Orifice Flange is a like any other flange with an introduction of a screwed opening over the thickness of the flange termed as orifice for connecting a flow meter measuring the differential flow rate over the two mated flange.

Why Orifice Flange?
Orifice flange is useful for introducing the orifice for measuring flow meter over the flanges and facilitating the disengagement of the flanges for purpose of inspection or replacement service.

Manufacturing Orifice Flange
Orifice Flange are either forged or manufactured by machining a plate cut pharma. Forging stock, either bar or plate is upset forged to form a blank piece of circle and machining to required dimensions, bolting holes & flange facing. Low pressure blind flanges are usually plate formed. Forged Orifice Flange are used for high pressure applications.

Material for Orifice Flange
Orifice Flanges are manufactured in almost all known ferrous & non-ferrous alloys but more commonly in Stainless Steel, Carbon Steel & Chrome Moly Alloy Steel.

Applications of Orifice Flange

Orifice Flanges are used for pipelines with high pressure ratings confined to High Pressure Fuel Transportation, Toxic Gas Pipelines, Fuel Oil & Gas Transportation Pipelines, High Pressure Steam & Air Pipelines, Heavy Fabrication & similar Industries.

Dimensions Orifice Flanges, WELD NECK, ANSI CLASS 300, ASME B16.36, RAISED FACE (IN) DATASHEET

  • Dimensions to ASME B16.36 – Orifice Flanges
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • All dimensions except “Thickness of Flange C sizes 1” are the same as a Weld Neck.
  • Approximate weight is based on a orifice flange union which is a set of flanges, plate not included.

data wnf orifice b16.36 300 1data wnf orifice b16.36 300 2data wnf orifice b16.36

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Weld


H

Diameter

of Hub

at Base


J

Length

of Hub

 


K

Number

of

Bolt

Holes

Diameter

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

Per

Union

(lb)

1/2
3/4
1 4 7/8 2 1 1/2 1.049 1.315 2 1/8 2 7/16 4 3/4 3 1/2 18
1 1/4 5 1/4 2 1/2 1 1/2 1.380 1.660 2 1/2 2 9/16 4 3/4 3 7/8 20
1 1/2 6 1/8 2 7/8 1 1/2 1.610 1.900 2 3/4 2 11/16 4 7/8 4 1/2 25
2 6 1/2 3 5/8 1 1/2 2.067 2.375 3 5/16 2 3/4 8 3/4 5 27
2 1/2 7 1/2 4 1/8 1 1/2 2.469 2.875 3 15/16 3 8 7/8 5 7/8 35
3 8 1/4 5 1 1/2 3.068 3.500 4 5/8 3 1/8 8 7/8 6 5/8 43
3 1/2
4 10 6 3/16 1 1/2 4.026 4.500 5 3/4 3 3/8 8 7/8 7 7/8 66
5 11 7 5/16 1 1/2 5.047 5.563 7 3 7/8 8 7/8 9 1/4 78
6 12 1/2 8 1/2 1 1/2 6.065 6.625 8 1/8 3 7/8 12 7/8 10 5/8 106
8 15 10 5/8 1 5/8 7.981 8.625 10 1/4 4 3/8 12 1 13 152
10 17 1/2 12 3/4 1 7/8 10.020 10.750 12 5/8 4 5/8 16 1 1/8 15 1/4 216
12 20 1/2 15 2 12.oo 12.750 14 3/4 5 1/8 16 1 1/4 17 3/4 327
14 23 16 1/4 2 1/8 13.25 14.00 16 3/4 5 5/8 20 1 1/4 20 1/4 448
16 25 1/2 18 1/2 2 1/4 15.25 16.00 19 5 3/4 20 1 3/8 22 1/2 596
18 28 21 2 3/8 17.25 18.00 21 6 1/4 24 1 3/8 24 3/4 741
20 30 1/2 23 2 1/2 19.25 20.00 23 1/8 6 3/8 24 1 3/8 27 887
22 33 25 1/4 2 5/8 21.25 22.00 25 1/4 6 1/2 24 1 5/8 29 1/4 1040
24 36 27 1/4 2 3/4 23.25 24.00 27 5/8 6 5/8 24 1 5/8 32 1311

Dimensions Orifice Flanges, WELD NECK, ANSI CLASS 400, ASME B16.36, RAISED FACE (IN) DATASHEET

