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In this picture you can see a temporary cover erected to cover the pond to protect the excavation from the worst of the weather. It is hoped that the cover will also allow extended working time during the cold weather and allow the fibre-glassing to take place (with the aid of heating) during winter. The cover is simply a number of tarpaulins fixed to the already constructed pergola (with a modified, temporary roof). |
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Due to the length of the pipe runs and the fact that most pipe work will be buried underground and inaccessible pressure pipe has been selected for the installation.
The long pipe runs also dictate that 50mm (2”) pipe work is to be used throughout to avoid a too significant loss of flow-rate through the system.
NOTE. When sizing pipe it should be borne in mind that pipe size is measured externally and therefore 40mm pressure pipe has a narrower bore internally that solvent weld at 40mm due to the walls of pressure pipe being thicker. |
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Although more expensive than solvent weld pipe, there are suppliers that will supply quantities of industrial quality pipe work at very favourable prices. Additionally, specialist suppliers will supply pipe lengths of 5 or 6 metres with flanged ends which reduces the number of joins required (the ends can be seen in the photographs). The number of fittings obtained so far and shown in these photographs is around 60% of the estimated amount required to finish the build. |
Swept bends have been selected for all pipe returns and some knuckle bends selected for areas where space will be at a premium in the filter house. A number of ball valves and unions have been purchased to allow equipment to be removed without cutting pipes in the future.
NOTE. Solvent cement used for welding pipes together comes in more than one ‘flavour’ and it is important to select the correct cement for the pipe used. Cement used for bonding ABS Solvent Weld pipework should not be used to bond pressure-pipe and vice versa. |
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During excavation it was noted that the water table sat at approximately 7” above the base of the excavation. In order to keep the excavation dry a hole was dug outside the perimeter of the pond approximately 12” deep and 10” diameter. Into this was place a ‘foul-water’ pump surrounded by gravel which ran 24 hours a day to temporarily lower the water table and allow work to continue. This pump will remain in place until the fibre-glassing has been completed at which point it can be removed and the area backfilled with concrete. |
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