Measurements executed on the CWD 67 S pump with 6 different valve configurations

(1)

Measurements executed on the CWD 67 S pump with 6

different valve configurations

Citation for published version (APA):

Diepens, J. F. L. (1988). Measurements executed on the CWD 67 S pump with 6 different valve configurations. (TU Eindhoven. Vakgr. Transportfysica : rapport; Vol. R-940-D). Technische Universiteit Eindhoven.

Document status and date: Published: 01/01/1988 Document Version:

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Measurements executed on the

am

67 S pump

with 6 different valve configurations

DIEPENS.

J.

August 1988 R 940 D

WIND ENERGY CROUP

Technical University Eindhoven Faculty of Physics

Laboratory of Fluid Dynamics and Heat Transfer P.O. Box 513

5600 MB Eindhoven. the Netherlands

Consultancy Services

Wind Energy

Developing Countries

p.o. box 85 3800 ab amersfoort holland

(3)

cnrn:NTS

SUMMARY

1. INTRODUCT ION

2. DESCR I PT ION OF THE TEST STAND

3. DESCRIPTION OF THE MEASURED c::xlNFICURATIONS

4. ELUCIDATION OF THE MEASUREMENTS

4.1 General 4.2 Configuration 1. 2 and 3 4.3 Configuration 3 and -4 4.4 Configuration 5 and 6 5. c::xlNCLUSIONS 6. RECOMMENDATIONS 7. REFERENCES

ANNEX I

ANNEX II ANNEX III ANNEX IV ANNEX V ANNEX VI ANNEX VII ANNEX VIII ANNEX IX ANNEX X Measurements configuration 1 Measurements configuration 2 Measurements configuration 2 AF of configuration 1. 2 and 3 Measurements configuration 4

Pump rod force calculations of confIguration 3 and -4 iF of confIguration 3 and -4 Measurements of configuration 5 Measurements of confIguration 6 AF of configuration 5 and 6 Page 1 2 3 5 7 7 7 9 10 11 11 12 13 16 19 22 23 26 30 31 34 37

(4)

This report gives the results of experiments done with 6 different valve configura tions.

For the sIx different valve configurations pump rod force. pump rod speed

and flow have been measured. the mechanical efficiency and volumetric efficIency are computed.

(5)

1. InlRUXJCTICXC

This report describes some valve configurations which recently have been

tested at the

ruE

pump test rig lab. The tests were done to see what the influence of some modIfIcatIons would be on the valve behaviour and overall pump performance.

SIx dIfferent modIfIcations have been tested: 1. Valve with a chamber depth of 3 mm.

2. Flat valve.

3. Valve with a chamber depth of 0.5 mm.

4. Valve liftIng height increased from 3.5 upto 7 mm. 5. Valve with a low density (aluminium).

6. Valve with a high density (lead filled).

Configuration 1. 2 and 3 have been measured to check the influence of a

chamber on the opening pressure of the valve (pump rod force).

Configuration 3 and 4 have been measured to check the influence of the valve lifting height on the difference between maximum and mInimum force

(peak-peak) .

Configuration 5 and 6 have been measured to check the influence of the valve mass on the difference between the extreme values of the force.

(6)

2. DESaUPTIm OF 1lIE TEST STAll) (see fig. 1)

The pump test ri, (see description in report 813 A) provides an oscillating

guided and sealed stainless steel rod

4>

16 to which the pump rod can be coupled.

The stroke can be adjusted continuously from 0 upto 200 mm and the speed of the crank rod from 0 upto 2.6 rps.

The force in the pump rod Is measured with a force transducer type: E.

Brosa + 10 KN and the velocity of the pump rod is measured with a velocity transducer type: Schaevitz 7LIOVT-Z.

The flow 1s measured with an inductive flow meter: Flowtec 01 651 speed ma, Endress + Hauser. The water level in the pressure vessel is kept constant automatically by means of a float steered valve.

