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Washington Administrative Code (Last Updated: November 23, 2016) |
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Title 296. Labor and Industries, Department of |
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Chapter 296-52. Safety standards for possession, handling, and use of explosives. |
Section 296-52-70025. Construction for Type 2 magazines.
Latest version.
- (1) Exterior, doors, and top openings.(a) The exterior and doors must be constructed of at least 1/4-inch steel and lined with a minimum of three-inch hardwood.(b) Magazines with top openings must have lids with water resistant seals or lids that overlap the sides by a minimum of one inch when closed.(2) Hinges and hasps. Hinges and hasps must be installed so they cannot be removed when the doors are closed and locked by:• Welding• RivetingOR• Bolting nuts on the inside of the door(3) Locks.(a) Each door must be equipped with:• Two mortise locks• Two padlocks fastened in separate hasps and staples• A combination of mortise lock and a padlock• A mortise lock that requires two keys to openOR• A three-point lock(b) Padlocks must have:• A minimum of five tumblers and a case hardened shackle with a minimum of 3/8-inch diameter• A minimum of 1/4-inch steel hoods constructed to prevent sawing or lever action on the locks, hasps, and staplesNote:These requirements do not apply to magazine doors that are adequately secured on the inside by means of a bolt, lock, or bar that cannot be operated from the outside.(4) Ventilation.• A two-inch air space must be left around ceilings and the perimeter of floors, except at doorways• Foundation ventilators must be at least four inches by six inches• Vents in the foundation, roof, or gables must be screened and offset(5) Exposed metal.• Sparking metal cannot be exposed below the top of walls in the storage facilities• All nails must be blind nailed, countersunk, or nonsparkingNote:The following are nonmandatory construction alternatives for magazine exteriors:– All steel and wood dimensions shown are actual thickness– The manufacturer's represented thickness may be used to meet the concrete block and brick dimensions.3/16• 3/16-inch steel lined with an interior of 4-inch hardwood.• 3/16-inch steel lined with:An interior of 7 inches of softwoodOR6 3/4 inches of plywood.• 3/16-inch steel lined with:An intermediate layer of 3-inch hardwoodANDAn interior lining of 3/4-inch plywood.1/8• 1/8-inch steel lined with an interior of 5-inch hardwood.• 1/8-inch steel lined with an interior of 9-inch softwood.• 1/8-inch steel lined with:An intermediate layer of 4-inch hardwoodANDAn interior lining of 3/4-inch plywood.• 1/8-inch steel lined with:A first intermediate layer of 3/4-inch plywood.A second intermediate layer of 3 5/8 inches well-tamped dry sandORSand/cement mixture.An interior lining of 3/4-inch plywood.• 5/8-inch steel lined with an interior of any type of nonsparking material.• 1/2-inch steel lined with an interior of at least 3/8-inch plywood.• 3/8-inch steel lined with an interior of 2-inch hardwood.• 3/8-inch steel lined with an interior of:3 inches softwoodOR2 1/4 inches of plywood.• 1/4-inch steel lined with:An interior of 5 inches of softwoodOR5 1/4 inches of plywood.• Any type of structurally sound fire resistant material lined with:An intermediate layer of 4-inch solid concrete blockOR4-inch solid brick or concreteANDAn interior lining of 1/2-inch plywood placed securely against the masonry lining.• Standard 8-inch concrete block with voids filled with well tamped sand/cement mixture.• Standard 8-inch solid brick.• Any type of structurally sound fire resistant material lined with an intermediate 6-inch space filled with:Well tamped dry sandORWell tamped sand/cement mixture.• Any type of fire resistant material lined with:A first intermediate layer of 3/4-inch plywood,A second intermediate layer of 3 5/8-inch well tamped dry sandORSand/cement mixture,A third intermediate layer of 3/4-inch plywood,A fourth intermediate layer of 2-inch hardwoodOR14 gauge steel and an interior lining of 3/4-inch plywood,8-inch thick solid concrete.