LNG Storage Tank

LNG stands for Liquefied Natural Gas. Its primary component is methane. LNG is colorless, odorless, non-toxic, and non-corrosive, with a volume about 1/600th that of its gaseous form. Its weight is approximately 45% of the same volume of water, and it has a calorific value of 52 MMBtu per ton (1 MMBtu = 2.52×10^8 calories).

Model:

CFL-5/0.8，CFL-10/0.8，CFL-15/0.8，CFL-20/0.8，CFL-30/0.8，CFL-50/0.8，CFL-60/0.8，CFL-100/0.8，CFL-150/0.8...

CFW-5/0.8，CFW-10/0.8，CFW-15/0.8，CFW-20/0.8，CFW-30/0.8，CFW-50/0.8，CFW-60/0.8，CFW-100/0.8，CFW-120/0.8，CFW-150/0.8…

Low-temperature storage tanks are designed and manufactured in strict accordance with national standards, widely used for the storage and use of cryogenic liquids such as liquid oxygen, liquid nitrogen, liquid argon, liquid carbon dioxide, liquid natural gas, and liquid ethylene. They come in various working pressures and specifications. Equipped with unique high-vacuum insulation technology, they offer excellent insulation properties, long-lasting vacuum maintenance, and extremely low operating costs. The modular pipeline system and high-configured components enhance the equipment's performance and durability while reducing maintenance costs, significantly boosting your competitive edge.

Introduction:

Low-temperature insulated storage tanks are vacuum powder insulation type, consisting of a double container structure with an inner container and an outer container, which are available in vertical and horizontal models. The inner container, selected based on the medium to be stored, is made of Austenitic stainless steel, specifically S30408. The outer container material varies depending on the user's location, typically Q345R. The space between the inner and outer containers is filled with insulation material, Pearlite sand, and then vacuumed.

Application:

Liquid Oxygen (LO2), Liquid Nitrogen (LN2), Liquid Argon (LAr), Liquefied Natural Gas (LNG), Liquid Carbon Dioxide (LCO2)

Insulation performance:

Insulation materials are filled with pearl sand in a heated state for the sandwich layer and then vacuumed. After the sandwich layer is sealed, the vacuum standard is:

Seal Vacuum Gauge

Design Parameters:

Design Pressure: 0.84 Mpa, 1.32 Mpa, 1.68 Mpa

Operating Pressure: 0.8 MPa, 1.2 MPa, 1.6 MPa

Design Temperature: -196℃

Operating Temperature: -196℃

Effective Volume: 2.5m3, 3.5m3, 5m3, 10m3, 15m3, 20m3, 30m3, 50m3, 60m3, 100m3

Definition:

LNG stands for Liquefied Natural Gas.

The main component is methane. LNG is colorless, odorless, non-toxic, and non-corrosive, with a volume approximately 1/600th of the same amount of gaseous natural gas. Its weight is about 45% of the same volume of water, and the calorific value is around 52MMBtu/ton (1MMBtu = 2.52×10^8 calories).

Formation:

The natural gas produced from the gas field is first purified and then liquefied at ultra-low temperatures (-162℃) under atmospheric pressure to form liquefied natural gas.

The critical temperature of LNG between gas and liquid states at atmospheric pressure is -162℃.

The standard commonly used in LNG manufacturing is API 620 of the American Petroleum Institute.

Meaning:

Liquefied Natural Gas (LNG) storage tanks are specialized products and special equipment designed for storing LNG.TwoCategory pressure vessels, 06Ni9DR material, completed with flaw detection, hydrostatic and pneumatic testing, on-site inspection by the Technical Supervision Bureau, issued with pressure vessel inspection certificate, and external rust removal and painting processes. Liquefied gas storage tanks undergo strict quality assessment for the material, dimensions, weld quality, operational quality, installation quality, internal equipment, and safety accessories of the pressurized components.

Routine physical and chemical tests for the material of the container, such as mechanical properties and chemical composition.

The welding joints, welds, tank heads, and mutual geometric positions of all pressure components are rigorously 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.

1. Natural Gas Storage Tank LNG Storage System: The LNG storage system consists of low-temperature storage tanks, auxiliary pipelines, and control instruments.

2. By capacity classification:

Small natural gas storage tanks, 5-50 cubic meters, commonly used in residential gas liquefaction stations, LNG vehicle refueling stations, etc.

Medium-sized natural gas storage tanks, 50-100 cubic meters, commonly used in satellite liquefaction units, industrial gas vaporization stations, etc.

3. Natural gas storage tanks, LNG pipelines typically use austenitic stainless steel pipes. Austenitic stainless steel pipes offer excellent low-temperature properties.

4. Vertical natural gas storage tanks (LNG tanks) with vacuum powder insulation technology for thermal insulation. The inner cylinder and pipelines are made of OCr18Ni austenitic stainless steel, while the outer cylinder is constructed with high-quality carbon steel Q345R pressure vessel steel plates. Our company offers a variety of sizes from 50 to 100 cubic meters of liquefied natural gas storage tanks.

5. Uses of Natural Gas Storage Tanks: Chemical fuel, residential fuel, automotive fuel, combined power generation, heat pumps, fuel cells, etc.

6. Natural Gas Storage Vessel Liquefaction Processes: Cascade Liquefaction Process, Mixed Refrigerant Liquefaction Process, Liquefaction Process with an Expander.

7. The natural gas liquefaction unit consists of a natural gas pretreatment process, liquefaction process, storage system, control system, and fire protection system, etc.

Heze Boiler Factory Co., Ltd. _ Shandong Heke Group

Regular inspections

1. The user unit must report for periodic inspection to the inspection agency at least 1 month prior to the expiration of the regular inspection validity. The first periodic inspection of storage tanks typically occurs within 3 years of their commissioning. Subsequent inspection intervals are determined by the inspection agency based on the safety status level.

2. The user unit and its auxiliary units should carry out technical handling post-shutdown and conduct safety inspections prior to testing, ensuring the on-site conditions meet the requirements for the inspection work and prepare accordingly.

3. During inspections, the unit's safety management personnel, operation, and maintenance staff should be present to assist with the inspection, promptly provide relevant documents, oversee safety, and establish reliable communication methods.

Safety Protection

The potential hazards in the operation of liquefied natural gas primarily stem from its physical properties:

Liquefied natural gas has an extremely low temperature at atmospheric pressure: -162°C.

The gas-liquid volume ratio is quite high; improper pressure reduction measures can lead to a rapid increase in pressure. The gas-liquid volume ratio of liquefied natural gas is approximately 620:1.

Natural gas is an asphyxiating gas.

Natural gas is a flammable gas (ignition point 538°C).

Explosions may occur in confined spaces (explosion limits in air: 5.3% to 15%)

2. When working at a site with natural gas or liquefied natural gas, the following safety knowledge is required:

Keep liquefied natural gas equipment away from flames or electrical sparks.

No smoking or open flames allowed in areas involved in liquefied natural gas equipment maintenance, refueling, and storage.

When working in areas with liquefied natural gas, safety goggles, face shields, and insulated gloves must be worn. Pants should not be tucked into boots, sleeves should not be worn inside insulated gloves, and boots should not have nails.

When dismantling and repairing parts, it is necessary to empty and depressurize the liquefied natural gas tank.

Tools used for maintenance should not produce sparks.

Warning

Protect eyes and exposed skin.

Maintain good ventilation in the area where the equipment is located.

Ensure system is depressurized before repairing or maintaining equipment.

Keep away from flammable materials or electrical sparks.

The root valve must be kept open constantly.