exp5 pump manual

8/2/2019 Exp5 Pump Manual

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Equipment for Engineering Education

Experiment Instruction

G.U.N.T. Gerätebau GmbHP.O. Box 1125

D - 22881 Barsbüttel • Germany

Phone +49 40 670 854 - 0

Fax +49 40 670 854 - 42

HM 150.16 Series/ParallelPump Test



0

Kl.1,6bar

DIN

-1

Kl.1,6

0bar

10

DIN

Kl.1,6

0-1

DIN

bar

Experiment Instructions

Publication-No.: 917.00016A15012 03/97

Please read and follow the instructions before the first installation!

0 3 / 9 7

HM 150.16 Series/Parallel Pump Test

A l l R i g h t s r e s e r v e d G . U . N . T .

G e r ä t e b a u G . m . b . H . ,

B a r s b ü t t e l , G e r m a n y



Table of Contents

1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 Unit description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.1 Unit construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 Unit function and operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.3 Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.4 Care and maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.1 Dangers to life and limb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.2 Risks to the unit and its function . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4.1 Centrifugal pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4.2 Pump characteristic curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4.3 Series configuration of pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.4 Parallel configuration of pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.5 Pump power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.1 Determining volumetric flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.2 Plotting pump characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.2.1 Single pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.2.2 Series configuration of two pumps . . . . . . . . . . . . . . . . . . . 11

5.2.3 Parallel configuration of two pumps . . . . . . . . . . . . . . . . . . 13

5.3 Plot the pump characteristic curves. . . . . . . . . . . . . . . . . . . . . . . . . 15

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G e r ä t e b a u G . m . b . H . ,




6 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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G e r ä t e b a u G . m . b . H . ,




1 Introduction

The HM 150.16 series and parallel configurati-

on of pumps accessory system is used to plot

characteristics of centrifugal pumps. The system

is designed for use in conjunction with the HM 150

fluid mechanics base module, but can also be used

independently of it.

Two identical centrifugal pumps are available,

interconnected by a pipe system. Built-in stop-

cocks allow operation of the pumps in series andparallel configuration. Manometers indicate the

pressures at all key points in the pipe system. In

conjunction with a volumetric flowmeter, pump

characteristics can thereby be plotted.

The system is virtually maintenance-free. As a

result of its robust construction, easily viewable

measuring instruments and prepared didactic ma-

terials, the system is ideal for teaching purposes,

as a demonstration model and for student experi-

mentation.

In conjunction with the HM 150 fluid mechanics base

module, the system covers the following topics:

- Characteristics of centrifugal pumps

- Pump characteristic curves of centrifugal

pumps

- Series and parallel configuration of pumps

- Determining pump power

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A l l r i g h t s r e s e r v e d G . U . N . T .

G e r ä t e b a u G m b

H ,


1 Introduction 1



2 Unit description

0

K l.1, 6bar

DIN

-1

K l.1,6

0

bar

10

DIN

K l .1, 6

0-1

DIN

bar

1

3

2

18

17

8

12

4 13 14 16

Fig. 2.1

1 4 13 14 9 7 11

5 6 15 16 10 17 12 8

Fig. 2.2Unit construction (top view)

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A

l l r i g h t s r e s e r v e d G . U . N . T .

G e r ä t e b a u G m

b H ,


2 Unit description 2



2.1 Unit construction

(Fig. 2.1 and 2.2)1 - Reservoir 11 - Switchbox with main switch2 - Emergency overflow for centrifugal pumps3 - Inflow branch for water supply 12 - Outflow branch4 - Stop-cock pump 1 intake side 13 - Manometer pump 1 intake side

5 - Stop-cock pump 2 intake side 14 - Manometer pump 1 delivery side6 - Stop-cock Connections pipe 15 - Manometer pump 2 intake side7 - Stop-cock pump 1 delivery side 16 - Manometer pump 2 delivery side8 - Stop-cock outflow 17 - Manometer outflow9 - Centrifugal pump 1 18 - Carrying handles10 - Centrifugal pump 2 19 - Drain pipe to slot into outflow branch (not visible)

2.2 Unit function and operation

The HM 150.16 series and parallel configuration

of pumps system is an accessory to the HM 150

fluid mechanics base module, but can be used

independently of it.

