ASTM A403 WP304/L WP316/L WP310S WP321 B16.9 Stainless Steel Butt Welding End Cap
The cap is a fitting that simplifies sealing pressure vessels or ends of pipes in a system. They are also referred to as pipe ends because a Cap is used at the extreme end of a pipe. Caps, when attached correctly provide a leak-proof sealing. While several industrial sectors use these fittings to seal pipes or pressure vessels. The Caps may also be used to eliminate the presence of air blocks in pipes, particularly in lines carrying water. Often, they are used to protect the ends of a pipe from getting deformed or chipped by external forces. Moreover, the use of a Butt Welding End Cap can prevent damage of internal threads inside the pipe or tube.
Product Information
| Product Name | ASTM A403 B16.9 Butt Welding End Cap |
| Size Range | 1/2” to 48” |
| Wall Thickness | Sch5 to Sch160 XXS |
| Standards | ASTM A403 |
| Grade | WP304/L WP316/L WP310S WP321 |
| Manufacturing Standards | ASME B16.9 MSS-SP-43 |
ASME B16.9 End Cap Dimensions (mm)
The cap is used to seal an open end of the pipe. In piping engineering, the cap made in accordance with ASME B16.9 will be welded to the end and need not be included in the length dimension of the run of pipe.
| NPS | O.D
mm
inch | E [NOTE(1)]
mm
inch | E
mm
inch | E1 [NOTE(2)]
mm
inch |
| 1/2 | 21.3
0.84 | 25
1.00 | 4.57
0.18 | 25
1.00 |
| 3/4 | 26.7
1.05 | 25
1.00 | 3.81
0.15 | 25
1.00 |
| 1 | 33.4
1.32 | 38
1.50 | 4.57
0.18 | 38
1.50 |
| 1-1/4 | 42.2
1.66 | 38
1.50 | 4.83
0.19 | 38
1.50 |
| 1-1/2 | 48.3
1.90 | 38
1.50 | 5.08
0.20 | 38
1.50 |
| 2 | 60.3
2.38 | 38
1.50 | 5.59
0.22 | 44
1.75 |
| 2-1/2 | 73.0
2.88 | 38
1.50 | 7.00
0.28 | 51
2.00 |
| 3 | 88.9
3.50 | 51
2.00 | 7.62
0.30 | 64
2.50 |
| 3-1/2 | 101.6
4.00 | 64
2.50 | 8.13
0.32 | 76
3.00 |
| 4 | 114.3
4.50 | 64
2.50 | 8.64
0.34 | 76
3.00 |
| 5 | 141.3
5.56 | 76
3.00 | 9.65
0.38 | 89
3.50 |
| 6 | 168.3
6.62 | 89
3.50 | 10.92
0.43 | 102
4.00 |
| 8 | 219.1
8.62 | 102
4.00 | 12.70
0.50 | 127
5.00 |
| 10 | 273.0
10.75 | 127
5.00 | 12.70
0.50 | 152
6.00 |
| 12 | 323.8
12.75 | 152
6.00 | 12.70
0.50 | 178
7.00 |
| 14 | 355.6
14.00 | 165
6.00 | 12.70
0.50 | 191
7.50 |
| 16 | 406.4
16.00 | 178
7.00 | 12.70
0.50 | 203
8.00 |
| 18 | 457.0
18.00 | 203
8.00 | 12.70
0.50 | 229
9.00 |
| 20 | 508.0
20.00 | 229
9.00 | 12.70
0.50 | 254
10.00 |
| 22 | 559.0
22.00 | 254
10.00 | 12.70
0.50 | 254
10.00 |
| 24 | 610.0
24.00 | 267
10.50 | 12.70
0.50 | 305
12.00 |
| 26 | 660.0
26.00 | 267
10.50 | … | … |
| 28 | 711.0
28.00 | 267
10.50 | … | … |
| 30 | 762.0
30.00 | 267
10.50 | … | … |
| 32 | 813.0
32.00 | 267
10.50 | … | … |
| 34 | 864.0
34.00 | 267
10.50 | … | … |
| 36 | 914.0
36.00 | 267
10.50 | … | … |
| 38 | 965.0
38.00 | 305
12.00 | … | … |
| 40 | 1016.0
40.00 | 305
12.00 | … | … |
| 42 | 1067.0
42.00 | 305
12.00 | … | … |
| 44 | 1118.0
44.00 | 343
13.50 | … | … |
| 46 | 1168.0
46.00 | 343
13.50 | … | … |
| 48 | 1219.0
48.00 | 343
13.50 | … | … |
*NPS: Nominal Pipe Size; O.D: Outside Diameter at Bevel; E: Length [NOTE(1)]; E1: Limiting Wall Thickness for Length; E: Length[NOTE(2)].
Materials Chemical Compositions
ASTM A403 Stainless Steel Pipe Fittings refers to the material of forged and rolled austenitic stainless fittings for pressure pipes. Common grades are WP304/L, WP316/L. They can be used into many fields as engineering industry, energy conversion plants etc.
| Grade A | Composition (%) |
| Grade WP | UNS Designation | C | Mn | P | S | Si | Ni | Cr | Mo | Ti |
| WP304 | S30400 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-11.0 | 18.0-22.0 | ﹍ | ﹍ |
| WP304L | S30403 | 0.030E | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-12.0 | 18.0-22.0 | ﹍ | ﹍ |
| WP310S | S31008 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 19.0-22.0 | 24.0-26.0 | ﹍ | ﹍ |
| WP316 | S31600 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 | |
| WP316L | S31603 | 0.030E | 2.00 | 0.045 | 0.030 | 1.00 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 | ﹍ |
| Wp321 | S32100 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 9.0-12.0 | 17.0-19.0 | ﹍ | G |
Note:
Where a ellipsis(﹍)appears in the table, there is no requirement and the element need to be analyzed for or reported
The method of analysis for nitrogen shall be a matter of agreement between the purchaser and manufacturer
Columbium 0.10-0.30%; Vanadium 0.10-0.30%.
For small diameter or thin walls, or both, where many drawing passes are required, a carbon maximum of 0.04% is necessary in grades TP304L and TP316L. Small outside diameter tubes are defined as those less than 0.500in.(23.7mm) in outside diameter and light wall tubes as those less than 0.049in.(1.24mm) in average wall thickness
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ASTM A403 Stainless Steel Butt Weld Fittings End Cap WP316 WP304 Images
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