Calculation of Pipe Schedule

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The Pipe Schedule for a specific pipe size describes the pipe wall thickness.

If Schedule no. ?,? thickness ?.

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{ P = Design pressure, S = Allowable stress }

For any given pipe size and varying schedule numbers or thicknesses, its outside Diameter

• (OD) remains constant and its internal Diameter (ID) decreases.
• With an increase in thickness, the strength increases but its ID decreases.

Pipe Schedule numbers can be the same for different pipe sizes but that does not mean the pipe thickness is the same.

It may be the same or vary with respect to pipe sizes.

For example, a 6-inch Schedule 40 pipe has 7.11 mm thickness, while an 8-inch Schedule 40 pipe has 8.18 mm thickness means thickness is increasing even though both Schedule 40.

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The calculation of wall thickness varies depending on the usage of the code.

All codes (B31.3, B31.1, IBR, B31.4, B31.8, nuclear code, etc.) provide equations for calculating the minimum wall thickness based on the pressure that the pipe has to withstand.

Parameters for thickness calculation :

Design pressure, pipe OD and allowable stress at design temperature.

After the calculation of minimum wall thickness, corrosion, and mechanical allowances need to be added to that.

After that, the actual pipe thickness is selected (immediate higher size thickness of the calculated value) from ASME code tables depending on pipe material (CS or SS).

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