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Slotted Pipes, Casing Pipes and Screens

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Slotted Pipes, Casing Pipes and Screens

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Slotted Pipes, Casing Pipes and Screens

Discharge in Litres/minute  Calculated Weight (Plain end)
Minimum Recommended
Up to 475 100 100
475-1125 150 150
1300-3000 200 250
3000-5250 250 300
5250-9500 300 350
9500-13300 350 400
13300-19000 400 450
19000-26500 450 500
26500-34000 500 550
 
Selection Off Screen Diameters
The designed yield of a tube well is 150m²/h (1.5 Cusecs) and a screen having 20% open area is proposed to be used in a length of 20m to tap an acquifer of 25m thick. Diameter, of the screen is to be worked out.
As Q = A x V

Where Q = discharge in m²/s, A = effective open area of the screen 
V = entrance velocity in m/s (to be ltd. to 0.03 m/s) 

Therefore, A = 150/3600 x 1/0.03 = 1.39m² 
Taking effective area as 50% of that provided, in order to taking into account the reduction of the effective area of the screen opening with time due to incrustation rearrangement of the acquifer particles around the screen and coverage by gravel, etc.
The required open area = 2 x 1.39 = 2.78m² 
Open area of pipes = x d x l x open area 
Where d = dia of pipe, l = length of pipe
Therfore, d = 2.78/ x 20 x 20 = 0.22m or 220mm 

The required sceen dia works out 220mm. 

Selection of Slot Size
Acquifer Material Classification - The acqifer material may be classified into various categories according to the following ranges of the particle size:

Fine Gravel
- above 2.0 mm
Coarse Sand 0.5 - 2.0 mm
Medium Sand 0.25 - 0.5 mm
Fine Sand 0.05 - 0.25 mm
Silt 0.002 - 0.06 mm
Clay below 0.000 mm

ORDERING DETAILS:
Catalogue No Description
JSP-2250 Screens
 
 
Description

Details

Slotted Pipes, Casing Pipes and Screens

Discharge in Litres/minute  Calculated Weight (Plain end)
Minimum Recommended
Up to 475 100 100
475-1125 150 150
1300-3000 200 250
3000-5250 250 300
5250-9500 300 350
9500-13300 350 400
13300-19000 400 450
19000-26500 450 500
26500-34000 500 550
 
Selection Off Screen Diameters
The designed yield of a tube well is 150m²/h (1.5 Cusecs) and a screen having 20% open area is proposed to be used in a length of 20m to tap an acquifer of 25m thick. Diameter, of the screen is to be worked out.
As Q = A x V

Where Q = discharge in m²/s, A = effective open area of the screen 
V = entrance velocity in m/s (to be ltd. to 0.03 m/s) 

Therefore, A = 150/3600 x 1/0.03 = 1.39m² 
Taking effective area as 50% of that provided, in order to taking into account the reduction of the effective area of the screen opening with time due to incrustation rearrangement of the acquifer particles around the screen and coverage by gravel, etc.
The required open area = 2 x 1.39 = 2.78m² 
Open area of pipes = x d x l x open area 
Where d = dia of pipe, l = length of pipe
Therfore, d = 2.78/ x 20 x 20 = 0.22m or 220mm 

The required sceen dia works out 220mm. 

Selection of Slot Size
Acquifer Material Classification - The acqifer material may be classified into various categories according to the following ranges of the particle size:

Fine Gravel
- above 2.0 mm
Coarse Sand 0.5 - 2.0 mm
Medium Sand 0.25 - 0.5 mm
Fine Sand 0.05 - 0.25 mm
Silt 0.002 - 0.06 mm
Clay below 0.000 mm

ORDERING DETAILS:
Catalogue No Description
JSP-2250 Screens
 
 
Additional Information

Additional Information

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