|Leak Detection||Pipe Tracing||Industrial/Domestic Leaks|
|Water Audits||Flow/Pressure Measurement||Wireless Data Logging|
Aqualeak leak detection service is a non-invasive, non destrutive, accurate leak identification service. Our specially trained experts are highly skilled to accurately locate the most difficult leaks, with state of the art equipment, without destruction. We are the leak detection specialists used by Local Authorities, local group water schemes, commercial/industrial premises and domestic users.
Leak Detection Methods
Once Aqualeak is called in to detect a leak on a network it firstly collects and studies all necessary data to enable a thorough examination of the network to be completed. The appropriate testing and inspection process is specifically chosen to suit each particular case. If possible a step test is conducted to localise the location of the leak. Once this is completed Aqualeak then uses the latest Sebakmt technologies to find the leak:
- Noise level and frequency loggers – these wireless loggers can be placed along the network over a fixed period(usually overnight). The data can then be remotely recorded and analysed on the mobile commander. Loggers measure the noise level (db) and the frequency of a leak simultaneously. Leaks typically have a high decibel level and a narrow noise spread. High noise levels are an indication of a leak. Aqualeak then receives visual assistance from a colour coded highlighting system which shows areas of the network with a high noise level.
- Digital correlator - If a pipe length is shown to have a high noise level it is then possible to pin point the leak using the Correlux P-250. Correlators are two transmitters or accelerometers that measure the time difference between two points, from the mechanical vibration the water leak makes as it leaves the pipe and the time or the velocity of the pipe for the noise to be heard at each correlation unit. These vibrations travel through the pipe wall (as minute vibrations) and in the water column (as a pressure wave).The software then produces a line correlation graph which shows the distance from the sensor to the leak.
- Acoustic ground microphone - It is then possible to confirm that there is a leak in the pipe by using the HL5000 to listen to the leak. The ground microphone picks up the sound of the leak and graphically displays the volume and the frequency spectrum. The sound is loudest directly over the leak.
Knowing the location of a watermains is essential in effective leak detection. It is crucial to know the route of a pipe when trying to pin point a leak either by ground microphone or correlation. When a technician is aware of the exact location of the pipe it expedites the leak finding process considerably. Below explains the methods Aqualeak use to trace underground pipes.
For the location of metallic pipes Aqualeak utilises the vLocPro multi frequency line location system. The vLocPro along with the accompanying transmitter generates a radio signal that is transmitted through the pipework which is then picked up by the detector enabling a very accurate identification of the location of underground pipes. For more information on the vLocPro see our product pages.
The detection and localisation of drinking water pipes may prove to be difficult if the pipes are made of non-conducting material, This applies to materials such as asbestos cement, PE and PVC. For the location of non-metalic pipes Aqualeak utilises a number of Sebakmt products to successfully locate underground watermains and household connections.
Sound Pulse Generator (pipe pecker)
A sound pulse generator transmits vibrations along the pipe. Depending on type of material, diameter and type of soil, the sound pulses propagate along the pipe and can be detected on the surface by means of a geophone. In this manner the route of the pipe can be precisely located. The achievable range depends on many factors such as depth, type of soil and pipe material. For more information on the Sound Pulse generator see our product pages.
The PWG location finder system consists of a receiver (Hydrolux 500/5000) and an electronic pulse generator unit named PWG to be bolted to a hydrant or a mains hose. This system enables the operator to easily locate non-metal water pipes in a depth of up to 2m. No additional expensive, sophisticated equipment is necessary, and the particular pipe section does not have to be put out of service for the checking process. The vibrations generated by the PWG have an optimum propagation performance in an even soil structure and surface. Ranges of between 50 m and 600 m can be achieved under good conditions. The location finder system can be applied within and outside urbanized areas and quickly and reliably locates unknown pipe routes. The Hydrolux HL 500/5000 ground-microphones picks up such vibrations – which are strongest directly over the pipe – through ground contact and displays the vibration intensity both in an analogue and in an acoustic way. So the exact position and the route of the pipe can be determined in a speedy and resource-saving way.For more information on the PWG 2000 see our product pages.
