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    while using pressurised gas bottles, it is necessary to secure them using a chain, close to the base of the bottle, in order to prevent toppling

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    Welding

    What should I do when storing compressed gas cylinders? What should I avoid doing? What should I do with empty or out of service cylinders?

    Welding - Storage and Handling of Compressed Gas Cylinders

    Welding - Storage and Handling of Compressed Gas Cylinders What should I do when storing compressed gas cylinders?

    Check your jurisdiction for specific requirements, such as the fire code for guidelines regarding the storage of flammable gas cylinders.

    Store cylinders in a clearly identified, dry, well-ventilated storage area that is not exposed to heat or the direct rays of the sun, and away from doorways, aisles, elevators, gangways, and stairs.

    The temperature of the storage area should not be above 51.7°(125°F)

    Post "no smoking" signs in the area.

    Store cylinders, both empty and full, in the upright position and secure with an insulated chain or non-conductive belt to protect cylinders from falling or becoming damaged.

    During storage, close the cylinder valves with the protective caps in place.

    With outside storage, place on a fireproof surface and enclose in a tamper-proof enclosure.

    Protect cylinders from contact with ground, ice, snow, water, salt, corrosion, and high temperatures.

    Protect cylinders from falling. Consider securing each cylinder separately to prevent other cylinders from falling when items are removed from storage.

    Store acetylene and liquefied gas cylinders valve end up.  Close the valve, and keep the protective device in place.

    Store oxygen cylinders and fuel gas cylinders separately. Indoors, separate oxygen from fuel gas cylinders by at least 6.1 m (20 ft), or by a wall at least 1.5 m (5 ft) high with a minimum half-hour fire resistance. (From: CSA W117.2-19 "Safety in welding, cutting and allied processes". Local jurisdiction requirements may vary.)

    Cylinders must also be separated away from flammable and combustible liquids and from materials that easily ignite (such as wood, paper, oil, grease, etc.), including calcium carbide, by similar requirements as oxygen cylinders (6.1 m, or a fire wall at least 1.5 m high with ½ hr fire resistance).

    The building or room must be well ventilated.

    If oxygen cylinders are stored in an outdoor acetylene generator house, the cylinders must be separated from the generator and carbide storage room by a non-combustible barrier with a fire resistance rating of at least 1 hour, that has no openings and is gas tight.

    Note that when a single cylinder of oxygen and fuel gas are attached to a cylinder cart or secured to a wall or column at a workstation, this situation is not considered storage and the cylinders do not necessarily need to be separated by distance or a barrier.

    What should I avoid doing?

    Do not use a cylinder as an electrical ground connection.

    Do not fasten cylinders to a worktable or to structures where they could become part of an electrical circuit.

    Do not strike an arc on a cylinder.

    Do not use a flame or boiling water to thaw a frozen valve. Valves or cylinders may contain fusible plugs which can melt at temperatures below the boiling point of water. Warm water is acceptable.

    Do not use pry bars under valves or valve protection devices to pry cylinders loose when frozen to the ground. Use warm water.

    Do not place or store cylinders in unventilated enclosures such as lockers or cupboards.

    Do not use full or empty cylinders as rollers or supports.

    Do not tamper with or alter safety devices.

    Do not use a cylinder for any purpose other than to contain the gas for which the cylinder was designed.

    Do not place acetylene cylinders in a horizontal position.

    Do not accept compressed gas cylinders from the supplier unless they are properly labelled and have protective valve caps in place.

    Do not store oxygen in an indoor acetylene generator room.

    What should I do with empty or out of service cylinders?

    Mark or label them as "Empty cylinder".

    Return empties to the supplier.

    Remove regulators when not in use and store these away from grease and oil. Put protective caps on the fittings when in storage.

    Keep cylinders and fittings from becoming contaminated with oil, grease or dust.

    Do not use a cylinder that is not identified or if the label is not legible. The colours of industrial gas cylinders are not standardized.

    There may be situations where empty cylinders should be stored separately from full cylinders, such as at a hospital when selecting an empty oxygen container unintentionally is not desired.

    How should I move the cylinders?

    Close the valve before moving.

    Keep valve protection caps in place and hand tightened when not in use.

