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liquid oxygen

Priestley Gas Industries in the field of production and distribution of two strategic products of oxygen and nitrogen in the form of liquid oxygen and liquid nitrogen based on the old experience of producing these products with purity of at least 7.99% for liquid oxygen and grade 5 and grade 5.5 for nitrogen Liquid, has the ability to produce in bulk, to meet the order of liquid oxygen and liquid nitrogen from loyal customers of the organization

Liquid oxygen storage strategy

In recent years, the use of liquid oxygen in health centers has increased significantly. This information bulletin outlines the basic requirements of the National Fire Protection Association (NFPA 99) for the safe storage, transport and use of liquid oxygen.

Liquid oxygen boils at 299.3 degrees Fahrenheit and is very cold. If they come in contact with unprotected clothing, they can cause severe frostbite or cold burns. The skin adheres to cold surfaces at freezing temperatures, causing additional damage.

A volume of liquid oxygen at atmospheric pressure expands significantly when heated, producing approximately 860 volumes of gaseous oxygen at ambient temperature when evaporated. The large volume of gaseous oxygen resulting from the evaporation of liquid oxygen has the potential to cause very high gas pressures if trapped in a closed circuit that is not sufficiently protected by pressure relief devices, causing the containers, transmission lines to rupture. , Pipes, etc.

Liquid oxygen transfer should only be performed by fully qualified and experienced individuals who are familiar with the precautions required to avoid its hazards. It is equally important that the oxygen dealer provides written operating instructions for the safe transfer of liquid oxygen and that these instructions are followed carefully.

It is strongly recommended that facilities that monitor the use of liquid oxygen be aware of all applicable NFPA 99 requirements. In addition, the facility must identify a room or rooms that meet the above requirements for liquid oxygen transport.

Oxygen storage methods include high-pressure oxygen capsules, supercooling, and chemical compounds. For economic reasons, oxygen is often transported mainly in liquid form in special insulated tanks, because one liter of liquid oxygen is equivalent to 840 liters of gaseous oxygen at atmospheric pressure and 20 degrees Celsius (68 degrees Fahrenheit). [5] Reusable mass oxygen tanks are used outside of hospitals and other facilities that require large volumes of pure oxygen gas. Liquid oxygen is transported through heat exchangers, which convert supercooled liquid to gas before entering the building.Oxygen is also stored and transported in smaller cylinders containing compressed gas. A form that is useful in portable medical applications and oxygen cutting.

Non-flammable gases are stored in two ways:

Values ​​of less than 3000 cubic feet and values ​​of more than 3000 cubic feet. (Three (3) containers of 41 liters of liquid oxygen in storage is more than 3000 cubic feet)

Here are some important tips for storing liquid oxygen:

Liquid oxygen storage of less than 3,000 cubic feet:

Non-flammable gases stored in quantities of less than 3000 cubic feet must be stored in internal storage and in a locked container separate from combustible or incompatible materials. Combustion sources are prohibited at the storage site and oxygen cannot be stored with any flammable gas, liquid or vapor.

Liquid oxygen storage of more than 3,000 cubic feet:

Non-flammable gas storage conditions in excess of 3,000 cubic feet In addition to the requirements listed above, storage facilities must have a fire-resistant structure. Such places must also be equipped with a mechanical ventilation system. (Natural ventilation is allowed when the storage area has at least one external wall).

Hospital Liquid Oxygen Reservoirs (LOX) are pressure vessels and vacuum insulators that consist of an internal and external pressure tank. The inner container is designed to store liquid oxygen at low temperatures. The space between the inner and outer layers is evacuated to a pressure below 50 microns.

The use of gaseous or liquid oxygen requires design and compatibility requirements with other materials. To ensure this compatibility, metals, soft goods in valve components and lubricants must be carefully selected. The cleanliness of oxygen systems is very important. Definitely due to pollution and particles can ignite. During operation, the valves should be opened and closed slowly and the oxygen flow rate should be kept at a flow rate of less than 100 feet per second to avoid the risk of adiabatic compression. Oxygen systems should be inspected for leakage, proper ventilation, proper system components design and system cleanliness. Systems must be carefully designed to withstand adequate failure and personnel safety.

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