Experiment Instructions

HM 365.10 Water Pump Supply

Module
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HM 365.10 WATER PUMP SUPPLY MODULE

All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

Experiment Instructions

Please read and follow the safety regulations

before the first installation!

Publication-no.: 917.000 10 A 365 02 (A) DTP_11

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Table of Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.1 Equipment layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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2.2 Setting Up the Water Pump Supply Module . . . . . . . . . . . . . . . . . . . 5

2.3 Mounting a pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4 Connecting the measurement unit block . . . . . . . . . . . . . . . . . . . . . . 6
2.5 The pumps are to filled using the following steps: . . . . . . . . . . . . . . . 7
2.6 Maintenance/Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.7 Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.7.1 Installing the program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.7.2 Operating the program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1 Health hazards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2 Hazards for Equipment and Function . . . . . . . . . . . . . . . . . . . . . . . 10

4 Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.1 Flow Rate Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2 Head H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Required NPSH Value for a Pump . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 Efficiency of a Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.5 Pump Characteristic Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6 System Characteristic Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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5 Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.1 Recording the pump characteristic curve on the HM 365.11

Centrifugal Pump Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1.1 Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1.2 Experimental method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1.3 Evaluation of the Experiment . . . . . . . . . . . . . . . . . . . . . . . 21
5.1.3.1 Measured data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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5.1.3.2 Calculation of the power required by the Pump at

varying flow rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1.3.3 Hydraulic power output at varying flow rates,
pump efficiency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1.3.4 System characteristic curve and operating point
of the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.1.3.5 Checking the required NPSH value for the pump . . . . . . 26
5.2 Procedure for recording the pump characteristic curve using
the HM 365.10 software, using the example of the HM 365.12
Centrifugal Pump Module with Side Channel Stage . . . . . . . . . . . . 28

6 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

6.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

6.1.1 HM 365.10 Basic Water Pump Module. . . . . . . . . . . . . . . . 31
6.1.2 HM 365.11 Centrifugal Pump Module. . . . . . . . . . . . . . . . . 33
6.1.3 HM 365.12 Centrifugal Pump Module with Side Channel
Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.1.4 HM 365.13 Multistage Centrifugal Pump Module . . . . . . . . 35
6.1.5 HM 365.14 Series / Parallel Pumps Module . . . . . . . . . . . . 36
6.1.6 HM 365.15 Side Channel Pump Module. . . . . . . . . . . . . . . 38
6.1.7 HM 365.16 Lobe Pump Module . . . . . . . . . . . . . . . . . . . . . 39
6.1.8 HM 365.17 Piston Pump Module . . . . . . . . . . . . . . . . . . . . 40
6.1.9 HM 365.18 Gear Pump Module . . . . . . . . . . . . . . . . . . . . . 42
6.1.10 HM 365.19 Vane Pump Module . . . . . . . . . . . . . . . . . . . . . 43
6.2 Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.3 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

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6.4 Items supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

6.5 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
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1 Introduction

The HM 365.10 Water Pump Supply Module is

part of an equipment series that facilitates investi-
gations and experiments on engines and ma-
chines such as pumps, turbines and combustion
engines.

The use of electronic sensors throughout the

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equipment series means that it is possible to use

PC data acquisition. The Water Pump Supply
Module is equipped with such data acquisition.

The Water Pump Supply Module forms the basis

for investigations and experiments on various wa-
ter pumps. The current delivery range includes a
standard Centrifugal Pump Module(HM 365.11),
a Centrifugal Pump Module with Side Channel
Stage (HM 365.12), a Multistage Centrifugal Pump
Module (HM 365.13), an experimental set up with 2
centrifugal pumps for series and parallel operation
(HM 365.14), a Side Channel Pump Module
(HM 365.15), a Lobe Pump Module (HM 365.16), a
Piston Pump Module (HM 365.17), a Gear Pump
Module (HM 365.18) and a Vane Pump Module
(HM 365.19). The Water Pump Supply Module is
equipped with the necessary electronic sensors for
flow rate and temperature measurements. On the
associated measuring unit block there are con-
nections for the pressure sensors that are fitted to
the individual pumps.

The system is suitable for both practical training in

vocational colleges and for laboratory
experiments in technical colleges and
universities. The system is only intended to be
used for training and experimental purposes.

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2 Description

HM 365.10 Apart from the Water Pump Supply Module, a

functional experimental set-up includes at least
one pump (e.g. HM 365.11) and the HM 365 Uni-
HM365.10

P2 P3
versal Drive and Brake Unit. If the experimental
HM 365
5.50
Torque
5.50
Speed
Universal Brems- und Antriebseinheit
Universal Dynamometer Module

set-up is implemented as shown (Figure 2.1), the

experiments can be performed with a closed wa-
ter circuit.
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The Water Pump Supply Module consists of a

laboratory trolley on castors that includes a
HM 365 Pump plastic supply tank and the copper pipework. A
magnetic-inductive flowmeter and a tempera-
ture sensor are integrated into the pipework
Fig. 2.1 Functional Experimental system. The pumps are connected using hoses
Setup
with fittings. The pumps themselves are fitted to
base plates that are simply slid into a pre-pre-
pared mounting and fixed in place there with
clamping fasteners. The pressure sensors for
intake and delivery pressure are fitted to the
pumps. Like the flow rate and temperature sen-
sors, these sensors are connected to the mea-
suring unit block on the Water Pump Supply
Module. The Water Pump Supply Module with
the pump is coupled to the HM 365 Universal
Drive and Brake Unit, which contains the drive
motor for the pump drive. Power is transmitted
between the pump and drive motor using a
V-belt.