  • Dimensions to ASME B16.36 – Orifice Flanges
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • All dimensions except “Thickness of Flange C sizes 1” are the same as a Weld Neck.
  • Approximate weight is based on a orifice flange union which is a set of flanges, plate not included.

data wnf orifice b16.36 400 2500 1data wnf orifice b16.36 400 2500 2data wnf orifice b16.36

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Weld


H

Diameter

of Hub

at Base


J

Length

of Hub

 


K

Number

of

Bolt

Holes

Diameter

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

Per

Union

(lb)

1/2
3/4
1 4 7/8 2 1 1/2 * 1.315 2 1/8 2 7/16 4 3/4 3 1/2 18
1 1/4 5 1/4 2 1/2 1 1/2 * 1.660 2 1/2 2 5/8 4 3/4 3 7/8 20
1 1/2 6 1/8 2 7/8 1 1/2 * 1.900 2 3/4 2 3/4 4 7/8 4 1/2 25
2 6 1/2 3 5/8 1 1/2 * 2.375 3 5/16 2 7/8 8 3/4 5 27
2 1/2 7 1/2 4 1/8 1 1/2 * 2.875 3 15/16 3 1/8 8 7/8 5 7/8 35
3 8 1/4 5 1 1/2 * 3.500 4 5/8 3 1/4 8 7/8 6 5/8 43
3 1/2
4 10 6 3/16 1 3/8 * 4.500 5 3/4 3 1/2 8 1 7 7/8 82
5 11 7 5/16 1 1/2 * 5.563 7 4 8 1 9 1/4 101
6 12 1/2 8 1/2 1 5/8 * 6.625 8 1/8 4 1/16 12 1 10 5/8 136
8 15 10 5/8 1 7/8 * 8.625 10 1/4 4 5/8 12 1 1/8 13 213
10 17 1/2 12 3/4 2 1/8 * 10.750 12 5/8 4 7/8 16 1 1/4 15 1/4 309
12 20 1/2 15 2 1/4 * 12.750 14 3/4 5 3/8 16 1 3/8 17 3/4 429
14 23 16 1/4 2 3/8 * 14.00 16 3/4 5 7/8 20 1 3/8 20 1/4 554
16 25 1/2 18 1/2 2 1/2 * 16.00 19 6 20 1 1/2 22 1/2 705
18 28 21 2 5/8 * 18.00 21 6 1/2 24 1 1/2 24 3/4 863
20 30 1/2 23 2 3/4 * 20.00 23 1/8 6 5/8 24 1 5/8 27 1066
22 33 25 1/4 2 7/8 * 22.00 25 1/4 6 3/4 24 1 3/4 29 1/4 1120
24 36 27 1/4 3 * 24.00 27 5/8 6 7/8 24 1 7/8 32 1555

Dimensions Orifice Flanges, WELD NECK, ANSI CLASS 600, ASME B16.36, RAISED FACE (IN) DATASHEET

  • Dimensions to ASME B16.36 – Orifice Flanges
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • All dimensions except “Thickness of Flange C sizes 1” are the same as a Weld Neck.
  • Approximate weight is based on a orifice flange union which is a set of flanges, plate not included.

data wnf orifice b16.36 400 2500 1data wnf orifice b16.36 400 2500 2data wnf orifice b16.36

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Weld


H

Diameter

of Hub

at Base


J

Length

of Hub

 


K

Number

of

Bolt

Holes

Diameter

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

Per

Union

(lb)

