Orifice Flange

What is Orifice Flange

An Orifice Flange is a special flange used to install an orifice plate in a pipeline for flow measurement. The orifice plate creates a pressure difference between the upstream and downstream sides, and the pressure taps on the flange allow instruments to measure this differential pressure.

Compared with standard pipe flanges, orifice flanges include machined pressure tap holes and usually use jack screws to help separate the flange pair during inspection or replacement of the orifice plate.

Orifice flanges are commonly supplied as a pair and used with gaskets, bolts, nuts, orifice plates, and flow measurement instruments.

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Orifice Flange Specifications

Additional Specifications:

• Face Types: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
• Flange Types: Weld neck, slip on, threaded, customized type
• Accessories: Orifice plate, jack screws, bolts, nuts, gaskets
• Pressure Tap: Standard tap holes or customized tapping
• Custom Service: Special bore size, special tap position, special material available

Orifice Flange Materials & Grades

Orifice flanges are available in different materials according to working medium, pressure, temperature, corrosion environment, and project standard.

Carbon steel orifice flanges are commonly used in oil, gas, steam, and general industrial pipelines. Stainless steel orifice flanges are suitable for chemical, food, pharmaceutical, and corrosive media. Alloy steel materials are suitable for high-temperature and high-pressure systems.

Orifice Flange Dimensions

Orifice Flange Dimension Drawing

Orifice flanges can be manufactured according to standard dimensions or customer drawings. Key dimensions include outside diameter, bore size, flange thickness, bolt circle diameter, bolt hole diameter, pressure tap position, jack screw hole, and sealing face type.

Advantages of Orifice Flange

Accurate Flow Measurement

Orifice flanges are designed for differential pressure flow measurement and provide reliable connection for orifice plate systems.

Integrated Pressure Taps

Machined pressure tapping holes allow easy connection with flow meters and differential pressure instruments.

Easy Inspection and Maintenance

Jack screws help separate the flange pair, making it easier to inspect, clean, or replace the orifice plate.

Multiple Type Options

Weld neck, slip on, threaded, RF, FF, and RTJ types can be supplied according to different pipeline requirements.

Reliable Sealing Performance

Accurate machining and proper gasket sealing help reduce leakage risk in flow measurement systems.

Custom Manufacturing Available

Bore size, tap position, material, face type, pressure rating, and accessories can be customized according to project drawings.

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Applications

Oil and Gas Industry

Used for flow measurement in crude oil pipelines, natural gas pipelines, refinery systems, and offshore platforms.

Petrochemical Plants

Suitable for process pipeline flow monitoring and control in petrochemical production systems.

Power Generation

Used in steam pipelines, boiler systems, cooling water lines, and auxiliary flow measurement systems.

Chemical Processing

Stainless steel and alloy orifice flanges are suitable for corrosive chemical media and process control pipelines.

Refinery Systems

Applied in fuel, gas, steam, and process fluid measurement systems.

Industrial Process Control

Used with orifice plates and differential pressure transmitters for liquid, gas, and steam flow measurement.

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Why Choose Us

Comprehensive Manufacturing Capability

We coordinate forging, heat treatment, machining, drilling, tapping, inspection, coating, and packaging under one production system.

Accurate Pressure Tap Machining

We control pressure tap position, bore accuracy, sealing face finish, and bolt hole alignment to support stable flow measurement performance.

International Standards Compliance

Our products meet ASME B16.36, ASME B16.5, EN, DIN, JIS, and customer drawing requirements.

Complete Accessory Support

Orifice plates, jack screws, bolts, nuts, gaskets, and customized accessories can be supplied according to project requirements.

Wide Material Options

Carbon steel, stainless steel, alloy steel, duplex steel, nickel alloy, copper alloy, and titanium materials are available.

Strict Quality Inspection

Each batch is inspected for material grade, dimensions, pressure tap accuracy, thread quality, sealing surface, and appearance.

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FAQ

Q: What is an Orifice Flange?

A: An orifice flange is a special flange used with an orifice plate for flow measurement in pipeline systems.

Q: What standard is commonly used for Orifice Flange?

A: ASME B16.36 is the common standard for orifice flanges. ASME B16.5 and custom drawings can also be used for customized requirements.

Q: What is the function of pressure taps?

A: Pressure taps allow instruments to measure the pressure difference before and after the orifice plate, which is used to calculate flow rate.

Q: Why do Orifice Flanges use jack screws?

A: Jack screws help separate the flange pair during maintenance, making it easier to remove or replace the orifice plate.

Q: Can you supply Orifice Flange with accessories?

A: Yes. Orifice plates, jack screws, bolts, nuts, gaskets, and customized accessories can be supplied together.

Contact Us

Ready to enhance your piping systems with premium Weld Neck Flange solutions? Contact kevin.zhao@hkflange.com for technical specifications and competitive quotations today.

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