Reliable metering systems Neil Macleod Metering hierarchy Transfer - - PowerPoint PPT Presentation

reliable metering systems
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Reliable metering systems Neil Macleod Metering hierarchy Transfer - - PowerPoint PPT Presentation

Reliable metering systems Neil Macleod Metering hierarchy Transfer meters to ensure an accurate determination of SIV Zone or district meters to facilitate analysis of consumption Customer meters for billing purposes Deduction


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SLIDE 1

Reliable metering systems

Neil Macleod

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SLIDE 2

Metering hierarchy

  • Transfer meters to ensure an accurate

determination of SIV

  • Zone or district meters to facilitate analysis of

consumption

  • Customer meters for billing purposes
  • Deduction meters for multiple family

developments

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SLIDE 3

Transfer meters

  • High accuracy metering (multiple head

ultrasonic or magflow meters) are justified for high volume transfer points

  • Regular drop testing or electronic calibration is

essential

  • In Durban 17 meters out of more than 80 in

total, measure more than 95% of the total

  • SIV. Make use of the Pareto principle !
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SLIDE 4

Zone and district meters

  • Data logging at this level of measurement is

most effective for determination of minimum night flows and ILI values.

  • These meters should be read on the same day

that the customer meters in the zone it supplies are read.

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SLIDE 5

Customer metering 1

  • We prepare positive displacement meters to

inferential meters for domestic or residential customers

  • ICI customers are metered using inferential

meters primarily

  • Inferential meters require strict compliance

with installation instructions to ensure accuracy

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SLIDE 6

Customer metering 2

  • Meter accuracy is affected by water quality,

time and the total volume of water that has passed through the meter.

  • Our domestic meters remain compliant with

the Trade Metrology Act until they are about 15 years old.

  • Positive displacement meters that are 20 years
  • ld, under-read by 7% and it is cost effective

to change them at that point

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SLIDE 7

Pre-paid or credit meters ?

  • Prepaid meter installations typically cost in

excess of R1500 compared to R500 for conventional installations

  • Tampering is a consideration if meter

installations are not visited regularly

  • Flow limiters as a credit control mechanism
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SLIDE 8

Flow limiter

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SLIDE 9

Meter reading

  • Monthly reading and billing based on actual

readings and not estimates is essential

  • Reading rates vary from 200 reads per meter

reader per day in CBD blocks to over 700 in townships

  • Technology choice is critical: minimum

features today for a hand held terminal must include; GPS, a camera, sufficient memory to store up to 1000 readings, robust and water proof construction and a 10 hour battery life

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SLIDE 10

Multi-unit metering

  • Bulk meter in the name of the body corporate
  • Individual meters to each unit with accounts in

the name of the occupants of each unit

  • A charge of R7 per reading to each customer.
  • This allows each customer to become a direct

customer of the municipality and pay for the actual water used. Credit management is more targeted.

  • The difference between the total consumption

and the sum of the consumption at each unit is billed to the body corporate at ICI rates

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SLIDE 11

performance

  • Collection rate of about 95%
  • Bill 98% of urban customers on actual

readings each month

  • Customers still want proof that their meter is

read each month

  • Photographic record makes for unintended

efficiencies

  • Aim to continually improve performance