This paper describes two new measurement techniques that are in use in the United Kingdom to help make
informed decisions about the need for maintenance of water mains to improve conveyed water quality
to customers. The first technique involves the use of a new
instrument, the "Trunk Mains Sampler", which has been designed to sample deposits from
inside trunk mains, under pressure, without interruptions to supply or causing discolored
water problems to customers. The purpose of the sampler is to provide objective
measurements of deposits, from which it is possible, together with additional information
such as conveyed water quality, to ascertain priorities for trunk mains rehabilitation, typically
for mains greater than 6". A camera, which can also be inserted into trunk mains under
pressure, has been developed and used to provide visual confirmation of the presence of
sediment and the condition of the trunk mains. A description of the development work, the
operation of the sampler and the interpretation of the results is given. Case studies of recent
applications of the sampler to determine mains rehabilitation requirements are also provided.
The paper also describes a sampling method and results from a project aimed at
establishing the factors affecting the build-up of sediment in small diameter distribution
mains. The objective of the project was to establish ground rules and trends to predict the risk
of deposit build-up within distribution systems to help target maintenance flushing of small
diameter mains, and swabbing of larger diameter mains.
Includes tables, figures, appendix.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 530 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 12 |
| Published : | 11/01/2002 |
