Platform and ladder elevation requirements

Platform elevations for drums are set by. the items that require operation and maintenance. On tall vertical and high elevated horizontal drums, the platform elevations are determined by a maximum ladder run of 30 ft (9,150 mm). Exhibit 5-20 illustrates horizontal drum platform and ladder elevation requirements. Platform floor space requirements are dictated by operator access to controls, instruments, and maintenance accesses. Exhibits 5-21 and 5-22 show platform floor space requitemene for horizontal and vertical... 

EXHIBIT 5 20 Horizomal Drum Platform and Ladder Elevation Requirements... 

Platform elevations for towers are set by the items that require operation and maintenance and by a maximum ladder run of 30 ft (9,150 mm). Exhibit 10-41 shows platform and ladder elevation requirements. 

Except when portable ladders are used to gain access to fixed ladders (such as those on utility towers, billboards, and other structures where the bottom of the fixed ladder is elevated to limit access), when two or more separate ladders are used to reach an elevated work area, the ladders shall be offset with a platform or landing between the ladders. (The requirements to have guardrail systems with toeboards for falling object and overhead protection on platforms and landings are set forth in subpart M of this part.)... 

A. There has been some confusion as to which OSHA standards apply to the use of scissor lifts. The aerial lift requirements ( 1926.453) incorporate by reference the definition of aerial lifts used in the American National Standards Institute (ANSI) A92.2-1969 standard. Therefore, the requirements in 1926.453 apply to equipment identified in that 1969 ANSI consensus standard as aerial lifts. The ANSI standard definition includes the following vehicle-mounted elevating and rotating work platforms extensible boom platforms, aerial ladders, articulating boom platforms, vertical towers, and a combination of any of the above. 

Orifice flanges need not be accessible from grade or a platform but should be positioned at a location and elevation that can be reached by a portable ladder. Care must be taken at horizontal banks of lines to allow for adequate space for side-oriented taps and, when required, close-coupled transmitters. liqjend-ing on service, orifice flanges can be mounted in the vertical and horizontal seaions of piping, as shown in Exhibit 14-21, or with specific upstream and downstream dimensional requirements, as shown in Exhibit 14-22. For less common flow instruments (e.g., Pitot tubes and Annubars), advice from the instrument engineer is necessary for location and dimensional requirements. 

General requirements. The use of a crane or derrick to hoist employees on a personnel platform is prohibited, except when the erection, use, and dismantling of conventional means of reaching the worksite, such as a personnel hoist, ladder, stairway, aerial lift, elevating work platform or scaffold, would be more hazardous or is not possible because of structural design or worksite conditions. 

Level controllers, switches, and gauges are either located individually or grouped from a common bridle or standpipe. The controller must be operable from grade or a platform switches, gauges, and pressure and temperature connections may be operable from a ladder if no platform is available at the required elevation. 

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