The pressure in the pressure vessel can be adjusted to a certain level. As test pump the CWO 67 S was used. The suction hei,ht was taken at 3 meter and the pressure in the pressure vessel was taken at 2 bar. With this the

total head is about 23 m

±

1 m. As suction pipe a 1 1/4" 6 meter long hose was used. The delivery piping was built up by addin, 2.5 meter 2" GI pipe

and 33 meter 1 1/4" GI pipe. The pump stroke was adjusted to 100 11m.

The data acquisition was done with a IBM.Xl personal computer equipped. with

a Metrabyte Dash 16 data acquisition board an Intel 8087 Math co-processor

and a Hercules graphics card. To collect and process data use was aade of

the scientific software package ASYST.

The accuracy of the components of the measuring system are: force transducer: - linearity 0.15%

- hysteresis 0.15%. amplifier for force transducer

± 0.5%

(7)

speed transducer + 1% of output

flow transducer + 1% of maximum flow range.

The accuracy of the analog to digital conversion is:

-10 V ... 0 bits

±

0.005 V

+10 V ... 4096 bits

(8)

3. IESCRIPTIm OF 1lfE IIEASURED alWICURATI(ft;

The CWO 67 S (see drawing E 8607-00) pump was used to test the different configurations. For each configuration both. piston- and foot valve were changed.

Configuration 1 (measurements p06701 M.VAL).

Valves with a chamber with a depth of 3 mm as given in fig. 2 were mounted. The valve lifting height was adjusted to 3.5 mm. The mass of the valves was 67

±

1 gr.

Configuration 2 (measurements p06702M.VAL).

The same valves as with configuration 1 were used with the difference that

they where mounted up side down (flat valve). The valve lifting height was adjusted to 3.5 mm.

Configuration 3 (measurements p06703M.VAL).

Valves with a chamber. with a depth of 0.5 1IIIl. as given in fig. 3 were

mounted. The valve lifting height was adjusted to 3.5 1IIIl. The weight of the

valves was 63

±

1 gr.

Configuration 4 (measurement p06704M.VAL).

The same valves as used in configuration 3 have been used. The valve lifting height was adjusted to 7 mm.

Valves as given in fig. 4 made of aluminium were mounted. The valve liftIng height was adjusted to 3.5 1IIIl. The mass of one valve was 21

±

1 gr.

Valves made of brass as given in fig. 4 with a lead inlay were mounted. The

valve lifting height was adjusted to 3.5 1IIIl. The mass of one valve was 80

±

(9)

FIgure 2. 3. -4

Fig. 2 and Fir.. 3 I

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(10)

4. EUJClDATI(Jf OF THE IIf.ASlJREIIIEN

4.1 Ceneral

For each configuration. force. speed and flow have been measured at six

rotation speeds.

The results of the six measurements are put together in a pump performance

graph for each configuration. Out of the force. speed and flow the volumetric and mechanical efficiency have been calculated.

The results are presented as indicator diagrams. In fig. 5 an example is given of an indicator diagram in which the pump force F is given as a

function of the piston position x. (x=O halfway the stroke).

4.2 Configuration 1, 2 and 3

The results of the measurements are presented in Annex I. II and III.

configuration 1 p06701*.VAL annex I configuration 2 p06702*.VAL annex II configuration 3 p06703*.VAL annex III

Upto 1 rps no significant difference can be seen between the three

configurations. Above 1 rps the valve closure delay of configuration 1 is bigger than from configuration 2 and 3.

An

explanation for this behaviour

Is that the flow speeds in a part of the gap are not so high as if flat valves were used (configuration 2) see fig. 6. Therefore the pre$sure difference over a flat valve Is bigger and with this the driving force to close It.

(11)

F [kN] 3 • • • 1.8.

••••

-.6 • • - 1 . 8 . Fig. 5 Figure 6 , ... :. 1 ro't~'tioft - - - ) "

','.,.,

.. , ... .. . ... .