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2.1 Equipment layout

1 Laboratory frame
2 Supply tank
10 3 Intake pipe
6 4 Ball cock
15 5 Flowmeter
6 Connecting hose
9 7 Foot valve
5 8 Bypass*
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9 Pump mountings
10 Fittings
4
8
3

7 2

1 * Necessary to show the

behaviour of a self-pri-
ming pump

Fig. 2.3 HM 365.10 Layout

The Water Pump Supply Module consists of a labora-

11 Pipework
tory trolley on castors (1) with supply tank (2) and the
12 Temperature Sensor
pipework (11). The intake pipe (3) is fitted with a foot
13 Air bleed connection
14 Air Bleed Pipe
valve (7) at the lower end. A bypass (8) is used to drain
15 Hand pump the connecting hose (6). The individual pumps are al-
ready fitted to base plates that are placed on matching
11 12 15 mounts (9). After fitting, the pumps are connected to
the ends of the hoses on the experimental set-up using
fittings (10). Use the hand pump to bleed a not
self-priming pump. During the experiments the flow
rate in the water circuit is adjusted using a valve (4) and
measured with a magnetic-inductive flowmeter (5).
Also integrated into the pipework are a temperature
sensor (12) and a connection for an air bleed pipe (13).
The air bleed pipe is formed by a hose (14) with
14 13 self-sealing couplings (HM365.12 only).
Fig. 2.2 Plan View of HM 365.10 A further element of the HM 365.10 is the measur-
ing unit block (Figure 2.4). This is used to display

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the measured data that is provided by the sensors
1 2 3 4 5 fitted to the Water Pump Supply Module and the
pumps. For this purpose, on the front of the unit
are digital displays for temperature (1) in °C, flow
rate (2) in litres per minute, and the intake pres-
sure (3) and delivery pressure (4) of the pump in
bars. In the experimental arrangement for the se-
ries and parallel operation of pumps it is neces-
sary to display a further pressure value and for
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this reason there is a change-over switch (5) for

Fig. 2.4 Front side of measuring unit
block
the display (4). On the rear of the unit (Figure 2.5)
are connections for the sensors (6) and the mains
connection (7). In addition, there is a connection
6 for the HM 365 Water Pump Supply Module (8) so
that the speed and torque data for the drive motor,
as well as the other measured data, can be trans-
ferred to a PC.
HM 365 P3 P2 P 1 Temperature Flow

230V,~50Hz

8 7
Fig. 2.5 Rear side of measuring unit
block

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2.2 Setting Up the Water Pump Supply Module

To set up a functional experimental set-up, the

HM365.10 Water Pump Supply Module must be coupled to
P2 P3

5.50

Torque
5.50
Speed
HM 365
Universal Brems- und Antriebseinheit
Universal Dynamometer Module the HM 365 Universal Drive and Brake Unit as
shown in Fig. 2.6. To do this, the two units are
aligned with each other so that they can be joined
together with the snap-action fasteners. Small
strips welded to the supports make it easier to join
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the units together. After joining the units together,

the supports must be secured against rolling
Fig. 2.6 Setting up the Water
away using the lockable castors.
Pump Supply Module The supply tank is then to be filled with tap water to
approx. 10 cm below the upper edge.

2.3 Mounting a pump

Intake Pipe First a pump must be fitted to the Water Pump
Supply Module. This is achieved by placing the
base plate to which the pump is fitted in the
mounting. The base plate is secured to the
mounting with 2 clamping levers. Prior to securing
the pump, it must first be aligned such that the belt
pulleys on the drive motor and pump are aligned.
The pump can now be connected into the water
Delivery Pipe circuit using the fittings on the hoses. The larger
Fig. 2.7 Hose Connections diameter hose is connected to the intake fitting
(Fig. 2.7 & 2.9). With non-self priming pumps, the
Delivery Fitting Intake Fitting
pump and the hoses must be filled with water the
first time they are installed. The bypass must be
closed to fill the hoses.

Fig. 2.8 Centrifugal Pump (Plan

View):

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2.4 Connecting the measurement unit block

The measuring unit block is placed in the mounting

provided on the HM 365 Universal Drive and
Brake Unit.
The power supply for the measuring unit block is
provided by a mains connector on the rear of the
HM 365. The individual sensors are then con-
nected to the measuring unit block and the con-
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nection made to the Universal Drive and Brake

Unit.

Before the drive motor can be operated, the V-belt

for the transmission of power must be placed
around the belt pulley on the pump. Tensioning the
belt and starting the motor are described in the in-
struction manual for the HM 365.

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2.5 The pumps are to filled using the following steps:

– Connect the pump with intake and outlet

hose to the Water Pump Supply Module.
– Be sure that the intake hose is able to suck
water out the tank.
– Connect the outlet of the hand pump to the in-
take of the pump with the hose.
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– Check the bypass parallel to the foot valve.

The bypass must be closed. Open the valves
Fig. 2.9 Outlet hose, intake hose and in the intake- and outlet-pipes.
filling hose
– Use the hand pump to fill the pipes until water
comes out the outlet hose and flows into the
tank (the volumetric flow measuring unit shows
the flow).

Fig. 2.10 Hand water pump to fill the

pipes for the first time.

2.6 Maintenance/Care

Due to its robust construction, the system is

almost maintenance-free. Nevertheless, the
water in the supply tank should be changed at
regular intervals. Alternatively, the water can be
treated with additives to prevent the growth of
algae. If not used for an extended period, the
entire experimental setup should be completely
drained.

