# While pipe system Design many professional have their different role.

 #A piping system is designed in the following steps by different engineering's discipline. 

(1) Process Engineer- create process flow diagram.

(2) Material Specification Engineers- Categories the specifications of piping system based on process flow and reactivity of the contained fluid.

Each specifications is applicable to certain combination of fluid type , temp ranges and pressure ranges.

Material Specification Normally include - pipe material , pipe wall thickness for each pipe size, the corrosion and erosion allowance, flanges class , valves type, fittings and branch connection types, bolt material gasket type etc.

(3) System Engineers- Combines process flow diagram , materials specifications and Equipment data sheets to create operational Piping Diagrams.

They select the applicable material specification and determine the size of each line based on Flow quality, allowable pressure drop, and flow stability.

Piping diagrams are generally combined with the necessary instrument and control circuits to become piping and instrument diagrams (P&IDs).

Special items such as potential two-phase flow and slug-flow zones are also identified on these diagrams for special consideration in design and analysis.

In addition to the P&IDs, a line list covering all pipe spools is also constructed. This line list contains most of the design, upset, and operating parameters to be used in the layout, analysis, and fabrication of the piping system.

(4) Piping designers- prepare piping routing study, determine the pipe rack locations, and place the actual piping that connects to designated points. 

They layout and support the piping by following the rules and procedures set up by each individual company.

(5) Piping mechanical engineers- check the stresses and supports of the systems. 

Using the P&IDs, they develop operating modes so that all the expected operating conditions are properly analyzed. Proper supports and restraints are selected and placed to optimize the overall cost and performance of the systems.

 They also design or specify piping specialty items, such as expansion joints, flue heads, special connections, spring hangers, vibration supports, and so forth.