-

....

-3 • . • 3 • • •

G---..,J

valve with chamber

• •••

M [MM]

I,

_J

]

r

flat valve

The valve of configuration 3 has an undeep chamber of only 0.5 mm and this

gives a _ller valve closure delay than configuration 2 with the flat valve but a lower openings force has not been found.

In annex IV the aaxiDlllll force step of the three configurations are compared: it shows that configuration 2 has the _Hest force step. However. the sample frequency of the .asurements was probably not high

(12)

4.3 Configuration 3 and 4

The results of the measurements are presented in annex

III

and

V.

configuration 3 p06703*.VAL annex III

configuration 4 p06704*.VAL annex V

configuration

3

and

4

delta F annex

VII.

The difference between the two configurations is the valve lifting height

3.5 mm for configuration 3 and 7 mm for configuration 4. It was expected

that larger valve lifting heights should give large shock forces but when

we compare the measurement of configuration 3 and 4 the difference is not

as large as predicted.

Within the CWO the shockforce has been calculated in the past with:

o

The prepared piston valve closure angle of configuration 3 is

±

14 and for configuration 4 is

±

210 at a pump rotation speed of 2.6 rps.

The dynamic force by the closure angle of piston valve is:

configuration 3 configuration 4

F

_f :::: 200

N

r cup 1438-Fstat-Ffr cup 1552-F -F stat fr cup

if the theory is correct then

Fsh (conflg. 3) Fsh (config. 4) = 1438-808-200 430 1552-808-200 = 544 = 0.79 o sin 14

=

0.675 ~ 0.79. sin 210

(13)

So the increase in dynamic force due to a higher value lifting height is less than theoretical expected and therefore higher valve lifting heights can be considered.

The pump rod forces of configuration 3 and 4 also have been calculated with the program PUMPROD.FOR [IJ release 1.1. The results can be found in annex

VI.

In table 1 the calculated and measured shock force are compared.

calculated measured deviation

config. 3 h

=

3.5 mm 370 430 + 16%

config. 4 h

=

7 mm 520 + 5%

Table 1 Measured and calculated shock forces.

4.4 COnfIguratIon 5 and 6

The results of the measurements are presented in annex VIII and IX. configuration 5 annex VIII

configuration 6 annex IX

The piston valve of configuration 5 (light valve) closes later than the piston valve of configuration 6 (heavy valve).

This was also measured

b7

Eric van Loon [2J. The foot valve closure angle for configuration 5 is upto 1.3 rps. higher than the closure angle of configuration 6. At higher rotational speeds the foot valve of config. 6 closes later than the foot valve of config. 5. This is not the same as Eric van Loon has found [2].

(14)

5. O'KllEI(ftS

a. Reduction of the valve openings force for valves with a small contact area has not been proved.

b. A valve with a deep chamber results in an increase of the closure angle.

c. The effect of a larger valve lifting height on the force step is not as big as expected.

d. The difference found between valves with different masses. are not always equal to the theorical predictions and the resul ts of valves measured by Eric van Loon [2] . A heavy valve resul ts in a larger

force-step for the higher rotation speeds.

6. REaRlENDATI(ftS

a. The effect of valves with chambers on the openings pressure has to be measured more accurate by means of the pressure difference over the valves and at high sample frequencies.

b. The valve lifting heights of the CWO pumps can be taken somewhat larger. c. The effect of higher valve lifting height must be measured for a

deepwell pump.

d. The CWO 81 D pump has heavy valves. A check if lighter valves will do better is necessary.

(15)

7. REFEREItCES

[1] Calculation of pump rod forces. User's guide to pump rod for WM-112. H.F. Veltkamp. January 1987.

[2] Metingen aan het klepgedrag van zulgerpompen. R 897 A. E.M.L. van Loon. Januari 1988.

