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Welding safety
1.
Welding, Cutting, and
Brazing MODULE 16
2.
2 ©2006 TEEX Hazards
of Welding Operations Fire hazards Metal splatter Electric shock Explosion hazards Released gases Radiant energy Where would these hazards be found on oil and gas well sites?
3.
3 ©2006 TEEX Three
Basic Types of Welding Gas – Slower and easier to control than electric arc. Uses gas flame over metals until molten puddle is formed. Most popular fuels used with oxygen include acetylene, mapp gas, and hydrogen. Arc – Two metals are joined by generating an electric arc between a covered metal electrode and the base metal. Oxygen and Arc Cutting – Metal cutting in welding is the severing or removal of metal by a flame or arc.
4.
4 ©2006 TEEX Oxygen
and arc cutting Most common cutting processes : Oxygen Cutting: Metal is heated by gas flame and an oxygen jet does the cutting. Arc Cutting: Intense heat of electric arc melts away the metal.
5.
5 ©2006 TEEX Regulations
29 CFR 1910 Subpart Q General Industry 29 CFR 1926 Subpart J Construction API RP 54 Section 20 Hotwork, Welding, and Flame Cutting Operations
6.
General Requirements 29 CFR
1910.252
7.
7 ©2006 TEEX Fire
Prevention Safeguards Fire Hazards should be removed if the welded object cannot be readily moved. Guards should be used if removing fire hazards is not possible. Restrictions apply (no cutting or welding allowed) if none of the above is possible.
8.
Subtitles & Transitions FOR
EXAMPLE…
9.
9 ©2006 TEEX Special
Precautions Protect nearby combustible materials from sparks that might escape through openings in floors or walls. Fire Extinguishers must be ready for instant use. Fire Watch lasting at least 30 min after welding or cutting operations is required if more than a minor fire might develop and if certain combustible materials are present.
10.
10 ©2006 TEEX Special
Precautions Authorization: A responsible individual must inspect the area and designate precautions, preferably by written permit. Floors: Combustible materials must be swept 35 feet away; combustible floors must be wetted or protected (while preventing arc welding shock)
11.
11 ©2006 TEEX Special
Precautions Prohibited areas for welding: Unauthorized by management Where sprinklers are impaired Explosive atmospheres Near storage of large quantities of readily ignitable materials Relocation of Combustibles: Combustibles shall be moved 35 feet away or properly protected or shielded.
12.
12 ©2006 TEEX Special
Precautions Ducts: Ducts & conveyor systems that might carry sparks must be shut down. Combustible walls must be shielded or guarded. Noncombustible walls, partitions or ceilings (when welded) require opposite-side moving of combustibles or a fire watch. Combustible cover: No welding on certain metal building components having combustible covers or layers.
13.
13 ©2006 TEEX Special
Precautions Pipes (or any metal) close enough to combustibles to cause ignition by conduction may not be cut or welded. Management responsibilities: Establish proper areas and procedures Designate responsible individual Ensure training Advise contractors of hazards
14.
14 ©2006 TEEX Special
Precautions Supervisor responsibilities: Safety of equipment & procedures Determine combustibles & hazardous areas Protect combustibles from ignition through moving, shielding and scheduling Secure authorizations Give go-ahead to cutter or welder Ensure fire protection Ensure fire watches if required
15.
15 ©2006 TEEX Welding
or Cutting Containers Used containers must be cleaned of flammable materials or other materials that could release toxic of flammable vapors when heated. Venting & purging is required for hollow spaces or cavities.
16.
16 ©2006 TEEX Confined
Spaces Precautions must be taken during long* pauses in arc welding to prevent accidental contact of electrodes torch valve gas leaks in gas welding. *During lunch or overnight
17.
17 ©2006 TEEX Protection
of Personnel Railing or other suitable fall protection must be provided as required. Welding cable and other equipment must be kept clear of passageways, ladders and stairways. Eye protection and protective equipment of specific appropriate types must be worn. Nearby workers must be protected from arc welding rays.
18.
Subtitles & Transitions FOR
EXAMPLE…
19.
19 ©2006 TEEX Protection
of Personnel Work in confined spaces requires consideration of: Ventilation Securing cylinders and machinery Lifelines Electrode removal (arc welding) Gas cylinder shutoff (gas welding & cutting) Warning signs for hot metal
20.
20 ©2006 TEEX Health
Protection & Ventilation General requirements for protecting welders are based on 3 factors: Dimensions of space (especially ceiling height) in which welding is to be done Number of welders Possible evolution of hazardous fumes, gases, or dust according to the metals involved.
