Chapter 296-307 Safety standards for agriculture.

(1) Portable outlet headers must not be used indoors except for temporary service where the conditions preclude a direct supply from outlets located on the service piping system.(2) Each outlet on the service piping from which oxygen or fuel-gas is withdrawn to supply a portable …

(1) Cylinder manifolds must be installed under the supervision of someone familiar with the proper practices of construction and use.(2) All component parts used in the methods of manifolding described in WAC 296-307-48023 must have the materials, design and construction approved…

(1) Piping and fittings must comply with Section 2, Industrial Gas and Air Piping Systems, of the American National Standard Code for Pressure Piping, ANSI B 31.1-1967, if they do not conflict with subsections (2) and (3) of this section.(2) Pipe must be at least Schedule 40 and …

(1) Joints in steel or wrought iron piping must be welded, threaded or flanged. Fittings, such as ells, tees, couplings, and unions, must be rolled, forged or cast steel, malleable iron or nodular iron. Gray or white cast iron fittings are prohibited.(2) Joints in brass or copper…

(1) Distribution lines must be installed and maintained in a safe operating condition.(2) Piping may be above or below ground. All piping must be run as directly as practical, protected against physical damage, with an allowance for expansion and contraction, jarring and vibratio…

(1) Underground pipe and tubing and outdoor ferrous pipe and tubing must be covered or painted with a suitable material for protection against corrosion.(2) Aboveground piping systems must be marked according to the American National Standard Scheme for the Identification of Pipi…

(1) Piping systems must be tested and proved gastight at 1-1/2 times the maximum operating pressure, and must be thoroughly purged of air before being placed in service. The material used for testing oxygen lines must be oil free and noncombustible. Flames must not be used to det…

Equipment shall be installed and used only in the service for which it is approved and as recommended by the manufacturer.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-48043, filed 10/20/20, effective 11/20/20. WSR 97-09-013, r…

Service piping systems must be protected by pressure relief devices set to function at not more than the design pressure of the systems and discharging upwards to a safe location.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-48…

(1) The fuel-gas and oxygen piping systems, including portable outlet headers must incorporate the protective equipment shown in Figures V-1, V-2, and V-3.When only a portion of a fuel-gas system is to be used with oxygen, only that portion must meet this requirement.(2) Approved…

(1) A check valve pressure regulator, hydraulic seal, or combination of these devices must be provided at each station outlet, including those on portable headers, to prevent backflow, as shown in Figures 1, 2, and 3 and designated as SF and SO.(2) When approved pipeline protecti…

(1) Hose for oxy-fuel gas service must meet the requirements of the Specification for Rubber Welding Hose, 1958, Compressed Gas Association and Rubber Manufacturers Association.(2) The generally recognized colors are red for acetylene and other fuel-gas hose, green for oxygen hos…

(1) Pressure-reducing regulators must be used only for the gas and pressures for which they are intended. The regulator inlet connections must meet the requirements of the Regulator Connection Standards, 1958, Compressed Gas Association.(2) When regulators or parts of regulators,…

[WSR 97-09-013, recodified as § 296-307-485, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-485, filed 10/31/96, effective 12/1/96.]

(1) All equipment must be installed by a qualified electrician according to the requirements of chapter 296-307 WAC Part T. There must be a safety-type disconnecting switch or a circuit breaker or circuit interrupter to open each power circuit to the machine, conveniently located…

(1) All portable welding guns must have suitable counter-balanced devices for supporting the guns, including cables, unless the design of the gun or fixture makes counterbalancing impractical or unnecessary.(2) All portable welding guns, transformers, and related equipment that i…

(1) Flash welding machines must have a hood to control flying flash. In cases of high production, where materials may contain a film of oil and where toxic elements and metal fumes are given off, ventilation must be provided according to WAC 296-307-50009 through 296-307-50029.(2…

A qualified person must perform a job hazard analysis on the operations to be performed on each welding machine to determine the safeguards and personal protective equipment that must be used for each job.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. W…

Qualified maintenance personnel must periodically inspect the equipment and maintain records of the inspections. The operator must be instructed to report any equipment defects to the supervisor and the use of the equipment must be discontinued until safety repairs have been comp…

[WSR 97-09-013, recodified as § 296-307-490, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-490, filed 10/31/96, effective 12/1/96.]

Note:The employer may ensure that equipment is designed for safety by choosing equipment that complies with the Requirements for Electric Arc-Welding Apparatus, NEMA EW-1-1962, National Electrical Manufacturers Association or the Safety Standard for Transformer-Type Arc-Welding M…

Open circuit (no load) voltages of arc welding and cutting machines should be as low as possible consistent with satisfactory welding or cutting being done. Following are the maximum limits:(1) For alternating-current machines:(a) Manual arc welding and cutting—80 volts.(b) Autom…

(1) A controller integrally mounted in an electric motor driven welder must be able to carry the rated motor current, must be able to make and interrupt stalled rotor current of the motor, and may serve as the running overcurrent device if provided with the number of over-current…

Arc welding equipment, including the power supply, must be installed according to the requirements of chapter 296-307 WAC Part T.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-49007, filed 10/20/20, effective 11/20/20. Statutory…

(1) The frame or case of the welding machine (except engine-driven machines) must be grounded according to the requirements of chapter 296-307 WAC Part T.(2) Conduits containing electrical conductors must not be used for completing a work-lead circuit. Pipelines must not be used …