(16)

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Annex 1-3

delta F, Emech, Evol

configuration 1

chamber of 3 mm

3000

delta f Nand Emech Evol ';'1000

2000~---+---~~4---~

1000r---+---~---~

rotationspeed [rps]

(19)

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Annex II-3

delta F, Emech, Evol

configuration

2

flat valve

3000

delta F Nand Emech Eval .;- 1 000

2000r---~---~---~ 1000r---~---~---~

h - - - - 6 - - - -

- - - 0 . /

0'

A---&---&

---6, 8"" ,

rotationspeed [rps]

(22)

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(24)

Annex 1II-3

delta F, Emech, Evol,

configuration

3

chamber 0.5 nnn

valve lifting height 3.5 nnn

3000

delta F Nand Emech Eval cr-1000

2000r---+---4---~~---~

1000r---+---4---~

rotationspeed [rps]

(25)

Annex IV

delta F

configuration 1,2 and 3

3000

delta F N

/0'

2000r---~---+--~--~~-A-· ----~ / / / / / / 1000r---~---~---~

.

'

rotationspeed

[rps]

(26)

'il."~ --) .: ... 'e4e3.VAL-Pi .. [WI: 25 •• 42 Po .. -tun: 3.I?'!! I:Yol • .133 lEMeeh .128 ... t .. 1 23 . •

_'_I

I ? . .. troke t .. l : .J. ,. [lcHI 1. a.,

••••

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-7."

7 . . . I t . . 35.. 41 •• ro-t.-tlo" ... 4 <rps): .31. .. ... r ... -tatl.... a .... _ _ 'low < .... 3/.) •• J.5 PI" UIl: 83 .•

a.

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(27)

til.ft~ --) .:P86?8413.VAL-Plft tWI: 118.a211 Pout.un: 81.?1I9 r (leN] 1 . 8 .

••••

Annex V-2 ~ J:U ; -~~'i' 1 .. otiot.loft

lI'~'

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....

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-

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_.

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(28)

Annex V-3

delta F,

Emech,

Evol

configuration

4

Valve lifting height 7 mm

3000

delta F Nand Emech E v 01 ..;.--..:1,....;:::O:...::;O:...;:O::....L-_ _ _

---,

2000r---~---~+--~----~ 1000r-~~---~---+---~

0

0 0---6--

- - - 0

--- ~---{j.---~

:-:,6 """

---

-8 ~ ~' It'

4"

/'

t1

1 2

rotationspeed [rps]

delta

F

---fs--

Emech

--€)--

Evol

(29)

Annex VI-J

CpMax CqO Dr LabdaD LabdaMax

0.287 0.15 2.0 1.30 2.35

Apri Etam ired Lcr Lpr mprm Rcrank

2e-4 0.80 1 0.25 15 0.6 0.050 Dp hcup hlv Lov mp mu Zv 0.067 0.015 0.0035 0.165 1.0 0.10 5.0 A Dhydr H k L Z xlr8 1.075e-3 0.038 3.0 0.00025 6.0 3.0 0 suctionpipe 3.525e-3 0.067 0.35 0.00025 0.35 0.0 1 cylinder

2.128e-3 0.050 0.0 0.00025 2.5 2.0 0 rising main

1.075e-3 0.038 20.0 0.00025 33.0 1.0 0 piping 1 1/ 1 1.0 0.0 0.0 0.0 0.0 0 1 1.0 0.0 0.0 0.0 0.0 0 1 1.0 0.0 0.0 0.0 0.0 0 1 1.0 0.0 0.0 0.0 0,0 0 1 1.0 0.0 0.0 0.0 0.0 0 1 LO 0.0 0.0 0.0 0.0 0 Data of CWO 2000 / 0,6

r

5 Latest update : 1989-12-07 Confio:uration 4

(30)

Annex VI-2

r~,=~===

===-CALCULATION OF PUMP ROD FORCES

PUMPROD.FOR : Release of Monday 1988-8-22 12:18:20.70 Data from input file : CWD20049.DAT

