Piping at drums should be arranged in conjuction with nozzle locations, platform arrangments and the drum’s location to related equipment. Piping should be positioned to facilitate the installation of supports, with sufficient flexibility to absorb any excessive stresses during operation.
Piping at tall vertical drums should be arranged as per tower guidelines. If required, piping at horizontal free standing 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 the structure should be supported from structural steel. Following figure shows typical pipe supports at horizontal drum.
Following figure shows a typical pump suction arrangement.
Relief valves that are open to the atmosphere on low elevated horizontal or vertical drums should be positioned to allow the discharge piping to be routed to a convenient, safe location.
Closed systems relief valves should be located at convenient platform adjacent to the drum above the relief valve header.
Relief valve inlet piping more than 20 ft (6100 mm) long should be checked by the systems engineering group to determine whether the line size needs to be increased for pressure drops.
Following drawing shows typical arrangement for both systems.
Piping arrangement drawing shown below is designed using the guidelines given in this chapter.
- Process vessel sketch.
- Nozzle locations
- Instrument vessel sketch.
- Equipment Arrangement
- Platform Arrangement
- Nozzle Summary
- Drum elevation
- Plant layout specification.