(1) A disconnecting switch or controller must be provided at or near each welding machine without a switch or controller mounted as an integral part of the machine. The switch must meet the requirements of chapter 296-307 WAC Part T. Overcurrent protection must be provided as spe…

(1) Employees assigned to operate or maintain arc welding equipment must be acquainted with the requirements of WAC 296-307-490, 296-307-495, and 296-307-500; if doing gas-shielded arc welding, also Recommended Safe Practices for Gas-Shielded Arc Welding, A6.1-1966, American Weld…

(1) The operator should report any equipment defect or safety hazard to the supervisor and discontinue using the equipment until its safety is ensured. Repairs must be made only by qualified persons.(2) Machines that have become wet must be thoroughly dried and tested before bein…

[WSR 97-09-013, recodified as § 296-307-495, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-495, filed 10/31/96, effective 12/1/96.]

For more information on these basic precautions and the special precautions of WAC 296-307-49503, including fire protection and prevention responsibilities of welders, cutters, their supervisors (including outside contractors), and management, see the Standard for Fire Prevention…

When the nature of the work to be performed falls within the scope of WAC 296-307-49501(2), certain additional precautions may be necessary:(1) Wherever there are floor openings or cracks in the flooring that cannot be closed, precautions must be taken so that no readily combusti…

(1) No welding, cutting, or other hot work may be performed on used drums, barrels, tanks or other containers until they have been cleaned thoroughly enough to be certain that there are no flammable materials present or any substances such as greases, tars, acids, or other materi…

(1) When arc welding work is stopped for a substantial time, such as during lunch or overnight, all electrodes must 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.(2) In o…

[WSR 97-09-013, recodified as § 296-307-500, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-500, filed 10/31/96, effective 12/1/96.]

(1) Helmets or hand shields must be used during all arc welding or arc cutting operations, excluding submerged arc welding. Goggles should also be worn during arc welding or cutting operations to provide protection from injurious rays from adjacent work, and from flying objects. …

(1) Helmets and hand shields must be made of a material that is an insulator for heat and electricity. Helmets, shields and goggles must be not readily flammable and must be able to be sterilized.(2) Helmets and hand shields must be arranged to protect the face, neck and ears fro…

(1) Employees exposed to the hazards created by welding, cutting, or brazing operations must be protected by personal protective equipment according to the requirements of chapter 296-307 WAC Part H. Appropriate protective clothing required for any welding operation will vary wit…

(1) The employer must ensure that a welder or helper working on platforms, scaffolds, or runways is protected against falling by using railings, safety belts, life lines, or other equally effective safeguards.(2) Welders must place welding cable and other equipment so that it is …

Confined space. A relatively small or restricted space such as a tank, boiler, pressure vessel, or small compartment of a ship.(1) Confined spaces must be ventilated. For ventilation requirements see WAC 296-307-50011 through 296-307-50029.(2) When welding or cutting in a confine…

(1) The following three factors in arc and gas welding must be considered when determining the amount of contamination to which welders may be exposed:(a) Dimensions of space in which welding is to be done (especially ceiling height);(b) Number of welders; and(c) The possibility …

(1) Mechanical ventilation must be provided when welding or cutting is done on metals not covered in WAC 296-307-50019 through 296-307-50029 in the following locations:(a) In a space of less than 10,000 cubic feet per welder.(b) In a room with a ceiling height of less than 16 fee…

Mechanical local exhaust ventilation may be provided by either of the following:(1) Freely movable hoods intended to be placed by the welder as near as practical to the work being welded and provided with a rate of airflow sufficient to maintain a velocity in the direction of the…

(1) All welding and cutting operations carried on in confined spaces must be adequately ventilated to prevent the accumulation of toxic materials or possible oxygen deficiency. This applies to welders, helpers, and other employees in the immediate vicinity. All replacement air mu…

In confined spaces, welding or cutting involving fluxes, coverings, or other materials that contain fluorine compounds must be done according to WAC 296-307-50017.Fluorine compound. A compound that contains fluorine as an element in chemical combination, not as a free gas.Note:Th…

(1) In confined spaces welding or cutting involving zinc-bearing base or filler metals or metals coated with zinc-bearing materials must be done according to WAC 296-307-50017.(2) Indoors, welding or cutting involving zinc-bearing base or filler metals coated with zinc-bearing ma…

(1) In confined spaces, welding involving lead-base metals (erroneously called lead-burning) must be done according to WAC 296-307-50017.(2) Indoors, welding involving lead-base metals must be done according to WAC 296-307-50015.(3) In confined spaces or indoors, welding or cutti…

Welding or cutting indoors, outdoors, or in confined spaces involving beryllium-containing base or filler metals must be done using local exhaust ventilation and airline respirators unless atmospheric tests under the most adverse conditions have established that employee exposure…

(1) Welding or cutting indoors or in confined spaces involving cadmium-bearing or cadmium-coated base metals must be done using local exhaust ventilation or airline respirators unless atmospheric tests under the most adverse conditions have established that employee exposure is w…

Welding or cutting indoors or in a confined space involving metals coated with mercury-bearing materials, including paint, must be done using local exhaust ventilation or airline respirators unless atmospheric tests under the most adverse conditions have established that employee…

[WSR 97-09-013, recodified as § 296-307-520, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-520, filed 10/31/96, effective 12/1/96.]