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A carbon steel orifice flange is not just a flange cut from carbon steel, it is a matched pair of flanges machined with radial tapped holes on the flange faces so that pressure sensing lines can be connected on either side of an orifice plate clamped between them, built to ASME B16.36 in ASTM A105 and A694 grades for Class 150 through 2500 duty. The tapped holes let a differential pressure transmitter read the pressure drop across the orifice plate, and that pressure drop is what gets converted into a flow rate reading. Jack screws fitted between the two flanges let a technician spread them apart just enough to slide the orifice plate out for inspection or cleaning, without breaking the pipeline joint or shutting the whole line down. Solitaire Overseas manufactures and supplies carbon steel orifice flanges with full mill test certification, and hydrostatic testing or third party inspection can be arranged on request.
| Parameter | Specification |
|---|---|
|
Standard |
ASTM A105, ASTM A694, ASME B16.36, ASME B16.5 |
|
Size Range |
NPS 1/2 inch to 24 inch |
|
Pressure Class |
Class 150, 300, 600, 900, 1500, 2500 |
|
Facing |
Raised Face or Ring Type Joint |
|
Configuration |
Paddle type or universal type, supplied as a matched pair with jack screws |
|
Testing |
Hydrostatic test, third party inspection on request |
|
Certification |
Mill Test Certificate EN 10204 3.1, 3.2 on request |
| Grade | C max | Mn | P max | S max | Si |
|---|---|---|---|---|---|
|
A105 |
0.35 |
0.60 to 1.05 |
0.035 |
0.040 |
0.10 to 0.35 |
| Grade | Tensile Strength min | Yield Strength min | Elongation min (%) |
|---|---|---|---|
|
A105 |
485 MPa (70 ksi) |
250 MPa (36 ksi) |
22 |
|
A694 F60 |
586 MPa (85 ksi) |
415 MPa (60 ksi) |
18 |
| Class | Approximate Rating at Ambient (psi) | Approximate Rating at Ambient (bar) |
|---|---|---|
|
150 |
285 |
20 |
|
300 |
740 |
51 |
|
600 |
1480 |
102 |
|
900 |
2220 |
153 |
|
1500 |
3705 |
255 |
|
2500 |
6170 |
425 |
For Class 600 and above, see our Carbon Steel High Pressure Flanges range for the full grade selection guidance at that duty.
| Grade | Typical Use | Related Product Page |
|---|---|---|
|
ASTM A105 |
Standard grade for Class 150 through 2500 metering duty |
|
|
ASTM A694 |
High yield grade for elevated pressure gas or oil metering runs |
|
|
ASTM A350 LF2 |
Low temperature metering service |
Tap position affects pressure measurement accuracy. ASME B16.36 specifies tap locations so transmitters provide readings consistent with the flow calculation.
Paddle type suits fixed flow conditions and is more economical. Universal type suits variable flow where different orifice plates may be used.
Usually not. A105 suits most Class 150 to 600 metering applications. A694 is useful for higher pressure duties requiring greater strength.
Follow your metering engineer or applicable custody transfer standard. Jack screws allow plate removal without cutting the pipeline.
Yes. A350 LF2 is available for low temperature applications. The configuration remains the same, while material and impact testing requirements change.
Contact Solitaire Overseas for expert guidance and the right flange solution for your project.
Related ranges:Carbon Steel Flanges,Carbon Steel Pipe Flanges,Carbon Steel High Pressure Flanges, andCarbon Steel Plate Flanges.