GB2313197A - Measuring pump flow rate - Google Patents
Measuring pump flow rate Download PDFInfo
- Publication number
- GB2313197A GB2313197A GB9709121A GB9709121A GB2313197A GB 2313197 A GB2313197 A GB 2313197A GB 9709121 A GB9709121 A GB 9709121A GB 9709121 A GB9709121 A GB 9709121A GB 2313197 A GB2313197 A GB 2313197A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pump
- flow rate
- flow
- pumps
- power consumption
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/306—Mass flow
- F05D2270/3061—Mass flow of the working fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/335—Output power or torque
Abstract
A method of measuring the flow rate of a pump comprises: a) collating data concerning the power consumption of the pump and the flow rates obtained under initial or optimal conditions, b) obtaining information as to the actual power consumption of the pump, and c) comparing said information with the collated data (and carrying out any necessary calculations) to obtain a flow rate measurement. The method may be used to obtain individual flow rates of a number of pumps operated in parallel, or combined with pump head measurements to obtain an indication of pump performance.
Description
PUMPS
Field of the Invention
This invention relates to pumps, for example, pumps used for pumping water and sewage and pumps used in a pumping station for pumping water out of an underground supply. The invention also relates to the measurement of flow through a pump.
Background to the Invention
Information is often required concerning the flow rate of the fluid being pumped and many types of flow meters have accordingly been developed.
There are, however, situations in which it can be either very difficult or very expensive to measure flow rates. For example, there is at present no satisfactory way of obtaining accurate measurements for the flow rates obtained during operation of sewage pumps and activated sludge pumps. The principal reason for this is that many pumping installations are such that the pipework configuration is not conducive to accurate measurements by the traditional methods, for example, using magnetic and ultrasonic flow meters.
There are also situations in which one or more pumps are arranged to operate in parallel and, although the combined flow rate is determined (since this is the parameter for which precise control is required), the individual flow rates attributable to the separate pumps are not measured.
It is accordingly an object of a first aspect of the present invention to provide an improved method for measuring the flow rate obtained during operation of a pump.
In use, a pump will be subject to wear and, as the degree of wear increases, the efficiency of the pump is reduced and the cost of operation of the pump to obtain a predetermined output is increased. Pump refurbishment is, however, expensive and the operators, for example, water companies, do not wish to carry out refurbishment unless and until they are satisfied that refurbishment will actually produce a cost saving.
It is accordingly an object of a second aspect of the present invention to provide an improved method of determining the performance of a pump.
Summarv of the Invention
According to a first aspect of the present invention there is provided a method of measuring the flow rate obtained during operation of a pump, which method comprises:
a) collating data concerning the power consumption of the
pump and the flow rates obtained under initial or optimal
conditions,
b) obtaining information as to the actual power consumption
of the pump during operation thereof, and
c) comparing said information with the collated data (and
carrying out any necessary calculations) to obtain a flow
rate measurement.
Where a plurality of pumps are arranged to operate in parallel so as to obtain a combined flow rate, the combined flow rate may be measured using a flow meter and the flow rates attributable to the individual pumps may be measured by determining the power consumptions of the individual pumps and carrying out the appropriate computations.
The data concerning the power consumption of the pump and the flow rates obtained under initial or optimal conditions may be the data supplied by the pump manufacturer on initial installation of the pump, or it may be data derived from initial trials carried out on site.
The relationship between the power consumption of the pump and the flow rates obtained during initial or optimal conditions may be one of three curves supplied by the pump manufacturer to the user of the pump, the other two curves showing the relationship between the pump head and the pump flow rate and the relationship between the pump efficiency and the pump flow rate.
In the case of pumps which have complex powerlflow curves, i.e. high specific speed pumps, the method may be enhanced by cross-referencing the head/flow curve to the powerlflow curve.
Thus, ifQ1=fP1, and Q1 = f H1, where Q = flow, P = power and H = head, then Q can be defined either as a function of P, or as a function of
H, or as the average of a function of P and a function of H.
