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natural hydrogen gasLords Chloro Alkali Limited
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Lords Chloro Alkalies Limited
Lords Chloro Alkalies Limited
Lords Chloro Alkalies Limited
Lords Chloro Alkalies Limited
Lords Chloro Alkalies Limited

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Lords Chloro Alkali Limited
Lords Chloro Alkali Limited
Home » Hydrogen Gas

Hydrogen Gas

natural hydrogen gas

Hydrogen is produced by the steam reforming of natural gas, the electrolysis of water, the dissociation of ammonia, and as a by-product of petroleum distillation and chlorine manufacture, with the primary method for on-purpose generation being the steam reforming of natural gas. Other feedstocks can include ethane, propane, butane, and light and heavy naphtha but are not commonly used. The steam reforming process produces syngas, which is a mixture of hydrogen and carbon monoxide. Regardless of the method of production, the product steam is then separated into its components and the hydrogen dried, purified, and compressed into cylinders or tubes for transportation.

Although any fuel we use is inflammable & dangerous but hydrogen is non toxic, light so it scatters immediately upward when there is a leak, rather than pooling about polluting ground water soaking in to clothes. So if handled with care, it is safer than fuels in standard use.

Negative aspects
Storage : Since Hydrogen is light, it is difficult to store a lot of it in a small tank.
Distribution : There is not a wide spread distribution channel like other channels for other fuels. New infra structure is needed to put in place.
Cost :Hydrogen is much more expensive than gasoline since other resources are reaching there peak, the gases will come at par.
Danger : It is flammable & even explosives under certain conditions.

Gaseous Hydrogen
Hydrogen is a colorless, odorless, tasteless, highly flammable gas. It is also the lightest-weight gas. Since hydrogen is noncorrosive, special materials of construction are not usually required. However, embrittlement occurs in some metals at elevated temperatures and pressures. Stationary vessels and piping should be designed to the American Society of Mechanical Engineers (ASME) code and the American National Standards Institute (ANSI) Pressure Piping code for the pressures and temperature involved. Vessels used for transportation must be designed to meet the Department of Transportation (DOT) code.

Gaseous hydrogen may be supplied in tube trailers and cylinders. Hydrogen is usually compressed into gas cylinders by oil-lubricated compressors. The amount of gas in a cylinder is determined by the pressure, temperature, cylinder size, and cylinder pressure rating.

The molecular symbol for hydrogen is H2.

Hydrogen gas is odorless and nontoxic but may induce suffocation by diluting the concentration of oxygen in air below levels necessary to support life.

Caution :
The amount of hydrogen gas necessary to produce oxygen-deficient atmospheres is well within the flammable range, making fire and explosion the primary hazards associated with hydrogen and air atmospheres.

The wide flammability range, 4% to 74% in air, and the small amount of energy required for ignition necessitate special handling to prevent the inadvertent mixing of hydrogen with air. Care should be taken to eliminate sources of ignition such as sparks from electrical equipment, static electricity sparks, open flames, or any extremely hot objects

Hydrogen and air mixtures, within the flammable range, can explode and may burn with a pale blue, almost invisible flame.

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Molecular Weight 2.016
Boiling Point @ 1 atm -423.2°F (-252.9°C)
Freezing Point @ 1 atm -434.8°F (-259.3°C)
Critical Temperature -400.4°F (-240.2°C)
Critical Pressure 186 psia (12.7 atm)
Density, Liquid @ B.P., 1 atm 4.42 lb./cu.ft.
Density, Gas @ 68°F (20°C), 1 atm 0.005229 lb./cu.ft.
Specific Gravity, Gas (Air=1) @ 68°F (20°C), 1 atm 0.0696
Specific Gravity, Liquid @ B.P., [water=1 @ 68°F (20°C)] 0.0710
Specific Volume @ 68°F (20°C), 1 atm 191 cu. ft./lb.
Latent Heat of Vaporization 389 Btu/lb. mole
Flammable Limits @ 1 atm in air 4.00% - 74.2% (by Volume)
Flammable Limits @ 1 atm in oxygen 3.90% - 95.8% (by Volume)
Detonable Limits @ 1 atm in air 18.2% - 58.9% (by Volume)
Detonable Limits @ 1 atm in oxygen 15% - 90% (by Volume)
Autoignition Temperature @ 1 atm 1060°F (571°C)
Expansion Ratio, Liquid to Gas, B.P. To 68°F (20°C) 1 to 845

Cylinders and mobile tubes are manufactured according to DOT-3A or DOT-3AA specifications. Cylinders and mobile tubes are hydrostatically tested upon manufacture and tested periodically thereafter at 5/3 times the service pressure, as specified by DOT regulations.

Hydrogen may be stored in ASME coded and stamped, National Board registered high-pressure gas storage tubes are part of a stationary installation. These tubes are hydrostatically tested by the manufacturer but, unlike cylinders and mobile tubes, periodical hydrostatic testing is not required.

The Compressed Gas Association and the American National Standards Institute have recommended a thread size of 0.825 inch-14 external left-hand threads per inch, designated as valve connection No. 350. Further information on valves is provided in Air Products' Safetygram-23, "Cylinder Valves", and Safetygram-31, "Cylinder Valve Outlet Connections."

