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Ring Type Joint Orifice plates

Ring Type Joint orifice plates are made to fit between B16.5 and B16.36 flanges. The male Ring joint of the orifice plates can come in Oval or Octagonal shape although oval is the more common of the two. RTJ orifice plate holders are generally made T-316 or T-304 stainless steel, however other materials can be available upon request. The Orifice plates come in three different styles. Integral (shown below), Snap-ring Style, and Holding-screw style. Ring Joint Orifice Plates come in the following flange ratings (click for dimensions):

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ANSI CLASS 300# - 600#
Line Size API Ring Nos. W A C D Approx. Gap
1/2 R-11 0.906 1.593 1.093 1.343 0.593
3/4 R-13 1.000 2.000 1.375 1.687 0.593
1 R-16 1.000 2.313 1.688 2.000 0.593
1-1/2 R-20 1.000 3.000 2.375 2.687 0.593
2 R-23 1.062 3.688 2.813 3.250 0.593
2-1/2 R-26 1.062 4.438 3.563 4.000 0.593
3 R-31 1.062 5.313 4.438 4.875 0.593
3-1/2 R-34 1.062 5.625 4.750 5.187 0.593
4 R-37 1.062 6.313 5.438 5.875 0.593
5 R-41 1.062 7.563 6.688 7.125 0.593
6 R-45 1.062 8.750 7.875 8.312 0.593
8 R-49 1.187 11.063 10.188 10.625 0.718
10 R-53 1.187 13.188 12.313 12.750 0.718
12 R-57 1.187 15.438 14.563 15.000 0.718
14 R-61 1.187 16.938 16.063 16.500 0.718
16 R-65 1.312 18.938 18.063 18.500 0.843
18 R-69 1.312 21.438 20.563 21.000 0.843
20 R-73 1.375 23.500 22.500 23.000 0.718
24 R-77 1.562 27.875 26.625 27.250 0.937
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ANSI CLASS 900#
Line Size API Ring Nos. W A C D Approx. Gap
1/2 R-12 1.000 1.875 1.250 1.562 0.593
3/4 R-14 1.000 2.063 1.438 1.750 0.593
1 R-16 1.000 2.313 1.688 2.000 0.593
1-1/2 R-20 1.000 3.000 2.375 2.687 0.593
2 R-24 1.062 4.188 3.313 3.750 0.531
2-1/2 R-27 1.062 4.688 3.813 4.250 0.531
3 R-31 1.062 5.313 4.438 4.875 0.593
4 R-37 1.062 6.313 5.438 5.875 0.593
5 R-41 1.062 7.563 6.688 7.125 0.593
6 R-45 1.062 8.750 7.875 8.312 0.593
8 R-49 1.187 11.063 10.188 10.625 0.656
10 R-53 1.187 13.188 12.313 12.750 0.656
12 R-57 1.187 15.438 14.563 15.000 0.656
14 R-62 1.437 17.125 15.875 16.500 0.718
16 R-66 1.562 19.125 18.500 17.875 0.843
18 R-70 1.687 21.750 20.250 21.000 0.875
20 R-74 1.562 23.750 22.250 23.000 0.750
24 R-78 2.000 28.250 26.250 27.250 0.906
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ANSI CLASS 1500#
Line Size API Ring Nos. W A C D Approx. Gap
1/2 R-12 1.000 1.875 1.250 1.562 0.593
3/4 R-14 1.000 2.063 1.438 1.750 0.593
1 R-16 1.000 2.313 1.688 2.000 0.593
1-1/2 R-20 1.000 3.000 2.375 2.687 0.593
2 R-24 1.062 4.188 3.313 3.750 0.500
2-1/2 R-27 1.062 4.688 3.813 4.250 0.500
3 R-35 1.062 5.813 5.375 4.938 0.500
4 R-39 1.062 6.813 5.938 6.375 0.500
5 R-44 1.062 8.063 7.188 7.625 0.500
6 R-46 1.187 8.813 7.812 8.312 0.562
8 R-50 1.437 11.250 10.000 10.625 0.718
10 R-54 1.437 13.375 12.125 12.750 0.718
12 R-58 1.687 15.875 13.875 15.000 0.750
14 R-63 1.875 17.500 15.500 16.500 0.781
16 R-67 2.125 19.625 17.375 18.500 1.000
18 R-71 2.125 22.125 20.563 21.000 1.000
20 R-75 2.125 24.250 21.750 23.000 0.875
24 R-79 2.437 28.625 25.875 27.250 1.125
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ANSI CLASS 2500#
Line Size API Ring Nos. W A C D Approx. Gap
1/2 R-13 1.000 2.000 1.375 1.687 0.593
3/4 R-16 1.000 2.313 1.688 2.000 0.593
1 R-18 1.000 2.688 2.063 2.375 0.593
1-1/2 R-23 1.062 3.688 2.813 3.250 0.500
2 R-26 1.062 4.438 3.563 4.000 0.500
2-1/2 R-28 1.187 4.825 3.875 4.375 0.562
3 R-32 1.187 5.500 4.500 5.000 0.562
4 R-38 1.312 6.813 5.562 6.187 0.593
5 R-42 1.437 8.250 6.750 7.500 0.593
6 R-47 1.437 9.750 8.250 9.000 0.593
8 R-51 1.687 11.875 10.125 11.000 0.750
10 R-55 2.000 14.625 12.375 13.500 0.812
12 R-60 2.125 17.250 14.750 16.000 0.875