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:

  • Head and Handle assembly.
  • Pedestal assembly.
  • Riser pipe 3M long (Top one is separate from other pipes)
  • Hollow Pvc connecting (Pump) rods, 3M long (makes the pumping action easy due to buoyancy effect)
  • Top pump rod 1 M long (special attachment for connecting with handle)
  • Pistion Rod 1 M long (pistion assembly is attached to this rod)
  • Cylinder pipe along with foot valve arrangement.
  • Upper casing (80 mm dia), lower casing (40mm dia), Reducer, Screen pipe, Sand trap assembly etc.

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

ItemNominal

dia

Outside diaWall Thickness

Length

MinMaxMinMax
Upper Casing808088.34.04.63000 + 10
Rising Main506060.22.53.03000 + 10
Lower Casing404848.23.54.03000 + 10
Top Pump Road324242.22.22.71000 + 10
Pump Road324242.22.22.73000 + 10
Sand Trap404848.23.54.01040 + 10
Piston Rod324242.22.22.71000 + 10
Cylinder Pipe506060.22.53.03000 + 10

LIST OF COMPONENTS FOR ONE SET DIRECT ACTION HAND PUMPS

S.NOITEM   DETAILSNo required for well depth

15 Mtr30 Mtr40 Mtr
1Pump Head Assembly111
2Handle Assembly111
3Stand Assembly111
4Pump Rod235
5Pump Rod Top111
6Piston Rod & Piston Assembly111
7Cylinder & Foot Valve Assely.111
8Rising Main124
9Rising Main Top111
10Upper Casing346
11Lower casing156
12Robo Screen.222
13Screen coupler111
14PVC Reducer111
15Sand trap111
16C.I.Cutter Plug.111
17Retrieving Rod111
18Combination Spanner111
19Solvent cement  100 gms150 gms200 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.

InvestigationObservationCorrective Action
1Check discharge of pumpDischarge 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.

2Check efforts needed for pumpingExcessive 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.
3Check working of the  handleHandle 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.

4Check handle surface of the portion where it moves in the Top Guide BushThe portion shows were and tear and signs of corrosionHandle needs to be replaced.  The old handle should be sent for galvanizing..
5Check 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.