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2.7 Software

2.7.1 Installing the program

The following is needed for the installation:

– An fully operational PC, laptop or notebook
with USB port.
(See Appendix for minimum requirements)
– G.U.N.T. - CD-ROM
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Note! All components necessary to install and run

the program are contained on the CD-ROM, deliv-
ered by G.U.N.T. along with the HM 365.10.
No further aids are necessary!

After starting, the installation runs automatically.

During the course of the installation, various pro-
gram components are loaded onto the PC
– LabVIEW®- runtime program for PC
data acquisition
– Driver routines for the
“LabJack®” USB converter

Installation procedure
Note! Connect nothing to the USB post during the
installation of the program. Only after the software
has been installed can the USB hardware be con-
nected.
– Boot the PC
– Load the G.U.N.T. - HM 365.10 CD-ROM
– Start the installation program “Setup.exe” in
the folder “Installer”.
– Follow the installation procedure on the
screen.

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– Reboot the PC after the installation is fin-

ished.

2.7.2 Operating the program

The program for the PC data acquisition system is

started by selecting:
Start / Programms / G.U.N.T. / HM 365.10
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When the software is run for the first time after in-
stallation, the language to be used for the program
is requested (once only).

Note! The language selected can later be

changed at any time in the menu “Start” un-
der the header “About GUNT”.)

Various pull-down menus are provided for addi-

tional functions.
For detailed instructions on use of the program re-
fer to its Help function. This Help function is ac-
cessed by opening the pull-down menu „?” and
choosing „Help”.

Saved measurement data can be imported into a

spreadsheet application (such as Microsoft Excel)
where it can be edited.

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3 Safety

3.1 Health hazards

DANGER!Protect measuring unit block against

sprayed water! There is a risk of electric shock.

DANGER! Do not touch rotating shafts or moving

belts under the cover! There is a risk of serious in-
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juries.

3.2 Hazards for Equipment and Function

CAUTION!After fitting the V-belt, tension it and

lock the tensioning device! A correctly tensioned
belt can be pressed in 1 to 2 cm. A loose belt is sub-
ject to increased wear and could possibly fly off.

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4 Theory

Reciprocating pump
Reciprocating pumps are positive displacement
pumps, on which a piston (displacer) moving back-
wards and forwards takes in and pumps the liquid.
As gas-free water is practically non-compressible,
high water pressures can arise when the pressure
line is sealed; safety valve required. Reciprocating
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pumps are also suitable for delivering pulpy mas-

ses at low piston speeds.

Rotary pumps
Vane-type rotary pump, vane pump
These machines are suitable for high-speed operati-
on and have chambers or cells that change size con-
tinuously as pump rooms. They have expanding
pump rooms for suction and reducing pump rooms
for pressure. For orbital piston compressors with ro-
tating displacer and non-contact work room sealing,
internal leakage losses limit the permissible com-
pression ratio. There is normally a safety valve on
Fig. 4.1 Principle Rotary the pressure side of the pump.
compressor
Attention! Note direction of rotation.

Other rotary pumps include:

Gear pump, propeller pump,

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Centrifugal pump
Centrifugal pumps are machines for the delivery of
liquids and liquid/gas or liquid/solid mixtures. By
taking up mechanical work, which is supplied by an
engine (drive), they increase the energy of the
pumped medium, which primarily increases the
pressure and, to some extent, also the speed and
geodesic level of the liquid between the pump inlet
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and outlet. The temperature increase in the pump

is imperceptibly low. The energy is transmitted by
one or more impellers, which the medium flows
through from the inside to the outside

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4.1 Flow Rate Q

The flow rate Q is the useable volumetric flow rate

pumped by the pump through its outlet cross-section
(delivery fitting). The unit is normally m3/h.

4.2 Head H

The head H of a pump is the mechanical work trans-

ferred by the pump to the medium pumped, based on
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the weight of the medium pumped under local gravity

conditions. The head H is measured as the increase
in the useable mechanical energy E of the medium
pumped between the inlet and outlet of the pump, ba-
sed on the weight G of the medium pumped. The unit
for the head is the metre. Despite this unit, the head
must never be taken to signify a length, e.g. the length
of a column of liquid. It consists of:

zD-zS (Difference in level of inlet and

outlet cross-section of the pump)
pD - p S
(Difference in pump head of pumped
r ×g
medium between inlet and outlet)
V ×V
D
2 2
S
(Difference in speed level of pumped
2 ×g
medium between inlet and outlet

These yield the head for a pump as

pD - p S VD2 -VS2
H = zD -z S + + (4.1)
r ×g 2 ×g

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4.3 Required NPSH Value for a Pump

The term „NPSH value“ is used in relation to the

cavitation that can only be permitted to a very limit-
ed degree in centrifugal pumps. NPSH is an abbre-
viation for Net Positive Suction Head. To prevent
or limit cavitation in centrifugal pumps, at the im-
peller there must be a static overpressure above
the vapour pressure of the medium pumped.
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The necessary NPSH value for a pump, NPSHreq

defines how high the total pressure head in the re-
ference plane for the NPSH value must be, as a mi-
nimum, above the vapour pressure head of the
medium pumped to ensure correct operation of the
pump. As the calculation of the NPSH value is rela-
tively time consuming, it is generally provided by
the pump manufacturer. The unit is the metre. For
correct operation of a pump, the existing NPSH va-
lue of a system, NPSHexist must be greater than
the NPSH value required for the pump.

