Question

Describe three major design considerations that must be considered for a gas pipeline running from Canada to Mexico.

Answer 1

The fluid flow equations and formulas presented thus far enable the engineer to initiate the design of a piping or pipeline system, where the pressure drop available governs the selection of pipe size. (In addition, there may be velocity constraints that might dictate a larger pipe diameter. This is discussed below in the section on velocity considerations for pipelines.

Once the inner diameter (ID) of the piping segment has been determined, the pipe wall thickness must be calculated. There are many factors that affect the pipe-wall-thickness requirement, which include:

• The maximum and working pressures
• Maximum and working temperatures
• Chemical properties of the fluid
• The fluid velocity
• The pipe material and grade
• The safety factor or code design application.

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