Information Required for Distillation Piping

The basic layout and general engineering specifications describe:

• The minimum access, walkways, platforms width and headroom requirements.
• Handling facilities for tower internals, manhole covers, line blinds, relief valves. 
• Maximum rise of ladders.
• Pipe-system requirements, such as open or closed relieving systems.
• Minimum line-size and required hose-stations. 
• Access to valves and instruments. 

Design Standards show: 

• Details of ladder dimensions 
• Ladder and platform position (Step through or side step landings) 
• Toe-plate, handrail and safety-gate details. 

P&ID and Technical specification of column provide :

• • Process data showing interconnected equipment and piping.
• • Pipe sizes and pipeline components.
• • Steam tracing and insulation thickness.
• • Tower elevations and differences in related equipment levels.

Plot Plan gives:

• The physical location of a column and its relationship to other equipment.
• Main access.
• Main pipe run or pipe rack.
• Location of pumps.

A Typical cross section of a pipe rack running through the tower of a refinery plant

Fabrication drawing/detail dimensional drg. of column provides :

• Diameter and height of column.

• Details and dimensions of internals.

• Manhole

• Process-piping connections in elevation (without orientation)

• Orum, pump, exchanger drawings giving details of adjacent process equipment or equipment supported on column itself.

A typical plan of equipments located in the refinery type of plants highlighting maintenance access

Instrument standard shows:

• The location of instrument connections to tower for gauges, level controllers and level alarms.
• Location of pressure and temperature connections without orientation.
• The instrumentation systems around the tower are depicted in the P&ID.

General Piping Arrangement of Column Piping

General Piping Arrangement of Column Piping

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