Butt Weld Cap Metric Dimensions as per ASME B16.9

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Butt Weld Cap Dimensions

View dimensions in inches

NPS OD E T E1
1/2 21.3 25 4.57 25
3/4 26.7 25 3.81 25
1 33.4 38 4.57 38
1-1/4 42.2 38 4.83 38
1-1/2 48.3 38 5.08 38
2 60.3 38 5.59 44
2-1/2 73.0 38 7.11 51
3 88.9 51 7.62 64
3-1/2 101.6 64 8.13 76
4 114.3 64 8.64 76
5 141.3 76 9.65 89
6 168.3 89 10.9 102
8 219.1 102 12.7 127
10 273.0 127 12.7 152
12 323.8 152 12.7 178
NPS OD E T E1
14 355.6 165 12.7 191
16 406.4 178 12.7 203
18 457.0 203 12.7 229
20 508.0 229 12.7 254
22 559.0 254 12.7 254
24 610.0 267 12.7 305
26 660.0 267 NA NA
28 711.0 267 NA NA
30 762.0 267 NA NA
32 813.0 267 NA NA
34 864.0 267 NA NA
36 914.0 267 NA NA
38 965.0 305 NA NA
40 1016.0 305 NA NA
42 1067.0 305 NA NA
NPS OD E T E1
44 1118.0 343 NA NA
46 1168.0 343 NA NA
48 1219.0 343 NA NA

GENERAL NOTES:

(a) All dimensions are in inches.
(b) The shape of these caps shall be ellipsoidal and shall conform to the shape requirements as given in the ASME Boiler and Pressure Vessel Code.

NOTES:

(1) Length E applies for thickness not exceeding that given in column “Limiting Wall Thickness for Length, E.”
(2) Length E1 applies for thickness greater than that given in column “Limiting Wall Thickness” for NPS 24 and smaller. For NPS 26 and larger, length E1 shall be by agreement between the manufacturer and purchaser.

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