less than 0.13 MPa. Flexible materials such as thermoplastic plastic pipelines should not be used.

The diaphragm liquefied gas tank is primarily composed of an electric motor, base, crankcase, crank and connecting rod mechanism, cylinder components, oil and gas pipelines, electrical control system, and some accessories. It achieves increased gas pressure through single or multi-stage compression to meet the customer's requirements for pressure, flow rate, and temperature. The electric motor drives the crank, connecting rod, and piston to propel hydraulic oil, which in turn drives the diaphragm, compressing the medium through the diaphragm's vibration. The membrane press is a special type of volumetric liquefied gas tank, with its working cylinder divided into two parts by a diaphragm, the upper part being the gas chamber and the lower part the oil chamber. During operation, the piston moves upward to drive the hydraulic oil, which in turn drives the diaphragm to expel the compressed medium outside the membrane cavity. The diaphragm liquefied gas tank works by compressing the gas through the deformation of the diaphragm. As the diaphragm moves, it must tightly adhere to the cylinder cover membrane cavity surface with minimal gaps to the cylinder body membrane cavity surface. Through theoretical analysis and scientific selection of the membrane cavity curve radius, maximum deflection, and deflection index, a larger volume is ensured, allowing the diaphragm to work under nearly equal strength.

Liquefied gas storage tanks offer the following advantages and features:

1) The whole machine structure is designed reasonably, ensuring smooth and reliable operation with minimal vibration and low noise, and easy operation and maintenance. 2) The cylinder components use a structure without an oiling disk, reducing assembly difficulty and sealing surfaces; alarms are triggered upon compression medium leakage, enhancing the overall reliability of the machine. 3) The new diaphragm cavity curve improves the volumetric efficiency of the liquefied gas storage tank and extends the lifespan of the vulnerable diaphragm and gas valve. 4) The built-in oil pump station provides pressure-stable, clean, and well-cooled lubricating oil for the liquefied gas storage tank and cylinder operation, addressing the issue of oil leakage in the original external storage tank. 5) A highly automated control system ensures the safe operation of the equipment. 6) The entire equipment is mounted on a skid base, facilitating transportation, installation, and management.

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