4.1 Design Unit Selection: The selection of a design unit for the liquefied gas storage tank system engineering shall be handled by the project organization department of the provincial (municipal, district) companies. The selection should be made from the list of design institutes shortlisted in the sector, and the designated supervisor's signature of approval is required. 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 (municipal, district) companies, organizing the construction, pipeline, quality safety departments of the branch company located at the gas station, as well as the design institute personnel for the site survey. 4.2.2 For the research and survey of the gas station, it should be understood the existing internal underground pipeline layout and cable laying depth. 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 at the gas station location, based on the principles of economy and practicality and relevant local government requirements, should propose suggestions for the scope of renovation, renovation methods [unloading vapor recovery system, refueling vapor recovery system (dispersed, centralized), oil and gas emission treatment facilities], and related equipment facilities renovation. After approval by the designated supervisor and the project organization department of the provincial (municipal, district) company, the design unit shall proceed with the design based on these proposals. 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 (municipal, district) company, which will organize the pipeline, quality safety departments, construction personnel of the branch company at the gas station location, and the design institute for proposal review, and then submitted for the designated supervisor's approval. 4.4 Construction Drawing Design: 4.4.1 Equipment selection: The project organization department of the provincial (municipal, district) companies will provide a list of pre-qualified suppliers for 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 easy to install, convenient, and have minimal on-site modification. Note the following: 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 more than 10 gasoline guns should use a centralized refueling vapor recovery system; otherwise, a dispersed system should be used. 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 use a smaller power rating, which can be driven by the existing power supply of the fuel dispenser, and it is not advisable to lay 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 will carry out construction drawing design based on the approved design proposal. 4.4.2.2 For the liquefied gas storage tank pipeline, seamless steel pipes that comply with the current national standard "Seamless Steel Tubes for Fluid Transportation" GB/T 8163 should be used. The design pressure of the oil pipeline should not be less than 0.6 MPa, and the design pressure of the vapor recovery pipeline should not be less than 0.13 MPa. It is not advisable to use thermoplastic plastic pipelines or other flexible material pipelines.
The diaphragm liquefied gas storage tank is primarily composed of an electric motor, base, crankcase, crank and connecting rod motion mechanism, cylinder components, oil and gas pipeline, electrical control system, and some accessories. It achieves increased gas pressure through single or multi-stage compression, meeting the customer's requirements for process parameters such as 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 diaphragm press is a special volume liquefied gas storage tank, with its working cylinder divided into two parts by a diaphragm. The upper part of the diaphragm is called the gas cavity, and the lower part is called the oil cavity. During operation, the piston moves upward to drive the hydraulic oil, which then drives the diaphragm to expel the compressed medium outside the diaphragm cavity. The diaphragm liquefied gas storage tank works by compressing the gas through diaphragm deformation. As the diaphragm moves, it must tightly fit the cylinder cover diaphragm cavity surface and have a smaller gap with the cylinder body diaphragm cavity surface. Through theoretical analysis and scientific selection of the diaphragm cavity curve radius, maximum deflection, and deflection index, a larger volume is ensured, allowing the diaphragm to work under approximately equal strength conditions.
Liquefied gas storage tanks primarily 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 is easy to operate and maintain. 2) The cylinder components use a structure without oiling disk, reducing assembly difficulty and the number of sealing surfaces; alarms are triggered when the compressed medium leaks, 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 components. 4) The built-in oil pump station provides a stable pressure, clean quality, and fully cooled lubricant for the liquefied gas storage tank and cylinder operation, also addressing the issue of oil leakage in the original external storage tank. 5) The 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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