GOK A-10/GOK A-50
The location of leaks on PE house services is often made difficult when the route is unknown or in poor acoustic conditions. The GOK A-10 or GOK A-50 is introduced into the house service pipe via an appropriate blocking valve. This is achieved by exposing the pipe and fitting this special blocking valve to it. Because the pig is smaller than the aperture of the fitting and can be pushed into it, there is not as a rule any need for further installation work. Situated in the pig section are a sensitive piezo–electric microphone and a transmitter coil to generate a magnetic field so that it can be located overground with the receiver of the pipe tracing equipment. The pig is pushed into the pipe and the transmitter coil in the pig is activated by switching over at the connection terminal so that the position of the pig and therefore the pipe position can be pin-pointed overground. For more information on the GOK A-10 see our product pages.Back to menu
Water leaks in a domestic house can be located using, either non invasive acoustic listening methods or the Hydrogen Gas Method.
Acoustic Listening involves using the HL 500 or HL 5000 ground microphone to systematically listen to the ground floor slab to hear the hissing sound which is emitted from an underground leak. The position where the sound is the loundest is directly over the leak.
The Gas (H2) Method is based on the injection of a low concentration hydrogen gas into the leakage object. Hydrogen gas penetrates leakages more easily than any other medium. Hydrogen gas rises, and even penetrates materials as dense as concrete or tiles. The actual location of the leak is found with a the HL 500 H2 or the HL 5000H2 gas detector which is especially designed to detect hydrogen only, and is sensitive enough to react to as small a concentration as 0.0001% hydrogen in the air. Locating leaks in buried pipes is done by using a surface probe with the detector.
What about Hydrogen?
Is it really safe? Yes, hydrogen is non-poisonous - we already have plenty of it in our bodies - and is not explosive as long as it is sufficiently diluted. Standard mixtures of 5% hydrogen in nitrogen (Forming Gas) are readily available.
Commercial premises by their nature are usually expansive and therfore underground water leaks may go undetected for some time. The only indication of a leak may be a consistantly high water bill. Our highly skilled team of leak detection engineers can pinpoint water leaks precisely, ensuring that the leak repair can be carried out in the shortest time possible, reducing the cost of the repair to the client and with minimal disruption to the site. Aqualeak utilises various acoustic equipment as well as hydrogen gas tracing along with the very latest in correlating technology.
As part of a site survey, a comprehensive water leak detection & location regime is deployed.
- All mains water supplies are mapped & zones established
- Flow rate & average daily usage is recorded
- Flow & pressure tests are conducted
- Sounding techniques are deployed with acoustic correlation & ground microphones to pinpoint the leak location.
No disruption to the water mains or site operations occurs during the survey. Different techniques are employed to first narrow the search for the leak into a zone then pinpoint the leak, typically to less than half-metre. Some of the techniques employed are described below:
Pipe tracing: Often uses a radio signal transmitted through the pipe network and picked up by detectors to accurately map layout of the water distribution.
Step testing: Water flow is monitored through a flow meter then the gate valve is shut on the pipe network, if the flow significantly reduces the leak is likely to be after the closed valve.
Sounding: Experienced engineers use a ground microphone to listen for variations in sound through the pipe network. If a noise is located, the source of this noise can be traced to the location of the leak.
Correlation: Correlators are two transmitters or accelerometers that measure the time difference between two points, from the mechanical vibration the water leak makes as it leaves the pipe and the time or the velocity of the pipe for the noise to be heard at each correlation unit. These vibrations travel through the pipe wall (as minute vibrations) and in the water column (as a pressure wave).The software then produces a line correlation graph which shows the distance from the sensor to the leak.Correlation is particularly good at detecting multiple leaks in a pipe network.Back to menu
What is a Water Audit?
