Reference Manual
00809-0100-4792, Rev CA
August 2010
4-11
Rosemount 1495, 1496
Table 4-5. Class 2500 Orifice Flanges, Welding Neck
Nominal
Pipe
Size
Out-
side
Diam-
eter of
Raised
Face R
Out-
side
Diam-
eter of
Flange O
Thickness
of Flange,
Min. C
Length
Through
Hub Y
Ring Type Joint
Diam-et
er of
Hub X
Hub Diam
eter
Beginning
of Chamfer
A
Groove
Number
Pitch
Diam-
eter P
Groove
Depth E
Groove
Width F
Radius
at
Bottom
r
max
Special
Oval
Ring
Height
W
1
2.00
6.25
1.50
3.62
R18
2.375
0.250
0.344
0.03
1.00
2.25
1.32
1.5
2.88
8.00
1.75
4.38
R23
3.250
0.312
0.469
0.03
1.06
3.12
1.90
2
3.62
9.25
2.00
5.00
R26
4.000
0.312
0.469
0.03
1.06
3.75
2.38
2.5
4.12
10.50
2.25
5.62
R28
4.375
0.375
0.531
0.06
1.19
4.50
2.88
3
5.00
12.00
2.62
6.62
R32
5.000
0.375
0.531
0.06
1.19
5.25
3.50
4
6.19
14.00
3.00
7350
R38
6.188
0.438
0.656
0.06
1.31
6.50
4.50
6
8.50
19.00
4.25
10.75
R47
9.000
0.500
0.781
0.06
1.31
6.50
4.50
8
10.62
21.75
5.00
12.50
R51
11.000
0.562
0.906
0.06
1.56
12.00
8.63
10
12.75
26.50
6.50
16.50
R55
13.500
0.688
1.188
0.09
1.88
14.75
10.75
12
15.00
30.00
7.25
18.25
R60
16.000
0.688
1.312
0.09
2.00
17.38
12.75
(1)
Nominal
Pipe
Size
Bore B
Diameter
of
Pressure
Conn-
ection TT
Drilling Template
Length of Stud Bolts
(2)(3)
Diameter of
Bolt Circle
Number of
Holes
Diameter of
Holes
Diameter of
Bolts
Raised Face
Ring Joint
1
1
/
4
4.25
4
1.00
7
/
8
6.00
6.25
(4)
1.5
1
/
4
5.75
4
1.25
1
1
/
8
7.00
7.50
2
1
/
4
6.75
8
1.12
1
7.25
7.75
2.5
1
/
4
7.75
8
1.25
1
1
/
8
8.00
8.50
3
3
/
8
9.00
8
1.38
1
1
/
4
9.00
9.50
4
1
/
2
10.75
8
1.62
1
1
/
2
10.25
10.75
6
1
/
2
14.50
8
2.12
2
13.75
14.50
8
1
/
2
17.25
12
2.12
2
15.25
16.00
10
1
/
2
21.25
12
2.62
2
1
/
2
19.25
20.25
12
1
/
2
24.38
12
2.88
2
3
/
4
21.25
22.50
(1) All other dimensions are in accordance with ASME B16.5.
(2) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 0.25 in. for NPS 1-12 and 0.38 in. for NPS 14-24. Bolt lengths for ring
type joint flanges include allowance of 0.62 in. for NPS 1-10, 0.75 in. for NPS 12-18, and 0.88 in. for NPS 20.
(3) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(4) Bore is to be specified by the purchaser.
See
Note
.
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