What Are Orifice Flanges and How Do They Work
Orifice flanges are specialized piping components designed for precise flow measurement in pressurized systems. Unlike standard weld neck flanges, orifice flanges feature tapped holes (pressure taps) drilled radially through the base, enabling accurate differential pressure readings across an orifice plate.
At Songhai Flange, we understand that proper flow measurement is critical for custody transfer, process control, and regulatory compliance.
The Science Behind Orifice Flow Measurement
When fluid passes through an orifice plate precisely sized bore, it creates a pressure differential between the upstream and downstream sides. This allows instrumentation to calculate exact flow rates using Bernoulli principle.
The accuracy depends on:
- Proper flange tapping location (flange taps, corner taps, or D and D/2 taps)
- Correct orifice plate bore diameter and beta ratio (typically 0.3 to 0.7)
- Adherence to ASME B16.36 and API 2530 standards
- Proper installation orientation based on fluid type
Orifice Flange Types and Configurations
Weld Neck Orifice Flange Pairs
The most common configuration for critical applications with jack screws for maintenance without cutting pipeline.
Slip-On and Threaded Options
For lower-pressure utility applications (Class 150 and 300), cost-effective alternatives with reduced space requirements.
Material Selection
- Carbon Steel (A105): Oil, gas, petrochemical, -20F to 800F
- Stainless Steel (F304/F316): Corrosive service, marine applications
- Low-Temp (A350 LF2): LNG, cryogenic applications
- Chrome-Moly (F11/F22/F91): High-temperature power generation
ASME B16.36 Specifications
| Specification | Details |
|---|---|
| Size Range | 1 inch through 24 inch |
| Pressure Classes | 300, 400, 600, 900, 1500, 2500 |
| Materials | A105, F304/F304L, F316/F316L, A350 LF2 |
| Flow Standard | API 2530 / ISO 5167 |
Why Choose Songhai Flange
Songhai Flange manufactures orifice flanges to ASME B16.36 standards with full material traceability. Contact us for competitive quotes and technical support.
WhatsApp: +86-18658777855
Email: 1007788887@qq.com
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