Babjehec supplies liquefied natural gas storage tank brands
山东LNG储罐厂家 30立方卧式LNG储罐 真空天然气储罐
LNG Storage Tank Specifications
Low-temperature resistance
The boiling point of liquefied natural gas (LNG) at atmospheric pressure is -162°C. Therefore, LNG storage tanks must have excellent low-temperature resistance and superior insulation properties.
(2) High safety requirements
Due to the storage of low-temperature liquids inside the tank, in the event of an accident, the chilled liquid would volatilize in large quantities, with the vaporization amount being approximately 625 times that of the refrigerated state, forming an explosive mixture in the atmosphere. Therefore, double-walled tank structures are required, employing containment concepts. In the event of leakage from the first tank, the second layer would completely seal the leaking liquid and the evaporating gas, ensuring storage safety.
(3) Special materials.
The inner container must be able to withstand low temperatures and is made of austenitic stainless steel, while the outer cylinder is constructed from Q345R ordinary low-carbon alloy steel plate.
(4) Insulation measures are strictly implemented.
Due to the maximum temperature difference between inside and outside the can reaching up to 200°C, the can must have excellent insulation properties to maintain an internal temperature of -160°C. High-performance insulation material should be filled between the inner and outer cans. The insulation material at the bottom of the can must also have sufficient pressure-bearing capacity. (5) Good seismic performance
General building seismic requirements are to crack under specified earthquake loads but not collapse. To ensure the safety of storage tanks under unexpected loads, they must possess excellent seismic performance. Ensure that the tank does not sustain damage under the given seismic intensity. (6) Strict construction requirements
The tank welds must undergo 100% magnetic particle inspection (MT) and 100% vacuum leak tightness test (VBT). Strict selection of insulation materials is required, and the prescribed procedures must be followed during construction.
2. Structure of LNG Storage Tank
The low-temperature storage tank is a double-layered structure, with the inner tank storing low-temperature liquids, withstanding the pressure and low temperatures of the medium. The material of the inner tank is a low-temperature-resistant alloy steel (0Crl8Ni9). The outer shell serves as a protective layer for the inner tank, maintaining a certain distance from the inner tank to form an insulating space. It bears the gravitational loads of the inner tank and the medium, as well as the vacuum negative pressure of the insulating layer. The outer shell does not come into contact with the low temperature and is made of container steel. The insulating layer is mostly filled with mica sand, and a high vacuum is drawn. The evaporation rate of the low-temperature storage tank is generally below 0.2%.
Main components include: outer can, inner can, inner shell support, insulation layer, upper and lower liquid inlet pipes, upper and lower liquid level pipes, vapor pipe, overflow pipe, outlet pipe, as well as safety accessories and instruments, etc.
山东LNG储罐厂家 30立方卧式LNG储罐 真空天然气储罐
Liquefied Natural Gas (LNG) storage tanks are specialized products for storing LNG, classified as special equipment and Category III pressure vessels. They are made of 06Ni9DR material, undergo ultrasonic testing, hydrostatic and pneumatic testing, on-site inspection by the Technical Supervision Bureau, and are issued with pressure vessel inspection certificates. The manufacturing process also includes external rust removal and painting. The LNG storage tanks undergo strict quality assessment for the material of the pressure components, appearance dimensions, weld quality, operational quality, installation quality, internal equipment, and safety accessories.
Routine physical and chemical tests of the drum material, such as mechanical properties and chemical composition.
The weld joints, weld seams, tank end caps, and the mutual geometric positions of all pressure elements are strictly inspected through X-ray non-destructive testing and magnetic particle inspection. Tests are conducted on the product's sealing, pressure resistance, and all technical indicators that could affect the safe operation of the product.
Liquefied Natural Gas (LNG) Storage Tanks Category: Products Common Structures: Vertical LNG Tanks, Horizontal LNG Tanks Atmospheric Storage Tanks Atmospheric LNG Tanks and Extra-Large Atmospheric LNG Storage Tanks
Table of Contents
1 Common Structure
2 Cautionary Notes
Common Structure Edit
Common structures for LNG tanks include: vertical LNG tanks, horizontal LNG tanks, vertical mother-child tanks, and atmospheric tanks.
Vertical LNG Storage Tank
Volume options include 50 cubic, 100 cubic, 150 cubic, and 200 cubic.
Horizontal LNG Storage Tank
Volume options include 60 cubic and 100 cubic.
Vertical mother and son tanks
A mother tank is an inner tank composed of multiple sub-tanks connected in parallel to meet large capacity storage needs. These sub-tanks are assembled side by side within a large outer tank. The number of sub-tanks ranges from 3 to 7, generally not exceeding 12. The volume of a single sub-tank should not be too large, typically 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 large and medium-sized atmospheric LNG storage tanks, as well as extra-large atmospheric LNG storage tanks.
Important Notes
1. Cylinders must be stored in well-ventilated areas, with a minimum distance of 1.5 meters from any source of fire or heat. Cylinders are strictly prohibited from being heated with fire, boiled, or exposed to direct sunlight. Regular inspections of cylinder valves and pipeline joints for air tightness are required to ensure no leakage. Leak testing can be done with soap water, but using open flames is strictly forbidden.
2. When lighting, ignite the primer first, then open the gas; do not reverse the order. There should be a person supervising during use; do not leave it unattended to prevent boiling water from overflowing and extinguishing the flame, which could cause a gas leak and potentially lead to an explosion. After using the gas cylinder, be sure to close the valve tightly to prevent gas leakage.
3. Do not exhaust the liquefied gas in the cylinder; leave 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 gas cylinder. After the liquefied petroleum gas is used up, the remaining residue in the cylinder is also a flammable substance; it must not be poured out arbitrarily to prevent fires caused by the leakage and evaporation of the residue.
4. LPG cylinders are pressurized containers that require proper maintenance and regular inspections. Prevent the cylinders from falling or being struck during handling and use. Do not use metal tools to敲击 open the valve, and protect them from direct sunlight and prolonged exposure to rain. Cylinders should 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, as LPG is heavier than air, it tends to flow downward in the air, accumulating in low-lying areas and posing a hidden danger of gas explosion. Therefore, in areas where gas leakage is prone, relying solely on window ventilation is insufficient; attention must also be given to proper ventilation at the lower level.
6. Upon discovering a liquefied gas leak indoors, immediately open windows and doors for ventilation, allowing the gas to disperse towards a direction without open flames. Strictly prohibit any fire nearby until the fault is resolved and the unique odor dissipates before reusing. Dispose of any leaked liquid on the ground by covering it with sand and soil before removing it to a safe location. In the event of a gas cylinder fire, immediately close the valve, move it to an open area outdoors, and extinguish the fire using dry powder extinguishers, carbon dioxide extinguishers, or by covering it with wet burlap.
7. Educate children not to tamper with gas cylinders carelessly, and users must be aware of the safety knowledge for handling gas cylinders.