    To close the cylinder valves, remove the regulator and replace the valve protection cap and hand tight before moving a cylinder.

    Move cylinders with appropriate trolleys and secure the cylinders in an upright position.

    Use proper lifting cradles or a suitable platform when hoisting cylinders by a crane, derrick, or other hoisting mechanism.

    Call the supplier to remove leaky cylinders immediately.

    Secure cylinders in an upright position when cylinders are transported by motor vehicle. Close the value and use protective devices.

    DO NOT

    Do not lift a cylinder by the valve cap. Never sling with ropes or chains or lift with electromagnets.

    Do not drag, slide, or drop cylinders. Do not roll on their sides.They can be rolled for short distances on their base.

    स्रोत : www.ccohs.ca

    Are you Storing Your Compressed Gas Cylinders Safely?

    Improper storage of gas cylinders can be very hazardous because the compressed gas is under high pressure. The pressure is generally sufficient to forcefully propel the cylinder in the case of sudden pressure release. A sudden release of compressed gas can cause a cylinder to become a missile-like projectile and cylinders have been known to […]

    Are you Storing Your Compressed Gas Cylinders Safely?

    Improper storage of gas cylinders can be very hazardous because the compressed gas is under high pressure. The pressure is generally sufficient to forcefully propel the cylinder in the case of sudden pressure release. A sudden release of compressed gas can cause a cylinder to become a missile-like projectile and cylinders have been known to penetrate cinderblock walls!

    The Compressed Gas Association and NFPA 1 require that compressed gas cylinders be secured to prevent them from falling or being knocked over by securing them to a fixed object like a bench or wall, by use of a restraint such as a chain, strap, or bracket.

    One of the most common issues we see is two or more gas cylinders being secured to a wall bracket made only for one cylinder. There are a few options for storage alternatives. If wall space allows, a bracket designed for up to four standard-size cylinders could be used. If there are wall space constraints, another option is to purchase a gas cylinder storage rack. These come in various sizes and the larger models can store up to 12 standard size cylinders.

    A common misconception is that the nesting of gas cylinders is an acceptable means of securing them. Nesting is defined as each cylinder having three points of contact with either a wall or other gas cylinders. However, per NFPA 1, the nesting of gas cylinders is only allowed at gas distributors, filling facilities, or sellers’ warehouses, so it is not appropriate for storage in laboratories.

    Some other reminders to ensure safe gas cylinder storage:

    Attach chains or straps used to secure cylinders 2/3 of the way up on the cylinder

    Do not remove cylinder caps while the cylinder is in storage as they protect the valve on the top of the cylinder from damage if it’s knocked over

    Place cylinders in a location where they will not be subject to mechanical or physical damage, heat, or electrical circuits to prevent possible explosion or fire

    Segregate cylinders into hazard classes while in storage. Oxygen and other oxidizers must be separated from flammable gases or combustible materials by a minimum distance of 20 feet or by a non-combustible barrier at least five feet high with a fire-resistance rating of at least one-half hour

    Store gases in the order in which they are received and will be used

    Segregate empty cylinders from full cylinders

    One last reminder, don’t forget that small lecture bottle gas cylinders need to be properly stored too to protect them from damage, corrosion, and leaks. They should be stored in an upright position using an appropriate lecture cylinder stand. For additional information on safe gas cylinder storage, please email us at [email protected]

    This blog was written by Beth Graham, our Associate Director of Quality, Research, and Training.

    October 21, 2021 | Insights

    | Environmental Health & Safety (EHS), Office Safety Culture, OSHA, Safety Tips

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    स्रोत : www.safetypartnersinc.com

    V. Standards for Handling Compressed Gas Cylinders

    V. Standards for Handling Compressed Gas Cylinders

    A.   INTRODUCTION

    Users of compressed gases should be familiar with the pertinent equipment and the characteristics of the gases. Gases are supplied in cylinders under great pressures, some as much as several thousand pounds per square inch. If the valve is broken off the cylinder neck, the cylinder becomes a potentially deadly rocket, propelled with great momentum and high speed. Gas cylinders have been documented to cause extensive property damage, injury, and death. For this reason, all gas cylinders, full or empty, must always be strapped or chained to a sturdy support to prevent the cylinder from falling and breaking off the valve. All cylinders of compressed gas should be treated as high-energy sources and therefore regarded as potential explosives. The contents of a cylinder may also present such hazards as flammability, toxicity, corrosivity, excessive reactivity, and potential asphyxiation (if the volume of air displaced by the contents of the cylinder is sufficient).