A water audit can identify genuine use and needless waste. The result – leaks and wastage identified, less water used, less money spent!
A comprehensive water audit will uncover any costly inefficiencies in the water distribution system that results in money literally going to waste.
The water audit will usually start with a Desktop study which will look at bills, collate information relating to the bills including consumption, metering, waste water costs, tariffs, surface water charges, standing and fixed charges.
Following on from this will be a site survey reviewing the physical use and distribution of water.
This is an unobtrusive exercise that locates leaks, verifies the potential savings identified in the desk study and identifies all other opportunities for savings. This activity includes flow and pressure monitoring, infrastructure verification, control valve status and operation.
Techniques for breaking down and checking large sites include step, transfer and drop tests, prior to undertaking top sounding and real time multi-point correlation.
The result is a range of detailed reports and direct advice on how to improve effective water use.
This can result in leak detection & repair, installation of automated meter readings, installation of water conservation products or rainwater harvesting.
We can provide recommendations for waste water recycling and private boreholes with a water treatment plant.
The bottom line of a water audit is to save you money!Back to menu
Aqualeak utilises the very lastest technology in ultrasound flow measuring to accurately measure flow in existing piplelines for clients. The UDM 200 is a light, portable ultrasound flow measuring device for precise flow measurements in pipes.
The measurement is carried out from the outside wall of the pipe and without direct contact with the water column. There is no need to enter the piping system or to interrupt the supply.
Transducers located on the outside of an existing pipe constitute a sensor for finding out the time interval between transmission of an ultrasonic signal and its reception which is variable with the flow rate. Fitted with the standard sensor it can make a flow measurement for pipes with a diameter ranging from 25mm to 1000mm.
Using the UDM 200 Aqualeak can accurately specify pumps, check flow meters or zero-consumption measurements carried out in pipe sections. Portable ultrasound flow measuring devices can be used in carrying out step testing on piplines where there are no meters installed.
Our experienced pressure testing technicians can undertake all types of pressure testing for all types of pipelines from Steel PVC, Ductile Iron to Polyethylene. Mains water pressure needs to be tested prior to the installation of any kind of water treatment system in order to test for any irregularities in pressure that may affect the operation of the filtration equipment. The pressurisation of the water pipeline is done using a pump which has been specifically purpose designed. Pressure loggers are used on mains, which can be downloaded and analysed on site.
Fire Hydrant testing
Aqualeak also offer a fire hydrant testing service to its client which includes:
- Carry out visual inspection including recording GPS location
- Connect flow meter and record flow
- Connect pressure gauge and record water pressure
- Prepare detailed report on the findings
Using the Sebalog D wireless data logger Aqualeak can offer a complete telemetry system. Sebalog D data loggers can be used to cost effectively monitor DMA's of all sizes, monitoring flow , pressure, turbidity, reservoir levels, clorine & ammonia levels, open channel flow, borehole levels and any other devices with 4-20mA outputs. The loggers can be programmed to output data every 1sec to every 24hours.
Sebalog D is an advanced wireless data logger system which is ideally suited to todays water industry. It is ideal for monitoring flow and pressure to assess demand, leakage and conformance. The Sebalog D range consists of single, two and four channel data loggers.
The Sebalog D is available in several configurations with various internal sensors and input channels. The data is communicated via wireless communication (radio range up to 20m and more) using a hand held readerbox. The data can then be downloaded to a PC where it can be analysed.
Alterternatively the Sebalog D is available with an Integrated quad-band GSM / GPRS modem to transmit data over a long distance. Data is provided via FTP to integrate the data easily into existing telemetry systems. Each channel has individual alarm thresholds. Once this threshold is reach the logger sends a SMS, email and message to the telemetry system.
Advantages at a glance:
- Wireless programming and read out
- Fast USB interface
- Large memory for long logging cycles
- Integrated pressure sensor (optional)
- External display to Operate logger (ReaderBox) (optional)
- Logging Not interrupted during read out process
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