Level, Pressure and temperature instruments are used to control the operation of the drum and should be placed in a position for optimum operation and maintenance.
Instrument requirements are usually highlighted on a instrument vessel sketch furnished by the instrument engineer assigned to the project. 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.
The instrument arrangement shown below was designed using information as follows :
- Nozzle locations
- Instrument Vessel Sketch
- Platform Arrangement
- Piping Arrangement.