The system is fitted with two identical centrifugal

pumps (9, 10), which can be connected via a pipe

system and appropriately configured stop-cocks,

in series or parallel to each other.

A reservoir for water (1) ensures a virtually con-

stant pressure level on the intake side of the

pumps, independent of the water supply.

Manometers indicate the pressures at all key po-

ints in the system.

Flow measurements can be performed using the

HM 150 fluid mechanics base module.

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A



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2.3 Startup

- Mount the system on theHM 150 fluid mecha-

nics base module.

- Connect the water supply:

- Either via an inlet cock of the HM 150

base module on the inflow branch (3)

- or by connecting the mains water to the

inflow branch (3)

- Slot the supplied drain pipe (19) into the outflow

branch (12) and feed it into the collecting tray

of the HM 150 base module.

2.4 Care and maintenance

- Light incursion promotes algae growth, so sto-

re the unit with the reservoir emptied.

- The centrifugal pumps are practically mainten-

ance-free.

- The system should be cleaned from time to

time. Do not use abrasive cleaning agents, in

order to prevent scratching.

3

12

19

Fig. 2.3

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3 Safety

3.1 Dangers to life and limb

- DANGER! Protect the switchbox from

splashing water!

Danger of electric shock.

- DANGER! Before making contact with the

electrical system disconnect the mains plug!Danger of electric shock.

3.2 Risks to the unit and its function

- IMPORTANT! Protect the system from frost!

The pumps or manometers may be destroyed.

- When operating after lengthy downtimes open

and close the stop-cocks several times!

The function of the stop-cocks may be impaired

by liming.

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A l l r i g h t s r e s e r v e d G . U . N . T .

G e r ä t e b a u G m b

H ,


3 Safety 5



4 Theory

4.1 Centrifugal pumps

The mode of operation of centrifugal pumps is

based on the flow principle. A delivery medium

(water) is set in motion by a driven blade wheel (1)

with angled blades, which rotates in a helical hou-

sing (2). The water is accelerated by centrifugal

force and fed into the delivery pipe (3). The out-

pouring of the water creates a negative pressure

(vacuum) at the intake branch (4) and the water

flows through the connected intake pipe. Depen-

ding on the pressure difference to be overcome,

single-stage or multi-stage centrifugal pumps are

used. Centrifugal pumps generate a uniform volu-

metric flow without pressure surges, and conse-

quently are the most common types of pump used

in conveying liquids.

4.2 Pump characteristic curve

The delivered volumetric flow is dependent on the

pressure which the pump has to generate within a

pipe network.

If the required pump pressure is high, the resulting

volumetric flow will be low.

At low pump pressure the volumetric flow is high.

These correlations are represented in the pumpcharacteristic curve (Fig. 4.2), where the pressu-

re difference between intake and delivery side of

the pump ∆p is plotted over the delivered volu-

metric flow V ..

3

1

2

4

Fig. 4.1

Volumetric flow V .

P

u m p p r e s s u r e ∆ p

Fig. 4.2

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4 Theory 6



5 Experiments

5.1 Determining volumetric flow

In all experiments it is necessary to determine the

volumetric flow V .. This can be done with the aid

of the volumetric tank of the HM 150 base

module.

For this, it is advisable to measure the filling time t

for a rise in the water level from 20 to 30 litres

(volume ∆V = 10 litres).

The volumetric flow is produced as

V . =

∆V t

(5.1)

5.2 Plotting pump characteristic curves

Preparing the experiment

- Start up the system as per Chapter 2

- Select the pump configuration:

- Single operation

- In series

- In parallel

Fig. 5.1

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5 Experiments 8



5.2.1 Single pump

The pumps are of identical construction. Pump 1

is used for the experiment:

Performing the experiment

- Connect the stop-cocks as shown in Fig. 5.2

- handle parallel to the pipe - valve closed,

- handle perpendicular to the pipe - valve open

- Switch on pump 1 (9) with the main switch on the

switchbox (11); pump 2 must remain off!

