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.
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.
| 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 |
| 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 | 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 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 mmHandle 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. |