Pipe wall thickness calculation per ASME B31.5

Pipe Wall Thickness Calculator - Per ASME B31.5, Refrigeration Piping Code

Internal Design Gauge Pressure, P    psig
Design Temperature, DT    deg.F
Pipe Material
Stress value for material from Table 502.3.1, S    ksi
Pipe Nominal Size and Schedule
Selected Pipe Outside Diameter, Do    in
Selected Pipe Nominal Wall Thickness, Tn    in
Selected Pipe Specified Minimum Wall Thickness, T    in
Coefficient for material, y (See Para 504.1.1)    eg y = 0.4
Sum of the mechanical, corrosion and erosion allowances, c    in
Pressure design wall thickness, t    in
Min. reqd thickness, including mech, corr, and erosion allowances, tm    in
Calculated y value for ductile nonferrous metals/steels, y_calc
Verify1: Verify y value for ductile nonferrous metals or steels
Verify2: Do/tm > 4 :
Verify3: Check if selected pipe is acceptable or not, T >= tm

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General Notes:

Note: Refer to the "Terms and Conditions" in the 'About' section before using the software.

1) 1) PipeSelect_B31_5 is a software program that can be used to determine the wall thickness of pipes based on internal pressure.

2) By choosing the appropriate pipe schedule for the selected pipe diameter, material, design temperature etc., the user can determine if the selected pipe is suitable for the internal pressure considered. Calculations presented are based on the listed version of ASME B31.5 Refrigeration Piping and Heat Transfer Components code.

3) A number of different material types and grades (steel) are available for use. The materials and their properties presented, are taken from the listed version of ASME B31.5 code. Additional materials may be added on request.
SL denotes seamless. W denotes welded. ERW denotes electric resistance welded. EFW denotes electric fusion welded.

4) Equations used :-
t = (P*Do)/(2*( S+P*y)) ; tm = t + c ;
y = coefficient for materials indicated: for ductile nonferrous materials, use y = 0.4 (see Note);
for ferritic steels, use y = 0.4 (see Note); for austenitic steels, use y = 0.4 (see Note). For cast iron, use y = 0.0.
Note: If Do/t is in the range of 4 to 6, use y = d/(d + Do) for ductile materials.
d = inside diameter of pipe, in. , excluding metal required for corrosion or erosion allowance, manufacturer's minus tolerance, and any allowance required for the depth of internal threads or grooves.

5) Suggested thread allowance from ASME B1.20.1 - 2013 Ed.
Pipe Nominal Size Height of thread, h (thread allowance) (in)
1/2             0.05714
3/4             0.05714
1             0.06957
1-1/2          0.06957

6) Pressure calculations are based on internal pressure only. When external pressure / other loadings need to be considered, the user needs to consult appropriate code sections.

7) Minimum Design Metal Temperature (MDMT) needs to be verified in accordance with the code section by the user.

8) The Program is based on ASME B31.5 Code - 2016 Ed.

9) If you notice any error, please let us know, so that can be rectified.

10) Contact us with any comments / questions : engineeringstream11@gmail.com

11) Visit us for more software programs at https://engineering-stream.com