The algorithm used in the calculation of flow may accordingly be selected to use the most sensitive method. For example if dP/dQ > dH/dQ, then the function Q = fP is used. On the other hand, if dP/dQ < dH/dQ, then the function Q = fld is used. In addition, if dP/dQ is approximately equal to dH/dQ, then the function Q = (fP + fH)/2 is used.
According to a second aspect of the present invention, there is provided a method of determining pump performance, which comprises the following steps:
a) measuring the flow rate of the pump by the method defined
above,
b) measuring the pump head,
c) collating data concerning the pump head and the flow rates
obtained under initial or optimal conditions, and
d) comparing the results of said measurements with the
collated data (and carrying out any necessary calculations)
to obtain an indication of pump performance.
Pressure transducers are preferably provided at the pump inlet and outlet to determine the pump head, i.e. the difference between the pressure at the pump outlet and the pressure at the pump inlet plus any velocity head difference between the suction pressure point and the discharge pressure point and any static head difference between the two measuring points.
The information obtained may be expressed in terms of pump efficiency expressed as a percentage of the present pump efficiency in relation to the initial pump efficiency.
With information as to the pump efficiency expressed in this form, further calculations can be carried out to obtain a more accurate determination of the pump flow rate as compared to the actual power consumption.
The information concerning pump efficiency can also be used to carry out an assessment of the need for pump refurbishment.
Brief Descrintion of the Drawings
Figure 1 shows a number of operational curves for a typical worn pump, and
Figure 2 is a diagrammatic illustration of a system including four pumps for pumping water from an underground source to a reservoir.
Descrintion of the Preferred Embodiment
Six curves are shown in Figure 1, as follows:
a) curve 10 shows the relationship between pump head and
pump flow rate for a new pump, i.e. in accordance with the
data supplied by the pump manufacturer or as a result of
readings taken on installation of a new pump,
b) curve 11 shows the relationship between pump head and
pump flow rate after the pump has been in use for a
significant length of time and its condition is such that
pump refurbishment should be considered,
c) curve 12 shows the relationship between the power
supplied to the motor driving the pump and pump flow rate
for a new pump,
d) curve 13 shows the relationship between the power supply
to the motor and pump flow rate for the worn pump
mentioned above,
e) curve 14 shows the relationship between the pump
efficiency and pump flow rate for a new pump, and
f) curve 15 shows the relationship between the pump
efficiency and the pump flow rate for the worn pump
mentioned above.
When a pump is supplied to, for example, a water treatment works or a waste water works, the manufacturer will supply the pump user with information containing curves 10,12 and 14 so as to assist the user in operating the pump at maximum efficiency.
When, however, the pump is in use and wear has taken place to an extent such that pump refurbishment is due, the relationship between efficiency and pump flow rate will have changed from curve 14 to curve 15.
There are a large number of flow meters currently available for measuring many different types of fluid flow. There are, however, as explained above, none that can currently be used for measuring the flow rates achieved by activated sludge pumps used for pumping raw activated sludge.
The pump operator can, however, be made aware of the power (or can himself measure the power) which is being consumed by the motor which is driving the sludge pump. Once information of power consumption is obtained, curve 12 will enable the pump operator to obtain an initial approximate indication of the pump flow rate. As a result of wear of the pump, the relationship between the pump power consumption and the fluid flow rate will be represented more accurately by curve 13 and additional calculations will accordingly preferably be carried out to obtain a more accurate indication of the flow rate. Such additional calculations may, as described above, include the use of the relationship between the pump head and the flow rate.
Turning next to Figure 2, this shows schematically an arrangement in which four pumps P1, P2, P3 and P4 are driven by respective motors Ml, M2, M3 and M4 to pump water from, for example, a borehole or an underground well, into a main supply pipe 20 for delivery of the water into, for example, a reservoir. The main supply pipe 20 contains a flow meter FM and the system operator is thus aware of the sum of the flow rates achieved by the pumps and he may control the number of pumps operating at any one time to achieve the required rate of supply.
In the absence of flow meters in the lines 21, 22, 23 and 24 leading from the pumps P1, P2, P3 and P4 to the main supply pipe 20, the system operator will not be aware of the contribution to the total flow afforded by each pump and, if the overall requirements for the supply of water are such that at least two pumps are always operating at any one time, there will be no ready means for calculating the efficiencies of the individual pumps and thereby achieving the most economical method of operation.
