Primary flow measurement devices designed to deliver the required flow measurement system performance with documented uncertainty in accordance with internationally recognised standards

Designed and locally manufactured in Western Australia for Australia and the pacific region.

Venturi Nozzles
Venturi nozzles ranging in size from DN80 to DN600 in service throughout Australia.



Uncertainty of discharge coefficient, Cd is as specified in ISO 5167-3, typically <2%.

Calibration in an ISO 17025 accredited flow laboratory over design Reynolds Number flow range yields <0.5% uncertainty.

ISA 1932 Nozzles
Designed in accordance with ISO 5167-3 again with VNOZ designed simple wafer style mounting and integral 3/4" NPT pressure connections



Uncertainty of discharge coefficient, Cd is as specified in ISO 5167-3, typically <1%

Calibration in an ISO 17025 accredited flow laboratory over design Reynolds Number flow range yields <0.5% uncertainty

Advantages of Nozzles:

• No moving parts reliability
• Impervious to flow surge and contaminants
• Can operate (at increased uncertainty) up to sonic (choked flow) velocity
• Easily installed (in a drop-out spool for ease of inspection/change-out/resizing)
• Minimal upstream flow conditioning
• Well researched and proven
• Excellent pressure recovery (low cost to operate)
• Easily integrated into DCS/SCADA

Nozzles can be used with smart multivariable transmitters to deliver Mass and Std Volume flow
(Note, this usually requires regularly updated fluid composition unless the composition is reasonably consistent within uncertainty bounds)

Restriction (sonic) nozzles & orifice plates
Restriction nozzles and orifice plates for flow limitation and equipment protection.



Advantages:

• Simple & cost effective
• Excellent sub-critical pressure recovery (nozzles)
• Easily installed clamp between flanges
• Excellent excess flow protection for turbine and positive displacement meters
• Pressurisation and blowdown rate limitation

Flow Conditioners
Designed to standards (ISO 5167) to suit any application:



Advantages:

• Re-distributes the flow profile
• Reduces swirl and turbulence