Pressure Relief Devices
Pressure relief devices provide protection against excessive pressure in the container. Pressure relief devices are integral parts of the cylinder valves. They are also recommended for use on pressurized systems. These devices take the form of frangible disks or pressure relief valves. Further information on pressure relief devices is provided in Safetygram-15.

Identification : Cylinders and Mobile Tubes
Each cylinder or mobile tube is identified by stampings in the metal of the cylinder shoulder. Figure 3 depicts an example of these markings and what they mean.

Shipment : Hydrogen Cylinders
The shipment of hydrogen cylinders by surface transportation must conform to DOT regulations as set forth in the Code of Federal Regulations, Title 49, which describes the marking, labeling, placarding, and shipping papers required. A DOT 4'' x 4'' red, flammable label, as illustrated in Figure 4, is required for common carrier shipments. For emergency response, refer to UN Number 1049 in the Department of Transportation's "Emergency Response Guide." Shipments by air must conform with Title 49 in the Code of Federal Regulations. Final acceptance for air transport is at the discretion of the airline.
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Key to Cylinder Stampings
Cylinder Specification
· DOT - Department of Transportation, which is the regulatory body that governs the use of cylinders.
· Specification of the cylinder type of material of construction (e.g., 3AA).
· Service or working pressure in pounds per square inch (e.g., 2,265 psi).

Cylinder Serial Number
· The letters SG precede the serial numbers for Specialty Gas cylinders

Registered Owner Symbol
· Symbol used to indicate the original owner of the cylinders.
· APROINC is a Registered Owner Symbol for Air Products.

Date of Manufacture
· This date (month-year) also indicates the original hydrostatic test.

Neck Ring Identification
· The cylinder neck ring displays the name of the current owner of the cylinder

Retest Markings
· The format for a retest marking is : Month-Facility-Year-Plus Rating-Star Stamp.
· The symbol (Plus Rating) indicates that the cylinder qualities for 10% overfill.
· The * symbol (Star Stamp) indicates that the cylinder meets the requirements for 10-year retest.
CylinderTrak™ Bar Code Label
· The CylinderTrak bar code label provides a unique cylinder identifier and is used by computer systems to track cylinders throughout the fill process. As an optional service, we have the capability of tracking cylinders to and from customers.

Cylinder Manufacturer's Inspection Marking

Cylinder Tare (Empty) Weight

Handling and Storage of Cylinders
1. Never drop cylinders or permit them to strike each other violently.
2. Cylinders should be assigned a definite area of storage. The area should be dry, cool, well-ventilated, and preferably fire-resistant. Keep cylinders protected from excessive temperature by storing them away from radiators or other sources of heat.
3. Cylinders may be stored in the open, but in such cases should be protected against extremes of weather and from damp ground to prevent rusting.
4. The valve protection cap should be left in place until the cylinder has been secured against a wall, a bench, or placed in a cylinder stand and is ready to be used.
5. Avoid dragging or sliding cylinders, even for short distances. Cylinders should be moved by using a suitable hand truck.
6. Do not use cylinders as rollers for moving material or other equipment.
7. Never tamper with safety devices in valves or cylinders.
8. When returning empty cylinders, close the valve before shipment. Leave some positive pressure in the cylinder. Replace any valve outlet and protective caps originally shipped with the cylinder. Mark and label the cylinder as "Empty". Do not store full and empty cylinders together.
9. No part of a cylinder should be subjected to a temperature above 125°F (52°C). Prevent sparks or flames from welding or cutting torches or any other source coming in contact with cylinders. Do not permit cylinders to come in contact with electrical apparatus or circuits.
10. Never permit oil, grease, or other readily combustible substances to come in contact with cylinders or valves.
11. Use regulators and pressure relief devices when connecting cylinders to circuits having lower pressure service ratings.
12. Smoking or open flames should be prohibited in hydrogen cylinder and tube storage and use areas.
13. Know and understand the properties, uses, and safety precautions of hydrogen before using the gas and associated equipment. Consult the Air Products Material Safety Data Sheet (MSDS) for safety information.
14. Always open a cylinder valve slowly. Never crack open a hydrogen cylinder to clear the valve of dust, as the escaping hydrogen may ignite.
15. Total storage capacity of an indoor hydrogen system should be limited to 3000 cubic feet or less.
16. Hydrogen storage inside a building should not be near oxidants or other combustible storage.
17. When finished with a cylinder, always close the valve. When work is to be interrupted for any length of time, the valve should be closed and all gas released from the hose and regulator to a safe location.
18. If a cylinder or valve is defective or leaking, remove the cylinder to a remote outdoor location away from possible sources of ignition, and post the area as to the hazard involved. Notify your supplier.
19. If a cylinder protective cap is extremely difficult to remove, do not apply excessive force or pry the cap loose with a bar inserted into the ventilation openings. Attach a label or tag to the cylinder identifying the problem and return the cylinder to the supplier.
20. Wrenches should not be used on valves equipped with a handwheel. If the valve is faulty, attach a label or tag to the cylinder identifying the problem and return the cylinder to the supplier.
21. Compressed gas cylinders should not be refilled except by qualified producers of compressed gases.
22. Shipment of a compressed gas cylinder filled without the consent of the owner is a violation of Federal Law.

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