NPSHvorh ³ NPSH erf (4.2)

The existing NPSH value for a system can be cal-

culated very easily. If, due to system-specific rea-
sons, it is unavoidable that a pump is operated
near the cavitation limit, tough materials should be
selected for the components at risk (e.g. Cr, CrNi,
CrNiMo steel castings).

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4.4 Efficiency of a Pump

The pump efficiency his given by the ratio between

the power output by a pump and the power drawn
from the shaft, i.e.:

r × g ×Q ×H
h= (4.3)
Pmech

As r × g ×Q ×Hcorresponds to the hydraulic power out-

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put of the pump, the equation can also be expressed

as:

Phydr
h= (4.4)
Pmech

4.5 Pump Characteristic Curve

On a centrifugal pump driven at constant

speed, the head H, the power required P
(and thus the efficiency h), as well as the pa-
rameter NSPHreq depend on the flow rate Q.
The relationship between these items of per-
formance data is displayed in characteristic
curves. Fig. 4.1 shows, as an example, the
four characteristic curves for a single stage
centrifugal pump at the speed n = 1450 rpm.
These characteristic curves characterise the
operating behaviour of each centrifugal
pump.

Fig. 4.2 Pump Characteristic Curves

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4.6 System Characteristic Curve

The system characteristic curve is given by

the pressure losses in the pipes at a specific
flow rate. For increasing speeds (=increasing
H
flow rate), there exist points in a graph of
head H against flow rate Q using which the
Pump Characteristic Curve
system characteristic curve can be drawn.
The operating point of a pump is positioned,
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as shown in Fig. 4.2, where the heads for the

pump and system are the same, that is at the
point where the system characteristic curve
and pump characteristic curve cross.
System Characteristic Q
Curve

Fig. 4.3 Operating Point of a Pump

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5 Experiments

The selection of experiments makes no claims of

completeness but is intended to be used as a stim-
ulus for your own experiments.
The results shown are intended as a guide only.
Depending on the construction of the individual
components, experimental skills and environmen-
tal conditions, deviations may occur in the experi-
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ments. Nevertheless, the laws can be clearly dem-

onstrated.

The experiments on the individual pumps can be

performed with or without PC data acquisition. As
an example, a series of experiments is demon-
strated on the HM 365.11 Centrifugal Pump Mod-
ule without PC data acquisition, and on the
HM 365.12 Centrifugal Pump Module with Side
Channel Stage a series of experiments with PC
data acquisition is described.

5.1 Recording the pump characteristic curve on the HM 365.11 Centrifugal

Pump Module

5.1.1 Preparation

To obtain clear experimental results, series of

measurements at various speeds must be perfor-
med on the pumps. To be able to take a measure-
ment point, the pump must be running at constant
speed and the system must be more or less in a
steady state. The preparations necessary for the
measurements are described briefly at this point:
– The bled pump must be fully connected
– The belt guard must be in place on the
HM 365 Universal Drive and Brake Unit, the
direction of rotation indicator „clockwise rota-

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HM 365.10 WATER PUMP SUPPLY MODULE

tion“ must be illuminated, the controller for

the DC motor and the master switch must be
switched on
– The motor only starts to rotate when the
speed potentiometer is moved
– The pump can only start with back-pressure,
i.e. the ball cock for flow rate regulation must
be closed
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

– First set the speed to around 1000 rpm, care-

fully open the ball cock and observe whether
water is already being pumped back into the
tank
– In there is a flow, the required speed can be
set on the potentiometer, and the required
flow rate on the ball cock
– When changing the flow rate by opening or
closing the ball cock, the speed of the pump
must be readjusted using the potentiometer
–
5.1.2 Experimental method

Once the pump to be investigated has been in ope-

ration for some time and has reached its operating
temperature, the process of taking measurements
can be started. At the start of the experiment, the
ball cock for regulating the pump flow rate should
be fully open.
During the series of experiments the ball cock is clo-
sed a little for each point measured. The speed n is a
constant 2900 rpm . In this and the following experi-
ments, the volumetric flow rate is determined exclu-
sively using the magnetic-inductive flowmeter. It is
displayed on the measuring unit block in l/min. Table
5.1 shows which relevant measured values are to be
recorded.

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HM 365.10 WATER PUMP SUPPLY MODULE

Q in ltr/min p1 in bar p2 in bar M in Nm

243,3 -0,24 0,70 3,75

200,1 -0,18 0,98 3,61

153,0 -0,13 1,23 3,43

102,5 -0,09 1,45 3,15

52,0 -0,07 1,61 2,81

0 0,01 1,86 2,48

All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

Tab. 5.1 Measuring series at n = 2900 rpm

These are the flow rate (Q) intake pressure (p1)

and delivery pressure (p2) for the pump, displayed
on the measuring unit block of the HM 365.10. In
addition, the series of measurements provides the
pump load, displayed as the torque on the display
of the HM 365 Universal Drive and Brake Unit. The
following characteristic curves can be derived from
these values:

– Head H against flow rate Q

– Efficiency h against flow rate Q
– Power requirement P against flow rate Q

During this process the head can be calculated

from the data on the intake and delivery pressure.
The flow speeds at the inlet and outlet cross-sec-
tions of the pump necessary for the calculation of
the heads can be derived from the flow rate, if the
pipe diameter is known.
The values for the mechanical power of the pump
(= power required Pmech) necessary to calculate
the efficiency can be calculated from the torque M
displayed:

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HM 365.10 WATER PUMP SUPPLY MODULE

Pmech = M ×w or

Pmech = M × 2 × p × n (5.1)

