Orifice Flange Suppliers

Orifice flanges are a crucial part of fluid control systems across various industries that require accurate, reliable, and cost-effective flow measurement. Their precision, ease of integration with instruments, and compliance with international standards make them a preferred choice in:

1. Oil & Gas and Petrochemical:

   Used extensively in upstream, midstream, and downstream segments, orifice flanges help measure crude oil, natural gas, and refined product flows. They are ideal for custody transfer stations, where precise metering is critical for financial accounting.

2. Power Plants:

   In thermal and hydro power plants, orifice flanges are used to measure steam, feedwater, and cooling fluid flow to optimize system efficiency and ensure safe operation.

3. Water Treatment & Desalination:

   Municipal and industrial water treatment facilities use orifice flanges to monitor chemical dosing, wastewater discharge, and clean water distribution, ensuring proper regulation and environmental compliance.

4. Chemical & Fertilizer Plants:

   Their robust material compatibility (Stainless Steel, Alloy Steel, Duplex, Monel, Inconel, etc.) makes them suitable for corrosive media and harsh environments, ensuring accurate process control and safety.

5. Marine & Offshore Applications:

   Orifice flanges are used to monitor fuel and ballast water systems on ships and offshore platforms, where space-saving and rugged designs are essential.

Their standardized design as per ASME B16.36 and compatibility with a wide range of differential pressure instruments makes them an industry-standard flow metering solution across these demanding sectors.

Yes, orifice flanges can be customized depending on the type of fluid (liquid, gas, or steam), flow characteristics, pressure conditions, and specific industry standards.

Customization Options Include:

• Orifice Plate Type: Concentric (for clean fluids), Eccentric (for slurry or gas with condensate), or Segmental (for dirty or viscous fluids).
• Tap Configuration: Flange taps, corner taps, or D-D/vena contracta taps — based on accuracy and system design.
• Material Compatibility: Stainless steel for corrosion resistance, alloy steel for high pressure/temperature, or duplex/super duplex for offshore and aggressive fluids.
• Compliance Needs: Plates and flanges can be manufactured as per ISA, AGA, API, or ISO standards, depending on end-user or country requirements.

Industry Examples:

• In refineries, orifice flanges may be customized to withstand high temperatures and hydrocarbon media.
• In water treatment, the focus is often on corrosion resistance and low pressure drop.
• For steam lines, plates are designed to resist erosion and ensure stable flow readings.

Orifice flanges are engineered to ensure accurate flow rate calculations by incorporating precise pressure tap holes and standardized orifice plates. Their popularity stems from their cost-effectiveness and ease of integration in high-pressure pipelines.

Orifice flanges remain a top choice due to their simplicity, compliance with global standards, and reliable differential pressure readings.

Orifice flanges are governed by several international standards that ensure their dimensional accuracy, pressure-handling capability, and compatibility with orifice plates and flow meters.

Key standards include:

• ASME B16.36 – Specifically defines dimensions and requirements for orifice flanges.
• ASME B16.5 / B16.47 – Governs general flange dimensions and pressure ratings.
• API 598 / API 6A – Used for pressure testing and inspection procedures.
• MSS-SP-44 – Often applicable to large-diameter flanges.
• EN 1092-1 – European standard for steel flanges, sometimes used for global exports.
• NACE MR0175 / ISO 15156 – Required for sour service applications (H₂S environments).

At Nutech Overseas, each orifice flange undergoes PMI testing, dimensional checks, and NDT (as required) to ensure compliance with applicable standards and client specifications.

Did You Know?
The pressure tapping location and the flange face type (RF/RTJ) must also conform to flow measurement design codes such as AGA/API/ISO for precise integration.

Orifice flanges are available in several variations, each designed for specific flow measurement setups and process requirements. The main types include:

Weld Neck Orifice Flanges

• Feature a long tapered hub.
• Ideal for high-pressure and high-temperature applications.
• Commonly used with precise flow meters in critical systems.

Slip-On Orifice Flanges

• Easier to install and align.
• Suitable for low to moderate pressure applications.
• Cost-effective for less critical flow measurement systems.

Threaded Orifice Flanges

• Used in low-pressure, non-welded systems.
• Common in small diameter pipelines with threading compatibility.

RTJ Orifice Flanges

• Feature a Ring Type Joint groove.
• Designed for high-pressure sealing using metal ring gaskets.
• Ideal for offshore and petrochemical applications.

Raised Face (RF) Orifice Flanges

• Most common type for general-purpose applications.
• Supports both gasketed sealing and orifice plate alignment.

Each type of orifice flange includes precisely machined orifice plate housing, pressure tap holes, and often comes with jack screws for easy flange separation during maintenance.

Orifice flanges are widely exported to key global markets, especially in regions known for oil & gas and flow measurement systems. These include:

• United States – Frequently shipped to industries across Texas, Louisiana, and California for pipeline metering and pressure monitoring systems.
• Europe – Supplied to Germany, Italy, Spain, and the Netherlands for applications in chemical plants, power generation, and industrial flow regulation setups.
• Middle East – Exported in large volumes to the UAE, Saudi Arabia, Oman, and Qatar, where they're used in refineries, petrochemical plants, and offshore platforms.

These flanges are manufactured as per ASME B16.36, with strict dimensional accuracy, pressure class compatibility, and customized bore holes for precise orifice plate fitting. Global clients prefer them for their accurate flow control, reliable sealing, and compatibility with differential pressure transmitters.