1/2
3/4
1 4 7/8 2 1 1/2 * 1.315 2 1/8 2 7/16 4 3/4 3 1/2 5
1 1/4 5 1/4 2 1/2 1 1/2 * 1.660 2 1/2 2 5/8 4 3/4 3 7/8 18
1 1/2 6 1/8 2 7/8 1 1/2 * 1.900 2 3/4 2 3/4 4 7/8 4 1/2 20
2 6 1/2 3 5/8 1 1/2 * 2.375 3 5/16 2 7/8 8 3/4 5 27
2 1/2 7 1/2 4 1/8 1 1/2 * 2.875 3 15/16 3 1/8 8 7/8 5 7/8 35
3 8 1/4 5 1 1/2 * 3.500 4 5/8 3 1/4 8 7/8 6 5/8 43
3 1/2
4 10 3/4 6 3/16 1 1/2 * 4.500 6 4 8 1 8 1/2 103
5 13 7 5/16 1 3/4 * 5.563 7 7/16 4 1/2 8 1 1/8 10 1/2 157
6 14 8 1/2 1 7/8 * 6.625 8 3/4 4 5/8 12 1 1/8 11 1/2 195
8 16 1/2 10 5/8 2 3/16 * 8.625 10 3/4 5 1/4 12 1 1/4 13 3/4 278
10 20 12 3/4 2 1/2 * 10.750 13 1/2 6 16 1 3/8 17 454
12 22 15 2 5/8 * 12.750 15 3/4 6 1/8 20 1 3/8 19 1/4 553
14 23 3/4 16 1/4 2 3/4 * 14.00 17 6 1/2 20 1 1/2 20 3/4 815
16 27 18 1/2 3 * 16.00 19 1/2 7 20 1 5/8 23 3/4 1113
18 29 1/4 21 3 1/4 * 18.00 21 1/2 7 1/4 20 1 3/4 25 3/4 1306
20 32 23 3 1/2 * 20.00 24 7 1/2 24 1 3/4 28 1/2 1350
22 34 1/4 25 1/4 3 3/4 * 22.00 26 1/2 7 3/4 24 1 7/8 30 5/8 1545
24 37 27 1/4 4 * 24.00 28 1/4 8 24 2 33 2320

Dimensions Orifice Flanges, ANSI CLASS 900, ASME B16.36, RAISED FACE (IN) DATASHEET

  • Dimensions to ASME B16.36 – Orifice Flanges
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • All dimensions except “Thickness of Flange C sizes 1” are the same as a Weld Neck.
  • Approximate weight is based on a orifice flange union which is a set of flanges, plate not included.

data wnf orifice b16.36 400 2500 1data wnf orifice b16.36 400 2500 2data wnf orifice b16.36

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Weld


H

Diameter

of Hub

at Base


J

Length

of Hub

 


K

Number

of

Bolt

Holes

Diameter

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

Per

Union

(lb)

1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3 9 1/2 5 1 1/2 * 3.500 5 4 8 1 7 1/2 79
3 1/2
4 11 1/2 6 3/16 1 3/4 * 4.500 6 1/4 4 1/2 8 1 1/4 9 1/4 129
5 13 3/4 7 5/16 2 * 5.563 7 1/2 5 8 1 3/8 11 207
6 15 8 1/2 2 3/16 * 6.625 9 1/4 5 1/2 12 1 1/4 12 1/2 263
8 18 1/2 10 5/8 2 1/2 * 8.625 11 3/4 6 3/8 12 1 1/2 15 1/2 445
10 21 1/2 12 3/4 2 3/4 * 10.750 14 1/2 7 1/4 16 1 1/2 18 1/2 634
12 24 15 3 1/8 * 12.750 16 1/2 7 7/8 20 1 1/2 21 872

Dimensions Orifice Flanges, WELD NECK, ANSI CLASS 1500, ASME B16.36, RAISED FACE (IN) DATASHEET

  • Dimensions to ASME B16.36 – Orifice Flanges
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • All dimensions except “Thickness of Flange C sizes 1” are the same as a Weld Neck.
  • Approximate weight is based on a orifice flange union which is a set of flanges, plate not included.

data wnf orifice b16.36 400 2500 1data wnf orifice b16.36 400 2500 2data wnf orifice b16.36

Pipe Size

(NPS)

Outside

Diameter

of

Flange

A

Diameter

of

Raised

Face

B

Thickness

of

Flange


C

Diameter

of

Bore


D

Diameter

of Hub

at Weld


H

Diameter

of Hub

at Base


J

Length

of Hub

 


K

Number

of

Bolt

Holes

Diameter

of

Bolt

Holes

Bolt

Circle

Diameter


P

Approx.