    Compressed gas:

    Any material or mixture having in the container an absolute pressure greater than 40 psi at 70F or

    Regardless of pressure, one having an absolute pressure greater than 104 psi at 130F, or

    Any liquid material having a vapor pressure greater than 40 psi absolute at 100F

    Hazard Categories:

    The hazards of compressed gases can be categorized into the following basic hazards:

    Inerts which displace oxygen causing simple asphyxiation (e.g., nitrogen, argon, and helium)

    Toxics which cause adverse health effects depending on the type of gas, route entry, and dose. (e.g., phosgene and CO)

    Flammables which cause fire or explosion when ignited. (e.g., CO, CH4, and H2)

    Reactives which can be subdivided into:

    a.  Corrosives that erode and deteriorate human flesh, or equipment

    b.  Oxidizers that are not flammable by themselves, but which react violently with flammable or combustible materials

    *Many gases fall into more than one category

    Hazards can result from improper handling of gas cylinders and high pressure equipment, which exist in many University facilities. For example, a leaking cylinder could produce an atmosphere that is toxic, anesthetic, asphyxiating, or explosive; and in the event of a rapid escape, the cylinder becomes a randomly directed missile. The main purpose of properly handling compressed gases is, therefore, to prevent uncontrolled escape of the gas. All handling, storage and utilization of compressed gases must comply with the Compressed Gas Association Standards.

    The following information is offered in order to familiarize personnel with cylinder parts and terminology:Valve handwheel: used to open and close the cylinder valve. Valves are occasionally not equipped with handwheels and require special wrenches to effect operation.Valve pack nut: contains packing gland and packing around stem. Adjusted only occasionally; usually tightened if leakage is observed around valve stem. Should not be tampered with for diaphragm-type valves.Valve outlet connection: for connection to pressure-and/or flow-regulated equipment. Various types of connections are provided to prevent interchange of equipment for incompatible gases. Usually identified by a CGA (Compressed Gas Association) number, for example, No. 350 for hydrogen service.Safety device: to permit gas to escape if the temperature gets high enough to endanger the cylinder by increased unsafe pressures.Cylinder collar: holds cylinder cap (6) at all times, except when regulating equipment is attached to cylinder valve.Cylinder cap: to protect cylinder valve.DOT number: This number signifies that the cylinder conforms to Department of Transportation specification DOT-3A governing materials of construction, capacities, and test procedures; and that the service pressure for which the cylinder is designed is 2,000           pounds per square inch at 70F.Hydrostatic Test Date: This number indicates the date month and year of initial hydrostatic testing. Thereafter, hydrostatic pressure tests are performed on cylinders. For most gases this is done every five years to determine their fitness for further use. At this time, new test dates are stamped into the shoulder of the cylinder. Present regulations permit visual tests in lieu of hydrostatic tests for low-pressure cylinders for certain gases free of corrosive agents. Special permits allow for hydrostatic pressure tests at ten-year intervals for cylinders in high-pressure service for certain gases.Original inspector's insignia: for conducting hydrostatic and other required tests approve the cylinder under DOT specifications.Valve outlet cap: protects valve threads from damage and keeps outlet clean; not used universally.B.  GENERAL STANDARDS

    All cylinders must be marked as to content. Do not accept cylinders with unidentifiable contents.

    Unless the pressure regulator is attached, keep the valve protection cap on securely.

    Cylinders must be secured with heavy-duty chains, at about 1/3 and 2/3 the height of the cylinder (if only one chain is used, secure at 2/3 cylinder height, to prevent them from falling. Chains rather than straps should be used to ensure that cylinders remain upright in the event of a fire. Cylinder clamps anchored to a support wall or fixed lab bench should be used for securing cylinders. Never use unsecured tables, benches or chemical hoods to anchor cylinders.

    स्रोत : www.clemson.edu

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