Rosemount 1495 - Page 34

Reference Manual
00809-0100-4792, Rev CA
August 2010
Rosemount 1495, 1496
4-8
Table 4-3. Class 900 Orifice Flanges, Welding Neck
(1)
Nominal
Pipe
Size
Out-
side
Diameter
of Raised
Face R
Out-
side
Diameter
of Flange
O
Thickness
of Flange,
Min. C
Length
Through
Hub Y
Ring Type Joint
Diameter
of Hub X
Hub
Diameter
Beginning
of Chamfer
A
Groove
Number
Pitch
Diameter
P
Groove
Depth E
Groove
Width F
Radius
at
Bottom
r
max
Special
Oval
Ring
Height
W
1
For Nominal Pipe Size (NPS) 2
1
/2 and smaller, use Class 1500.
1
1
/2
2
2
1
/2
3 5.00 9.50 1.50 4.00 R31 4.875 0.312 0.469 0.03 1.06 5.00 3.50
4 6.19 11.50 1.75 4.50 R37 5.875 0.312 0.469 0.03 1.06 6.25 4.50
6 8.50 15.00 2.19 5.50 R45 8.312 0.312 0.469 0.03 1.06 9.25 6.63
8 10.62 18.50 2.50 6.38 R49 10.625 0.312 0.469 0.03 1.06 11.75 8.63
10 12.75 21.50 2.75 7.25 R53 12.750 0.312 0.469 0.03 1.06 14.50 10.75
12 15.00 24.00 3.12 7.88 R57 15.000 0.312 0.469 0.03 1.06 16.50 12.75
14 16.25 25.25 3.38 8.38 R62 16.500 0.438 0.656 0.06 1.31 17.75 14.00
16 18.50 27.75 3.50 8.50 R66 18.500 0.438 0.656 0.06 1.44 20.00 16.00
18 21.00 31.00 4.00 9.00 R70 21.000 0.500 0.781 0.06 1.56 22.25 18.00
20 23.00 33.75 4.25 9.75 R74 23.000 0.500 0.781 0.06 1.56 24.50 20.00
24 27.25 41.00 5.50 11.50 R78 27.250 0.625 1.062 0.09 1.88 29.50 24.00
(1)
Nominal
Pipe Size
Bore B
Diameter
of
Pressure
Connection
TT
Drilling Template Length of Stud Bolts
(2)(3) (4)
Diameter of
Bolt Circle
Number of
Holes
Diameter of
Holes
Diameter of
Bolts
Raised Face Ring Joint
1
For Nominal Pipe Size (NPS) 2
1
/2 and smaller, use Class 1500.
1
1
/2
2
2
1
/2
3
3
/8 7.50 8 7.50
7
/8 6.00 6.50
4
1
/2 9.25 8 9.25 1
1
/8 7.00 7.50
6
1
/2 12.50 12 12.50 1
1
/8 7.75 8.25
8
1
/2 15.50 12 15.50 1
3
/8 9.00 9.50
10
1
/2 18.50 16 18.50 1
3
/8 9.50 10.00
12
1
/2 21.00 20 21.00 1
3
/8 10.25 10.75
14
1
/2 22.00 20 22.00 1
1
/2 11.00 11.50
16
1
/2 24.25 20 24.25 1
5
/8 11.50 12.00
18
1
/2 27.00 20 27.00 1
7
/8 13.00 13.75
20
1
/2 29.50 20 29.50 2 14.00 14.75
24
1
/2 35.50 20 35.50 2
1
/2 17.50 18.50
(1) All other dimensions are in accordance with ASME B16.5.
(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.
(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 0.25 in. for NPS 3-12 and 0.38 in. for NPS 14-24. Bolt lengths for
ring type joint flanges include allowance of 0.62 in. for NPS 3-10 and 0.75 in. for NPS 12.
(4) Bore is to be specified by the purchaser.
See Note
(4)
.