ENGINEERING DECISIONS
Engineering logic for this condition
Define flow in engineering units and at stated conditions. For gas, distinguish actual and standard volume and provide reference temperature, pressure and composition. For liquid, include density, viscosity, conductivity where relevant, vapour pressure and solids. State the true continuous minimum, intermittent batches, normal rate, maximum and zero state. A large turndown statement is not a substitute for checking the usable lower limit of the selected size and process.
Size the meter and surrounding pipe as one system. An oversized bore can produce velocity or signal below the useful region, while a reducer, restriction or smaller meter adds pressure loss and potential flashing or cavitation. Pulsating pumps, control valves, air pockets, partially filled pipes, vibration and upstream fittings may dominate the result. Show the piping layout and state whether flow is steady, bidirectional or batched.
Set the performance and verification objective. Distinguish repeatable control, leak indication, batching, totalisation and reference measurement. Define allowable error over the actual range, response, zero handling and pressure loss. Ask how calibration covers the intended fluid, range, orientation and units, then document commissioning zero and comparison checks. No low-flow capability or accuracy should be assigned to a TYCK SKU without its configuration-specific data.
Selection inputs and technical route
- Actual flow envelope
- True minimum, normal, maximum, batch size, duration, zero state and operating frequency.
- Fluid properties
- Phase, density, viscosity, conductivity, compressibility, composition, vapour pressure, solids and entrained gas.
- Hydraulic regime
- Pipe bore, velocity, Reynolds behaviour, pressure loss, flashing, cavitation and full-pipe condition.
- Process dynamics
- Pulsation, vibration, control valves, bidirectional flow, starts, stops and upstream disturbances.
- Verification objective
- Required result, range-specific error, response, zero handling, calibration and commissioning method.
Applications for engineering review
- Chemical or additive dosing where small batches, pulsating pumps, compatibility and containment are documented.
- Utility, purge or sample flows where gas reference conditions, pressure drop and leak sensitivity are defined.
- Low-load process operation where the normal pipe size creates a marginal velocity or signal and sizing can be reviewed.
Limitations and confirmation points
- A published turndown ratio does not by itself prove usable accuracy, repeatability or zero stability at the requested minimum flow.
- Pulsation, entrained gas, partial pipes, flashing and unsuitable calibration conditions can dominate nominal meter performance.
APPLICATION RFQ
Information to send for configuration review
- Mass, actual volume or standard volume result
- True minimum, normal and maximum flow
- Batch volume, duration and operating frequency
- Fluid phase, composition, density and viscosity
- Conductivity, vapour pressure, solids or entrained gas
- Pipe bore, material, orientation and layout
- Pulsation, valves, vibration and bidirectional operation
- Allowable pressure loss and flashing risk
- Output, response, zero and calibration objective
- Quantity and required sizing or calibration records
PRODUCT FAMILIES
Related product categories
APPLICATION FAQ
Frequently asked questions
Why is the true minimum flow more important than the pipe size?
The meter responds to flow through its measuring section, and an oversized bore may place the lowest rate below a usable velocity, signal or Reynolds region. Pipe size remains important for connections and hydraulics, but it should not dictate meter size without review. Provide minimum, normal and maximum rates plus allowable pressure loss. The sizing decision must also check reducers, full-pipe condition, flashing and how the selected configuration is calibrated.
How should pulsating dosing flow be specified?
Describe pump type, stroke or cycle frequency, volume per stroke, suction and discharge pressure, damping, valve action, batch duration and the required displayed or total result. A time-averaged plant rate can hide high instantaneous peaks and zero periods. Provide fluid properties and the piping layout. Selection should address response, peak capacity, reverse flow, air bubbles and installation, and commissioning should compare totals over representative batches.
What calibration evidence is useful for a low-flow application?
Ask for records that identify the instrument, configuration, calibration method, fluid or reference medium, units, orientation where relevant, test points and results across the required range. Check whether the lowest application rate is meaningfully represented rather than inferred from a higher point. Installation and process differences still matter, so retain commissioning zero and comparison checks. The needed evidence depends on whether the duty is control, batching, indication or a regulated result.