- Set the volumetric flowV .

with the drain cock (8);

ensure continuous water inflow into the reservoir

- Record measured values:

- P Suction on the intake side of the pump (13)

- P Delivery on the delivery side of the pump (14)

- Volumetric flow V .

as per Chapter 5.1 (HM

150)

- Vary volumetric flow V .

and repeat previous measuring

procedure.

4 13 14 9 7 11

5 6 15 16 17 8

Fig. 5.2

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5 Experiments 9



Test : Single Pump

Experiment - Nr.: Date : Komments :

HM150,measured time

in s

Volumetric flow rateV .

in l/s

Suction pressurepSuction in bar

Delivery pressurep Delivery

in bar

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5 Experiments 10



5.2.2 Series configuration of two pumps





- Switch on both pumps (9,10) with the main switch on the

switchbox (11)





- P Suction,1 on the intake side of pump 1 (13)

- P Delivery,1 on the delivery side of the pump 1 (14)


- P Delivery,2 on the delivery side of pump 2 (16),

- volumetric flow V .

as per Chapter 5.1 (HM 150)



procedure.

4 13 14 9 7 11

5 6 15 16 10 17 8

Fig. 5.3 0 3 / 9 7


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5 Experiments 11



Test : Series configuration of two pumps

Experiment-Nr.: Date : Komments :

HM150,measured time

in s

Volumetricflow rate

V .

in l/s

Suctionpressurep1Suction

in bar

Deliverypressurep1Delivery

in bar


in bar

Outflowpressurep2Delivery

in bar

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5 Experiments 12



5.2.3 Parallel configuration of two pumps





- Switch on both pumps (9,10) with the main switch on the

switchbox (11)






- P Delivery,1 on the delivery side of pump 1 (14)


- P Delivery,2 on the delivery side of pump 2 (16),

- POutflow at the outflow (17)

- Volumetric flowV .

as per Chapter 5.1 (HM150)



procedure.

4 13 14 9 7 11

5 6 15 16 10 17 8

Fig. 5.4 0 3 / 9 7


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5 Experiments 13



Test : Parallel configuration of two pumps

Experiment - Nr.: Date : Komments :

HM150,measured

timein s

Volumetricflow rate

V .

in l/s


in bar


in bar


in bar


in bar

DeliverypressurepOutflow

in bar

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5 Experiments 14



5.3 Plot the pump characteristic curves

Evaluating the experiment

Characteristic curves for the pumps can be plotted

from the measured values. A work sheet has been

prepared for this purpose, and is shown in the

Appendix.

For direct comparison it is advisable to plot all three

curves - single pump, series configuration, parallel

configuration- in one graph.

On the vertical axis the pressure difference ∆p

between the intake side and delivery side is plot-

ted:

Single pump: ∆p = p Delivery − p Suction

Series configuration: ∆p = p Delivery ,2 − p Suction ,1

Parallel configuration: ∆p = p Outflow − p Suction ,1.

In series configuration:p Delivery ,1 = p Suction ,2

In parallel configuration:

p Suction ,1 = p Suction ,2 and

p Delivery ,1 = p Delivery ,2 = p Outflow

On the horizontal axis the respective volumetric

flows V .

are plotted.

p Delivery,1 = p Delivery,2

p Suction,1 = p Suction,2

p Outflow p Delivery,2

p Delivery,1 = p Suction,2

p Suction,1

Fig. 5.5

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5 Experiments 15



6 Appendix

6.1 Technical data

Pump

Type: 2 x centrifugal pumpRotational speed: 1450 rpmMax. volumetric flow 40 l/minMax. delivery head 40 m

Delivery medium: Clean water

Power supply: 230V ~ /50Hz

Alternatives optional, see type plate

Power consumption: 2 x 0.4 kW

Manometers

Intake side pump 1: -1 to 1,5 barDelivery side pump 1: 0 - 6 barIntake side pump 2: -1 - 5 bar

Delivery side pump 2: 0 - 6 barOutflow side: 0 - 10 bar

Pipe connections Ø20 and Ø32 mm

Main dimensions

L x W x H: 1100 x 650 x 695 mm

Weight: approx. 50kg

Connected loads: 230V ~ /50Hz

Alternatives optional, see type plate

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6 Appendix 16

exp5 pump manual

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