It is widely known that a significant proportion of East Anglia relies for its existence on the effective operation of widespread land drainage networks. Without these networks much of the region would not be able to function in the way that it does and the population would be hard pressed to continue their lifestyles in the way they do in the modern world due to the high ground water levels.
Much of the drainage to keep ground water levels in check is achieved using local pumping stations that take water from the land drainage network and pump it into local rivers and drainage channels that remove the water off the land and out to sea so keeping the local area from flooding. These pumping stations are under the control of the Internal Drainage Boards (IDB’s).
However, when undertaking rehabilitation of a pumping station at a site near Kings Lynn, a reverse syphon carrying water from the pump station to the main drainage channels that fed the local estuary, was found to have failed and there were fears that water normally carried by the syphon away from its local pumping station would cause problems.
The failure of the syphon meant that water from the pumping station was not, as would normally be the case, all removed from the network but that it was being returned back into and potentially undermining the pumping station due to leakage in the syphon. This was also causing the river bank near the pumping station to erode. It was causing problems in the pump station as water was recycling, meaning the pump station was working significantly harder than it should, incurring extra cost and potentially could lead to significant flooding problems for the area. Read More
Marlborough College in Wiltshire, UK is a highly respected independent school for day and boarding pupils. The College was established in 1843 by a group of Church of England clergymen. Today the College is a fully co-educational establishment catering for about 930 pupils with the great majority (98%) being boarders. The Duchess of Cambridge is a former pupil.
Of the full boarding schools across the country, Marlborough was recently ranked 4th with an 82% acceptance rate for pupils to the UK’s top 30 universities, a rating bettered only by Westminster School, St Paul’s School and Winchester College.
As with all buildings that have been in use for some considerable time, Marlborough College’s infrastructure is constantly reviewed and repaired or upgraded as necessary.
Recently part of this ongoing process there was a need for the renovation of a significant part of the College’s North Block including the building’s rainwater drainage system. The system comprises very old and ornate cast iron rain water downpipes that in places are hidden within the fabric of the wall and which take rainwater from the roof to ground level drains. In places these downpipes were leaking causing damp problems within the building. Given their design, location and accessibility they would have been very difficult to replace in keeping with the original building construction so an alternative to full replacement was sought. Read More
The problem was that some 5 years ago pipeline survey works highlighted that ground movement has caused deterioration and cracking in sewers the vicinity of the cathedral, with the situation being carefully monitored by DALROD since. A more recent survey indicated that the sewers were now in need of relining, which is normally a straightforward procedure for the DALROD team. However, in this instance, one particular 225 mm (9 in) diameter sewer system, which was approximately 2.8 to 3.0 metres deep, had particularly difficult access problems. The access was tricky for various reasons including that the pipeline runs below a terrace of pre-war-built houses with no rodable access points from most of the lateral connections as well as poor access to most of the gardens of each individual property which made it difficult to reopen the lateral connections subsequent to the main line lining work. In addition to the access difficulties, most of the properties comprised 3-storey buildings that had live systems which could not be shut down adding to the general operational difficulties. All of this meant that Dal Rod had to reline the sewers whilst the system was live and over-pump where flows required it to make sure that no flooding occurred in the basements of any of the 3-storey buildings during the works. This was clearly a case for a trenchless lining or 'no-dig' solution. Having examined the options it was decided that Brawoliner was best suited to the work, a system which the DALROD team had previously utilised on similar jobs. Read More
AES Kilroot Power Station (KPS), near Carrickfergus, some 12 miles northeast of Belfast, is an oil and coal burning power station that produces around one third of Northern Ireland’s electricity. Being such an important power generator for the area, however, the current facility must be kept at its best efficiency and operational performance at all times.
As part of the ongoing maintenance work to ensure this performance is achieved, a CCTV survey of the existing 420 mm diameter, steel, sea water pipelines which have been in use for over 30 years was undertaken.
The survey showed signs of severe encrustation and corrosion, with, in places, up to 30% of the pipe cross section being obstructed. Corrosion had also removed a length of approximately 7.0 m in the invert of one pipe and there were also numerous small holes throughout the length of the pipes which allowed the ingress of water in the form of jets and seepage. Read More
Available online or direct from Sewer Centre, the PatchBox™ kit comprises an application system for 100 mm and 150 mm diameter pipes including (to order): a Glass Fibre mat cut to the customers specification and size; the appropriate resin requirements in two separate storage bottles; a 100/150mm by 1.5 m Sava lateral inflatable Packer; a Locking inflation coupling; a Heavy duty eye bolt and stainless steel extension with brass adapter to connect to drain rods; a Heavy duty hand pump; an Inflation Controller complete with safety valve and fail safe regulator; a 30 m inflation hose with locking self sealing couplings; and a Check Gauge to monitor pressure in the Packer whilst the repair is curing. Read More