i understand that deflection is inevitable, but i would like there to be a little as possible. i probably won't ever lift over 600 lbs, but i want to make sure it's strong enough for any situation that i may create for myself. i need this system to safely lift 1200 to 1500 lbs with minimal deflection. i'm planning on using trollies to hang another beam perpendicular and below these 2 main beams from which to hang a hoist on another trolly. one beam 10' from the front of the building, and one beam 10' from the back. in other words, the 2 "I" beams would be 10' apart. these 2 "I" beams would each be placed 5' out from the center line of the 30' walls. i would like to place 2 "I" beams on top of the block from one 30' wall to the other, thus spanning a distance of 20'. before i put the roof on, i would like to install a hoist system to lift things like car engines, metal lathes, etc. If we can be of further assistance, please contact Wil Epps of my staff at (202) 219-8041.I'm building a shop at my house made of concrete block.
Thank you for your interest in occupational safety and health. However, the crane must not be loaded beyond its rated load except for test purposes as provided in 1910.179(k). Hoisting units on overhead and gantry cranes may have different rated loads. The rated load marking on a hoist must be located and arranged so that it is evident to the personnel responsible for the safe operation of the hoisting unit. In addition to marking the rated load for the bridge or gantry crane, if the crane has more than one hoisting unit, the employer can choose to mark the applicable rated load on the hoist or the load block.
Please be advised that if the crane has one hoisting unit, compliance with this standard is met when the rated load is plainly marked on each side of the crane at a location such as the bridge. With regard to rated load markings on overhead bridge and gantry cranes, you inquired whether capacity markings would be required on the hoist, trolley and bridge individually, and if so, would the markings be required to have the same load rating on each component. OSHA standard 1910.179(b)(5) states that "The rated load of the crane shall be plainly marked on each side of the crane, and if the crane has more than one hoisting unit, each hoist shall have its rated load marked on it or its load block and this marking shall be clearly legible from the ground or floor." This is in response to your January 19 letter requesting clarification of the Occupational Safety and Health Administration (OSHA) overhead and gantry crane standard.
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