Orifice Flow Meters
Cost-effective flow measurement solution for gases, liquids, and steam
Engineered for extreme reliability, our orifice plate series excels in high-pressure and high-temperature processes where electronic sensors often fail. With a robust design and a wide caliber range (up to DN1200), it transforms complex fluid dynamics into a stable differential pressure signal. It is the definitive choice for heavy industries looking for a durable, low-cost-of-ownership measurement solution.
- Flow Accuracy: ±1.0% | ±1.5%
- Nominal diameters: DN25 ~ DN1200 to fit any industrial pipeline.
- Extreme Pressure Capability
- No moving parts, no calibration
- Accurately measures the flow of clean liquids, general gases, and high-temperature steam.
Request QuotationTechnical Consultation
Proven Technology, Predictable Performance, Minimal Maintenance
Parameter | Specification |
|---|---|
Measurement Principle | Differential pressure (Bernoulli's equation) |
Standards Compliance | ISO 5167, ASME MFC-3M, AGA Report No. 3, API MPMS Chapter 14.3 |
Application | Custody transfer, process control, energy management (gases, liquids, steam) |
Pipe Size Range | DN15 – DN1200 (½" – 120") |
Flow Accuracy | ±1.0% (with proper installation and calibrated DP transmitter) | ±1.5% (typical field conditions) |
Repeatability | ±0.1% of reading |
Rangeability | 3:1 to 4:1 (limited by differential pressure transmitter range) |
Beta Ratio (d/D) | 0.20 – 0.75 (typical range for best accuracy) |
Reynolds Numbe | >4,000 (turbulent flow required for standard calculations) |
Pressure Range | Up to 40 MPa (PN400) | Higher with fully welded or lens-type designs |
Temperature Range | -200°C to +650°C (material and gasket dependent) |
Orifice Plate Material | 316/316L SS (standard), Hastelloy C, Monel, Titanium, Duplex SS (corrosive service) |
Bore Tolerance | ±0.05% of diameter (precision machined and inspected) |
Pressure Tap Types | Flange taps (standard), Corner taps, D and D/2 taps, Pipe taps (radius taps) |
Gasket Material | Graphite, PTFE, spiral-wound metal, RTJ (pressure/temperature dependent) |
Orifice Holder | Paddle-type (removable), Plate carrier, Orifice flange assembly |
Flow Conditioner | Optional for installations with inadequate straight pipe |
DP Transmitter Integration | Smart DP transmitter with square root extraction, temperature/pressure compensation |
Output Signals | 4-20mA, HART, Foundation Fieldbus, Profibus (from DP transmitter) |
Temperature Compensation | Built-in RTD (PT100) for steam mass flow calculation |
Pressure Compensation | Optional pressure transmitter input for mass flow |
Protection Rating | Sensor: IP67 | Electronics: IP65 (remote mount) |
Configuration | Integrated (compact) or Remote (separate electronics) |
Quality Certifications | CE |
Understanding When Orifice Plates Are the Right Choice
Advantages:
- Lowest initial cost (60-80% less than electromagnetic meters)
- No moving parts—minimal maintenance
- Standardized calculations (ISO 5167)—no individual calibration
- Custody transfer approved (AGA, API, ISO)
- Universal fluid compatibility (gases, liquids, steam)
- High temperature capability (-200°C to +650°C)
- High pressure capability (to 40 MPa+)
- Sizes available from DN15 to DN3000
Limitations:
- Permanent pressure loss (40-60% of ΔP not recovered)
- Limited turndown ratio (3:1 to 4:1)
- Requires significant straight pipe (10D-44D upstream)
- Accuracy degrades with flow disturbances
- Not suitable for slurries or dirty fluids (concentric plates clog)
- Periodic inspection and replacement required
- Requires separate DP transmitter and flow computer
- Less accurate than Coriolis or electromagnetic at low flows
Trusted Flow Measurement Across Critical Industries
Orifice plates measure gases, liquids, and steam in demanding applications worldwide
Petrochemical & Oil Refining
The primary choice for high-pressure gas and liquid lines. Its solid construction and ISO-standardized accuracy ensure safe and reliable process monitoring in volatile chemical environments.
Thermal Power & Steam Generation
Indispensable for monitoring feed water and steam distribution. It withstands the extreme temperatures and velocities of high-pressure steam, providing the data needed to optimize boiler efficiency.
Metallurgy & Heavy Manufacturing
Used for measuring industrial gases and cooling water in steel production. Its rugged design thrives in high-vibration and high-heat zones where other technologies drift or fail.
Water Conservancy & Municipal Drainage
Applied in large-diameter municipal pipelines (up to DN1200). Its simple structure and low cost make it the most efficient solution for large-scale water distribution and infrastructure monitoring.
Chemical Process Regulation
Provides the stable differential pressure signal required for automated control valves. Its reliable performance ensures consistent chemical mixing and regulation, safeguarding product quality and plant safety.
Get Accurate Flow Measurement at the Lowest Total Cost
Proven technology for your most critical applications. Contact us with pipe size, fluid type, and flow range—receive ISO 5167-compliant sizing calculations within 24 hours.
info@hbmeter.cc
(+86) 152-3780-0315
1 Jingsan North Road, Xiangfu District, Kaifeng, Henan 475004 China
About HBmeter
AFT Instruments is a high-tech manufacturer delivering precision flow instrumentation for water, chemical, power, industrial automation, and process industries.
View moreContact Us
info@hbmeter.cc
(+86) 152-3780-0315
(+86) 152-3780-0315
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