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Water Flow Measurement and Control

Shifting water from one place to another was always a great challenge. Although the Romans are generally considered to be the greatest builders of aqueducts in ancient times, quanta systems were used hundreds of years earlier in the Middle East. Water flowed by the force of gravity, generally through a series of distribution tanks.

A dig at 30 Gresham Street in London unearthed long sections of a Roman bucket-chain for lifting water just a few years ago. This was a simple chain of wooden hoppers that collected the water from below in small portions.

By the late 16th century a system was in operation in london that used five waterwheel pumps under London Bridge that supplied the capital. Paris too had a similar one at Point Neuf that pumped some 120 gallons per minute.

Beyond the Romans' wildest dreams, we now have water pumped in almost building. We need to measure and control the flow of water, both hot water and cold water. Cold-water meters are used for measuring the supply of water and those that are used for domestic purposes in England and Wales are controlled by the Measuring Equipment (cold-water meters) Regulations, made under the Weights and Measures Act 1985.

This Act protects consumers and prevents water pum manufacturers in the UK from installing or supplying faulty or unfair meters. Thje type or design of Water meters must be approved by the Secretary of State for Trade and Industry (NWML). The water meters must be tested, passed and stamped as fit for use before being commissioned. Water Meters must be the right type for the installation in question and meet the criteria in clause 2 of BS 5728 Part 2: 1980.

Trading Standards officers have the power to test and inspect such meters and where they find it registering outside the allowed limit of error, they have the power to take the meter out of use. The example cold-water meter illustrated here is a Volumetric Marty II.
Size and Nominal Flow Rates: DN 15 - QN 1,5 m3/h, Working Temperature: For cold water up to 30°C. Working Pressure: 16 Bar, Accuracy: - Qmax-Qt +/- 2% Qt-Qmin +/-5%. Installation in horizontal, vertical or inclined plan. Offset connectors make for easy wall mounting. The meter must be protected from frost, however total immersion is possible without fear of damage. Remote readout system - The MARLY system can be pre-equipped for pulse transmission. On request, the pulse output can be factory set at 0,25 / 0,50/ 1 / 10 / 10. In addition to the pulse readout Ref. ILSM, Super-Dry Dial, Direct magnetic drive, No wire or lead seals are used, All materials are suitable for drinking water, A filter can be fitted in the meter inlet and non return 'check valve' can be fitted in the meter outlet
EEC approval: B93 314.22. The MARLY II is a positive displacement meter design providing an extended flow range and low head loss. Materials are chosen to guarantee long life and accuracy even when used with contaminated water. Available Models: 1/2 - DN15 Specification

Picture Courtesy Of
Direct Metering Supplies

News Release By

Peter Yexley
UKHQ
Hertfordshire Internet
The Granary
Redwell Wood Farm
Ridge
Hertfordshire
EN6 3NA

01707 646457
Email. peter@ukhq.com