To calculate the hydraulic power output, refer to

the equations 4.3 and 4.4. The measurements are
performed at varying speeds.
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

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HM 365.10 WATER PUMP SUPPLY MODULE

5.1.3 Evaluation of the Experiment

5.1.3.1 Measured data

Q in m3/h H in m M in Nm

14,58 9,4 3,75

12,00 11,6 3,61

9,18 13,6 3,43

All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

6,15 15,4 3,15

3,15 16,8 2,81

Tab. 5.2 Measured Data Recorded at n = 2900 rpm

Single stage centrifugal pumps represent an eco-

nomical to manufacture basic model for drainage
and watering in a very wide range of applications.
For the pump to be able to commence operation, it
must draw in a column of liquid.
The measured data from Table 5.1 is re-organised for
the evaluation. Q is now given in cubic metres per
hour, the head is calculated from the pressure diffe-
rence at the pump. The density of water is defined as
1 kg/litre, for acceleration due to gravity g, 9.81 m/s2 is
used.

5.1.3.2 Calculation of the power required by the Pump at varying flow rates

Using equation 5.1, Pmech for a flow rate of

14.58 m3/h is:

Pmech = 3,75 Nm × 2 × p × 48,3 s -1 = 1138 W

The values for all the flow rates measured are

given in Table 5.3.

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HM 365.10 WATER PUMP SUPPLY MODULE

Q in m3/h Pmech in W

14,58 1138

12,00 1096

9,18 1041

6,15 956

3,15 853

Tab. 5.3 Power required at n = 2900 rpm

All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

Plotted on a graph, a curve as per Fig. 5.4 is produ-

ced.

1,2
1
0,8
0,6
0,4
0,2
0
0 5 10 15 20

Fig. 5.1 Power required by the pump at n = 2900 rpm

5.1.3.3 Hydraulic power output at varying flow rates, pump efficiency

Using equations 4.3 and 4.4, the hydraulic power

output of a pump can be calculated for varying flow
rates and heads, here for example for a flow rate of
14.58 m3/h at a head of 9.4 m:

14,58m 3 kg dm 3 m kg m 2
Phydr = × 9,4m × 1 3 × 1000 3 × 9,81 2 = 373,5 = 373,5 W
3600s dm m s s3

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HM 365.10 WATER PUMP SUPPLY MODULE

The hydraulic power output for the measured values

is given in Table 5.5.

Q in m3/h H in m Phydrin W

14,58 9,4 373,5

12,00 11,6 379,3

9,18 13,6 340.2

6,15 15,4 258,1

All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

3,15 16,8 144,2

0 18,5 0

Tab. 5.4 Hydraulic power output of pump at n=2900 rpm

If the power required by the pump and its hydraulic

power output are known, the pump efficiency can
be calculated using equation 4.4, here for example
for a flow rate of 14.58 m3/h:

Phydr 373,5 W
h= = × 100% = 32,82%
Pmech 1138 W

The results for the entire series of measurements

are given in Table 5.5. The efficiency can be plot-
ted against the flow rate. The curve is shown in
Figure 5.2.

Q in m3/h h

14,58 32,82
40 12,00 34,60
35
30
25 9,18 32,68
20
15
10
6,15 27,00
5
0 3,15 16,90
0 5 10 15 20

0 0

Tab. 5.5 Efficiency of pump at n = 2900 rpm

Fig. 5.2 Efficiency of pump at
n = 2900 rpm

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HM 365.10 WATER PUMP SUPPLY MODULE

5.1.3.4 System characteristic curve and operating point of the pump

If the head of a pump is plotted against its flow rate

at constant speed, the characteristic curve of the
pump at the selected speed is obtained. If the
heads of the pump at various speeds are plotted
against the maximum flow rate, the system charac-
teristic curve is obtained. The intersection between
the pump characteristic curve and the system
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

characteristic curve provides the operating point of

the pump at the chosen speed. As an example, in
Table 5.6 the pairs of values for the construction of a
system characteristic curve are given, in Table 5.7
the data for the pump characteristic curve at a
speed of 2900rpm. If both curves are plotted on a
graph, the operating point of the pump is obtained
as shown in Fig. 5.3.

n in rpm Q in m3/h H

1450 7,18 2,43

2000 10,54 4,91

2600 13,01 7,56

2750 13,82 8,47

Tab. 5.6 Measured values for system characteristic

curve

Q in m3/h H in m

14,58 9,4

12,00 11,6

9,18 13,6

6,15 15,4

3,15 16,8

Tab. 5.7 Pump characteristic curve for n = 2900 rpm

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HM 365.10 WATER PUMP SUPPLY MODULE

H in m
20 Pump characteristic curve for n = 2900 rpm
18
16
14
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

12
10 n=2900 rpm
8 n=2750
n=2600
System Characteristic Curve
6
n=2000
4
2 n=1450 rpm

0
0 5 10 15 Q in m3/h
20

Fig. 5.3 Operating points of pump at n = 2900 rpm

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HM 365.10 WATER PUMP SUPPLY MODULE

5.1.3.5 Checking the required NPSH value for the pump

Reference Plane for The existing NPSH value for the system NPSHexist
NPSH Value is the difference between the total pressure head
and the vapour pressure head, based on the refe-
rence plane for the NPSH value:

p saug + p atm Vs2 p

Inlet NPSHvorh = + - D - H sgeo - Hvs + z s
cross r ×g 2 ×g r ×g
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

section

Reference Level

Fig. 5.4 „Suction from open tank“

For the example calculation, the conditions as
mode with negative head shown in Fig. 5.4 apply. For the case shown in Fig.
difference zs 5.5, the sign for the geodetic intake height H sgeo is
reversed, it becomes the inlet height H zgeo .

