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ASME B16.36 Orifice Plate Flanges

ASME Orifice Plate Flanges are specialized flanges designed for differential pressure flow measurement systems in industrial pipelines. Compared with standard ASME B16.5 flanges, orifice flanges include pressure tap holes and jack screws for easy installation and maintenance of orifice plates.

These flanges are widely used in oil & gas, petrochemical, LNG, refinery, power generation, and chemical processing industries where accurate flow measurement is required.

Our ASME B16.36 orifice flanges are available in Stainless Steel, Duplex Stainless Steel, Super Duplex, and Nickel Alloy materials including ASTM A182 F304, F316L, F51, F53, Inconel 625, Monel, and Hastelloy.

Available pressure ratings include Class 300, 600, 900, 1500, and 2500 with RF and RTJ facing types.

Product Description

Parameter	Details
Standard	ASME B16.36
Flange Type	Weld Neck / Slip-On / Threaded
Pressure Class	Class 300 / 400 / 600 / 900 / 1500 / 2500
Size Range	NPS 1" – NPS 16" (Weld Neck); NPS 1" – NPS 8" (Slip-On & Threaded)
Pressure Tap	Flange taps - 1" upstream & 1" downstream (standard); Corner taps on request
Tap Connection	Included as standard - one per flange, 180° offset
Face Type	Raised Face (RF) / Flat Face (FF) / Ring Type Joint (RTJ)
Face Finish	125–250 AARH (standard) / 63 AARH on request
Bevel End	Per ASME B16.25
Certificates	MTC EN 10204 3.1 / ISO 9001:2015 / CE / Third-party inspection available
Note	No Class 150 available - ASME B16.36 starts at Class 300
Lead Time	2–4 weeks (standard specs) / 4–6 weeks (special material or large size)

Available Materials for ASME Orifice Plate Flanges

Stainless Steel Orifice Plate Flanges

Available in ASTM A182 F304, F304L, F316, F316L, F321, and F310 materials for general industrial and corrosive service applications.

Duplex & Super Duplex Orifice Plate Flanges

Available in F51, F53, F55, and 2205 materials with higher strength and superior chloride corrosion resistance for offshore and seawater environments.

Nickel Alloy Orifice Plate Flanges

Available in Inconel 625, Monel 400, Hastelloy C276, and other special alloy materials for high-temperature and highly corrosive process conditions.

For full chemical composition → Material Data Sheet

Asme Orifice Plate Seal Surface Types and Treatments

Flat Face (FF)

For connection to cast iron or non-metallic equipment

Raised Face (RF)

Standard for orifice flanges; most common in oil & gas and chemical service

Ring Type Joint (RTJ)

For high-pressure / high-temperature service (Class 900 and above)

Analysis of Flange Sealing Surface Treatment

Face Finish:

125–250 AARH: Standard stock finish for raised face flanges
63 AARH: Smooth finish for cold water and low-pressure service
32 AARH: Available on request for critical sealing applications

Installation Note: When installing orifice flanges, both pressure taps must be at the same elevation. Taps should never be installed facing downward - debris accumulation will block the tap and cause inaccurate readings.

Process Flow

Flange Process Flow

Product Advantages

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Forged, Not Cast

All orifice flanges forged from certified round steel billets - higher density, fewer internal defects, better pressure integrity

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In-House Tap Drilling

Pressure taps and jack screw holes machined on dedicated CNC equipment - tap position and thread quality verified against B16.36 requirements

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PMI Testing

Every heat verified by in-house spectrometer before production and again on finished flanges - eliminates material mix-up risk

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Full Documentation

EN 10204 3.1 MTC, dimensional inspection report, PMI report, and third-party inspection all available

Applications of ASME Orifice Plate Flanges

ASME Orifice Plate Flanges are widely used in:

Oil & Gas Pipelines

LNG Facilities

Refineries

Chemical Processing Plants

Power Generation Systems

Water Treatment Plants

Offshore Platforms

Steam & Process Piping Systems

FAQ

Q: Why is there no Class 150 orifice flange?

A: ASME B16.36 does not provide dimensions for Class 150 orifice flanges. Class 150 flanges are too thin at the base to accommodate the drilling required for pressure taps while maintaining adequate material strength and thread integrity. If your system operates at Class 150 pressure, the standard solution is to specify a Class 300 orifice flange pair - which is dimensionally heavier but fully acceptable from a pressure standpoint.

Q: What is the purpose of jack screws on orifice flanges?

A:Jack screws are threaded studs built into the flange base - one per flange, positioned 180° apart. They allow you to spread the two mated flanges apart for orifice plate removal, inspection, and replacement without cutting or disturbing the pipeline. Before using jack screws, the line must be fully depressurized. Jack screws are not structural members - they do not replace flange bolts.

Q: What is the difference between flange taps and corner taps?

A: Flange taps are the standard configuration under ASME B16.36 - pressure connections located 1 inch upstream and 1 inch downstream from the flange face. Corner taps position the pressure connections directly at the orifice plate face, between the plate and the flange. Corner taps generally provide better accuracy for small-bore pipes and fluids with stable flow profiles. Flange taps are easier to install and maintain and are the default for most industrial applications.

Q: What material should I specify for orifice plate flanges?

A: For general service (water, steam, non-corrosive fluids), carbon steel ASTM A105 is the standard choice. For corrosive or chemical service, specify A182 F316L. For low-temperature service below -29°C, specify A350 LF2. The orifice plate material should match or be compatible with the flange material - 316L is the most common plate material in process plants due to its hardness and corrosion resistance.

Q: Can orifice flanges be supplied with RTJ facing?

A: Yes. RTJ (Ring Type Joint) facing is available for Class 600 and above. RTJ orifice flanges require a matching RTJ ring gasket and are preferred in high-pressure, high-temperature service where a metal-to-metal seal is required. Please specify RTJ when ordering as it affects the flange facing machining and gasket selection.

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