6 Water/Wastewater
Hong Kong Water Network Protected by Leak Detector Network
Hong Kong was the first city in Asia to take advantage of the advanced leak detection capabilities of the Permalog noise loggers, with an initial deployment back in 1999. The loggers are placed on water pipes where they listen for the sound made by leaks, log the data and then transmit it for further analysis. This enables water companies to identify leak areas
quickly and efficiently; saving time, money and water by enabling a rapid, accurately-targeted response to repair the issue.
In Hong Kong, the Water Supplies Department (WSD) is in charge of maintaining the 7800km of underground water pipes in the city, and has a 15-year rehabilitation program costing billions of HK dollars to repair, upgrade and modernise the network. Their target is to reduce burst incidents from 2500/year in 2010 to 1000/year by 2015, and to decrease the leakage rate from 25% to 15%. Out of the 1100 cross-road pipes, around half are very old, and at increased risk of damage and disrepair.
When a pipe in the busy Wanchai district burst recently, the Hong Kong government identified a further 600 sites around the city where very old pipes run under busy streets, and deployed a new batch of Permalog+ noise loggers to watch for, identify and locate any leaks in these areas.
Permalog technology is made and developed in the United Kingdom by Halma Water Management (HWM-Water Ltd), and the company’s distributor in Hong Kong is Allied Power Technology Ltd. Allied Power has supplied over 800 sets of Permalog+ units with SMS repeaters to the region, and also has a contract with the local government to analyse the data gathered from the system.
When deployed with SMS repeaters, the Permalog+ devices can function together as a nodal network, with all data being automatically transmitted back to a ‘home station’ – in this case Allied Power’s offices. Every morning, the company receives the leakage data for each of the install sites, and makes recommendations to the WSD based on this information.
Davis Li, Managing Director, said: “We manage a huge amount of data every day, which has to be organised and presented clearly. Because the noise loggers are on busy roads for this project, there is quite a lot of interference from road noise, which can complicate our job. The main challenge of this monitoring work is to localise a leak when a correlation is simply not possible. In these situations, we usually use the Permalogs’ Aqualog function to differentiate interference and help identify the leak location.”
When in Aqualog mode, a Permalog+ logger will measure and log acoustic data at preset intervals over an extended period of time, typically at night to minimise the traffic noise. This data can then be presented graphically so trends, anomalies and incidents can be clearly identified. This effectively displays whether or not the noise is caused by a leak, since any leak noise will be consistent.
The combination of the automated leakage data transmission for general leakage alerts, and in-depth on- site analysis with Aqualog, means that leaks can be quickly identified and problems repaired before they cause major disruption or damage to Hong Kong and its residents.
Reader Reply Card No. 17 Oil in Water Monitor for Boreholes
Multisensor Systems (UK) has announced the launch of the MS1200, an on-line VOC Monitor for Hydrocarbon and Oil in Water concentration measurements. The MS1200 uses advanced gas sensing techniques to provide a non contact and reagent free system. The instrument is designed to measure VOC concentrations as low as 5 ppb.
The MS1200 implements a true concentration measurement together with an alarm system with user programmable alarm levels.
Unlike other methods of measuring VOCs the Multisensor product does not require laboratory facilities nor does it employ any chemicals in its implementation. This reduces costs and time in monitoring VOCs at borehole sites, at the input of water treatment works or at environmentally sensitive locations.
The Multisensor MS1200 Monitor works by passing gas, from the headspace above the water, across a sensor array. The data from the sensors is subsequently processed to provide concentration levels and statistics. There is no direct contact with the water being monitored resulting in servicing only being required every 6 months, minimising cost.
The instrument reports concentrations of VOCs using a variety of communications interface options, including wireless, digital wired interfaces such as Profibus and a 4 – 20mA analogue current loop for SCADA systems. Historical data is stored within the monitor and this can be downloaded for further analysis via the wireless interface or by connecting a PC to the USB port. This method is also used for firmware upload and reporting of instrument status.
Consuming a typical 10W and working with power supplies from 90V to 240V AC or 24V DC over a temperature range of 0 – 50o
C the product provides accuracy of better than +/- 10% using the
sample presentation system which is provided. The MS1200 is available now as a system mounted on a backboard or as individual components.
Reader Reply Card No. 16
New Portable Ultrasonic Flow and Heat Meter
Dynasonics (USA), a division of Racine Federated Inc., announces the launch of the new DXN portable ultrasonic flow and heat meter.
“The DXN represents a new generation in portable ultrasonic flow measurement,” said John Erskine, VP of Sales & Marketing, “built on innovative hybrid metering technology that automatically switches between transit time and Doppler modes, as needed. The DXN also includes unique one-of-a- kind features like a 7” full colour touch-screen, the ability to store site- specific settings using plain text, and an
advanced software interface that adapts to the needs of our customers.”
On-line Toxicity at Any Time! ToxAlarm
• Drinking Water • Surface Water • River Monitoring
• Measurement Cycle 5 Min. • Highest Sensitivity • No Memory Effects
• Self-regenerating Biomass Inside
www.lar.com
Built on a truly unique, rugged hardware platform that leverages modern micro-processing and digital signal processing, and inspired by the latest user interface advancements in consumer electronics, the DXN ushers in a new era for portable ultrasonic measurement. “With extremely rapid response times on the order of 20 milliseconds and faster, DXN can handle some of the toughest applications out there,” said Erskine, “all through the most user-friendly interface in the industry. You can have reliable, repeatable flow measurement up and running on the job site in less than five minutes.”
DXN is currently available in a variety of kit configurations, from a basic kit that includes two sets of transit time transducers, cabling and a convenient compact carrying case, all the way up to a complete kit that includes transit time, Doppler, RTD and wall thickness gauge.
Reader Reply Card No. 18
Do you receive your own copy of Asian Environmental Technology? If not request your copy today. IT’S FREE!
info@aet-pub.com Reader Reply Card No. 19 AET Annual Buyers’ Guide 2012
www.envirotech-online.com
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100
