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Flexible Rising Mains for Borehole Pumps

Rising Main

 The advantages of using a flexible riser can be summarised as follows:
  • Oroflex flexible risers have lower frictional losses than equivalent steel tube.
  • Installation/retrieval for service or repair of the pump is carried out in a fraction of the time compared to steel piping.
  • Oroflex hoses do not decay or require specific maintenance being resistant to encrustation.
  • They can be easily installed.
  • Oroflex is unique in that it retains its original bore after pressurisation which allows for the couplings to be re-used.  During use, however, the axial expansion is increased by a further 10% improving flow characteristics. 
Oroflex 40 hose is constructed from polyurethane and re-inforced with high tensile polyester yarns.  

It is WRC approved for potable water and is available in two sizes 1¼" bore and 2" bore, suitable for 4" pumps.  This compact, lightweight hose is available in lengths as long as 1000 metres and is self-supporting, i.e. a cable is not required to carry the pump hose and water column.  A full range of proven hydraulically efficient couplings are available. 

General Data
Technical Data   Oroflex 40 Black Oroflex 40 Grey Oroflex 40 Grey
Bore Diameter mm 32 32 52
Wall Thickness mm 2.2 2.0 2.3
Weight per metre gms 270 240 400
Average Burst Pressure Bar 80 45 30
Max. End Pull Kgs 3450 1200 800
Max. Elongation % 1 1 1
Performance        
Max. Depth of Installation Metres 200 100 100
Max. Working Load Kgs 700 / 1000 350 / 500 240 / 400
Continuous / Intermittent        
Max. Continuous Working Bar 20 10 10
Max. Working Temperature C 50 50 50
PH Range   4-9 4-9 4-9

Oroflex 60 Industrial is designed for use as a flexible well riser, it is remarkably robust, totally dependable and attractively priced.  

Oroflex 60 constructed from a special nitrovinyl rubber and is reinforced with 2 high tensile polyester jackets.  Polyurethane based materials are used for potable water applications.

Proven over ten years the unique non-twisting design eliminates torque twist at pump start up also vibration.  A complete range of fittings and accessories (2"-6") compliments these hoses which are now widely used in agriculture and by the utility companies and for specialist de-watering projects.

 Oroflex
Technical Data - Oroflex 60
Bore Size   2" 3" 4" 5" 6"
Wall thickness mm 4.5 5.0 5.2 5.5 5.8
Weight per metre kg 0.8 1.3 1.8 2.4 2.8
Average burst pressure Bar 105 105 60 50 50
Working pressure Bar 30 30 25 21 21
Max. end load on upper coupling kg 1200 2300 3600 4200 5000
Operating temperature °C 50 50 50 50 50
PH Value   4-9 4-9 4-9 4-9 4-9
Maximum volume L/m 355 755 1355 2095 3005
m³/hr 21 45 81 126 180
L/s 5.9 12.6 22.6 34.9 50.1

To achieve optimum performance a velocity of 2.5 metres/second is advised.
Speeds greater than this cause a greater load loss.

Deep Wells

For deep wells where the depth is greater than 200 metres, lengths of Oroflex 60 2" & 3" can be joined using a double taper joiner or two BSP connectors joined with a BSP socket.
Centering Device

Vertical wells should be the norm but this can never be guaranteed and to avoid the possibility of the hose chafing against the well/lining, centering devices can be installed near the pump and then at 50 metre intervals up the riser.

 Centering Device

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