ANSI B16.36 Orifice Flange Dimensions

Orifice flange for run installation should be so constructed, machined and attached to the that the inner surface of the passage extends through the orifice flange so that there is no recess at the orifice plate.
Orifice flanges are used instead of the standard pipe flanges when orifice plate or flow nozzle is used. The basic purpose for this is to measuring the flow rate of either gases or liquids in the respective pipeline.
These flanges are used in various industrial applications and are available in various sizes and materials.

China Orifice Flange Manufacturer www.steeljrv.com supplies orifice flanges in forged steel, Stainless Steel, alloy steel, etc.

Material of orifice flange:

  • Carbon steel: ASTM A105,ASTM A105N,GB 20,C22.8.
  • Alloy steel: ASTM/ASME A182 F1-F12-F11-F22- F5-F9- F91
  • Stainless steel: ASTM/ASME A182 F304-304L-304H-304LN-304N
  • ASTM/ASME A182 F316-316L-316H-316LN-316N-316Ti
  • ASTM/ASME A182 F321-321H, F347-347H
  • Low temperature steel: ASTM/ASME A350 LF2.
  • High performance steel: ASTM/ASME A694 F42 , F52, F56, F60, F65, F70

Standards of orifice flange:

ASME B16.36 – Orifice Flanges

  • Slip-on Flange: Class 300, Class 400, Class 600, Class 900, Class 1500
  • Threaded Flange: Class 300, Class 400, Class 600, Class 900, Class 1500
  • Weld Neck Flange: Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500

Orifice Flange Dimensions

data orifice union flange - ANSI B16.36 Orifice Flange Dimensions

Note: Orifice Flanges are not available above ANSI Class 300

ANSI B16.36 Orifice Flange RF Class 300 (in)

  • 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.

20190813230558 73718 - ANSI B16.36 Orifice Flange Dimensions

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

NBH

Diameter

of Bolt

Holes

DBH

Bolt

Circle

Diameter


P

Approx.

Weight

Per

Union

(lb) AW

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 12.00 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

ANSI B16.36 Orifice Flange RF Class 400 (in)

20190813230812 35349 - ANSI B16.36 Orifice Flange Dimensions

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

NBH

Diameter

of Bolt

Holes

DBH

Bolt

Circle

Diameter


P

Approx.

Weight

Per

Union

(lb) AW

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

ANSI B16.36 Orifice Flange RF Class 600 (in)

20190813230920 66186 - ANSI B16.36 Orifice Flange Dimensions

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

NBH

Diameter

of Bolt

Holes

DBH

Bolt

Circle

Diameter


P

Approx.

Weight

Per

Union

(lb) AW

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

ANSI B16.36 Orifice Flange RF Class 900 (in)

20190813230920 66186 - ANSI B16.36 Orifice Flange Dimensions

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

NBH

Diameter

of Bolt

Holes

DBH

Bolt

Circle

Diameter


P

Approx.

Weight

Per

Union

(lb) AW

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

ANSI B16.36 Orifice Flange RF Class 1500 (in)

20190813230920 66186 - ANSI B16.36 Orifice Flange Dimensions

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

NBH

Diameter

of Bolt

Holes

DBH

Bolt

Circle

Diameter


P

Approx.

Weight

Per

Union

(lb) AW

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

ANSI B16.36 Orifice Flange RF Class 2500 (in)

20190813230920 66186 - ANSI B16.36 Orifice Flange Dimensions

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

NBH

Diameter

of Bolt

Holes

DBH

Bolt

Circle Diameter

P

Approx.

Weight

per

Union

(lb) AW

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

Drawing of Orifice Flanges

Orifice Flanges generally come with either Raised Faces or RTJ (Ring Type Joint) facings. They are, for all intensive purposes, the same as weld neck and slip on flanges with extra machining.

Drawing of Orifice Flanges - ANSI B16.36 Orifice Flange Dimensions

Orifice flange for run installation should be so constructed, machined and attached to the that the inner surface of the passage extends through the orifice flange so that there is no recess at the orifice plate.

The flange bore and the section of pipe shall be of the same internal diameter.

Weldneck and Slip-On Orifice Runs

Weldneck and Slip On Orifice Runs - ANSI B16.36 Orifice Flange Dimensions

Weld Neck Orifice Run

Weld Neck Orifice Run - ANSI B16.36 Orifice Flange Dimensions

Slip-on Orifice Run

1. End of pipe should be reamed after cutting to ensure a perfectly smooth bore and should enter the flange as shown, for raised face flanges. For ring type joints the ends of the pipe should be a maximum of 3 mm from flange face.

2. The pipe should be drilled through each flange pressure tapping using a 12 mm drill for 4” bore pipe and over, a 10 mm drill for 3” bore pipe and a 6 mm drill for 2½” bore pipe and smaller.

