Product Description

Brand Hegu Group Model CFW-60/0.8

Material: Stainless Steel, Diameter: 2916mm

Application Range: -162℃; Volume: 60,000L

Wall Thickness: 8mm, External Dimensions: φ2916*14929mm

Origin: Shandong Heze

Heze LNG Storage Tank, Low Temperature Oxygen/Nitrogen/Argon Carbon Dioxide Storage Tank, 60 Cubic Meters LNG Storage Tank

Low-temperature LNG storage tanks are high-vacuum insulated stainless steel pressure vessels designed for the storage, transportation, and use of liquefied natural gas. The tanks are manufactured in accordance with GB18442 standards and are used for reliable and cost-effective transportation and storage of low-temperature liquids, as well as for on-site storage and supply of low-temperature liquid gases across a wide range of applications.

With the development of low-temperature liquid storage and transportation, the insulation technology for low-temperature containers is becoming increasingly refined. To maintain the storage and transportation of low-temperature liquids, as well as the temperature for low-temperature refrigeration, insulation measures must be taken for the low-temperature environment. Only under insulated conditions can low temperatures be maintained. Insulation can reduce vaporization loss or create conditions for the long-distance transportation of low-temperature liquids.

Low-temperature insulation methods can be divided into two major categories: general insulation and vacuum insulation.

(1) Standard insulation is an older, traditional method that involves applying solid, porous insulating materials to the exterior of equipment, containers, and pipes. These materials are filled with air or other gases under atmospheric pressure within their voids.

(2) There are three basic types of vacuum insulation: high vacuum insulation, vacuum powder insulation, and vacuum multilayer insulation.

Principles of Pressure Increase and Decrease in LNG Storage Tanks

Boost Pressure:

As LNG is used, the liquid level inside the tank continuously decreases, and the increased gas phase space causes the tank pressure to drop continuously. The flow rate of LNG gradually slows down until it stops. Therefore, during normal operation, it is necessary to continuously replenish gas into the tank to maintain the pressure within a certain range. This process is called pressurization. As shown in the diagram, the pressurization of the tank is achieved by an automatic pressurization system consisting of an autonomous pressurization regulator and a small air-temperature gasifier. When the tank pressure falls below the set value of the automatic pressurizer, the regulator opens, and the liquid inside the tank slowly flows into the pressurization gasifier due to the liquid level difference, and the gas produced by the vaporization of the liquid flows through the regulator and the gas phase pipe to replenish the tank. The continuous replenishment of gas raises the tank pressure, and when it exceeds the regulator's set value, the regulator closes. At this point, the pressure inside the pressurization gasifier will prevent further liquid inflow, and the pressurization process ends.

Relief Valves: (Overpressure Protection)

LNG can slowly evaporate during storage due to heat loss from the storage tank's environment, causing the tank's pressure to gradually increase and ultimately posing a risk to the tank's safety. Therefore, it is necessary to control the pressure limit by releasing the gas inside the tank. This is done by installing a regulator on the gas phase pipeline of the storage tank. When the pressure inside the tank rises to a set value, the pressure relief valve slowly opens to release the tank's gas. Once the pressure drops back below the set value, the automatic regulator closes automatically. It should be noted that the regulator referred to here is not the commonly used gas regulator. Most regulators rely on the action of the control valve at the outlet end, but this regulator operates based on the control valve at the inlet end, similar to the commonly used vent valve, and it must withstand low temperatures. The released gas is generally not released into the atmosphere; it is instead recovered and reused in subsequent processes. This portion of the gas is abbreviated as BOG.

