ASME B16.36 Flange Standard

Dimensions, Classes, Tapped Holes, Pressure Ratings

ASME B16.36 Flange Standard

ASME B16.36 Standard Flanges: Dimensions | Specifications | Material Grade | Standards | About ANSI B16.36 | All Product Types

The ASME B16.36 flange standard defines the dimensional and pressure requirements for flanges used with orifice meters, specifically those with tapped holes for pressure measurement. This standard complements ASME B16.5 and is applicable to steel pipe flanges from NPS 1″ to NPS 24″ (DN25 to DN600) in pressure classes 300, 400, 600, and 900.

Unlike regular flanges, B16.36 flanges are designed with precisely located radial tapped holes to accommodate orifice plates and pressure taps, enabling accurate differential pressure measurement in flow systems. The standard covers both Raised Face (RF) and Ring Type Joint (RTJ) facings, along with details on jack screw holes, drilling templates, gasket seating surfaces, and dimensional tolerances.

At Nutech, we supply ASME B16.36 flanges manufactured to strict quality standards, ensuring compatibility with global projects across oil & gas, chemical, refining, power generation, and water treatment sectors. Whether it's a carbon steel tapped flange, a stainless steel pressure-rated flange, or a custom-machined B16.36 face, our components are tested for dimensional accuracy and pressure integrity as per industry norms.

We offer full documentation support including EN 10204 3.1/3.2, NACE compliance, and IBR (where applicable), with exports to countries like UAE, Saudi Arabia, Qatar, Germany, South Africa, Singapore, and the USA.

Complete Technical Scope of ASME B16.36 Flanges – Dimensions, Pressure Classes, Face Types & Tapped Hole Configuration

For complete technical details, including dimensions, pressure rating classes, weight charts, sizes, tolerances, and material specifications of our ANSI B16.36 Standard Flanges, please download the full Catalog PDF below.

Drilling Dimensions, Tapped Pressure Connections, Jack Screw Location & Gasket Seating Guidelines as per ASME B16.36

Technical Specifications of ASME / ANSI B16.36

Specification Details
Standard ASME B16.36 – Orifice Flanges with Tapped Holes for Pressure Measurement
Size Range 1″ NB to 24″ NB (DN25 to DN600)
Pressure Ratings Class 300, 400, 600, and 900
Face Types Raised Face (RF), Ring Type Joint (RTJ)
Tapped Hole Position Precisely machined radial tapped holes located 90° apart for differential pressure connections
Jack Screw Holes Provided for easy separation of flange connection during maintenance or inspection
Drilling Template Matches ASME B16.5 bolt-hole patterns for equivalent pressure class
Gasket Compatibility Spiral Wound, Metal Jacketed, RTJ Gaskets as per ASME B16.20
Surface Finish Stock Finish, Smooth, Spiral Serrated as per ASME B16.5 guidelines
Compliance Meets ASME B16.36 dimensional tolerances and testing requirements
Testing & Inspection Hydro Test, PMI, Dimensional Inspection, Visual QC (as required)
Documentation EN 10204 3.1 / 3.2, NACE MR0175, ISO 9001, PED 2014/68/EU
Application Industries Oil & Gas, Petrochemical, Power Generation, Water Treatment, Food & Beverage, Fire Protection Systems, Pulp & Paper, Shipbuilding, HVAC, Offshore
Origin Made in India (by Nutech Overseas)
Export Network USA, Europe, and Middle East

