HAND PUMP


“Hari plaast” DIRECT ACTION HAND PUMP


Research and developments have given birth to a new pump i.e. ''Direct Action Hand Pump'' and is covered under IS:14106:1996. It is designed to draw water from bore wells with static water level up to 15 meters. Without any lever action, pumping efforts is applied directly on handle for which it is named as "Direct Action" hand pump. They are cost effective than the deep well hand pumps for medium lifts and are safer bacteriological contamination and corrosion problems.


The Major Components of the pump are:



INSTALLATION


After boring is completed the sand trap with cutter plug, well screen, lower casing, reducing socket and upper well casing is pasted with solvent cement and lowered into the well respectively and fixed to the stand. The cylinder with foot valve assembly and riser main connected are lowered into the upper lower casing. Thie whole assembly rest on the reducing socket jointing the upper and lower casing. The pump rod along with the top pump rod and piston rod with piston assembly are connected together is then lowered into the rising main and is then finally connected to the handle through the pump head.


DIMENSIONS OF DIFFERENT COMPONENTS FOR DIRECT ACTION HAND PUMP


Item

Nominal

    dia
Outside dia

Wall Thickness

Length

    Min Max Min Max  
Upper Casing 80 80  88.3 4.0          4.6         3000 + 10
Rising Main

50

60  60.2    2.5           3.0      3000 + 10
Lower Casing 40 48  48.2    3.5           4.0          3000 + 10
Top Pump Road 32 42 42.2      2.2           2.7   1000 + 10
Pump Road 32 42 42.2       2.2           2.7    3000 + 10
Sand Trap 40 48  48.2          3.5           4.0  1040 + 10
Piston Rod 32 42  42.2 2.2           2.7     1000 + 10
Cylinder Pipe 50 60 60.2      2.5           3.0 3000 + 10

LIST OF COMPONENTS FOR ONE SET DIRECT ACTION HAND PUMPS


S.NO

ITEM   DETAILS

No required for well depth

 

    15 Mtr 30 Mtr 40 Mtr
1 Pump Head Assembly 1 1 1      
2

Handle Assembly

1 1 1        
3 Stand Assembly 1 1         
4 Pump Rod 2 3   5        
5 Pump Rod Top 1 1       1         
6 Piston Rod & Piston Assembly 1 1         1         
7 Cylinder & Foot Valve Assely. 1 1 1        
8 Rising Main 1 2     4        
9 Rising Main Top 1 1 1
10 Upper Casing 3 4 6
11 Lower casing 1 5 6
12 Robo Screen. 2 2 2
13 Screen coupler 1 1 1
14 PVC Reducer 1 1 1
15 Sand trap 1 1 1
16 C.I.Cutter Plug. 1 1 1
17 Retrieving Rod 1 1 1
18 Combination Spanner 1 1 1
19 Solvent cement   100 gms 150 gms 200 gms

CURATIVE MAINTENANCE PROCEDURE FOR DIRECT ACTION HAND PUMP


Curative maintenance is carried out when a malfunction needs correction through replacement or repair of some of the components of the hand pump. The first step is curative maintenance is to identify the reasons for the malfunctioning of the hand pump.


  Investigation Observation Corrective Action
1

Check discharge of pump

Discharge is about one Ltr. Per stroke.

Discharge is less than approx. one Ltr per stroke

Pump does not need repair

There is a problem in the below ground assembly Pump piston, foot valve assembly needs repair.
2

Check efforts needed for pumping

Excessive pumping effort is needed before pump yields water. Check static water level in the tube-well. Hand-pump operates best in areas where water level is within a depth of 45  to 48 M. If water goes below this depth, operation of the hand pump will be difficult due to lesser buoyancy.
3 Check working of the  handle Handle rises gently and smoothly. Play of the handle in the guide bush is more than 5 mm

Handle does not rise on its ownHandle rises very rapidly and with a jerk.

The pump is function normally.

Top guide bush needs replacement.

There it is excessive friction between the handle and the Top Guide Bush . The pump piston needs to be checked.

Indicates a piston related problem.  The cup washer may have worn off and may need change.
4

Check handle surface of the portion where it moves in the Top Guide Bush

The portion shows were and tear and signs of corrosion

Handle needs to be replaced.  The old handle should be sent for galvanizing..

5

Check if there is any dry
stroke.

Water comes out from the first to the fifth stroke.

More than five dry strokes before water comes out.

The Hand-pump is functioning normally.

There is leakage in the below ground assembly, Foot valve, Cylinder and Riser pipe joints need to be checked.



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