Process

 Drawings:

 “Process and piping drawings grow from the schematic diagram”

Types of Process drawings:

Ther are three types of drawing

1.       Flow diagram (Process or Service)

2.       Piping and instrumentation diagram

3.       Piping drawing

Flow Diagram:

This is a flow sheet to understanding process drawings not to scale.

Describe rates of flow and other information such as pressure and temperature locate at drawing as a flag on line within a drawing or tabulated on a separate panel. For detail see fig-01

 

Fig-01

 

 

Piping and instrument diagram:

This indicate all process and service lines by adding instruments and control, equipment and data are necessary for the design group not to scale. May helpful for construction (shows process and service line between buildings and units), operation and modification of the process. Material balance data, flow rates, temperature, pressure, etc, piping fitting details are not shown, mechanical piping detail such as elbows, joints, and unions are inappropriate in P&ID. This includes line sizes and branching points from headers to be established and assist in planning pipe way. It also includes symbols of closures, separators, screens, strainers, steam traps, drip legs, vent, drain, valves, insulation, control stations, wastes, service system, utility stations, line designation sheets, or tables, notes for the line. See fig-02

 

Fig-02

 

Piping drawing:

“The the main purpose of drawings is to communicate information in a simple and explicit way”

 

Two types of view are used

1.       Orthographic (Plan and Elevation)

2.       Pictorial (Isometric view and Oblique presentation)

For reference see fig-03

 

Fig-03