Complete Material Grade Chart - Class 150 ANSI B16.36

Material Category B16.36 Flange Grades
Stainless Steel B16.36 Flange ASTM A182 F304 / F304L / F304H, F316 / F316L / F316Ti, F310, F309S, F317 / F317L, F321 / F321H, F347 / F347H, F904L, ASTM A351 CF3 / CF3M / CF8 / CF8M / CF8C, DIN 1.4301, 1.4306, 1.4307, 1.4311, 1.4401, 1.4404, 1.4408, 1.4409, 1.4541, 1.4571, 1.4550, 1.4435, 1.4539
Duplex Steel B16.36 Flange ASTM A182 F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61, UNS S31803 / S32205
Super Duplex Steel B16.36 Flange ASTM A182 F53 / F55 / F57 / F59 / F60 / F61, UNS S32750 / S32760
Carbon Steel B16.36 Flange ASTM A105 / A105N, ASTM A350 LF2, ASTM A694 F52 / F56 / F60 / F65 / F70 / F80, ASTM A216 WCB, DIN 1.0460 / 1.0402 / 1.0619, Die Steel, Mild Steel
Alloy Steel B16.36 Flange ASTM A182 F5 / F9 / F11 / F12 / F22 / F91, AISI 4130 / 4140
Nickel Alloy B16.36 Flange Nickel 200 / 201, ASTM B564
Monel B16.36 Flange Monel 400 (UNS N04400), Monel K500 (UNS N05500), ASTM B564
Inconel B16.36 Flange Inconel 600 / 601 / 625 / 690 / 718 / 783 / X750, ASTM B564
Incoloy B16.36 Flange Incoloy 800 / 800H / 800HT (UNS N08800), Incoloy 825 (UNS N08825), Incoloy 925, ASTM B564
Hastelloy B16.36 Flange Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X, ASTM B564
Alloy 20 B16.36 Flange Alloy 20 / 20Cb-3, Carpenter® 20, ASTM B462
254 SMO B16.36 Flange SMO 254 / 6Mo, UNS S31254, DIN 1.4547, ASTM A182
Copper Nickel B16.36 Flange Copper Nickel 90/10 (C70600), 70/30 (C71500), UNS C71640, ASTM B61 / B62 / B151 / B152
Copper B16.36 Flange TP1, TP2, T1, T2, C10100–C12300, C14200–C17200, C21000–C71520, including C10930, C11000, C11400, C12000, C12200, C26000, C28000, C33000, C44300, C70600, etc.
Brass B16.36 Flange Grades 3602, 2604, H59, H62, etc.
Aluminium B16.36 Flange Aluminium Grades 5052, 6061, 6063, 2017, 7075, etc.
Titanium B16.36 Flange ASTM B381 Gr.1 / Gr.2 / Gr.4 / Gr.5 / Gr.7, UNS R50250 / R50400 / R50550 / R50700 / R52400 / R53400 / R56320 / R56400
Other Special Grades Al6XN, Tin Bronze, Aluminium Bronze, Lead Bronze, Nimonic 75 / 80A / 90

International Flange Standards We Manufacture & Supply

What is ASME B16.36 and how is it different from ASME B16.5?

ASME B16.36 is a dimensional standard specifically for flanges that include tapped holes used in orifice measurement assemblies. These tapped holes allow pressure taps to be connected for measuring differential pressure across an orifice plate.

Here’s how it differs from ASME B16.5:

  • B16.36 covers flanges with radial tapped holes and jack screw holes.
  • It includes design dimensions and tolerances specifically for orifice flanges.
  • B16.5 covers general-purpose flanges without tapped holes and does not specify jack screw or pressure tap configurations.
  • The bolt hole drilling patterns in B16.36 are identical to B16.5 for interchangeability, but the purpose and design are application-specific.

Use ASME B16.36 flanges where accurate flow measurement and instrumentation taps are required — common in oil & gas, petrochemical, and process industries.

What are jack screw holes in ASME B16.36 flanges and why are they important?

Jack screw holes in ASME B16.36 flanges are small threaded holes machined into the flange body, typically located opposite the pressure tap locations. These are not for bolting but for the insertion of jack screws used to separate the flange faces during maintenance.

Key functions of jack screw holes:

  1. Allow safe and easy disassembly of the flange joint without damaging the orifice plate or gasket.
  2. Provide even pressure release, especially in high-pressure systems.
  3. Prevent binding or distortion of bolts during flange separation.

These features are essential in industries where routine inspection or replacement of orifice plates is required, such as in refineries, power plants, and chemical processing units.

Jack screw hole locations and dimensions are standardized under ASME B16.36 and vary by flange size and pressure class.

Are ASME B16.36 flanges compatible with standard gaskets and orifice plates?

