Module 10: Water Pumping Equipment

Question 1

mechanical device used for transferring water from one place to another

Answer 1

water pump

Question 2

the usual source of water of a pump

Answer 2

• lower elevation than the point of delivery
• wells, rivers, lakes, reservoirs, and canals

Question 3

they are essential for good health and sustained agri prod

Answer 3

water pump

Question 4

technical terms in pumping

volume of water pumped per unit of time

Answer 4

discharge

Question 5

technical terms in pumping

form of the energy content of the liquid per unit weight of the liquid

Answer 5

head

Question 6

basic principles in pumping water

Answer 6

1. atmospheric pressure
2. specific gravity
3. centrifugal force

Question 7

2 pump classification

Answer 7

1. positive displacement pump
2. variable displacement pump

Question 8

pump classification

discharges the same volume of water regardless of the head against which they operate

Answer 8

positive displacement pump

Question 9

pump classification

inverse relationship between discharge
rate and pressure head

P = Q up x D down

Answer 9

variable displacement pump

Question 10

type of positive displacement pump

having to-and-from motion

Answer 10

reciprocating pump

Question 11

basic parts of a recipro pump

Answer 11

• piston or plunger
• cylinder
• inlet or admission valve
• outlet or discharge valve

Question 12

2 types of recipro pump

Answer 12

1. lift pump
2. force pump

Question 13

2 types of recipro pump

single-acting pump na may open cylinder, piston with built-in bucker valve.

nili-lift water to flow out from a spout

Answer 13

lift pump

Question 14

2 types of recipro pump

forces the water above atmospheric pressure as distinguished from the lift pump

may single or double acting pump

Answer 14

force pump

Question 15

major parts of a variable displacement pump

Answer 15

1. impeller
2. shaft
3. casing

Question 16

part of a varia disp pump

converts mech energy into fluid energy by the forcig the liquid to move into rotary motion

Answer 16

impeller

Question 17

part of a varia disp pump

it is a wheel or disc mounted on a shaft and meron blades and curved vanes

Answer 17

impeller

Question 18

part of a varia disp pump

transmits power from a prime mover to the impeller

Answer 18

shaft

Question 19

part of a varia disp pump

intro the liquid into the impeller, collects the liquid leaving the impeller and guides it away under an increased pressure

Answer 19

casing

Question 20

types of variable displacement pumps according to hydraulic configurations represented by the arrangement of the impeller and the casing

Answer 20

1. propeller (axial flow) pump
2. mixed flow pump
3. centrifugal (radial) pump

Question 21

types of variable displacement pumps according to hydraulic configurations represented by the arrangement of the impeller and the casing

used for low pressure/head and high discharge

drainage pumping

transfer of water from canals

Answer 21

propeller (axial flow) pump

Question 22

types of variable displacement pumps according to hydraulic configurations represented by the arrangement of the impeller and the casing

combines features of centrifugal and axial flow pumps in which head is developed partly by the centri force and partly by the lift of the vanes

Answer 22

mixed flow pump

Question 23

types of variable displacement pumps according to hydraulic configurations represented by the arrangement of the impeller and the casing

most used for domestic and irrigation purposes

Answer 23

centrifugal (radial flow) pump

Question 24

types of centri pump according to energy conversion

Answer 24

1. volute type (spiral) **reduces velocity
2. diffuser (may diffuser vanes) **small openings

Question 25

types of centri pump according to energy conversionr of stages

Answer 25

1. single stage (single impeller) 2. multi-stage (2 or more impellers in one shaft and casing)

Question 26

types of centri pump according to type of impeller

Answer 26

1. open impeller **small solids 2. semi-open/semi-enclosed impeller **w/ suspended sediments 3. enclosed impeller **for clear water

Question 27

types of centri pump according to type of suction inlet

Answer 27

1. single suction **suction cavity on one side only 2. double suction **both sides meron

Question 28

types of centri pump according to axis of shaft rotation

Answer 28

1. horizontal 2. vertical SHAFT HA

Question 29

types of centri pump according to method of drive

Answer 29

1. direct connected **directly to driver 2. close-coupled **single unit (shaft + bearings and driver) 2. belt driven **may pulley head

Question 30

a criterion that is well accepted in computing the pump capacity is to base it on the ??

Answer 30

highest daily water requirement of the crop

Question 31

according to the National Irrigation Admin. (NIA),, the water req for rice prod is ___mm/day

Answer 31

10 mm/ day

Question 32

this provides an economical installation when an adequate and reliable source of electric power is available at reasonable cost

Answer 32

electric motors

Question 33

_______ should be used when the source of electric power is not reliable or too costly

Answer 33

engine

Question 34

this is the discharge rate of a well per foot drawdown

Answer 34

specific yield of well, SY

Question 35

a low horsepower driven axial flow pump with a capacity of up to 3000 liters per minute.

Answer 35

IRRI axial flow pump

Question 36

ideal for small-farm irrigation where engine-driven pumps are generally too expensive

Answer 36

IRRI "tapat-tapak" pump

Question 37

formula for total drawdown

Answer 37

discharge rate (gpm) / specific yield (gpm/ft drawdown)

Question 38

formula for horsepower needed to drive the pump

Answer 38

hp sub pm = Q x H all over 3960 x Eff sub s