FlowMaster
Dual Chamber Orifice Fitting
The Dual Chamber Orifice Fitting is a proven system for safe and quick inspection or replacement of orifice plates without breaking or depressurizing the flow line.
With its advanced sealing system, there is no need for lubrication or greasing, reducing maintenance while ensuring long-term reliability. Designed and manufactured to ISO 5167, AGA-3, ASME B16.5, ASME B16.34, and MSS SP-55 standards, this fitting is built for high-integrity custody transfer and process measurement applications.
All fittings include a complete documentation package with hydro-tests, valve seal tests, liquid dye penetration tests, and quality inspection reports. Optional NDT testing (radiography, ultrasonic, magnetic particle) and material certifications are also available.
- Allows orifice plate changes under pressure safely
- Built to ISO 5167 / AGA-3 / ASME B16.5 / ASME B16.34 standards
- No lubrication or greasing required
- Supplied with full quality documentation and inspection reports
- Supports multiple flange and weld end configurations
- Traceability per ISO 9001 Quality Control System
- Wide material and sealing options to suit process requirements
Body Materials
WCB, WCC, LCC, CF8M, Duplex (Gr4A, Gr6A), others on request
Internal Parts
AISI 316 SS or Duplex SS (others on request)
Sizes & Ratings
DN 2”–12”: ANSI 150–2500 (RF flange)
DN 14”–16”: ANSI 150–1500 (RF flange)
DN 18”–30”: ANSI 150–600 (RF flange)
DN 600, 900, 1500 also available in RTJ
Process Connections
Flange × Flange, Flange × Weld Neck, Weld Neck × Weld Neck
Internal Bore Sizes
40, 60, 80, 100, 120, 160 (others on request)
Seals
HNBR O-Ring, Viton, others available
Operating Temperature
-26 °C to +204 °C (others on request)
Dimensional & Eccentricity Repeatability
Per AGA-3 / ISO 5167
- ️ Oil & Gas – Custody transfer and pipeline metering
- Chemical & Petrochemical – Process flow monitoring with high uptime
- Power Generation – Utility gas and steam measurement
- Water & Wastewater – Large line flow metering where shutdowns must be avoided
- Industrial Utilities – Continuous measurement with under-pressure plate changes