The existing NPSH value of the system NPSHexist

is to be determined.

Given: Pumped liquid water at t = 20°C

NPSHreq of the pump at 20 m3/h = 2.3 m
Reference Plane
for NPSH Value
Density of water = 1000 kg/m3
Vapour pressure of water at 20°C = 0.02337 bar
Atmospheric pressure = 1016 mbar
Intake pressure at the pump 0.776 bar (-0.24 bar
abs.) Loss level Hvs approx. 880 Pa = 0.08 m
Vs2
Reference Level calculated approximately = 0.4 m
2 ×g
Inlet Cross-Section
zs= 0.55 m (from technical drawing)
Fig. 5.5 „Feed from open tank“
mode with zs=0 H sgeo = approx. 1 m

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HM 365.10 WATER PUMP SUPPLY MODULE

The case „Suction from open tank“ exists. For this

case the intake pressure of the pump to be set to 0,
because only atmospheric pressure is acting on
the level of the liquid. The value of zsis negative be-
cause the reference plane for the NPSH value is
higher than the middle of the inlet cross-section (if
the reference plane is lower, then zs is positive).
The existing NPSH value for the system is:
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

N N
101600 2
- 2337 2
NPSHvorh = m m + 0,4m - 1m - 0,08m - 0,55m = 8,89m
kg m
1000 3 × 9,81 2
m s

As the maximum NPSH value required for the

pump is 2.3 m, the conditions for reliable operation
NPSHvorh ³ NPSH erf are met:
8.89 m ³ 2.8 m

On some types of pump, the NPSH value is not

relevant and is therefore not specified in the tech-
nical data.

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HM 365.10 WATER PUMP SUPPLY MODULE

5.2 Procedure for recording the pump characteristic curve using the HM
365.10 software, using the example of the HM 365.12 Centrifugal Pump
Module with Side Channel Stage

Self-priming pumps can draw in and pump air. If

self-priming pumps are used for pumping liquids,
they must be filled with water so that they can
commence operation. However, in contrast to
standard type centrifugal pumps, they are capable
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

of starting even if there is no column of liquid in the

intake pipe. On single stage self-priming pumps
this is made possible by a side-channel intake
stage via which the air drawn in, as shown in
Fig. 5.6 can be ejected either into the atmosphere,
into the intake tank, or the delivery pipe.

If the experiments are performed with PC data

acquisition, the user’s task is made considerably
Fig. 5.6 Ejection of Air Drawn in on a
Self-Priming Pump easier:
– Clearly laid out screens make learning easier
– Flow diagrams clarify the relationships
– The measured values are available online
and can be evaluated directly
– Results are calculated directly from the
current measured data and displayed
– It is possible to save and print tables and
graphs

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HM 365.10 WATER PUMP SUPPLY MODULE

Use of the HM 365.10 software is demonstrated

below using the example of „Recording the pump
characteristic curve“.
Preparation:
• Set up and couple the Water Pump Supply
Module to the HM 365 Universal Drive and
Brake Unit as described in Section 2.2.
• Mount pump model on the Water Pump Sup-
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

ply Module and connect as described in sec-

tion 2.3.
• Open valve fully, so that the pump can operate.
• Install PC software as described in section 2.7.
• Connect PC to HM 365 Universal Drive and
Brake Unit (HM 365 Section 2.5) and start data
acquisition program, Section 2.7.1.
• With non-self priming pumps, the pump and
the hoses must be filled with water the first
time they are installed (section 2.5). Close
the valve or ball cock in the water circuit of the
pump. Once the pump has started up, slowly
open the ball cock fully.
Measured data recording:
• Start up the pump with Universal Drive and
Brake Unit (see HM 365, section 4.1-4.2).
– Set speed potentiometer to zero
– Switch on master switch
– Check direction of rotation. The change-
over switch for the direction of rotation is
located on the rear of the HM 365.
– Set t orque potentiometer to
max.(HM 365 Fig. 2.2-4)
– Start up the pump using speed poten-
tiometer.

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HM 365.10 WATER PUMP SUPPLY MODULE

• Operate pump with Universal Drive and

Brake Unit at maximum speed.
• In the software, select the „Curve measure-
ment“ window
– Select application with one pump
(HM 365.1x).
– Choose the axis (Fig. 2.11-11)
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

– Press the „New curve“ button. Then

enter the name and comments.
• Record the current values using the „Take
measuring point“ button
• Set the flow displayed to the desired value
using the valve
• Keep the speed constant by adjusting it on
the potentiometer.
• Wait until the values have stabilised
• Record the current values using the „Take
measuring point“ button To take further
measuring points, repeat the last 4 points.
• You can then either save the complete data
record on the PC using the „Save curve“
button or record more data records.
Incorrect measured values can be deleted from
the saved operating points later and new measu-
ring points can be added to the file to increase the
detail.
The measured values should be used for orienta-
tion; they are not guaranteed values. Significant
differences can occur due to external environmen-
tal conditions such as temperatures, mains volt-
ages and mains frequencies.

