ASME PTC-6 Flow Nozzle
± 0.25% Always Calibrated
Highest Accuracy / Repeatability
- Line Size: 4” to 28”
- Head Loss % of Differential: 60% to 85% beta dependent (18% to 25% with optional outlet diffuser cone)
- Recommended Application, THROAT Reynolds Number: Greater than 500,000
ASME PTC-6 Flow Nozzle for Highest-Accuracy Steam Turbine Performance Testing
The ASME PTC-6 flow nozzle is a specialized differential pressure device designed to deliver the highest accuracy and repeatability required for steam turbine efficiency testing under the ASME PTC-6 Performance Test Code. Primary Flow Signal supplies PTC-6 nozzles as complete assemblies, including integrated upstream and downstream pipe spools, a flow conditioner, and an optional nozzle outlet diffuser cone to significantly reduce permanent pressure loss.
PFS PTC-6 flow nozzles are always calibrated and guaranteed to meet the stringent laboratory calibration criteria necessary for turbine performance testing. Because PTC-6 applications carry high risk if calibration requirements are not met, PFS calibrates each unit independently at a leading high Reynolds number facility and provides the documentation needed to support defensible test results. PFS also specializes in the refurbishment of nozzle runs for existing installations.
Key Benefits & Features:
- Always Calibrated, High Accuracy: Typical uncertainty of plus or minus 0.25%, supporting demanding performance test requirements.
- Best-in-Class Repeatability: Repeatability better than ±0.1% for stable, defensible measurement.
- PTC-6 Compliance: Designed specifically to meet ASME PTC-6 requirements for turbine efficiency testing.
- Complete, Jobsite-Ready Assembly: Supplied with integrated pipe spools and flow conditioner for consistent, standards-aligned performance.
- Durable, Low Maintenance Design: No moving parts and lower susceptibility to erosion support long service life.
- High Velocity Capability: Well-suited for high velocity applications and high pressure or high temperature services.
- Refurbishment Expertise: PFS offers refurbishment services for nozzle runs to extend asset life and restore performance.
PTC-6 Flow Nozzles are primarily used for steam and water flow measurement in power generation environments, especially where turbine performance testing and high-accuracy efficiency verification are required.
Construction Standards
ASME Section I
ASME B31.1 Power Piping
ASME B31.3 Process Piping
Design Standards
ASME PTC-6
ASME PTC-6 Flow Nozzle Specifications
ASME PTC-6 Flow Nozzle Model Types
Model Types
- PTFFR – PTC-6, Flanged Nozzle, Flanged Ends, Run
- PTFWR – PTC-6, Flanged Nozzle, Welded Ends, Run
- PTWFR – PTC-6, Welded Nozzle, Flanged Ends, Run
- PTWWR – PTC-6, Welded Nozzle, Welded Ends, Run
ASME PTC-6 Flow Nozzle Materials
Typical material selections for standard applications:
- Carbon Steel
- 304/316 Stainless Steel
- Chrome Moly
Other options for material selection (not limited to):
- Aluminum
- Zirconium
- Hastelloy
- Monel
- Duplex SS
- Titanium
- Tantalum
- 321 SS
ASME PTC-6 Flow Nozzle Certifications
PFS is a contributor to various international standards committees, fully supporting our staff’s memberships to these commissions.
Individual products follow relevant industry regulations, including requirements specific to the oil and gas, water/wastewater, and power generation industries.
PFS maintains the following certifications, standards & compliances:
- ISO 9001
- AGA
- ASME S & U
- API
- ANSI
- European Pressure Equipment Directive (PED)
Applications
Power Generation & Turbine Testing
ASME PTC-6 flow nozzles are primarily used in power plants for steam and water flow measurement tied to steam turbine performance testing. Their always-calibrated accuracy supports defensible efficiency verification and performance reporting.
Industrial Commissioning & Performance Validation
During new installs, retrofits, and major turbine upgrades, PTC-6 flow nozzles provide repeatable flow data used to validate performance and reduce uncertainty. Complete nozzle run assemblies support consistent installation in high-value test setups.
Industrial Efficiency Verification & Test Loops
PTC-6 flow nozzles are used when heat rate and efficiency data must be measured with high confidence, including benchmarking, audits, and third-party verification. They are also a strong fit for controlled steam and hot water test loops where precision and repeatability are required.
ASME PTC-6 Flow Nozzle Expertise From PFS Since 1983
Four Decades Supporting High-Accuracy Power Testing
PFS has over 40 years of experience delivering differential pressure flow measurement solutions for demanding steam and water service. Our ASME PTC-6 flow nozzles are built for turbine performance testing where accuracy, repeatability, and defensible results are critical.
Engineering Support for Performance Test Requirements
From nozzle selection and run configuration to installation guidance and test readiness, PFS supports performance testing teams with practical, standards-aligned expertise. We help reduce uncertainty and support repeatable results in high-risk test environments.
Always Calibrated, Jobsite-Ready Nozzle Run Assemblies
PFS supplies PTC-6 nozzles as complete assemblies with integrated spools and flow conditioning, with every unit individually calibrated at a high Reynolds number facility. Documentation and refurbishment support are available to help protect long-term performance.
