Shanxi Xinshunda Flange Manufacturing Co., Ltd. offers high-precision Class 150 Orifice Flanges designed specifically for accurate flow measurement in low to moderate pressure piping systems. As a critical component in custody transfer, process control, and monitoring applications, the Class 150 Orifice Flange pair provides a robust and standardized method for installing orifice plates without disrupting the pipeline. With nearly 20 years of forging and machining expertise, we ensure every Class 150 Orifice Flange meets strict dimensional tolerances required for repeatable and accurate differential pressure readings.
Specialized Design and Dimensional Accuracy
Unlike standard flanges, a Class 150 Orifice Flange set consists of a matched pair (hub and hub, or hub and slip-on) engineered with specific features to facilitate orifice plate installation. Key design elements include:
- Orifice Taps: Precisely drilled and tapped holes (typically 1/2" NPT) located at standard positions such as Flange Taps (1 inch from the plate face) or D and D/2 taps, ensuring accurate pressure sensing.
- Jack Screws: Integrated jacking screws allow for the easy separation of the flange faces to safely insert or remove the orifice plate without damaging the sealing surfaces or the gasket.
- Vent and Drain: Optional vent and drain connections can be added to the Class 150 Orifice Flange for purging air or draining liquids from the metering section.
- Facing: Typically supplied with Raised Face (RF) finishes, though Ring Type Joint (RTJ) options are available for specific low-pressure hazardous applications. The bore is machined to ensure the orifice plate sits perfectly concentric with the pipe flow.
We manufacture these components from Carbon Steel (A105), Stainless Steel (A182 F304/F316/L), and Alloy Steels, ensuring compatibility with various fluid types while maintaining the structural integrity required for ASME B16.36 Class 150 pressure ratings.
Critical Applications in Process Industries
The Class 150 Orifice Flange is widely utilized across industries where precise flow measurement is essential but operating pressures remain within the Class 150 limit (up to ~285 psi at ambient temperature for carbon steel).
- Oil & Gas: Used in gathering lines, natural gas distribution networks, and water injection lines for monitoring flow rates.
- Chemical Processing: Ideal for measuring the flow of acids, alkalis, and solvents in low-pressure reactor feed lines and product discharge.
- Water & Wastewater: Employed in large diameter water transmission mains and treatment plant intake/outfall lines for billing and process control.
- Power Generation: Utilized in condensate return lines, cooling water circuits, and low-pressure steam vents.
- HVAC: Used in large commercial heating and cooling loops for balancing and energy monitoring.
The ease of maintenance offered by the Class 150 Orifice Flange makes it a preferred choice for applications requiring frequent plate inspection or replacement due to wear or changing flow conditions.
Rigorous Quality Control for Measurement Integrity
Accuracy in flow measurement begins with the quality of the Class 150 Orifice Flange. At Shanxi Xinshunda, our manufacturing process adheres to ASME B16.36 and API MPMS (Manual of Petroleum Measurement Standards) Chapter 14.3 guidelines.
- Tap Alignment: We use precision drilling rigs to ensure orifice taps are perfectly aligned and perpendicular to the bore, preventing pressure reading errors.
- Surface Finish: The sealing faces are machined to a smooth finish (125-250 µin Ra) to ensure a leak-tight seal with spiral wound or non-asbestos gaskets.
- Bore Concentricity: Advanced CMM (Coordinate Measuring Machine) inspection verifies that the internal bore is perfectly concentric with the outer diameter and bolt circle, crucial for laminar flow profiles.
- Material Verification: All raw materials come with EN 10204 3.1 Mill Test Certificates, and final units undergo hydrostatic testing and Positive Material Identification (PMI) to guarantee material grade.
Packaging and Global Delivery
To protect the precision-machined surfaces and threaded taps of each Class 150 Orifice Flange, we utilize protective packaging strategies. Flange pairs are often shipped bolted together with a protective spacer to maintain face alignment and prevent damage to the raised faces. Threads are capped, and the entire assembly is wrapped in VCI (Vapor Corrosion Inhibitor) paper and secured in sturdy wooden crates. We provide full documentation, including dimensional reports, tap location certificates, and MTCs, ensuring seamless integration into your flow metering skids worldwide.
Why Choose Shanxi Xinshunda for Orifice Flanges?
Selecting Shanxi Xinshunda for your Class 150 Orifice Flange needs ensures you receive products manufactured with a focus on metrological accuracy and durability. We offer custom tap configurations, specialized materials for corrosive services, and rapid prototyping for non-standard sizes. Our technical team can assist with selecting the appropriate flange type (Hub-Hub vs. Hub-Slip On) and tap orientation for your specific flow computer setup. Trust our 19 years of experience to deliver Class 150 Orifice Flanges that keep your measurement systems accurate and your operations efficient. Contact us today for specifications and competitive pricing.
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