Orifice flange union

Two Orifice Flanges are called an orifice flange union. Each flange comes with two pipe taps for measuring the pressure drop of the flow through an orifice plate.. Orifice plates do not come with the flanges and are sized based on the requirements of the process. Two jack screws are used to spread the flanges apart in order to change the orifice plate. This flange is normally available in weld neck, slip-on, and threaded flanges.

Orifice Flange 1 - ANSI B16.36 Orifice Flange Dimensions

These flanges have a raised face.

Orifice Flange 2 - ANSI B16.36 Orifice Flange Dimensions

Orifice Flanges are installed in a straight run of pipe in order to avoid turbulence at the plate. As a rule of thumb, an orifice flange has ten diameters of straight pipe upstream and five diameters of pipe downstream.

An Orifice Flange

An Orifice Flange is intended for use instead of standard pipe flanges when an orifice plate or flow nozzle must be installed. Pairs of pressure tapings are machined into the Orifice Flange, making separate orifice carriers or tapings in the pipe wall unnecessary. This type of flange includes the orifice plate with data tap, a pair of flanges with integrated taps, a set of gaskets, bolts and nuts and a jackscrew to assist separating the flanges for orifice inspection.
Design can be with RF or RTJ weld neck flanges or RF slip-on flanges. The orifice plates are centered within very close tolerances of the standards.
An Orifice plate is a device used for measuring flow rate. Either a volumetric or mass flow rate may be determined, depending on the calculation associated with the orifice plate. It uses the Bernoulli’s principle which states that there is a relationship between the pressure of the fluid and the velocity of the fluid. When the velocity increases, the pressure decreases and vice versa.
An Orifice plate is a thin plate with a hole in the middle. It is usually placed in a pipe in which fluid flows. When the fluid reaches the orifice plate, the fluid is forced to converge to go through the small hole; the point of maximum convergence actually occurs shortly downstream of the physical orifice, at the so-called vena contracta point As it does so, the velocity and the pressure changes. Beyond the vena contracta, the fluid expands and the velocity and pressure change once again. By measuring the difference in fluid pressure between the normal pipe section and at the vena contracta, the volumetric and mass flow rates can be obtained from Bernoulli’s equation.
When installing the orifice plate flange the pressure taps need to be at the same elevation to each other. The assumption when making the calculation for the orifice plate is that static head of the tubes is the same on both sides of the orifice plate. Pressure taps should not be installed facing down as the taps could become plugged with debris in the line.
Weld Neck Orifice Flanges are butt-welded into the pipeline. The inside diameter (bore diameter) of the pipe should be specified when ordering. Weldneck orifice flanges are available in ANSI classes 300, 600, 900, 1500 and 2500. They are not available in ANSI 150 sizes because the thickness of ANSI 150 flanges are not enough to allow for drilling pressure taps.

Installing the orifice plate flange

Orifice flanges are installed in a straight run of pipe in order to avoid turbulence at the plate. As a rule of thumb, an orifice flange has ten diameters of straight pipe upstream and five diameters of pipe downstream.

Orifice Flange Union - ANSI B16.36 Orifice Flange Dimensions

Orifice Flange Union

Pipe Tap - ANSI B16.36 Orifice Flange Dimensions

Pipe Tap

Jack Screw - ANSI B16.36 Orifice Flange Dimensions

Jack Screw

Pipe Taps - ANSI B16.36 Orifice Flange Dimensions

Pipe Taps

When installing the orifice plate flange the pressure taps need to be at the same elevation to each other. The assumption when making the calculation for the orifice plate is that static head of the tubes is the same on both sides of the orifice plate. Pressure taps should not be installed facing down as the taps could become plugged with debris in the line.

Weldneck orifice flanges are butt-welded into the pipeline. The inside diameter (bore diameter) of the pipe should be specified when ordering. Weldneck orifice flanges are available in ANSI classes 300, 600, 900, 1500 and 2500. They are not available in ANSI 150 sizes because the thickness of ANSI 150 flanges are not enough to allow for drilling pressure taps.

orifice flange1 - ANSI B16.36 Orifice Flange Dimensions orifice flange2 - ANSI B16.36 Orifice Flange Dimensions orifice flange3 - ANSI B16.36 Orifice Flange Dimensions

Summary
ans b16 36 orifice flange dimensions - ANSI B16.36 Orifice Flange Dimensions
Article Name
ANSI B16.36 Orifice Flange Dimensions
Description
Orifice flange for run installation should be so constructed, machined and attached to the that the inner surface of the passage extends through the orifice flange so that there is no recess at the orifice plate. Orifice flanges are used instead of the standard pipe flanges when orifice plate or flow nozzle is used. The basic purpose for this is to measuring the flow rate of either gases or liquids in the respective pipeline.
Author
Publisher Name
www.steeljrv.com
Publisher Logo

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