Heze Boiler FactoryLimited Company

Equipment Name: Natural Gas Storage Tank---Liquefied Natural Gas Storage Tank---Natural Gas Storage Tank (Function Description)

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Manufacturer:Heze Boiler FactoryLimited Company

This article analyzes the hazardous characteristics of low-temperature liquids and, in conjunction with various gas supply modes for low-temperature storage tanks, briefly outlines their basic requirements and key safety usage points.

An LNG storage tank is a jacketed vacuum powder-insulated pressure vessel specifically designed for storing and supplying low-temperature liquefied gases (such as liquid nitrogen, liquid oxygen, liquid argon, liquid carbon dioxide, etc.). It is widely used in both industrial production and daily life.

1. Low-Temperature Liquid Hazard Characteristics Analysis

Low-temperature liquids possess hazardous characteristics, such as lower boiling points, higher expansiveness, stronger asphyxiating properties, and strong oxidizing properties.

1.1 Boiling points of low-temperature liquids at 101.3 KPa pressure: Liquid nitrogen at -196°C, liquid oxygen at -183°C, and liquid argon at -186°C. Contact with the human body can cause severe frostbite to the skin and eyes. In cases of minor leakage or internal leakage in valves, they absorb heat from the surrounding environment, causing rapid condensation and frost formation at the leakage point, which can lead to freezing in severe cases.

Low-temperature storage tank

1.2 Low-temperature liquids absorb energy from the surrounding environment due to high heat or large leaks, causing their volume to expand rapidly as they vaporize. At 0℃ and a pressure of 101.3 KPa, the volume of gas produced from 1L of low-temperature liquid upon vaporization is: nitrogen at 674L, oxygen at 800L, and argon at 780L. In sealed containers or pipelines, the increase in internal pressure due to the vaporization of low-temperature liquids can easily lead to overpressure explosions.

1.3 In the surrounding environment of low-temperature storage tanks, after the low-temperature liquid leaks and vaporizes, it's prone to form rich gas areas. If concentrations of nitrogen, argon, or carbon dioxide are high, asphyxiation injuries can easily occur. Additionally, high oxygen concentrations can also lead to hyperoxic injuries.

1.4 Oxygen is a powerful oxidizer with extremely strong oxidizing properties. Liquid oxygen, when in close proximity to combustible materials, is highly flammable upon contact with an open flame; contact with combustible materials can easily lead to detonation due to vibrations or impacts; mixing with combustible materials poses a potential explosion hazard. Liquid oxygen can adhere to clothing and fabrics, and upon contact with an ignition source, it can cause a flash fire, posing a risk to personal safety.

2. Low-Temperature Storage Tank Gas Supply Mode and Basic Requirements

The gas supply mode of low-temperature storage tanks mainly varies depending on the application and user requirements.

We offer: high-pressure gas cylinder refilling, low-temperature insulated gas cylinder filling, centralized gas supply through pipelines, and low-temperature liquid spray feeding, etc.

LNG Storage Tanks | Manufacturer of LNG Storage Tanks--Huzhou Boiler Factory Co., Ltd.

LNG storage tanks are specialized equipment designed for storing liquefied natural gas.Please provide the Chinese content you would like to be translated into American English.Category pressure vessels, on-site inspection by the Technical Supervision Bureau, issuance of pressure vessel inspection certificate, completion of 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 pressure components. Widely used in industries such as industrial gases and gas, including units with high gas consumption like machinery, chemicals, and metallurgy, serving as centralized gas supply facilities.Please provide the Chinese content that needs to be translated into American English.Superior equipment. Features include long service life, small footprint, ease of operation, and centralized control. The gas that leaks from LNG tanks is also very cold and can cause frostbite-like blisters when it comes into contact with skin. Natural gas is an asphyxiant. The oxygen content in the atmosphere is approximately 21%, and when the oxygen content in the air drops below 18%, it can cause asphyxiation in humans.

LNG Storage Tank Operation Procedure:

Wear antistatic suits, shoes, helmets, etc., and place devices prone to static electricity like cell phones and computers in a safe area.

Check if the tank's thermometer, level gauge, pressure gauge, flammable gas alarm, and safety valve are functioning properly.

All valves of the tanks to be pressurized, except for the root valve and the emergency shut-off valve, are in the closed position.

4. The bottom inlet valve of the tank, as well as the liquid and gas phase valves for pressure increase, are open. The valves before and after the pressure vaporizer are also open.

5. Open the low-temperature cutoff valve before the vaporizer, the ambient temperature flanged ball valve after the vaporizer, and all valves required to be opened in the pressure regulating system.

6. A single storage tank is sufficient to meet the gas supply requirements when the gas flow rate is less than 1000Nm3/h up to 2000Nm3/h.

7. When the tank pressure rises above 0.15 MPa higher than the outlet pressure, slowly open the liquid outlet valve and start to supply gas.

8. During operation, the LNG tank must maintain a liquid level upper limit of no more than 90% and a lower limit of at least 15%.

8. The on-duty staff must regularly patrol during gas supply, paying attention to the liquid level and pressure changes of the storage tank, ensuring at least 3 records are made daily.

9. Regularly inspect tanks, welds, valves, etc., and take immediate action if any leakage is detected to ensure that LNG meets production specifications.