ANSI/ASSE A10.20:2006 pdf download.American National Standard for Construction and Demolition Operations.
3.3 Factor of Safety (Safety Factor). The ratio of structural ultimate or yield stress to the allowable stress. Factor of safety is equal to structural ultimate or yield stress divided by the allowable stress. When the safety factor is based on yield stress, as for structural steel, it is lower than those safety factors based on the ultimate breaking strength of the materials. The safety factor for lumber is computed on the basis of the average value of the modulus of rupture
3.4 GuardlGuarded. A guard will isolate people from unsafe conditions by being designed and constructed to provide positive protection: prevent all access to the danger zone during operations: cause the operator no discomfort or inconvenience:
operate automatically: be suitable for the job or machine; constitute a built-in feature:
provide for maintenance, inspection, adjustment and repairs: withstand the life cycle of the job or machine: be durable: not constitute a hazard by themselves and protect against unforeseen operational contingencies.
3.5 Guard RailiRailing SystemlStair
Railing System. Framework of vertical, horizontal or inclined members, gnllwork or panels, or combinations thereof, supporting a handrail and acting as a safety barrier for protection of persons at or near the outer edge of stair, ramp, landing, platform. hatchway, manhole or floor opening Reference ANSI)ASSE A1264.1, Safety Requirements for Workplace Floor and Wall Openings. Stairs and Railing Systems
3.6 NIOSH. National Institute for Occupational Safety and Health.
3.7 Qualified Persons. Those people who, by profession or a recognized degree. certificate and professional standing, or by extensive knowledge, training and experience, have demonstrated their ability to solve or resolve problems related to the subject matter of this standard.
4.3 Storage Facilities.
4.3.1 Bagged Material. Storage facilities for bagged material shall be carefully selected. The maximum storage capacity of the surface/floor shall be determined and clearly indicated only after thorough investigation of the strength of the structure and its foundation except that this shall not be required for slabs on grade. Bags outer surface shall have a coefficient of friction of 0.5 or greater.
4.3.2 Access for Forklift. When forklift trucks are to be used, access facilities for forklift trucks, including ramps and aisles, shall be 3 feet plus the width of the fork truck. Aisles shall be kept clear. Back up alarms with disconnecting seat break switch, seat belts, offset controls or guarded contro’s from inadvertent operation and dual rear view mirrors shall be installed on the fork truck.
4.3.3 Stacking of Bagged Materials. Bagged materials shall be stacked in an orderly manner to maintain stable piles by stepping back the layers and cross keying the bags at least every ten bags high. Sacks shall be removed uniformly from the top of the piles to avoid tipping the stack. Employees shall not climb on the stacks.
4.4 Transfer Equipment. Mechanical material handling equipment to move bagged materials shall be recommended for bags over 50 pounds.
4.5 Housekeeping. Broken pallet. crates, packing materials and empty bags shall be disposed of promptly to eliminate fire and tripping hazards. Returnable pallets shall be stored flat in an orderly manner. Flammable material shall be stored outside of the structure, and flammable materials shall be limited to a one day supply at the work area.
