1.2 Building Design Considerations
1.2.1 The building in which an overhead crane is to be installed must be designed with consideration given to the following points: The distance from the floor to the lowest overhead obstruction must be such as to allow for the required hook lift plus the distance from the saddle or palm of the hook in its highest position to the high point on the crane plus clearance to the lowest overhead obstructions. In addition, the distance from the floor to the lowest overhead obstruction must be such that the lowest point on the crane will clear all machinery or when necessary provide railroad or truck clearance under the crane. After determination of the building height, based on the factors above, the crane runway must be located with the top of the runway rail at a distance below the lowest overhead obstruction equal to the height of the crane plus clearance Lights. pipes, or any other objects projecting below the lowest point on the building truss must be considered in the determination of the lowest overhead obstruction. The building knee brace must be designed to permit the required hook approaches. Access to the cab or bridge walkway should be a fixed ladder, stairs, or platform requiring no step over any gap exceeding 12 inches.  Fixed ladders shall be in accordance with ANSI A14.3, Safety Requirements for Fixed Ladders.
1.3 Clearance
1.3.1 A minimum clearance of 3 inches between the highest point of the crane and the lowest overhead obstruction shall be provided.  For buildings where truss sag becomes a factor, this clearance should be increased.
1.3.2 The clearance between the end of the crane and building columns, knee braces or any other obstruction shall not be less than 2 inches with crane centered on runway rails.  Pipes, conduits etc. must not reduce this clearance. 
1.3.3 Where passageways or walkways are provided on the structure supporting the crane, obstructions on the supporting structure shall not be placed so that personnel will be struck by movement of the crane.  The accuracy of building dimensions is the responsibility of the owner or specifier of the equipment. 
1.4 Runway
1.4.1 The crane runway, runway rails, and crane stops are typically furnished by the purchaser unless specified. Top Running Runway Rails shall be straight, parallel, level and at the same elevation.  The center to center distance, and the elevation shall be within the tolerances given in the the table below. The runway rails should be standard rail sections or any other commercial rolled section with equivalent specifications of a proper size for the crane to be installed. Proper rail splices and hold down fasteners are to be provided.  Rail separation at joints shall not exceed 1/16 inches.  Floating rails are not recommended. The crane runway shall be designed with sufficient strength and rigidity to prevent detrimental lateral or vertical deflections.
The lateral deflection should not exceed Lr/400 based on 10% of maximum wheel load(s) without VIF.  Unless otherwise specified, the vertical deflection should not exceed Lr/600 based on maximum wheel load(s) with VIF.  Gantry and other types of special cranes may require additional considerations. 
Lr=Runway girder span being evaluated.