Precision Flow Control with ASME B16.36 RF A105 Orifice Flange Supplied by Haihao Group

In modern process industries where flow measurement is critical to efficiency and safety, the ASME B16.36 Orifice Flange serves as a vital component in differential pressure flow metering systems. Haihao Group, a leading global supplier of forged piping components, recently delivered a batch of Raised Face (RF) A105 Orifice Flanges to a Singapore-based client. These flanges were manufactured to meet the stringent requirements of ASME B16.36 and NACE MR0175, ensuring both performance and corrosion resistance in severe service environments.

What is an ASME B16.36 Orifice Flange?

The ASME B16.36 standard specifies the dimensions and tolerances for orifice flanges, which are specially designed flanges with tapped pressure ports. These flanges are installed in pairs and used with orifice plates to measure fluid or gas flow through a pipeline using differential pressure.

Key characteristics of ASME B16.36 Orifice Flanges:

1.Integrated pressure tap holes on each flange face

2.Compatibility with standard orifice plates

3.Available in raised face (RF) or ring-type joint (RTJ) sealing surfaces

4.Dimensional consistency with ASME B16.5 flanges for easy pipeline integration

Features of Haihao Group’s ASME B16.36 Orifice Flanges for Singapore Client

Haihao Group’s recently completed production for a project in Singapore included the following specifications:

Standard: ASME B16.36

Material: ASTM A105 Carbon Steel (suitable for ambient and high-temperature service)

Facing: Raised Face (RF)

Bore Thickness: Extra Strong (XS)

Compliance: Fully compliant with NACE MR0175 for sour service environments

Machining: Accurate tapping for pressure ports on both flanges, compatible with orifice plate and instrumentation

Why Choose A105 Orifice Flanges?

ASTM A105 is a widely used carbon steel grade for forged flanges and fittings, offering excellent mechanical properties and weldability. When normalized and processed correctly, A105 flanges provide:

• 1.High tensile strength and impact resistance
• 2.Good performance under pressure and temperature fluctuations
• 3.Cost-effective solution for general process applications

When combined with the ASME B16.36 orifice design, A105 flanges become a key element for accurate flow metering in pipelines, especially for:

• 1.Oil and gas processing
• 2.Refineries and chemical plants
• 3.Water treatment and utility systems
• 4.Power generation and steam systems

NACE MR0175 Compliance: Corrosion Resistance Guaranteed

Operating in corrosive environments—such as systems handling hydrogen sulfide (H₂S) or sour gas—requires materials that meet NACE MR0175 / ISO 15156 standards. Haihao Group ensures all carbon steel materials used for orifice flanges are tested and verified to comply with these requirements, protecting pipeline integrity and worker safety.

Applications and Benefits of ASME B16.36 Orifice Flanges

1.Precision flow measurement using differential pressure

2.Compact and standardized design ensures easy integration with control and instrumentation systems

3.Versatile use in both liquid and gas measurement applications

4.Improved operational safety with durable, high-integrity pressure tapping

Why Choose Haihao Group?

With over 40 years of experience in manufacturing industrial piping components, Haihao Group delivers customized, standard-compliant solutions for global clients. We offer:

Full range of ASME B16.36 Orifice Flanges in A105, stainless steel, and alloy grades

On-demand customization for pressure class, facing type (RF/RTJ), and bore thickness (SCH 40, XS, SCH 160, etc.)

Complete documentation package including MTCs (EN 10204 3.1), NACE certification, and dimensional inspection reports

Global delivery capabilities and technical support for integration with your pipeline measurement systems

Request a Quote

Whether you need standard orifice flanges or customized solutions for sour service and high-pressure applications, Haihao Group has the expertise and facilities to meet your needs.

Contact us today to request a quote or learn more about our ASME B16.36 Orifice Flange offerings. Email:sales@haihaogroup.com