1. 80cmb Underground LPG Storage Tank Overview and Installation Requirements

Underground liquefied petroleum gas (LPG) storage tanks are primarily utilized when site space is constrained. By reducing the required safety distance between the storage tank and buildings by half, underground installation effectively optimizes land utilization while maintaining an aesthetically coordinated overall appearance post-installation.

During installation, strict attention must be paid to the corrosion protection of the tank body. Cathodic protection must be implemented if necessary, and the external surface must be coated with two coats of epoxy asphalt primer followed by two coats of epoxy asphalt topcoat. The backfill material must be fine yellow sand with a uniform particle size, and proper sewage drainage must be ensured. Users may select different tank capacities based on their specific operational requirements.

2. 80cmb Underground LPG Storage Tank Engineering Key Focuses

The engineering focus for underground LPG storage tanks derives primarily from the characteristics of the medium. LPG is a highly flammable and explosive substance. Once a leak occurs, it easily forms a combustible gas cloud with a distinct tendency to accumulate in low-lying areas. Furthermore, LPG is typically stored as a pressurized liquid, meaning tank pressure fluctuates with temperature changes. Operations such as loading/unloading, ambient temperature variations, and abnormal operating conditions can all induce pressure fluctuations.

Consequently, the storage tank system must be equipped with a comprehensive pressure control and safety relief pathway. Additionally, the overall station layout must strictly implement safety separation distances, ventilation conditions, electrostatic grounding, lightning protection, and fire/explosion hazard zoning.

Underground installation does not imply that risk identification can be compromised. On the contrary, because the tank body is obscured and leaks are difficult to detect immediately, engineering practices place greater emphasis on the integrity of the monitoring, inspection, and emergency response chain. This includes the centralized layout, accessibility, and inspection convenience of the valve manifold area, as well as necessary leak detection alarms and interlocking strategies.

3. 80cmb Underground LPG Storage Tank Design and Manufacturing Standards

This horizontal storage tank is specialized equipment designed for containing and storing liquefied petroleum gas with a saturated vapor pressure of less than 1.77 MPa at 50℃. The tank is designed in strict accordance with the requirements of TSG R0004-2009: Supervision Regulation on Safety Technology for Fixed Pressure Vessels and GB 150: Pressure Vessels.

The manufacturer must possess a Class A2 Manufacturing License issued by the Boiler and Pressure Vessel Safety Supervision Bureau of the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ). Throughout the stages of design, manufacturing, inspection, and ex-factory delivery, the manufacturer is subject to inspection by the local Boiler and Pressure Vessel Inspection Institute of the Technical Supervision Bureau at any time and must obtain the inspection report issued by them. This inspection report—along with the technical data provided by the factory, including product as-built drawings, product conformity certificates, quality certificates, nameplate rubbings, and design calculation sheets—will be delivered to the user together with the product.

4. 80cmb Underground LPG Storage Tank Special Requirements for Underground LPG Tanks

Strict Quality Certification: Rigorous quality verification must be performed on the product’s pressure-retaining components regarding material specifications, external dimensions, weld quality, operational reliability, installation quality, internal devices, and safety accessories.

Routine Material Testing: Conventional physical and chemical testing of the tank materials, including mechanical properties and chemical composition, must be conducted.
Non-Destructive Testing (NDT): Welded joints, welds, tank heads, and the geometric positions of all interconnecting pressure-retaining components must be strictly inspected via X-ray radiographic testing and magnetic particle testing.

Performance Testing: Testing and verification must be conducted on the product’s leak tightness, pressure resistance, and all other technical indicators that impact the safe operation of the product.
Weld Inspection Criteria:

Class A and B welds: 100% radiographic testing (RT), Class II acceptance.

Class C and D welds: 100% magnetic particle testing (MT), Class I acceptance.

5. 80cmb Underground LPG Storage Tank Technical Specification Data Sheet

Item	Technical Data
Filled Medium	Liquefied Petroleum Gas (Propane)
Volume / Capacity	80 cbm
Design Pressure	1.77 MPa
Shell Design Thickness	16mm
Head Design Thickness	16mm
Main Material	Q345R
Corrosion Allowance	1mm
Heat Treatment Method	Post-Weld Heat Treatment (PWHT) for stress relief
Tank Tare Weight	17,840 kg
Filling Weight / Mass	33,600 kg
Overall Dimensions (ID \WT \ L)	2800 \16 \ 13,512mm
Filling Ratio / Coefficient	0.95
Hydrostatic Test Pressure	2.22 MPa
Service Life	20 Years
Medium Density	420 kg/cbm (at 50℃)
Governing Standards	GB 150 Pressure Vessels; Supervision Regulation on Safety Technology for Pressure Vessels
Optional Safety Accessories	Safety relief valve, magnetic flap level gauge, pressure gauge, thermometer, shut-off valve, etc.

Note: According to your business requirements, you can customize underground LPG storage tanks in other sizes / capacities.