The statement 'The minimum required pipe wall thickness is based solely on pressure' is:

The statement 'The minimum required pipe wall thickness is based solely on pressure' is:

• A. True
• B. False
• C. Not specified
• D. Depends on material

Answer: (B)

The wall thickness isn’t determined by pressure alone. The minimum required thickness must account for how the pipe will behave under pressure (material strength at the design temperature and the geometry) and also how it will age in service. In API 570 practice, you determine a required thickness from the design pressure, pipe diameter, the material’s allowable stress at the design temperature, and joint efficiency, and then you add a corrosion allowance to cover thinning over the service life. Other factors, such as temperature effects on material strength and any expected external loads or fatigue considerations, can also influence the final minimum thickness. Because corrosion allowance and these additional factors are part of the calculation, the statement is false.

The wall thickness isn’t determined by pressure alone. The minimum required thickness must account for how the pipe will behave under pressure (material strength at the design temperature and the geometry) and also how it will age in service. In API 570 practice, you determine a required thickness from the design pressure, pipe diameter, the material’s allowable stress at the design temperature, and joint efficiency, and then you add a corrosion allowance to cover thinning over the service life. Other factors, such as temperature effects on material strength and any expected external loads or fatigue considerations, can also influence the final minimum thickness. Because corrosion allowance and these additional factors are part of the calculation, the statement is false.