![]() ![]() Abbreviations used:Ī pipe Schedule chart or pipe size chart is provided in the following table with respect to nominal pipe size and pipe thicknesses. However stainless steel pipe can also be available in other schedules. Stainless steel pipe is more often available in standard weight sizes (noted by the “S” designation, for example, “NPS SCH 10S”). The tables in the respective codes are dimensionally complete for all sizes and wall thicknesses within its scope, but some of the larger, heavier wall sections are beyond the capability of seamless mill production and must be obtained from forged and bored billets or other sources. Dimensions (OD, ID, Thickness, and Schedule Number) and Weights of CS and SS pipes are given in the ASME standards mentioned above. The wall thickness associated with a particular schedule depends on the pipe size. Pipeline wall thickness calculation with example Pipe Schedule Chart: Pipe Size ChartĪ pipe size chart or pipe schedule chart is a tabular representation of pipe NPS and their thicknesses with respect to various schedule numbers. Pipe Thickness Calculation as per ASME B31.3 ![]() ![]() You may be interested in the following two articles: 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). After the calculation of minimum wall thickness, corrosion and mechanical allowances need to be added to that. The major parameters involved in thickness calculation are Design pressure, Pipe OD, and Allowable Stress at design temperature. All codes (B 31.3, B 31.1, IBR, B 31.4, B 31.8, nuclear code, etc.) provide equations for calculating the minimum wall thickness based on the pressure that the pipe has to withstand. The calculation of wall thickness varies depending on the usage of the code. ![]() Pipe Schedule / Pipe wall Thickness Calculation Pipe of sizes and wall thicknesses other than those of Standard, Extra-Strong, and Double Extra-Strong, and Schedule Number were adopted from API Specification 5L. With an increase in pipe thickness internal diameter of the pipe reduces as the pipe’s outer diameter remains constant.The double Extra Strong (XXS) wall is thicker than SCH 160 from NPS 1/8 to NPS 6, and SCH 160 is thicker than the XXS wall for NPS 8 and larger.All larger sizes of Extra-Strong have 12.70 mm wall thicknesses. Extra-Strong (XS) is identical to SCH 80 up to NPS 8.All larger sizes of Standard (STD Schedule) have 9.53 mm wall thicknesses. Standard (STD) is identical to SCH 40 up to NPS 10. ![]()
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