Orifice Flange Assembly

If your flow metering setup lacks tight alignment and certified fittings, measurement errors and rework costs rise fast. Orifice Flange Assembly with tapping holes deliver direct pressure access and strict bore alignment, ensuring accurate DP flow readings.

Standard Specification

ASME B16.36, ISO 5167, AGA Report No. 3

Pressure Rating

Class 300, 600, 900, 1500, 2500 (PN20 to PN420)

Material

Carbon Steel (A105), Stainless Steel (A182 F304/F316), Alloy Steel (A694 F52)

Nominal Size

½” to 24″ (DN15 to DN600) [Most common: 2″-12″ (DN50-DN300)]

Flange Type

Orifice Flange Pair (RF or RTJ) with Jack Screws & Pressure Tappings

Product Description

Loose tolerances and surface inconsistencies affect system integrity and calibration. These assemblies meet ASME B16.36 and ISO 5167, with tapping positions machined for precise transmitter connection.

Facing Type

Raised Face (RF) or Ring-Type Joint (RTJ) [No flat face]

Dimensions

ASME B16.36 Table 2 (Thickness +20% vs standard flanges)

Bolt Circle Diameter

Matches standard ASME B16.5 flanges [±0.06″ tolerance]

Number & Size of Bolt Holes

Standard flange pattern + (2) ½” NPT tapping holes [Radial/angular position per ISO 5167]

Surface Finish

125-250 μin RA (RF), 63-125 μin RA (RTJ) [Bore finish 32-63 μin Ra]

Corrosion Resistance

SS316 common for tappings; Carbon steel often epoxy-lined

Temperature Rating

-20°F to +1000°F (-29°C to +538°C) [Material dependent]

Material Certification

EN 10204 3.1, NACE MR0175 (optional), PED 2014/68/EU

Gasket Compatibility

Orifice Plate Gaskets (SS316 spiral wound + graphite filler)

Coating/Plating

Internal epoxy coating (for carbon steel), Passivation (SS)

Manufacturing Method

Forged (A105/A182) + Precision machining [Bore concentricity ≤0.5% of diameter]

Technical Advantages

Incorrect bore alignment can lead to large DP errors during flow calculation. These orifice flange assembly hold concentricity within 0.5% of diameter. They come with jack screws for quick orifice plate replacement without flange removal.

Surface roughness stays within 32-63 μin Ra, keeping tapping integrity and sealing consistent. Each pair supports full traceability with MTRs, marking, and compliance to EN 10204 3.1 and optional NACE MR0175.

Let's Get Started

Need reliable Flanges for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Industry Applications

Natural Gas Skids

Integrates with flow meters to provide differential pressure data, maintaining custody transfer accuracy.

Power Plant Steam Loops

Monitors steam flow through Class 600 to 2500 flanges, supporting thermal load balancing.

Petrochemical Units

Controls flow in chemical circuits with corrosion-resistant tapping ports and tight bore concentricity.

Offshore Metering Systems

Withstands high salinity and pressure surges, enabling long-term flow tracking in remote rigs.

Water Injection Pipelines

Ensures stable flow measurement using epoxy-coated carbon steel or stainless assemblies under varied pressures.

Orifice Flange Assemblies with Certified Tapping Accuracy

Unverified tapping positions can delay installation and increase calibration time. Our assemblies match radial and angular tapping points per ISO 5167, saving setup time at your site.
They fit ASME B16.5 bolt patterns and maintain standard gasket fit, reducing downtime during integration. Choose from forged carbon steel, stainless steel, or alloy builds for service pressures up to 2500 class.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

Do the tapping holes align with standard DP transmitters without modification?

Yes, the tapping holes follow ISO 5167 spacing and radial angles, which match most standard DP transmitters. This avoids extra fitting work or adapters. Buyers can connect instrumentation without layout changes.

How do you control bore alignment between the flange pair?

We machine each orifice flange pair with concentricity held within 0.5% of bore diameter. This ensures accurate differential pressure across the orifice plate. Poor alignment often skews flow readings, so this tolerance matters.

Can we specify flange material and tapping port material separately?

Yes, you can select different materials for flange bodies and tapping inserts. For example, many choose carbon steel flanges with SS316 tapping ports. This reduces cost while improving corrosion resistance at the connection points.

What support do you provide for orifice plate and gasket matching?

We supply gasket groove dimensions per ASME B16.36 to fit spiral wound gaskets with graphite filler. We also confirm bore matching for customer-supplied orifice plates. This helps avoid seal failures and mismatched installation.

How do you ensure reliable performance under fluctuating pressure conditions?

We use jack screws to secure the orifice flange assembly tightly during installation, preventing movement during pressure shifts. The bolt circle and tapping ports maintain tolerance under load cycles. This gives stable flow readings in varying process conditions.

How does Frigate ensure fast turnaround for bulk orifice flange orders?

In-house forging and precision machining reduce dependency on external vendors

Pre-qualified raw material inventory (A105, A182, A694) shortens lead times

Standardized machining programs for ASME B16.36 dimensions speed up production

Dedicated production lines for high-volume industrial orders

Clear BOM and drawing validation before production avoids delays and rework

Can Frigate support project-based customization for EPC contractors?

Custom tapping configurations based on project instrumentation layouts

Flexibility in pressure class, facing type (RF/RTJ), and material combinations

Engineering support for datasheet alignment with ISO 5167 and AGA standards

Batch-wise production with consistent tolerances for large projects

Documentation packages aligned with EPC and end-user approval workflows

What quality checks does Frigate perform before dispatch?

Bore concentricity inspection within ≤0.5% tolerance

Hydrostatic and dimensional checks as per ASME standards

Surface finish verification for sealing faces and tapping areas

PMI (Positive Material Identification) for alloy and stainless grades

Full traceability with MTRs and EN 10204 3.1 certification

How does Frigate reduce installation challenges at site?

Pre-machined tapping holes aligned with ISO 5167 standards

Bolt circle compatibility with ASME B16.5 ensures direct fitment

Jack screws included for easy orifice plate handling during installation

Clean flange face finishing reduces gasket misalignment issues

Marking and tagging simplify orientation and assembly at site

Why choose Frigate as your orifice flange assembly manufacturer?

End-to-end manufacturing control—from forging to final machining

Proven experience in high-pressure and critical flow measurement systems

Consistent adherence to global standards (ASME, ISO, AGA)

Ability to deliver both standard and fully customized assemblies

Strong documentation practices that support clean procurement and inspection

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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

Other Locations

GENERAL ENQUIRIES

LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Components Built for Critical Performance

Engineered Products for Critical Applications

Orifice Flange Assembly

Standard Specification

Pressure Rating

Material

Nominal Size

Flange Type

Product Description

Facing Type

Dimensions

Bolt Circle Diameter

Number & Size of Bolt Holes

Surface Finish

Corrosion Resistance

Temperature Rating

Material Certification

Gasket Compatibility

Coating/Plating

Manufacturing Method

Technical Advantages

Let's Get Started

Industry Applications

Orifice Flange Assemblies with Certified Tapping Accuracy

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Having Doubts? Our FAQ

Get Clarity with Our Manufacturing Insights

We'd love to Manufacture for you!

LOCATIONS

Registered Office

Operations Office

Other Locations

GENERAL ENQUIRIES

LOCATIONS

Registered Office

Other Locations

GENERAL ENQUIRIES

Get Your Quote Now

Orifice Flange Assembly

Get Latest Price

Orifice Flange Assembly

Get Latest Price