Weight

Per

Union

(lb)

1/2
3/4
1 5 7/8 2 1 1/2 * 1.315 2 1/16 2 7/8 4 1 4 26
1 1/4 6 1/4 2 1/2 1 1/2 * 1.660 2 1/2 2 7/8 4 1 4 3/8 30
1 1/2 7 2 7/8 1 1/2 * 1.900 2 3/4 3 1/4 4 1 1/8 4 7/8 45
2 8 1/2 3 5/8 1 1/2 * 2.375 4 1/8 4 8 1 6 1/2 65
2 1/2 9 5/8 4 1/8 1 5/8 * 2.875 4 7/8 4 1/8 8 1 1/8 7 1/2 98
3 10 1/2 5 1 7/8 * 3.500 5 1/4 4 5/8 8 1 1/4 8 125
3 1/2
4 12 1/4 6 3/16 2 1/8 * 4.500 6 3/8 4 7/8 8 1 3/8 9 1/2 182
5 14 3/4 7 5/16 2 7/8 * 5.563 7 3/4 6 1/8 8 1 5/8 11 1/2 326
6 15 1/2 8 1/2 3 1/4 * 6.625 9 6 3/4 12 1 1/2 12 1/2 407
8 19 10 5/8 3 5/8 * 8.625 11 1/2 8 3/8 12 1 3/4 15 1/2 675
10 23 12 3/4 4 1/4 * 10.750 14 1/2 10 12 2 19 1099
12 26 1/2 15 4 7/8 * 12.750 17 3/4 11 1/8 16 2 1/8 22 1/2 1706
14 29 1/2 16 1/4 5 1/4 * 14.00 19 1/2 11 3/4 16 2 3/8 25
16 32 1/2 18 1/2 5 3/4 * 16.00 21 3/4 12 1/4 16 2 5/8 27 3/4
18 36 21 6 3/8 * 18.00 23 1/2 12 7/8 16 2 7/8 30 1/2
20 38 3/4 23 7 * 20.00 25 1/4 14 16 3 1/8 32 3/4
22
24 46 27 1/4 8 * 24.00 30 16 16 3 5/8 39

Dimensions Orifice Flanges, WELD NECK, ANSI CLASS 2500, ASME B16.36, RAISED FACE (IN) DATASHEET

  • Dimensions to ASME B16.36 – Orifice Flanges
  • Bolt circle diameters are 1/8 inch larger than bolt diameter.
  • All dimensions except “Thickness of Flange C sizes 1” are the same as a Weld Neck.
  • Approximate weight is based on a orifice flange union which is a set of flanges, plate not included.

data wnf orifice b16.36 400 2500 1data wnf orifice b16.36 400 2500 2data wnf orifice b16.36

Pipe

Size

(NPS)

Outside

Diameterof Flange

A

Diameter

ofRaised Face

B

Thickness

of Flange


C

Diameter

of Bore


D

Diameter

of Hubat Weld

H

Diameter

of Hubat Base

J

Length

of Hub


K

Number

of Bolt Holes

Diameter

ofBolt Holes

Bolt

CircleDiameter

P

Approx.

WeightperUnion

(lb)

1/2
3/4
1 6 1/4 2 1 1/2 * 1.315 2 1/4 3 1/2 4 1 4 1/4
1 1/4 7 1/4 2 1/2 1 1/2 * 1.660 2 7/8 3 3/4 4 1 1/8 5 1/8
1 1/2 8 2 7/8 1 3/4 * 1.900 3 1/8 4 3/8 4 1 1/4 5 3/4
2 9 1/4 3 5/8 2 * 2.375 3 3/4 5 8 1 1/8 6 3/4
2 1/2 10 1/2 4 1/8 2 1/4 * 2.875 4 1/2 5 5/8 8 1 1/4 7 3/4
3 12 5 2 5/8 * 3.500 5 1/4 6 5/8 8 1 3/8 9
3 1/2
4 14 6 3/16 3 * 4.500 6 1/2 7 1/2 8 1 5/8 10 3/4
5 16 1/2 7 5/16 3 5/8 * 5.563 8 9 8 1 7/8 12 3/4
6 19 8 1/2 4 1/4 * 6.625 9 1/4 10 3/4 8 2 1/8 14 1/2
8 21 3/4 10 5/8 5 * 8.625 12 12 1/2 12 2 1/8 17 1/4
10 26 1/2 12 3/4 6 1/2 * 10.750 14 3/4 16 1/2 12 2 5/8 21 1/4
12 30 15 7 1/4 * 12.750 17 3/8 18 1/4 12 2 7/8 24 3/8

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