Borehole drilling, pump lifts and fault diagnosis

Specialist lifting tripod for extactring borehole pumps on steel rising mains.

The rising main can often be replaced with MDPE plastic pipe to eliminate corrosion.

Borehole drilled using stainless steel casing and flange with MDPE rising main.

Borehole raw water analysis – pH 7.15, Iron 654ug/l, Manganese 64ug/l, Turbidity 8.55 NTU, Yield >3500 litres/hour, Skipton, North Yorkshire.

Borehole drilled using stainless steel casing and flange with MDPE rising main.

Borehole raw water analysis – pH 8.1, Iron 125ug/l, Manganese 4.25ug/l, Turbidity 1.6 NTU, Yield >2500 litres/hour. Barnoldswick, Lancashire.

Borehole drilled using stainless steel casing and flange with MDPE rising main.

Borehole raw water analysis – pH 7.8, Iron 1552ug/l, Manganese 152ug/l, Turbidity 6.02 NTU, Yield >3000 litre/hour. Silsden, West Yorkshire.

Borehole pump tripping electrics – fault diagnosis

Insulation breakdown at the well head. Pump extracted and the fault proved to be a heat shrink cable joint allowing ingress of water. The water had tracked up the cable so this was replaced along with a properly installed heat shrink joint. The pump tested ok so was used again. A dip tape was also used to establish the bore depth and static water level. Settle, North Yorkshire.

Poor flow and pressure from borehole pump

The new customer had reported low flow and pressure from their borehole pump. Tests were carried out and either a hole in the pipe or a worn pump was diagnosed. The pump had been in use for 25 years so had served them well. The 1.25″ steel rising main and pump were extracted. A small hole was found in the pipe. A new dry running protected pump, cable and MDPE plastic pipe were installed – all within 3.5 hours. Cowling, North Yorkshire.

Poor flow and pressure from the borehole and high electricity bill – fault diagnosis

The borehole pump would not reach the set pressure to switch off so had probably been running for months non stop. The pump was extracted and the steel rising main was found to have several holes in it. The pump and cable were replaced along with new MDPE pipe to prevent reoccurrence of the problem. Glusburn Moor, North Yorkshire.

No water from borehole – fault diagnosis

Insulation breakdown at the well head. Pump extracted and the fault proved to be the pump itself. There was some insulation breakdown on the cable so this was also replaced. The MDPE pipe was reused. Todmorden, West Yorkshire.

Borehole pump tripping electrics – fault diagnosis

Insulation breakdown at the well head. Pump extracted and the fault proved to be a heat shrink cable joint allowing ingress of water – replaced. The pump and cable tested ok so were used again. Denholme, West Yorkshire.

Borehole pump tripping electrics – fault diagnosis

Insulation breakdown at the well head. Pump extracted and the fault proved to be the cable. New cable and heat shrink cable joint were installed. The pump tested ok so was used again. Barnoldswick, Lancashire.

Borehole drilled using stainless steel casing and flange with MDPE rising main.

Borehole raw water analysis – pH 7.0, Iron 1220ug/l, Manganese 700ug/l, Turbidity 4.6 NTU, Yield >4000 litres/hour. Rossendale, Lancashire.

No water from borehole – fault diagnosis

On arrival the borehole pump was running but no water was been pumped. The pump was extracted and a metal fitting had snapped on top of the pump resulting in the water circulating around the pump and not up the rising main. The snapped fitting was replaced with a plastic type that will not corrode. The pump had been in service for 25 years. With no further problems it was put back into use, to hopefully give years more service. Cragg Vale, Calderdale.

Borehole drilled using stainless steel casing and flange with MDPE rising main.

Borehole raw water analysis – pH 6.6, Iron 2640ug/l, Manganese 298ug/l, Turbidity 18.1 NTU, Yield >3000 litres/hour. Bury, Greater Manchester.

Borehole pump not running – fault diagnosis

The lack of water was due to a capacitor fail in the borehole control box. The capacitor fail had been caused by the pressure vessel having the incorrect air charge. This causes the borehole pump to pulse on and off, creating heat from the capacitor continuously having to charge and discharge. The pressure vessel had the correct air charge added and the pump worked without any problems after this. Note: not all capacitor fails are as obvious as this by appearance. Haworth, West Yorkshire.

Borehole pump not running – fault diagnosis

The lack of water was due to the contacts on the pressure switch burning out. This had been caused by the pressure vessel having lost all of it’s air charge. This causes the borehole pump to pulse on and off. The pressure switch was replaced and it was recommended that the pressure vessel should be replaced. This was changed a few days later. Mytholmroyd, West Yorkshire.