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HM 365.10 WATER PUMP SUPPLY MODULE

6 Appendix

6.1 Technical data

6.1.1 HM 365.10 Basic Water Pump Module

Power Supply
230 V, ~50 Hz,
Optional alternatives, see rating plate
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

Dimensions
L x W x H: 1200 x 800 x 1150 mm
Weight: approx 80 kg

Measuring Range
Intake Pressure Measurement: -1 ... +1 bar
Delivery Pressure Measurement: 0...6 bar
Temperature Measurement: 0...100 °C
Flow measurement: 0...25 m3/h

Supply Tank
Capacity: 96 ltr

PC requirements
Progam environment:
– LabVIEW Runtime
System requirements:
– PC with processor Pentium IV, 1 GHz
– Minimum 1024 MB RAM
– Minimum 1 GB available memory on hard
disk
– 1 CD-ROM drive
– 1 USB port

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HM 365.10 WATER PUMP SUPPLY MODULE

– Graphics card resolution

min. 1024 x 768 pixels, True Color
Windows XP / Windows Vista
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

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HM 365.10 WATER PUMP SUPPLY MODULE

6.1.2 HM 365.11 Centrifugal Pump Module

Maximum Flow Rate: 21 m3/h

Maximum Head: 19 m
Nominal speed: 2900 rpm
NPSHreq at Qmax : 2.3 m
Intake Fitting Diameter: DN 50
Delivery Fitting Diameter: DN 32
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

V-Belt Transmission Ratio i: 1

Maximum Electric Motor Speed: 2900 rpm
NOTICE! Remove residual water from the pump
after use.
Fig. 6.1 Centrifugal pump HM 365.11

1 Spiral Housing
2 Housing Cover
3 Support
4 Shaft
5 Impeller
6 Ball bearing
7 Bearing Carrier
8 Floating Seal
9 Shaft Seal

Fig. 6.2 Cut-Away View of a centrifugal pump

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HM 365.10 WATER PUMP SUPPLY MODULE

6.1.3 HM 365.12 Centrifugal Pump Module with Side Channel Stage

Maximum Flow Rate: 18 m3/h

Maximum Head: 18 m
Nominal speed: 2900 rpm
NPSHreq at Qmax : 3m
Intake Fitting Diameter: DN 50
Delivery Fitting Diameter: DN 32
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

V-Belt Transmission Ratio i:

Maximum Electric Motor Speed: 2900 rpm
NOTICE! Remove residual water from the pump
after use.

Fig. 6.3 Self priming centrifugal pump

HM 365.12

1 Spiral Housing
2a,b Spacer
3 Housing Cover
4 Support
5 Shaft
6 Impeller
7 Impeller
8 Angular Contact Ball
Bearing
9 Grooved Ball Bearing
10 Bearing Carrier
11 Floating Seal
12 Shaft seal housing
13 Air Bleed Pipe
14 Screwed fitting with orifice

Fig. 6.4 Cut-Away View of a self-priming centrifugal pump

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HM 365.10 WATER PUMP SUPPLY MODULE

6.1.4 HM 365.13 Multistage Centrifugal Pump Module

Maximum Flow Rate: 12 m3/h

Maximum Head: 25 m
Nominal speed: 1450 rpm
NPSHreq at Qmax : 3.9 m
Intake Fitting Diameter: DN 50
Delivery Fitting Diameter: DN 32
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

V-Belt Transmission Ratio i: 1,6

Maximum Electric Motor Speed: 2320 rpm
NOTICE! Remove residual water from the pump
after use.
Fig. 6.5 Multistage centrifugal pump
HM 365.13

1 Intake Fitting
2 Pressure fitting
3 Stage housing
4 Control wheel
5 Shaft
6 Impeller
7 Bearing housing
8 Floating seal
9 Shaft seal housing
10 Shaft Seal
11 Seal cover
12 Shaft sleeve

Fig. 6.6 Cut-Away View of a multistage centrifugal pump

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HM 365.10 WATER PUMP SUPPLY MODULE

6.1.5 HM 365.14 Series / Parallel Pumps Module

Data for one pump: FHF 32-125/136

Maximum Flow Rate: 24 m3/h
Maximum Head: 22 m
Nominal speed: 2900 rpm
NPSHreq at Qmax : 2.3 m
Intake Fitting Diameter: DN 50
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

Delivery Fitting Diameter: DN 32

V-Belt Transmission Ratio i: 1
Maximum Electric Motor Speed: 2900 rpm
Fig. 6.8 HM 365.14
Parallel connection: Set the 3-way stopcock with the T-marker so that both
pumps can draw water from the suction line. Set the ball valve (open) so that
both pumps feed into the pressure line.
Series connection: Set the 3-way stopcock so that the suction fed only the
pump with the pressure sensor p1. After leaving the 1st pump the water to the
suction side of the second pump must flow. Set the ball valve (close) so that
only the second pump can promote in the pressure line.
NOTICE! After use, drain the remaining water from the pump to the drain plug
(size 22) under the suction flange.

1 Spiral Housing
2 Housing Cover
3 Support
4 Shaft
5 Impeller
6 Ball bearing
7 Bearing Carrier
8 Floating Seal
9 Shaft Seal

Fig. 6.7 Cut-Away View of one centrifugal pump

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HM 365.10 WATER PUMP SUPPLY MODULE

Pump- and system characteristic curves for HM 365.14

Pump Characteristic
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

System Characteristic

Fig. 6.9 Parallel-operation with HM 365.14

Pump Characteristic

System Characteristic

Fig. 6.10 Serial-operation with HM 365.14

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HM 365.10 WATER PUMP SUPPLY MODULE

6.1.6 HM 365.15 Side Channel Pump Module

Maximum Flow Rate: 5.0 m3/h

Maximum Head: 48 m
Nominal speed: 1450 rpm
NPSHreq: -
Intake Fitting Diameter: 1"
Delivery Fitting Diameter: 1"
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

V-Belt Transmission Ratio i: 2

Maximum Electric Motor Speed: 2900 rpm
NOTICE! Remove residual water from the pump
after use.

