Low-temperature storage tanks are commonly used in the industrial gas sector, where the application range is extensive. Industries such as steel mills, chemical, petroleum, food, and aerospace all require gases. Industrial gases like oxygen, nitrogen, and argon, which are in high demand, are separated from air using air separation equipment. This involves compressing and liquefying air, then separating the oxygen, nitrogen, and argon based on their different boiling points, and finally storing them in low-temperature storage vessels.

The company boasts 2 shot blasting rooms, with all storage tanks employing pneumatic steel shot blasting for rust removal, ensuring both exterior quality and paint quality. (After overall shot blasting, the paint's adhesion is improved, significantly extending its lifespan.)

Each unit undergoes hydrostatic testing to ensure equipment strength safety; each unit is tested for air tightness to guarantee sealing performance. After hydrostatic testing, the internal air is blown clean; and plastic plates are used to seal each pipe opening to prevent secondary contamination from the outside.

Huzhou Boiler Factory Co., Ltd.'s Pressure Vessel Division specializes in producing 5-200 cubic meter liquefied gas storage tanks, liquid ammonia tanks, etc. Our LPG storage tank series is designed, manufactured, and inspected in accordance with the GB150-2011 standard, utilizing Q345R steel plates specifically for pressure vessels. The entire tank is rolled using CNC coiling equipment and焊接 with automatic gas shielded welding technology, ensuring strong and aesthetically pleasing welds. Post-weld heat treatment in an overall annealing furnace further eliminates internal stresses, enhancing the material's toughness and hardness, providing superior results compared to resistance wire heat treatment. The liquefied gas storage tanks undergo 100% X-ray inspection to ensure that the steel plates and welds meet technical requirements. High-pressure jet shot peening for rust removal is much more effective than manual or sandpaper polishing, followed by four coats of paint—two anti-rust and two topcoats—to ensure the tank remains paint-free for years of use. Each tank is inspected and certified by the Quality and Technical Supervision Bureau before shipment, making it universally applicable across the country.

7 Liquefied Natural Gas Storage Tanks

7.1 General Provisions

7.1.1 The selection of liquefied natural gas storage tanks shall comply with the following regulations:

Conduct a risk assessment for the tank type of liquefied natural gas storage to determine its impact on the surrounding environment, personnel, and property safety.

Select the tank type shown in Appendix B of this specification for liquefied natural gas storage tanks.

In areas with dense entry points or facilities, it is advisable to choose double-walled tanks, full-volume tanks, or film tanks.

4 Under the condition that the required safety spacing is met, a single-container option can be selected.

7.1.2 The design of the liquefied natural gas (LNG) storage tank shall comply with the following regulations:

During and after the OBE period, the tank system should continue to operate.

During and after the SSE, the storage capacity of the tanks should remain unchanged and should be capable of being isolated and maintained.

3. The liquefied natural gas (LNG) storage tanks should undergo seismic calculations under OBE and SSE conditions, ensuring safe shutdown of the LNG storage tanks under SSE conditions. The prestressed concrete outer shell of the full-volume tanks should be subjected to ultimate bearing capacity calculations under ALE conditions.

7.1.3 The pipe openings of the liquefied natural gas storage tank should be located at the top of the tank.

7.1.4 The response spectra for OBE, SSE, and ALE should be determined as per the following requirements:

The OBE should represent an earthquake motion with a 10% exceedance probability within 50 years (return period of 475 years) and a damping ratio of 5%, and its response spectrum should not be less than the corresponding value for seismic fortification earthquakes as specified by the current national standard for seismic design of buildings, GB 50011, for the region in question.

SSE should represent seismic ground motion with a 2% probability of exceeding in 50 years (return period of 2475 years) and a damping ratio of 5%, and its response spectrum should not be less than the value corresponding to the rare earthquakes specified in the current national standard for seismic design of buildings, GB 50011, for the region in question.

The acceleration value of the 3 ALE spectrum should be half of the SSE spectrum acceleration value.

4 When the response spectrum of vertical earthquake is lacking, the coefficient of influence of vertical earthquake should not be less than 65% of the maximum value of the corresponding horizontal earthquake influence coefficient.

7.1.5 The auxiliary structures of the liquefied natural gas storage tank should be designed in accordance with OBE.

7.1.6 During seismic action, the damping ratios for each component of the liquefied natural gas storage tank design should be selected according to the specifications of Table 7.1.6.

Table 7.1.6: Yarn Count by Design Component

7.1.7 The permanent loads and variable loads of the liquefied natural gas storage tank shall comply with the specifications in Table 7.1.7.

Table 7.1.7 Permanently Applied Loads and Variable Loads on Liquefied Natural Gas Storage Tanks

Note: 1 a), b) Refer to Appendix B of this specification. "√" indicates consideration, while "—" indicates non-consideration.

"√* indicates that it only applies to the ambient steel tank top for low-temperature steel outer tanks."

7.1.8 The seismic loads and accidental loads for liquefied natural gas storage tanks shall comply with the provisions of Table 7.1.8.

Table 7.1.8: Seismic and Accidental Loads on Liquefied Natural Gas Storage Tanks

    Note: Refer to Appendix B of this specification for a) and b). "√" indicates consideration, while “—” indicates non-consideration.

7.1.9 The liquefied natural gas receiving station site should undergo seismic and geological disaster assessment.