When, however, information concerning the pump power consumptions is obtained and curve 12 for each of the pumps is used, this will give an approximate indication of the flow rate contribution for each pump.
In addition, however, pressure transducers (not shown) are provided at the inlets and the outlets of each of the pumps, thus enabling the pressure head for each pump to be measured. The information thereby obtained concerning pump heads and flow rates can then be used to produce curves corresponding to curve 11. The degree of difference between such curves and the original curves 10 for each of the pumps will enable further calculations to be carried out so as to obtain more accurate figures for the actual flow rates for the individual pumps and also to generate curves corresponding to curves 15 showing the extent by which the performance or efficiency of each pump has been reduced as a result of wear.
The data which is obtained by the method described above not only enables the system operator to identify the flow rate contributions of the individual pumps but also provides a simple and cost-effective way of monitoring pump performance. This then enables pump maintenance and refurbishment programmes to be carried out in the most effective manner.
It will thus be possible to carry out an on-going monitoring programme from the data obtained by determining the inlet and outlet pressures of the individual pumps and the power consumptions of the pumps, and carrying out computations using such data.
Claims (10)
1. A method of measuring the flow rate obtained during operation of a pump, which method comprises:
a) collating data conceming the power consumption of the
pump and the flow rates obtained under initial or optimal
conditions,
b) obtaining information as to the actual power consumption
of the pump during operation thereof, and
c) comparing said information with the collated data (and
carrying out any necessary calculations) to obtain a flow
rate measurement.
2. A method as claimed in Claim 1, in which the data concerning the power consumption of the pump and the flow rates obtained under initial or optimal conditions is the data supplied by the pump manufacturer on initial installation of the pump.
3. A method as claimed in Claim 2, in which the relationship between the power consumption of the pump and the flow rates obtained during initial or optimal conditions is one of three curves supplied by the pump manufacturer to the user of the pump, the other two curves showing the relationship between the pump head and the pump flow rate and the relationship between the pump efficiency and the pump flow rate.
4. A method as claimed in Claim 3, in which, in the case of pumps which have complex power/flow curves, the method is enhanced by cross-referencing the head/flow curve to the power/flow curve.
5. A method as claimed in Claim 1, substantially as hereinbefore described with reference to Figure 1 of the drawings.
6. A method as claimed in Claim 1, in which, where a plurality of pumps are arranged to operate in parallel so as to obtain a combined flow rate, the combined flow rate is measured using a flow meter and the flow rates attributable to the individual pumps are measured by determining the power consumptions of the individual pumps and carrying out the appropriate computations.
7. A method as claimed in Claim 6, substantially as hereinbefore described with reference to Figure 2 of the drawings.
8. A method of determining pump performance, which comprises the following steps:
a) measuring the flow rate of the pump by the method
claimed in Claim 1,
b) measuring the pump head,
c) collating data concerning the pump head and the flow rates
obtained under initial or optimal conditions, and
d) comparing the results of said measurements with the
collated data (and carrying out any necessary calculations)
to obtain an indication of pump performance.
9. A method as claimed in Claim 8, in which pressure transducers are provided at the pump inlet and outlet to determine the pump head.
