4.1 Design Unit Selection: The selection of a design unit for the liquefied petroleum gas storage tank system engineering shall be responsible by the project organization department of each provincial (city, district) company. The selection should be made from the list of eligible design institutes in the panel, and the supervisor's signature for 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 Inspection: 4.2.1 Site inspections should be conducted by the project organization department of each provincial (city, district) company, involving personnel from the construction, pipeline installation, quality safety departments, and design institutes of the branch company where the gas station is located. 4.2.2 Research and investigate the layout and burial depth of the existing underground pipelines and cable installations within the gas station. For stations that cannot provide on-site pipeline data, pipeline detection technology should be used to determine the existing process, electrical, and drainage pipelines. 4.2.3 The construction department of the branch company where the gas station is located shall propose suggestions for the scope and method of renovation (including oil vapor recovery systems, refueling vapor recovery systems [dispersed, centralized], and vapor emission treatment facilities], and related equipment facility renovations. After obtaining approval from the supervisor and the project organization department of the provincial (city, district) company, the design unit shall base the design 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 (city, district) company, which shall organize the pipeline installation, quality safety departments, construction personnel of the branch company where the gas station is located, and the design institute for review. The supervisor's approval is required for the proposal. 4.4 Construction Drawing Design: 4.4.1 The selection of equipment shall be provided by the project organization department of each provincial (city, district) company with a list of pre-qualified suppliers for oil vapor recovery equipment. The design institute shall select the relevant equipment based on this list. The selection should adhere to principles of safety, reliability, technical advancement, cost-effectiveness, meeting emission standards, and using simple, convenient products with minimal on-site modification. Attention should be paid to the following: 4.4.1.2 It is preferable to select equipment from the same manufacturer in the same region for easier after-sales service. 4.4.1.2 Gas stations with an annual gasoline volume of more than 3,000 tons and more than 10 gasoline guns should use centralized refueling vapor recovery systems; others should use dispersed systems. 4.4.1.3 Different types of refueling vapor recovery technologies and equipment should be selected based on the internal space of the fueling pumps. For example, a secondary recovery dispersed vacuum pump should use a smaller power rating, utilizing the existing power supply of the fueling pump, and it is not advisable to lay additional power cables. For reducing the amount of tank modification, a centralized vacuum pump should be used with electric drive, not a submersible pump. 4.4.1.4 The vapor emission treatment facility should be selected based on the surrounding environment, site size, and business volume of the gas station. The maximum vapor treatment capacity should be 10% to 20% of the maximum fueling volume. 4.4.2 Construction Drawing Design: 4.4.2.1 The design institute shall prepare the construction drawings based on the approved design proposal. 4.4.2.2 The liquefied petroleum gas storage tank pipelines should be made of seamless steel tubes that comply with the current national standard "Seamless Steel Tubes for Transporting Fluids" GB/T8163. The design pressure for oil product pipelines should not be less than 0.6 MPa, and the design pressure for oil vapor recovery pipelines should not be less than 0.13 MPa. It is not advisable to use thermoplastic plastic pipelines or other flexible material pipelines.

1、Liquefied Petroleum Gas TankSafety Operation: The "mm_+0" refers to the safe operation. To prevent the liquefied gas storage tank from experiencing over-temperature and over-pressure phenomena, the pressure and temperature of use should be controlled. The causes of over-temperature and over-pressure in the liquefied gas storage tank include the following:

(1) Operation Error: To prevent operational mistakes, labels should be affixed to key operation devices. These labels should clearly indicate the opening and closing directions of valves, their states, and precautions with visible markings or text.

(2) Overfilling of Liquefied Gases - Measures to prevent overfilling include: strictly filling according to the specified storage capacity; upon discovering overfilling, immediately attempt to remove the excess; all gauges used for filling must be regularly inspected, and level gauges should be periodically flushed; any residual liquid in the container should be included in the filling quantity; its weight cannot be ignored; and when the surrounding temperature rises, spray cooling should be applied.

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