Platform arrangements

Platforms are required at drums for access to valves, instruments, blinds, and maintenance accesses. Exhibit 5-17 illustrates a platform arrangement at a horizontal drum, and Exhibit 5-18 displays the arrangement for a vertical drum. 

For tall vertical drums, platforms are usually circular and supported by brackets attached to the shell of the drum. Platforms at horizontal drums are usually rectangular and are supported by brackets attached to the concrete piers supporting the drum or trunnions attached to the shell of the drum, or by struaural steel supported from grade. Drums located in structures, if size permits, use the struaure floor for access to controls. Top head platforms on horizontal and vertical installations are supported by trunnions attached to the vessel head. Generally, access to freestanding drum platforms is by ladder. Typical drum platform arrangements are shown in Exhibit 5-19. 

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 

Exhibit 5-23 depicts a horizontal drum platform arrangement that was designed using the guidelines in this chapter. This information can be found as follows.- 

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For towers with unusual platform arrangements, w may be estimated, or cut-and-try methods may be used. 

Pipirtg at drums should be arranged in conjunction with nozzle locations, platform arrangements, and the... 

Structures with stairs for operator and maintenance access. On reactors. shorter than 30 ft (9,150 mm), only a top-head platform is needed. Exhibits 9-17 through 9-21. show typical reactor platform arrangements. 

For example, the platform elevations shown on the process vessel sketch in Exhibit 10-3S> are the minimum requirements for instrument, valve, and maintenance access. Exhibit 10-50 displays a platform arrangement for the tower using the information in Exhibit 10-39 and the guidelines in this chapter. 

Fig. 165. Oil-hydraulic 2,300-ton extrusion press in four-column design with pump platform arranged above the main cylinder (By Lake Erie, Buffalo, USA)...

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