Pipe - DI, ANSI, Pressure Class (in)

Pipe - DI, ANSI, Pressure Class (in)

  • This is for the nominal thickness for standard pressure classes of ductile iron pipe.
  • Per ANSI/AWWA C150/A21.50 the thicknesses above include the 0.08" service allowance and the casting tolerance listed below by size ranges.
  • Dimensions and weights of thickness classes are found at Pipe - DI, ANSI, Thickness Class.
  • Pressure classes are defined as the rated water pressure of the pipe in psi.
  • The thicknesses shown are adequate for the rated water working pressure plus a surge allowance of 100 psi. Calculations are based on a minimum yield strength of 42,000 and a 2.0 safety factor times the sum of the working pressure and 100 psi surge allowance.
  • * Calculated thickness for these sizes and pressure ratings are less than those shown below. Presently these are the lowest nominal thicknesses available in these sizes.
Pipe Size

(NPS)

Outside Diameter

(in)

Pressure Class - Nominal Thickness (in)Casting Tolerances

(in)

150200250300350
3 3 31/32 - - - - 0.25 * 0.05
4 4 13/16 - - - - 0.25 * 0.05
6 6 29/32 - - - - 0.25 * 0.05
8 9 1/16 - - - - 0.25 * 0.05
10 11 3/32 - - - - 0.28 0.06
12 13 3/16 - - - - 0.28 0.06
14 15 5/16 - - 0.28 0.30 0.31 0.07
16 17 13/32 - - 0.30 0.32 0.34 0.07
18 19 1/2 - - 0.31 0.34 0.36 0.07
20 21 19/32 - - 0.33 0.36 0.38 0.07
24 25 13/16 - 0.33 0.37 0.40 0.43 0.07
30 32 0.34 0.38 0.42 0.45 0.49 0.07
36 38 5/16 0.38 0.42 0.47 0.51 0.56 0.07
42 44 1/2 0.41 0.47 0.52 0.57 0.63 0.07
48 50 13/16 0.46 0.52 0.58 0.64 0.70 0.08
54 57 9/16 0.51 0.58 0.65 0.72 0.79 0.09
60 61 5/8 0.54 0.61 0.68 0.76 0.83 0.09
64 65 21/32 0.56 0.64 0.72 0.80 0.87 0.09

 

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