Flow Products - Overview

Accurate and reliable flow measurement equipment is essential for all types of industry processes all over the world. Whatever your process requirement for flow measurement, be it water, oil and gas, air, steam, waste water or other fluid, we have the answer, combined with the added flexibility of designing and manufacturing a system to suit your requirements.

Our vast knowledge and experience of providing solutions for organisations worldwide has proven our understated capability to provide the complete range of flow measurement equipment.

Our custom-designed measurement solutions are typically of the differential pressure (DP) type, including orifice plates, Venturi tubes, Pitot tubes and flow nozzles.

Orifice Plates
The most common and widely used differential producers, suitable for a wide range of flow measurement applications in line sizes of 50 mm and above. Choose ‘concentric square edged’ for general application, ‘conical entrance’ or ‘quarter circle’ for low Reynolds number flows, and ‘segmental’ or ‘eccentric’ for flows containing light solids and slurries.

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>> Tab Handled Orifice Plates
>> Orifice Carrier Assemblies
>> Restriction Orifice Plates
>> Multi-stage orifice Plates
>> RTJ Type Orifice Plates
>> ANSI B16.36 Orifice Flanges

Please note that these links will take you the Thermocouple Instruments website

Flow Nozzles
For measurements where high temperatures and velocities are present, the flow nozzle may provide a better solution than an orifice plate. Its construction makes it substantially more rigid in these adverse conditions and flow coefficient data at high Reynolds numbers is better documented than for orifice plates. The inlet is contoured, and may be either radius entrance (ISA1932) or elliptical entrance (ASME long radius). The flow nozzle has about a 65% greater flow capacity than an orifice with the same diameter.

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Venturi Tubes
There are two common types of Venturi tube - the Venturi nozzle, and the classical Venturi. Both feature a convergent inlet section and a divergent outlet section. The major advantage of the Venturi over orifice plates and flow nozzles is in the area of pressure recovery. Typically, unrecovered pressure is in the region of 10 - 30% of measured DP as opposed to 40 - 90% for an orifice plate (depending on beta ratio). Although the cost of a Venturi can be comparatively high, where pumping costs are important the initial outlay can be justified. Another advantage of the classical Venturi over the other differential
pressure producers is that the requirements for upstream and downstream straight pipe lengths are somewhat less onerous.

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Pitot Tubes
These practical and effective DP primary elements can, in some applications, match Venturis in terms of performance at a substantial cost advantage, especially for large diameter pipelines. A number of upstream facing ports effectively average the velocity profile and allow for measurement of impact, or stagnation pressure, and a pressure port (or ports) located behind the tube measures the static pressure, the difference being used to infer the flow rate. The differential pressures produced from such
devices are considerably lower than from the other DP elements, which can limit their usefulness in certain applications. However, they present little resistance to the flow and as such exhibit excellent unrecovered pressure loss characteristics (it may be considered as negligible in many circumstances). Installation of averaging Pitots is simple and inexpensive, and since there are no sharp edges to wear, averaging Pitot tubes offer good long term accuracy.

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Differential Pressure Gauges
A range of high quality, cost effective and reliable differential pressure gauges designed to measure the difference in pressure between two points in a system and show it on a single dial gauge.

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With their simple and compact design this range offers outstanding value for money.

Flow Recorders
Utilising a high quality differential pressure unit, the Clearscan range of circular chart recorders includes options for measuring temperature and pressure as well as flow.

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