PLSteel Pipe FlangesPlate Flange (PL)
Flat-type flange with simple structure, light weight and low cost — ideal for low-pressure pipeline systems.
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Orifice Flange (OF)
Paired flanges with pressure taps for flow measurement — holds orifice plate per ASME B16.36.
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OFSteel Pipe Flanges
Overview
An orifice flange is a specialized pipe flange designed exclusively for flow measurement in industrial piping systems. Installed in pairs, it clamps an orifice plate between them. Built-in pressure taps connect to a differential pressure transmitter for accurate flow rate calculation per Bernoulli's principle.
Size Range
1" – 24"
Pressure Class
Class 300 – 2500
Key Features
- Radial pressure tap holes (typically ½" NPT)
- Jacking screws for easy plate removal
- Supplied in matched pairs per ASME B16.36
- Weld neck, slip-on and threaded types
- Corner, flange and pipe tap configurations
Benefits
- Integrated flow measurement without separate fittings
- Standardized tap locations for DP transmitters
- Easy orifice plate inspection and replacement
Specifications
| Standard | ASME B16.36 |
| Pressure Ratings | Class 300 – 2500 |
| Nominal Diameter | DN25 – DN600 (NPS 1" – 24") |
| Tap Size | ½" NPT typical |
| Types | Weld Neck, Slip-On, Threaded |
Applications
Custody transfer meteringOil and gas production flow monitoringRefinery and chemical plant instrumentationPower station steam flow measurement
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Standards
- • ASME B16.36
- • ASME B16.5
- • API 14.3
Materials
- • Carbon Steel: A105, 20#, Q235B, A234 WPB
- • Stainless Steel: 304, 304L, 316, 316L, 321
- • Alloy Steel: 16Mn, F11, F22, 15CrMo
- • Duplex & Super Duplex: F51, F53, 2205
- • Special alloys: Monel, Hastelloy, Titanium (on request)
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