21.
21 ©2006 TEEX Natural
and Mechanical Ventilation Must not be restricted by screens Sufficient to keep concentrations <PEL Mechanical ventilation required for: Metals not described here Spaces <10,000 feet per welder Rooms with ceilings lower than 16 feet Confined spaces or areas with barriers to natural cross ventilation
22.
22 ©2006 TEEX Dilution
Ventilation Contaminant should travel away from breathing zone. Local exhaust ventilation may be more effective. Poor Fair Good Best
23.
23 ©2006 TEEX Ventilation
Confined space: ventilation first; respirators if ventilation impossible Specific rules for specific chemicals Outdoors: Just stay below PEL
24.
24 ©2006 TEEX Transmission
pipeline Special rules in 1910.252(d)(1) Special electric shock protection for wet conditions Pressure testing: Worker and public protection against blowing out or loose dirt Construction: API Std. 1104-1968 Flammable substance lines: API Std. PSD No. 2201-1963 X-ray inspection: ANSI Z54.1-1963
25.
25 ©2006 TEEX Oxygen-Fuel
Gas Welding & Cutting General Requirements Flammable mixtures of fuel gases and air or oxygen must be guarded against. Maximum pressures of 15 psi for acetylene must be observed (with certain rare exceptions). Approved apparatus. Competent personnel in charge of supply equipment
26.
26 ©2006 TEEX Cylinders
& Containers Approval & Marking: DOT compliant Legibly marked ANSI compliant connections Valve protection
27.
27 ©2006 TEEX Cylinders
& Containers: Storage Away from heat sources (such as radiators) When inside buildings: Well-protected, ventilated, dry location at least 20 ft from combustibles Assigned storage spaces, protected from damage & tampering When empty: closed valves When not in use: hand-tight valve protection caps
28.
28 ©2006 TEEX Oxygen
Storage Protect oxygen cylinders from fire hazards such as acetylene: Distance: ≥20 ft from fuel-gas cylinders or combustibles, or Barrier: ≥5 ft high noncombustible partition with half-hour fire- resistance rating
29.
29 ©2006 TEEX Arc
Welding & Cutting Use compliant equipment Special design for exposure to weather, flammable gases, marine conditions… Workmen who operate or maintain arc welding equipment shall be acquainted with the requirements of 1910.254 and 1910.252
30.
30 ©2006 TEEX Arc
Welding & Cutting Electrode holders when not in use must be kept from shocking people and objects. Protect against electric shock: Never use cables with splices within 10 feet (3 m) of the holder The welder should not coil or loop welding electrode cable around parts of his body Maintenance must ensure safety: Damaged cables & equipment must be replaced. Work and cables must be joined properly and have adequate insulation.
31.
31 ©2006 TEEX Operating
procedures Cylinders, cylinder valves, couplings, regulators, hose, and apparatus kept free from oily or greasy substances Oxygen cylinders shall not be handled with oily hands or gloves A jet of oxygen must never be permitted to strike an oily surface, greasy clothes, or enter a fuel oil or other storage tank
32.
37 ©2006 TEEX Operating
procedures Before connecting a regulator to a cylinder valve: Open the valve slightly; close immediately Open the valve while standing to one side of the outlet; never in front of it Never crack a fuel-gas cylinder valve near other welding work or near sparks, flame, or other possible sources of ignition
33.
38 ©2006 TEEX Operating
procedures Always open the cylinder valve slowly Never open an acetylene cylinder valve more than 1.5 turns of the spindle, and preferably no more than 3/4 of a turn
34.
39 ©2006 TEEX Hose
and hose connections Replace hose with leaks, burns, worn places, defects When parallel lengths of oxygen and fuel hose are taped together, not more than 4 of 12 inches covered by tape
35.
40 ©2006 TEEX Test
Your Knowledge How long must a fire watch continue? A radius of 35 feet. How far away must combustible materials be kept from welding? Who is responsible for making fire watchers available? During work in confined spaces, what must be left outside? Gas cylinders & welding machines. Supervisor. At least 30 minutes.
36.
41 ©2006 TEEX Examples
& Diagnosis
37.
Subtitles & Transitions FOR
EXAMPLE…
38.
Subtitles & Transitions FOR
EXAMPLE…
39.
Subtitles & Transitions FOR
EXAMPLE…
40.
Subtitles & Transitions FOR
EXAMPLE…
41.
Subtitles & Transitions FOR
EXAMPLE…
42.
Subtitles & Transitions FOR
EXAMPLE…
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