Fig. 6.11 Side channel pump

HM 365.15

Fig. 6.12 Cut-Away View of a side channel pump

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HM 365.10 WATER PUMP SUPPLY MODULE

6.1.7 HM 365.16 Lobe Pump Module

Maximum Flow Rate: 1.5 m3/h

Maximum Head: 100 m
Maximum Speed: 1500 rpm
NPSHreq: -
Intake Fitting Diameter: 3/4"
Delivery Fitting Diameter: 3/4"
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

V-Belt Transmission Ratio i: 2

Maximum Electric Motor Speed: 3000 rpm
Depending on the construction, the maximum
pressure that can be reached depends on the
viscosity of the pumped medium.
NOTICE! Check the oil level before starting up the
pump! Top up oil if necessary (single grade oil
SAE30 is recommended)!
Check the oil level at regular intervals.

Fig. 6.13 Lobe pump HM 365.16

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HM 365.10 WATER PUMP SUPPLY MODULE

6.1.8 HM 365.17 Piston Pump Module

Maximum Flow Rate: 1.5 m3/h

Maximum Head: 60 m
Max. rotational speed: 1450 rpm
max. Hubzahl PM 15: 337 min-1
Intake Fitting Diameter: 1"
Delivery Fitting Diameter: 1"
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

V-Belt Transmission Ratio

Drive unit - pump i: 1,6
Pump internal transmission i: 4,3
Maximum Electric Motor Speed: 2320 rpm

Fig. 6.14 Piston Pump HM 365.17

NOTICE! Check the oil level before starting up the

pump! Top up oil if necessary (single grade oil
SAE30 is recommended)!
Check the oil level at regular intervals.
Bleeding the Pump
In addition to the steps described in section 2.3.
this pump must also be filled with water using the
vent screw (1). The belt pulley on the pump must
be rotated by hand.

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HM 365.10 WATER PUMP SUPPLY MODULE

Pump- and system characteristic curves of HM 365.14

All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

Fig. 6.15 Pump characteristic curve of the piston pump

Fig. 6.16 System characteristic curve of the piston pump

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HM 365.10 WATER PUMP SUPPLY MODULE

6.1.9 HM 365.18 Gear Pump Module

Maximum Flow Rate: 4.2 m3/h

Maximum Head: 60 m
Nominal speed: 1700 rpm
NPSHreq: -
Intake Fitting Diameter: 1"
Delivery Fitting Diameter: 1"
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

V-Belt Transmission Ratio i: 1,6

Maximum Electric Motor Speed: 2720 rpm
NOTICE! Remove residual water from the pump
after use.

Fig. 6.17 Gear Pump HM 365.18

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HM 365.10 WATER PUMP SUPPLY MODULE

6.1.10 HM 365.19 Vane Pump Module

Maximum Flow Rate: 4.2 m3/h

Maximum Head: 22 m
Maximum Speed: 1400 rpm
NPSHreq: -
Intake Fitting Diameter: 1"
Delivery Fitting Diameter: 1"
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

V-Belt Transmission Ratio i: 1,44

Maximum Electric Motor Speed: 2016 rpm
NOTICE! Remove residual water from the pump
after use.

Fig. 6.18 Vane pump HM 365.19

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HM 365.10 WATER PUMP SUPPLY MODULE

6.2 Symbols

h Efficiency
g Acceleration Due to Gravity m/s2
H Head m
M Torque Nm
n Speed rpm
NPSH Value Min. Excess pressure to
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

prevent cavitation
Pmech Mechanical power W
Phydr Hydraulic power output W
p1 Pressure at pump inlet bar
p2 Pressure at pump outlet bar
pD Pressure on pressure side bar
pS Pressure on inlet side bar
Q Volumetric flow l/min, m3/h
r Density kg/m3
w Angular frequency 2 × p × n
VD Speed on pressure side m/s
VS Speed on inlet side m/s
zD Head on pressure side m
zS Head on inlet side m

6.3 References

Dubbel; Taschenbuch für den Maschinenbau,

13.Edition, 1974; Springer-Verlag

6.4 Items supplied

1 x HM 365.10 Water Pump Supply Module

1 x HM 365.10 Experimental instructions

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HM 365.10 WATER PUMP SUPPLY MODULE

6.5 Index

A
Air bleed connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
B
Ball cock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3, 5
C
Centrifugal pumpe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Connecting hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

D
Delivery pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
E
Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
F
Flow rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Flowmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Foot valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
H
Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Hydraulic power output . . . . . . . . . . . . . . . . . . . . . . . . . . 22
I
Intake pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Intake pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
M
Mains connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Measured data recording. . . . . . . . . . . . . . . . . . . . . . . . . 29
Measuring unit block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
N
NPSH value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14, 26
O
Operating point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
P
Power required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Pump characteristic curve . . . . . . . . . . . . . . . . . . . . . . . . 15
Pump mountings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
R
Reciprocating pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
S
Snap-action fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Supply tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
System characteristic curve . . . . . . . . . . . . . . . . . . . . . . . 16

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HM 365.10 WATER PUMP SUPPLY MODULE

T
Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
V
Vane-type rotary pump . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Volumetric flow rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
All Rights Reserved G.U.N.T. Gerätebau GmbH, Barsbüttel, Germany 11/2011

6 Appendix 46