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ian@nodigmedia.co.uk
‘one-offs’ it is difficult to see how the water industry could even start to build the depth of knowledge required to operate and maintain and repair the part of the networks that might cause the most problems.
One respondent suggested that it was quite possible that the ‘80:20 rule’ might easily apply here. By this it is meant that by gaining sufficient information on which to base a programme of works ‘fixing the top 20% of the problem areas in a network can result in a saving of some 80% of the costs the network’s problems generate’. Imaging the cost savings over time this would create, at least some of which might be passed on to the consumer but which would also increase profitability for the Water Company and its shareholders. Perhaps this is an approach for senior management to consider given the pressure they are all under to provide the services they offer at less cost and with improved profitability year-on-year.
SITE OPERATIONS
Having looked at the large end of the hardware used in jetting let us now turn our attention towards the ‘business end’ of the configuration. The WRc Sewer Jetting Code of Practice, 2nd Edition offers some very useful information as to the types of equipment and the range of nozzles that might be used for any given
jetting situation as well as suggested values for flow rates of water for removing deposits in various pipe diameters.
It also provides recommended maximum working pressures for the different pipe types likely to be encountered. Much of this however depends on the operator knowing or having a reasonable degree of certainty as to what pipe type he/she will be working with. The Pump pressures indicated range from 1,200 psi to 5,000 psi depending on the materials and state of repair of the pipe. There are some that say operations should start at a relatively low pressure to see if the pipe can be cleaned with this working pressure rising if the blockage does not clear, which seems sensible.
It also recommends that all operators should be sufficiently trained and experienced (but more on that later). With a recommendation that no jetting head should held in one place for more than 60 seconds irrespective of pipe type the guide also
Courtesy of Underground Technical Services
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February 2016 | drain TRADER 11
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