Boreline retrieval procedure using a crane
Stop the pump. If a 6mm (ΒΌ") hole has been drilled into the check valve allow the water to drain down to the static water level - allow 30 seconds per metre (10 seconds per foot ). If a Break-Off Plug has been installed open the access port in the wellhead and drop the anvil tube to fracture the plug - when the water level drops allow 30 seconds per metre (10 seconds per foot) to completely drain down - meanwhile, recover the anvil tube using the attached cord.
Disconnect the electrical supply and discharge pipe-work.
Lift the headplate off the borehole using the crane and slings to approximately 3m (10 ft) above the well head. Clamp the riser using a Boreline clamp at the wellhead level. Lower the riser to allow the clamp to take the full load. Lower the headplate to the ground and remove it from the riser. Do not clamp the cable.
Once the headplate has been removed the Boreline can be drawn from the borehole to the maximum height allowed by the crane and clamped, again, using the other clamp at the well head.
This procedure is repeated until the pump is lifted clear of the borehole.
Please note. If the Boreline and pump have to be removed while full of water the column will be heavier than normal. In this case make sure to allow for the extra weight when using lifting devices and vehicles.
See full specification table, above, for nominal weights of the Boreline and water column per metre. The addition of pump, cable and accessories weights will give the total weight of the column to be lifted.