Water New Zealand Web Forum

Petrina · Joined: 28 Jun 2007 Posts: 6 Location: Hokitika

Hi. Has anyone modeled their water network and gathered pressure data to calibrate it. If so how was the data collected? We have a basic network model but are having trouble locating a pressure data logger or similar system to record pressure data over a 24hour period. If anyone has some suggestions it would be much appreciated.
Petrina

Dan Stevens · Joined: 12 Jun 2008 Posts: 2 Location: Christchurch

Hi Petrina

I would suggest you have a chat with either Mike McTigue at Waimate or Gerard Cody at Timaru. Both have recently done water models of their towns and rural supplies including comprehensive pressure monitoring and model calibration. Either would be able to offer you some avdice.
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Dan Stevens

Dylan Stuijt · Posted: Fri Dec 11, 2009 10:03 am Post subject:

If you have hydrants, or even basic hose fittings you’re in luck. You can even install a new tapping band and you’re away. You can use a Metrolog Data logger, with special hydrant or tap fittings, which can also be supplied. These are used by many councils and can measure flow and pressure in the same unit. We typically record pressures at 10min intervals, and this would last about three months in the feild before the memories full.

The able folk at Jeff Booth Consulting Limited would be more than happy to help out. They also hire equipment, if you don't want to make the step of buying. (07) 347 0075 or http://www.jeffboothconsulting.co.nz

Good Luck.
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Water Supply Manager - Hastings District Council

WTRBOY · Joined: 16 Jan 2009 Posts: 9

Apologies for the sales pitch but static loggers are soo last century. AWT can pick up any 4-20mA transducer output and transmit this to our server. It can then be viewed via the AWT website virtually immediately in raw form and later in confirmed form. This can suit either permanent or temporary installations for flow and/or pressure. Same service available for sewer flows, overflows etc. Benefits include secure storage of data, access to alarms and ability to immediately review recent (and longterm) history. Contact Peter Stephens on 09 374 1580

Dylan Stuijt · Posted: Mon Jan 25, 2010 6:49 pm Post subject:

Can't agree more. All of our water sites, and most of our sewer and stormwater telemetry sites have pressure transducers and flow recorders sending data via a 4-20mA output to our scada system and PC. I'd recommend independantly calibrating the pressure loggers from time to time though, just to ensure they're reading correctly.
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Water Supply Manager - Hastings District Council

Gavin Hutchison · Joined: 20 Jan 2010 Posts: 1

If you are looking at calibration you will need to buy/hire data loggers that will be located on fire hydrants in your network as you need good coverage. Speak to Jeff Booth regarding this.

Once you complete calibration you want to continue to monitor your network, but with a far lower concentration of loggers than during calibration. Where you can install pressure transducers at sewer pump stations with telemetry this is cost effective, but unless you plenty of sewer pump stations you will need some data loggers you can deploy when required.