10. A method as claimed in Claim 8, substantially as hereinbefore described with reference to the drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9609593.0A GB9609593D0 (en) | 1996-05-08 | 1996-05-08 | Pumps |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9709121D0 GB9709121D0 (en) | 1997-06-25 |
| GB2313197A true GB2313197A (en) | 1997-11-19 |
| GB2313197B GB2313197B (en) | 2000-06-14 |
Family
ID=10793353
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9609593.0A Pending GB9609593D0 (en) | 1996-05-08 | 1996-05-08 | Pumps |
| GB9709121A Expired - Lifetime GB2313197B (en) | 1996-05-08 | 1997-05-07 | Method for measurement of pump flow rate |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9609593.0A Pending GB9609593D0 (en) | 1996-05-08 | 1996-05-08 | Pumps |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB9609593D0 (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003031918A1 (en) * | 2001-10-09 | 2003-04-17 | Abb Ab | Device, system and method for on-line monitoring of flow quantities |
| WO2005026922A1 (en) * | 2003-09-15 | 2005-03-24 | Du Plessis Francois Jacobus | Method and apparatus for determining the approximate flow rate of a fluid through a pump |
| WO2005085772A1 (en) * | 2004-03-04 | 2005-09-15 | Abb Oy | Method and arrangement for measuring indirectly with power, rotation speed and pump head the flow in a pump |
| WO2007018044A1 (en) * | 2005-08-10 | 2007-02-15 | National University Corporation Tokyo Medical And Dental University | Method and device for measuring flow rate and head of centrifugal pump, and circulation state evaluation device for pulsating circulation system |
| GB2430496A (en) * | 2005-09-27 | 2007-03-28 | Advanced Energy Monitor Syst | Measuring input power and flow rate in a pipline for determining a leakage or blockage condition |
| CN102734184A (en) * | 2011-03-31 | 2012-10-17 | Abb公司 | Method and arrangement for estimating flow rate of pump |
| EP2696175A1 (en) | 2012-08-07 | 2014-02-12 | Grundfos Holding A/S | Method for detecting the flow rate of a centrifugal pump |
| EP2518455A3 (en) * | 2011-03-23 | 2014-07-02 | General Electric Company | Use Of Wattmeter To Determine Hydraulic Fluid Parameters |
| US9091262B2 (en) | 2011-05-27 | 2015-07-28 | General Electric Company | Use of wattmeter to obtain diagnostics of hydraulic system during transient-state start-up operation |
| CN105424105A (en) * | 2015-11-06 | 2016-03-23 | 湖南核三力技术工程有限公司 | Dust removal system main pipe blast capacity detecting method and online detecting device |
| GB2537460A (en) * | 2015-02-16 | 2016-10-19 | Pulsar Process Measurement Ltd | Pump station monitoring method |
| EP3157874B1 (en) | 2014-06-17 | 2019-02-27 | Xylem IP Management S.à.r.l. | Plant for treatment of liquid as well as method for controlling such a plant |
| EP3654009A3 (en) * | 2018-11-16 | 2020-08-19 | Viega Technology GmbH & Co. KG | Assembly and method for detecting leaks in a water guidance system |
| US10859082B2 (en) | 2017-08-15 | 2020-12-08 | Schlumberger Technology Corporation | Accurate flow-in measurement by triplex pump and continuous verification |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201900009747A1 (en) | 2019-06-21 | 2020-12-21 | Calpeda A Spa | Method of management and control of a pressurization system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4108574A (en) * | 1977-01-21 | 1978-08-22 | International Paper Company | Apparatus and method for the indirect measurement and control of the flow rate of a liquid in a piping system |
| US4781525A (en) * | 1987-07-17 | 1988-11-01 | Minnesota Mining And Manufacturing Company | Flow measurement system |
| GB2260406A (en) * | 1991-10-09 | 1993-04-14 | South West Water Plc | Pump testing |
| EP0674154A1 (en) * | 1994-03-09 | 1995-09-27 | Bij de Leij, Jan Doeke | Method and device for determining the flow rate of a pumped fluid |
-
1996
- 1996-05-08 GB GBGB9609593.0A patent/GB9609593D0/en active Pending
-
1997
- 1997-05-07 GB GB9709121A patent/GB2313197B/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4108574A (en) * | 1977-01-21 | 1978-08-22 | International Paper Company | Apparatus and method for the indirect measurement and control of the flow rate of a liquid in a piping system |