Yes, ASME B16.36 flanges are fully compatible with standard orifice plates and gasket types commonly used in flow measurement systems. The standard defines the gasket seating surfaces and gasket dimensions required for reliable sealing and accurate differential pressure readings.

Gasket Compatibility:

  • Spiral wound gaskets (most common in RF flanges)
  • Metal jacketed gaskets
  • RTJ ring gaskets (for RTJ face flanges)

Orifice Plate Compatibility:

  • Plates are designed to fit between the flange facings with the pressure taps aligned perfectly with the orifice bore.
  • B16.36 ensures that orifice plate centering and alignment meet flow measurement accuracy standards.

For best results, always match the gasket material and plate thickness with the process media, pressure class, and flange face type (RF or RTJ).

How are tapped holes positioned in ASME B16.36 flanges for differential pressure measurement?

In ASME B16.36 flanges, tapped holes are precision-machined to allow the installation of pressure taps used in differential pressure flow metering systems. These holes are strategically located to ensure accurate and consistent flow readings.

Key Tapped Hole Positioning Features:

  1. Typically located at 180° apart, on the flange's outside diameter, across the orifice bore centerline.
  2. Some applications may require 90° orientation, depending on system layout and pressure tapping method.
  3. Each tapped hole is designed for NPT or BSP threading based on project specification.
  4. The tapped hole depth, diameter, and threading standard must comply strictly with ASME B16.36 dimensions for proper instrumentation fit.

Accurate positioning of tapped holes is critical to ensure precise differential pressure measurement, avoid turbulence, and maintain flow profile integrity across the orifice plate.

What are the installation guidelines for ASME B16.36 orifice flanges in flow metering systems?

Proper installation of ASME B16.36 flanges is essential for achieving accurate flow measurement and maintaining system integrity. These flanges are typically installed in pairs with an orifice plate centered between them and pressure taps aligned correctly.

Installation Guidelines Include:

  • Ensure flange faces are aligned with minimal pipe misalignment.
  • The orifice plate should be installed with the beveled side facing downstream (for concentric plates).
  • Pressure tap holes must be positioned at correct clock angles (e.g., 3 & 9 o'clock for horizontal runs).
  • Use the recommended gasket type and thickness per the flange face (RF or RTJ).
  • Tighten bolts in a criss-cross sequence to ensure uniform gasket compression.
  • Install jack screws (if applicable) to assist in disassembly without damaging components.

Following these steps helps ensure measurement accuracy, prevents leakage, and reduces maintenance frequency.

Can ASME B16.36 flanges be customized with additional accessories or special coatings for harsh environments?

Yes, ASME B16.36 flanges can be customized with additional features and protective coatings to suit demanding industrial environments, particularly in sectors like offshore oil & gas, chemical processing, and high-temperature steam systems.

Common Customization Options Include:

  • Extended necks or integral orifice unions for easier instrumentation access
  • Drain and vent ports for high-purity or hazardous systems
  • Insulation rings to minimize thermal transfer in cryogenic service
  • High-performance coatings such as:
    • PTFE / Xylan for corrosion resistance
    • Hot-Dip Galvanizing for outdoor installations
    • Electroless Nickel Plating for chemical resistance

These enhancements help extend service life, improve system safety, and ensure compatibility with specific process media.

Always confirm that any modification still adheres to the dimensional tolerances and pressure integrity requirements of ASME B16.36.

Which countries does Nutech Overseas export ASME B16.36 flanges to?

Nutech Overseas is a leading manufacturer and exporter of ASME B16.36 flanges, supplying high-precision orifice flanges to over 40+ countries across multiple continents. Our flanges are used in flow measurement systems for industries like oil & gas, petrochemical, power generation, and offshore platforms.

Major Export Destinations Include:

  • Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain
  • Southeast Asia: Singapore, Indonesia, Vietnam, Malaysia, Thailand
  • Europe: Germany, Spain, Italy, Netherlands, Poland
  • Africa: South Africa, Egypt, Nigeria
  • North America: USA, Canada, Mexico
  • South America: Brazil, Argentina, Chile

All exports are backed by international certifications including EN 10204 3.1/3.2, ISO 9001, PED, and full third-party inspection support from TUV, BV, DNV, or Lloyd's as required.

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