# Creation of a line list

 # Line list 

The line list contains material and operational information for every spool of pipe to be installed in the plant. This list not only contains the basic data for the analysis, it also serves as the checklist for the work completed. 

The following items are contained in the line list:

 • Line Number: This is actually an alphanumerical identification tag consisting of service type, size, and material specification group, but it is traditionally called a number. Every company has its own unique way of naming the line numbers. For instance, 12-FW-20123-B1A may be used to identify 12 in., feed water, located in area 20, pipe spool no. 123 that uses material specification B1A. • Fluid: The type of fluid handled.

 • From Point: Either the equipment name tag or the line number of the pipe from which the spool starts

. • To Point: Either the equipment name tag or the line number of the pipe to which the spool ends. • Operating Temperature: This is the normal operating temperature.

 • Operating Pressure: This is the normal operating pressure. Normal operating pressure and normal operating temperatures exist concurrently.

 • Design Temperature: The maximum sustained temperature expected during operations. This may not include the downtime service temperature experienced in dry out or steam out. 

• Design pressure: This is the maximum sustained pressure expected.

 • Flexibility Temperature: The temperature to be used in thermal flexibility analysis. This may include dry out or steam out temperature as well as upset temperatures. 

• Material Specification: The material group to be used.

 • Insulation: Insulation type and thickness. Sometimes, an insulation specification is called out instead.

 • Fluid Density: Fluid density or specific gravity under normal operating conditions. 

• Test Type: Pressure test to be conducted by water, air, or other means. 

• Flow Diagram: The drawing number of the flow diagram (or P&ID) in which the spool is included.

 • Special Remarks: Potential slug flow, vibration, and other conditions that require special attention.