| US4781525A (en) * | 1987-07-17 | 1988-11-01 | Minnesota Mining And Manufacturing Company | Flow measurement system |
| GB2260406A (en) * | 1991-10-09 | 1993-04-14 | South West Water Plc | Pump testing |
| EP0674154A1 (en) * | 1994-03-09 | 1995-09-27 | Bij de Leij, Jan Doeke | Method and device for determining the flow rate of a pumped fluid |
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003031918A1 (en) * | 2001-10-09 | 2003-04-17 | Abb Ab | Device, system and method for on-line monitoring of flow quantities |
| US6918307B2 (en) | 2001-10-09 | 2005-07-19 | Abb Ab | Device, system and method for on-line monitoring of flow quantities |
| WO2005026922A1 (en) * | 2003-09-15 | 2005-03-24 | Du Plessis Francois Jacobus | Method and apparatus for determining the approximate flow rate of a fluid through a pump |
| WO2005085772A1 (en) * | 2004-03-04 | 2005-09-15 | Abb Oy | Method and arrangement for measuring indirectly with power, rotation speed and pump head the flow in a pump |
| US7349814B2 (en) | 2004-03-04 | 2008-03-25 | Abb Oy, | Measurement method and arrangement |
| WO2007018044A1 (en) * | 2005-08-10 | 2007-02-15 | National University Corporation Tokyo Medical And Dental University | Method and device for measuring flow rate and head of centrifugal pump, and circulation state evaluation device for pulsating circulation system |
| JP2007044302A (en) * | 2005-08-10 | 2007-02-22 | Tokyo Medical & Dental Univ | Method and device for measuring flow rate and lift of centrifugal pump, and device for evaluating circulation state of pulsing circulation system |
| GB2430496A (en) * | 2005-09-27 | 2007-03-28 | Advanced Energy Monitor Syst | Measuring input power and flow rate in a pipline for determining a leakage or blockage condition |
| US8812264B2 (en) | 2011-03-23 | 2014-08-19 | General Electric Company | Use of wattmeter to determine hydraulic fluid parameters |
| EP2518455A3 (en) * | 2011-03-23 | 2014-07-02 | General Electric Company | Use Of Wattmeter To Determine Hydraulic Fluid Parameters |
| CN102734184B (en) * | 2011-03-31 | 2015-03-18 | Abb公司 | Method and arrangement for estimating flow rate of pump |
| CN102734184A (en) * | 2011-03-31 | 2012-10-17 | Abb公司 | Method and arrangement for estimating flow rate of pump |
| US9091262B2 (en) | 2011-05-27 | 2015-07-28 | General Electric Company | Use of wattmeter to obtain diagnostics of hydraulic system during transient-state start-up operation |
| US10041824B2 (en) | 2012-08-07 | 2018-08-07 | Grundfos Holding A/S | Method for detecting the flow rate value of a centrifugal pump |
| WO2014023642A1 (en) * | 2012-08-07 | 2014-02-13 | Grundfos Holding A/S | Method for detecting the flow rate value of a centrifugal pump |
| EP2696175A1 (en) | 2012-08-07 | 2014-02-12 | Grundfos Holding A/S | Method for detecting the flow rate of a centrifugal pump |
| EP3157874B1 (en) | 2014-06-17 | 2019-02-27 | Xylem IP Management S.à.r.l. | Plant for treatment of liquid as well as method for controlling such a plant |
| GB2537460A (en) * | 2015-02-16 | 2016-10-19 | Pulsar Process Measurement Ltd | Pump station monitoring method |
| US10626863B2 (en) | 2015-02-16 | 2020-04-21 | Pulsar Process Measurement Limited | Pump station monitoring system and method |
| CN105424105A (en) * | 2015-11-06 | 2016-03-23 | 湖南核三力技术工程有限公司 | Dust removal system main pipe blast capacity detecting method and online detecting device |
| CN105424105B (en) * | 2015-11-06 | 2018-07-31 | 湖南核三力技术工程有限公司 | Dust pelletizing system is responsible for air volume detecting method and on-line measuring device |
| US10859082B2 (en) | 2017-08-15 | 2020-12-08 | Schlumberger Technology Corporation | Accurate flow-in measurement by triplex pump and continuous verification |
| EP3654009A3 (en) * | 2018-11-16 | 2020-08-19 | Viega Technology GmbH & Co. KG | Assembly and method for detecting leaks in a water guidance system |
| US11493401B2 (en) | 2018-11-16 | 2022-11-08 | Viega Technology Gmbh & Co. Kg | Arrangement and method for detecting leaks in a water pipe system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2313197B (en) | 2000-06-14 |
| GB9609593D0 (en) | 1996-07-10 |
| GB9709121D0 (en) | 1997-06-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20170506 |