Heze LNG Tank, Low-Temperature Oxygen/Nitrogen/Argon/Carbon Dioxide Storage Tank, 60 Cubic Meters LNG Tank

Product Description

Brand Huokou Group Model CFW-60/0.8

Material: Stainless Steel, Diameter: 2916mm

Application Range    -162℃    Volume    60000L

Heat Exchange Area  See drawing m²  Ambient Temperature  See drawing °C

Wall Thickness: 8mm, Outer Dimensions: φ2916*14929mm

Origin: Shandong Heze

60 cubic meters horizontal LNG storage tank / Natural gas low-temperature storage tank / Vacuum LNG storage tank - Competitive Price

The Functions of Different Parts of an LNG Tank

Outer Canister: Protects the inner canister and the insulating material between the inner and outer canisters, forming a vacuum between them to enhance the insulating properties of the material. The outer canister completely seals off any leakage of liquid and vapor, ensuring storage safety.

Inner罐: Primarily used for storing LNG, due to the ultra-low temperature characteristics of LNG, the material and manufacturing requirements for the tank are extremely stringent. Upper and lower liquid inlet pipes: Pay attention to the length of the upper liquid inlet pipe, which is approximately the same as the inner tank. The liquid inlet pipes in the storage tank use a combination nozzle and porous pipes to ensure that newly added LNG is thoroughly mixed with the existing LNG. LNG is transported to the refueling station from the LNG liquefaction plant via road tankers or tank container vehicles. During unloading, to prevent an increase in pressure within the LNG storage tank from affecting unloading speed, the upper liquid inlet method is used when the LNG temperature in the tanker is lower than that in the storage tank. The low-temperature LNG in the tanker is sprayed into the storage tank through the upper liquid inlet pipe nozzle in a spray-down state, cooling part of the gas to a liquid and reducing the tank pressure, allowing for smooth unloading. If the LNG temperature in the tanker is higher than that in the storage tank, the lower liquid inlet method is employed. The high-temperature LNG enters the storage tank through the lower liquid inlet, mixing with the lower-temperature LNG inside to cool down and prevent the high-temperature LNG from evaporating through the upper liquid inlet, which could increase the tank pressure and make unloading difficult. In actual operations, since the LNG gas source is usually farther from the cities consuming the gas, when transported over long distances to the consuming cities, the LNG temperature inside the tanker is typically higher than that in the storage tank at the gasification station, necessitating the use of the lower liquid inlet method. Therefore, except for the first time of filling LNG, the lower liquid inlet method is generally used during normal tanker unloading.

Safety Valve: When the pressure inside the storage tank exceeds the set pressure of the safety valve (also known as the working pressure), the safety valve will automatically open to release excess gas and stabilize the pressure. The set pressure of the safety valve is generally 1.04-1.1 times the operating pressure of the pressure vessel, and the reset pressure is 0.8 times the operating pressure of the vessel.

Safety Valve Terminology: The nominal pressure of a safety valve indicates the maximum allowable pressure under normal temperature conditions. For safety valves used in high-temperature equipment, the reduction in allowable stress of the material under high temperature should not be considered. Safety valves are designed and manufactured according to the nominal pressure standards.

Setpoint Pressure: Also known as the adjusting pressure, it is the pressure of the medium when the safety valve disc starts to lift under operating conditions. Discharge Pressure: The pressure on the inlet side when the valve disc reaches the specified opening height.

Seat Pressure: The inlet pressure when the valve disc re-seats onto the valve seat after the safety valve discharge, and the medium stops flowing out. Seat pressure is an important parameter indicating the quality of the safety valve usage, generally requiring it to be at least 80% of the working pressure, with the upper limit set to prevent frequent valve disc oscillation.

Difference in opening and closing pressure: The difference between the opening pressure and the return-to-seat pressure.

Outer Shell Burst Disc: Designed to prevent leakage at the connection root between the inner tank and the pipeline, which could cause the outer shell to explode due to increased pressure between the layers. The burst disc is installed to relieve pressure in time, thereby protecting the storage tank.

Differential Pressure Level Gauges: The differential pressure level gauge is commonly used in LNG storage tanks.

Hekou 60 Cubic Horizontal LNG Storage Tank, Natural Gas Low-Temperature Storage Tank, Vacuum LNG Storage Tank - Competitive Pricing