Important Usage Precautions for lng Liquefied Natural Gas Filling Station Tanks:
1. Tanks with dual root valves, and the valves near the tank, should remain open.
2. During unloading, it is recommended that the tank's maximum filling capacity not exceed 90% of its effective volume (manufacturers specify between 85%-95% of the geometric volume), and the remaining capacity should not be less than 10%.
3. High pressure in an LNG tank does not necessarily indicate a problem with the tank itself. Consider the entire system's heat loss and liquid retention time. Generally, when pressure exceeds 1.1 MPa, a discharge to relieve pressure is required. Long-term high-pressure conditions can affect the lifespan of the vacuum in the tank's jacket.
4. If the tank exhibits extensive and prolonged "sweating" or frosting, and the pressure is rapidly and continuously increasing, consider the vacuum failure. Immediate action is required, including manual pressure relief and transferring the LNG liquid inside the tank.
5. It is recommended to perform vacuum testing on the storage tank annually. For hot tanks, a vacuum level below 1 Pa is acceptable, and for cold tanks, a vacuum level below 0.5 Pa (0.00375 TOF) is considered qualified.
6. Tanks must not be transported with liquid, and the LNG liquid inside should be discharged when they are left unused for an extended period.
7. Storage tanks are pressure vessels. According to the "Safety Supervision Regulations for Pressure Vessel Technology" implemented by the People's Republic of China, installation, maintenance, and modification of pressure vessels require that the units with corresponding qualifications notify the local quality supervision department, and obtain a permit before proceeding with installation, maintenance, or modification.
LNG Storage Tanks
LNG Storage Tanks, Manufacturer of LNG Storage Tanks, Factory Producing LNG Storage Tanks
Liquefied Natural Gas (LNG) storage tanks are specialized products for storing LNG, classified as special equipment and type III pressure vessels. They are made of 06Ni9DR material, and undergo non-destructive testing, hydrostatic and pneumatic testing, as well as on-site inspection by the Technical Supervision Bureau, resulting in a pressure vessel inspection certificate. The manufacturing process includes external rust removal and painting. The LNG storage tanks undergo rigorous quality assessment for the material of pressure components, appearance dimensions, weld quality, operational quality, installation quality, internal equipment, and safety accessories.
Routine physical and chemical tests for the drum material, such as mechanical properties and chemical composition.
The welding joints, welds, tank ends, and the mutual geometric positions of all pressure components are strictly inspected through X-ray non-destructive testing and magnetic particle inspection. Testing of the product's sealability, pressure resistance, and any technical indicators that could affect the safe operation of the product.
Liquefied Natural Gas (LNG) Storage Tank Category Product Common Structure Vertical LNG Storage Tank, Horizontal LNG Storage Tank Atmospheric Storage Tank Atmospheric LNG Storage Tank, Extra-Large Atmospheric LNG Storage Tank
Table of Contents
Common Structures
2 Cautionary Notes
Common Structure Editing
Common structures of LNG tanks include: vertical LNG tanks, horizontal LNG tanks, vertical mother-child tanks, and atmospheric storage tanks.
Vertical LNG Storage Tank
Volume options include 50 cubic, 100 cubic, 150 cubic, and 200 cubic.
Horizontal LNG Storage Tank
Volume options: 60 cubic, 100 cubic.
Vertical mother and daughter tanks
The mother and child drums consist of multiple child drums connected in series to meet large storage capacity requirements. These child drums are assembled side by side within a large outer drum. The number of child drums ranges from 3 to 7, generally not exceeding 12. The individual child drum capacity should not be too large, usually between 100 to 150 cubic meters, with the maximum reaching 250 cubic meters. Common sizes include 1000 cubic meters, 1750 cubic meters, and 2000 cubic meters.
Atmospheric Storage Tank:
We offer medium to large-sized atmospheric LNG storage tanks, as well as extra-large atmospheric LNG storage tanks.
Cautionary Notes
1. Cylinders must be stored in well-ventilated areas, with a minimum distance of 1.5 meters from any fire or heat source. Cylinders are strictly prohibited from being heated with fire, boiled in water, or exposed to direct sunlight. Regular checks should be conducted on the gas tightness of cylinder valves and pipeline joints to ensure no leakage. Leaks can be detected using soap water, and it is strictly forbidden to test for leaks with an open flame.
2. When lighting, always ignite the primer first, followed by opening the gas; do not reverse the sequence. Someone must be present to supervise during use and not leave to prevent boiling water from overflowing and extinguishing the flame, which could cause the escaping gas to ignite and explode. After using the gas cylinder, ensure the valve is tightly closed to prevent gas leakage.
3. The liquefied gas inside the cylinder should not be completely depleted, leaving a certain residual pressure. The residual pressure should generally be greater than 49.03 kPa (i.e., 0.5 kg/cm², gauge pressure) to prevent air from entering the cylinder. After the liquefied petroleum gas is used up, the remaining residue inside the cylinder is also a flammable substance and should not be poured out arbitrarily to avoid fires caused by the leakage and evaporation of the residue.
4. LPG cylinders are pressurized containers that require proper maintenance and regular inspections. During handling and use, prevent the cylinder from falling or being struck. Do not use metal tools to敲击 open the valve, and protect it from direct sunlight and prolonged exposure to rain. Cylinders should generally be inspected every 2 years.
5. Although the explosive range of liquefied petroleum gas (LPG) is not very wide, its lower limit is small, making it easy to ignite and explode upon leakage. Additionally, since LPG is heavier than air, it tends to flow downwards upon leakage in the air, accumulating in low-lying areas and posing a hidden danger of gas explosions. Therefore, areas prone to gas leakage require more than just window ventilation; attention must be given to proper ventilation at the lower level.
6. When a liquefied gas leak is detected indoors, windows and doors should be opened immediately for ventilation, allowing the gas to disperse away from any open flame. No fire is allowed in the vicinity. The area should only be used after the fault is resolved and the distinctive odor has dissipated. Any leaked liquid on the ground should be covered with sand and soil before being removed to a safe location. In case of a gas cylinder fire, shut off the valve immediately, move it to an open area outdoors, and extinguish the fire using dry powder extinguishers, carbon dioxide extinguishers, or by covering it with a wet sack.
7. Educate children not to play with gas cylinders carelessly, and users must be aware of the safety knowledge regarding gas cylinder usage.
