WELCOME TO OUR PRESENT

ATION

Presentation On….

Various manually operated pumps used in Bangladesh.

What is pump

A pump is a mechanical appliance used to increase the pressure energy of a liquid, in order to lift it from a lower to a higher level.

Principles of pumping water

Atmospheric pressure

Positive displacement

Centrifugal force

Movement of columns of water caused by the difference in specific gravity.

Manually-operated indigenous water lifts:

Low lift.

Medium lift .

High lift

Low lift

When the depth to water surface does not exceed 1.2 m.

e.g : swing basket, don, Archedian screw, and water wheel

Medium lift

Height of lift is within the range of 1.2 to 10 m.

e.g: persian wheel, chain pump, circular two-bucket lift, counterpoise-bucket lift.

High lift

When the height of lift is greater than 10 m.

e.g: Rope-and-bucket lift, wind powered and water powered water lift.

Swing basket

Two person stand facing each other and swing the basket to fill in water.

The basket is raised and discharge into the field channel.

Optimum lift 0.9 to 1.2 m.

Average discharge 14000-19000 liters/hr.

Don

Manually operated boat-shaped trough, closed at one end and open at the other.

The open end is hinged to the discharge point.

Optimum lift 0.5 to 1 m.

Average discharge 9000-13000 liters/hr.

Archemedian screw

The device is manually operated and consists of a wooden or metal wheel drum with interior partition in the form of a screw, rotated by means of a handle fixed to a central spindle.

Optimum lift 0.5 to 1.2 m.

Average discharge 14000-19000 liters/hr.

Water wheel The water wheel consists of small

paddles mounted radially on a horizontal shaft . The shaft is driven by a b bullock-wheel drive. The wheel, when rotated, pushes the water to the field surface through the trough.

Optimum lift 1 to 1.2 m.

Average discharge 40000-60000 liters/hr.

Persian wheel

The persian wheel consists of a chain and buckets mounted on an open spoked drum and provided with a suitable driving mechanism

The capacity of the bucket ranges from 7 to 14 liters

Optimum lift 5 to 10 m

Average discharge 14000-18000 liters/hr.

Chain pump

The chain pump consists of an endless chain which is provided with leather discs or washers spaced at intervals of about 25 cm. when the wheel is turned each disc brings up a volume of water.

Optimum lift 3 to 6 m.

Average discharge 15000-20000 liters/hr.

Circular two bucket lift

The device uses two buckets which are alternatively raised, emptied, lowered and filed. While one bucket is filled and lifted, the other is lowered empty into the well.

Optimum lift 4 to 5 m.

Average discharge 12000-14000 liters/hr.

Counterpoise-bucket

This device consists of a long wooden pole which is pivoted as a lever on a post. A weight, usually a large stone or a ball of dried mud or a basket full of stones, is fixed to the shorter end of the pole. The bucket is drawn up by the counter-weight.

Optimum lift 1.2 to 4 m.

Average discharge 8000-11000 liters/hr.

Treadle pump

Farmer presses treadles up and down rhythmically with legs

Pistons connected to treadles move up and down in cylinders

Vacuum in cylinders sucks water out of ground

Water flows into irrigation pipe or tank

Pump can move 9.5 gal.(36l) of water per minute

Hand tube-well

A tube well is a type of water well in which a long 100-200(4 to 8 inch) wide stainless steel tube or pipe is bored into an underground aquifer. The lower end is fitted with strainer, and a pump on the top lifts water for irrigation.

Presented by

Md. Sultan Mahmud

ID : 1107048

Shagor Sarkar

ID: 1107051

A. B. M. Hasanul Kabir

ID:1107052

Thank You Everybody