ABB TORBAR
A multipoint probe that averages dynamic pressure. Particularly useful for large diameters, retrofits and applications requiring lower permanent pressure loss than an orifice plate.
Orifice · averaging Pitot · Venturi · nozzle
DP primary elements, orifice plates and TORBAR
DP technology remains an industrial standard because it is simple, traceable and suitable for liquids, gases and steam. The complete measurement chain matters: primary element, impulse lines and manifold, and differential pressure transmitter.
Orifice / FPD175
A compact primary element for liquids, gases and steam, which can be integrated with a manifold and DP or multivariable transmitter. A widely established solution, although permanent pressure loss must always be assessed.
Orifice flanges / orifice plateEconomical, standardised and easy to inspect. They introduce a permanent pressure loss related to the beta ratio and the differential pressure generated.
TORBAR / PitotPermanent pressure loss is very low, and weight and cost are often favourable at large diameters. Correct installation geometry and clean pressure ports are essential.
When we recommend them
- EPC or customer specifications based on ISO/ASME standards and DP flow measurement.
- Steam and gas in power generation and oil and gas.
- Large diameters where Pitot or TORBAR offers an economic advantage.
- Applications where DP transmitters are already a plant standard.
- Applications requiring a simple primary element without electronics inside the pipe.
When to assess alternatives
- When the energy cost of orifice pressure loss is high.
- Very dirty fluids that can block impulse lines or pressure ports.
- Very wide ranges: the Q∝√ΔP relationship limits the turndown of the measurement chain.
- Insufficient straight runs with no option for flow conditioning.
- Straightforward conductive water applications: an electromagnetic meter may be more direct.
Differential pressure or multivariable transmitter?
The electronic part of the measurement chain is covered in the Pressure section.
Explore DP transmitters Explore multivariable transmittersABB documentation · Flow
ABB datasheets and manuals
Download model-specific PDFs with language and revision details. Shared manuals and commissioning instructions are identified in the document cards.
TORBAR FPD350
Averaging Pitot probe. English manual revision H and Italian manual revision G, an earlier edition.
FPD175 compact orifice
Datasheet and manual for the FPD175 compact primary element.
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Tell us about your flow measurement
The more details you provide, the sooner we can select the right technology and nominal size.
Technical FAQ
Frequently asked questions
Orifice or TORBAR?
Orifice plates are standardised and widely used, but cause greater permanent pressure loss. TORBAR is an averaging Pitot option for large diameters and applications requiring lower pressure loss.
How is an orifice plate sized?
Not from pipe diameter alone. Flow, pressure, temperature, density, viscosity, composition, beta ratio, the applicable standard and acceptable differential pressure or pressure loss are required.
Why does a Pitot probe have multiple holes?
TORBAR averages dynamic pressure at multiple points across the profile, reducing sensitivity to local velocity compared with a single-point measurement.
When should I use a multivariable transmitter?
For gases and steam requiring pressure and temperature compensation of mass flow, a multivariable transmitter can combine differential pressure, pressure, temperature and calculation.
What is the difference between 3-valve and 5-valve manifolds?
Both provide isolation and equalisation. A 5-valve manifold typically adds vent or test valves to simplify calibration and maintenance.
What is the most common Pitot installation error?
Incorrect alignment to the flow, incorrect insertion depth, insufficient straight runs or blocked sensing ports.