Structure-supported platform arrangement

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. 

When specified, steam drums and deaerators are usually furnished as a proprietary item. Layout is limited to confirmation of nozzle and support locations to suit piping and structural configurations and platforming for operator and maintenance access. Exhibit 5-3 illustrates a typical deaerator arrangement. 

If required, piping at horizontal freestanding drums should be supported from the shell of the drum, the platform steel, or the concrete piers supporting the drum. Piping associated with drums located within structures should be supported from the struaural steel. Exhibit 5-24 shows tjpical pipe supports at a horizontal drum, and Exhibit 5-25 shows a typical pump suaion arrangement... 

Exhibit 12-27 illustrates two r ations of the structure generally found In a coker unit. As can be seen, the main operating valve platform is the only platform supported from the elevated concrete de in both arrangements. In one variation, the operator s penthouse is supported from the tqp of tte vessel, along with the entire drill struaure above the penthouse. This layout requires the coke drums to be designed to... 

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