A fire extinguisher will be provided in the immediate area of the Hot Work and be available for use at any time while the Hot Work is being conducted and during the watch time after the work is completed. Mounted fire extinguishers will serve as a backup should they be needed.
Photo: MS Clip Art
Photos: courtesy MS Clip Art
Step 2 preparation & safety starters
PREPARATION & SAFETY STARTERSM O D U L E 1 : P R E S E N T I N G H O W TO P R E PA R E H O T W O R K SA R E A S , I D E N T I F Y H A Z A R D S , & P E R M I S S I B L E L O C AT I O N S
PERSONAL PROTECTIVE EQUIPMENT• Welders and welders’ helpers must wear appropriate eye protection.• Work boots should be used that do not absorb dirt and grease which can create a flame up.• Jeans or other heavier materials are recommended for lower body protection.• Welding gloves are required for hand protection.• Lens of welding hoods, cutting goggles, and hand shields must: • Be arranged to protect face, neck and ears from radiant energy. • Be made of tempered glass and free of bubbles. • Have lens shade readily identified on glass. 3
PREPARATION• Fire extinguishers should be charged and available in the immediate area.• Air monitoring equipment should be made available to check for flammable atmospheres in confined spaces or in areas that have a potential to accumulate flammable atmospheres.
PREPARATION Fire Prevention & Protection• NFPA 51 B – “Standard for Fire Prevention in Use of Cutting and Welding Processes.”• Move all fire hazards away from work area.• Use guards (fire blankets, etc.) if fire hazards cannot be moved.
PREPARATION• Equipment must be in good condition and appropriate to the task.• Fire resistive tarpaulins, noncombustible screens, metal shields, and fire stop material for wall or floor openings should be provided as needed.
PREPARATION• The following precautions should be taken for the area within a 35 foot radius: • Floor should be swept and combustibles moved. • Floors made up of combustibles should be covered with tarpaulins or other noncombustible materials. • Greases and oils should be cleaned up or moved. • Flammable liquids such as paints, oils and lacquers should be removed.
PREPARATIONAll wall openings and floor openings must be covered.• Ductwork and duct openings must be sealed with metal covers or covered with fire resistant tarpaulins.• All doors must be closed or covered to prevent sparks from escaping * Exception - If the Hot Work area can be completely screened off with noncombustible materials to prevent sparks from escaping, the 35 foot area would be reduced to the area within the protective barriers.
HOT WORK HAZARDSFlying sparks are the main cause of fires and explosionsin welding and cutting. Sparks can travel up to 35 feetfrom the work area. Sparks and molten metal can travelgreater distances when falling.Sparks can pass through or become lodged incracks, clothing, pipe holes, and other small openings infloors, walls, or partitions which can cause fires to start.
HOT WORK HAZARDS Combustible Materials are anything that is combustible or flammable and is susceptible to ignition by cutting and welding. The most common materials likely to become involved in fire are those of combustible building construction such as the following:1. Floors, partitions, and roofs2. Wood, paper, textiles, plastics, chemicals, and flammable liquids and gases, and dusts.3. Ground cover such as grass and brush.
HOT WORK HAZARDSExplosion HazardWelding and cutting can cause explosions in spaces containingflammable gases, vapors, liquids, or combustible dusts, and tanksand vessels that contain or have held flammable substances. Above Courtesy U.S. CSB, Tanks involved in the 2006 accident that killed three workers
HOT WORK HAZARDS Physical and Health Hazards There are many hazards to the Hot Work operator (i.e. welder) associated with Hot Work such as: Burns, Sparks, Electric shock hazards, Optical (UV) radiation, Inhalation of welding fumes. Engineering controls, personal protective equipment, and safe work practices safeguards the welder from many physical and health hazards.
HOT WORK HAZARDS SUMMARY Hot Work can be dangerous because the tools used are highly portable sources of ignition that can be introduced into areas where ignition sources do not usually exist. Sparks, flame, or heat can travel great distances by various means and ignite combustibles in other areas far away from the Hot Work. There are also explosion, fire, and physical and health hazards associated with Hot Work as previously reviewed. The goal of Hot Work safety practices is to avoid bringing sparks, flame, or heat produced by the tool into contact with a source of fuel.
HOT WORK LOCATIONS Hot Work is allowed in two types of locations:1) Designated area is a permanent location approved for routine Hot Work operations made safe by removal of all possible sources of ignition that could be ignited by the Hot Work tool.2) Controlled Area is one in which safe conditions for Hot Work exist or where safe conditions can be created by moving or protecting combustibles.3) Non permissible location: Hot Work is never permitted in certain types of locations where safe conditions do not exist and cannot be created.
HOT WORK LOCATIONSDesignated Area is a permanent location approvedfor routine Hot Work operations made safe byremoval of all possible sources of combustion thatcould be ignited by the Hot Work tool.
HOT WORK LOCATIONS Controlled Area is a work area in which safe conditions for Hot Work exist or where safe conditions can be created by moving or protecting combustibles. A Hot Work permit is required in a controlled area. An example of a controlled area is in a building construction area where welding must take place and the work area has been made safe by removing all combustibles and implementing the requirements of the Hot Work permit in order to make it safe.
HOT WORK LOCATIONSNon- PermissibleArea(s)/Locationis a location which Hot Work isprohibited. • Fires and explosions caused by improperly conducted Hot Work can have deadly consequences. • In the last decade their have been numerous worker injuries and deaths in general industry that have resulted from not following proper Hot Work procedures.
HOT WORK LOCATIONS Non-permissible welding areas: areas not authorized by management; sprinklered buildings while such protection is impaired; in the presence of an explosive atmosphere, including improperly prepared drums that once contained flammable materials and; areas near storage of large quantities of exposed, readily ignitable materials.
HOT WORK LOCATIONS Hot Work shall not be attempted on: a partition, wall, ceiling or roof that has a combustible covering or insulation, or on walls or partitions of combustible sandwich-type panel construction and; pipes or other metal that is in contact with combustible walls, partitions, ceilings or roofs shall not be done if the work is close enough to cause ignition by conduction.
• Workers on platforms, scaffolds or open sided floors must be protected from falls with: • A guardrail system or lifeline. • Safety harnesses with lanyards.• Welding cable and hoses must be kept clear of passageways, ladders and stairways.
CONFINED SPACES To prevent accidental contact, when arc welding is to be suspended for any substantial period of time, all electrodes shall be removed from the holders and the holders carefully located so that accidental contact cannot occur and the machine be disconnected from the power source. All spaces must be vented and purged before welding.
CONFINED SPACESTo eliminate the possibility of gas escaping throughleaks or improperly closed valves: When gas welding or cutting, the torch valves shall be closed and the gas supply to the torch positively shut off at some point outside the confined space area whenever the torch is not to be used for a substantial period of time. When practical, the torch and hose shall also be removed from the confined space.
CONFINED SPACESWhen welding or cutting is being performed in any confined space, thegas cylinders and welding machines shall be left on the outside.Before operations are started, heavy portable equipment mounted onwheels shall be securely blocked to prevent accidental movement.
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