Design Wind Speed: 5.89 mls

Pump rod forces at 16.00 rad/s

Alfa Facppr Fstppr Facw Fstw Ffrw Ffrcup Ffrpv Ftotal

dec; N N N N N N N N 0 154 98 0 0 0 0 0 252 10 150 98 0 0 0 0 0 248 20 140 98 17 808 51 78 0 1192 30 124 98 15 808 51 78 0 1174 40 102 98 13 808 51 78 0 1150 50 78 98 10 808 51 78 0 1122 60 51 98 6 808 51 77 0 1092 70 24 98 3 808 51 77 0 1061 80 -2 98 -0 808 51 77 0 1031 90 -26 98 -3 808 51 77 0 1004 100 -46 98 -6 808 51 76 0 981 110 -63 98 -8 808 51 76 0 961 120 -77 98 -9 808 51 76 0 946 130 -87 98 -11 808 51 76 0 935 140 -94 98 -12 808 51 76 0 927 150 -98 98 -12 808 Sl 76 0 922 160 -101 98 -12 808 51 76 0 919 170 -102 98 -13 808 51 76 0 918 180 -102 98 -13 808 51 76 0 917 190 -102 98 0 0 0 0 -4 -8 200 -101 98 0 0 0 0 -16 -19 210 -98 98 0 0 0 0 -36 -36 220 -94 98 0 0 0 0 -62 -58 230 -87 98 0 0 0 0 -94 -82 240 -77 98 0 0 0 0 -128 -106 250 -63 98 0 0 0 0 -161 -126 260 -46 98 0 0 0 0 -190 -138 270 -26 98 0 0 0 0 -210 -138

...

280 -2 98 0 0 0 0 -218 -122 290 24 98 0 0 0 0 -212 -90 300 51 98 0 0 0 0 -191 -42 310 78 98 0 0 0 0 -157 19 320 102 98 0 0 0 0 -116 85 330 124 98 0 0 0 0 -72 149 340 140 98 0 0 0 0 -35 203 350 150 98 0 0 0 0 -9 239 360 154 98 0 0 0 0 -0 252 14 146 98 18 B08 51 78 0 1569 (1438 measured) Fsh - 370 N

(31)

Annex VI-3

CpMax eqO Dr LabdaO LabdaMax

0.287 0.15 2.0 1.30 2.35

Apri Etam ired Lcr Lpr mprm Rcrank

2e-4 0.80 1 0.25 15 0.6 0.050 Dp hcup hlv Lov mp mu Zv 0.067 0.015 0.0070 0.165 1.0 0.10 5.0 A Dhydr H k L Z xlr8 1.075e-3 0.038 3.0 0.00025 6.0 3.0 0 suctionpipe 3.525e-3 0.067 0.35 0.00025 0.35 0.0 1. cylinder

2.128e-3 0.050 0.0 0.00025 2.5 2.0 0 rising main

1.075e-3 0.038 20.0 0.00025 33.0 1.0 0 piping 1 1/ 1 1.0 0.0 0.0 0.0 0.0 0 1 1.0 0.0 0.0 0.0 0.0 0 1. 1.0 0.0 0.0 0.0 0.0 0 1. 1.0 0.0 0.0 0.0 0.0 0 1 1.0 0.0 0.0 0.0 0.0 0 1. 1.0 0.0 0.0 0.0 0.0 0

Data of CWO 2000 / oil ~ Latest update : 198r-12-07

(32)

Annex VI-4

==-==== _ - ===...r::z ₌₌₌₌₌

-CALCULATION OF POMP ROD FORCES

-==-====:=

PUMPROD.FOR : Release of Monday 1988-8-22 12:14:58.74 Data from input file : CWD20049.DAT

Design Wind Speed : 5.89 mi.

Pump rod forces at 16.00 rad/s

Alfa Facppr Fstppr Facw Fstw Ffrw Ffrcup Ffrpv Ftotal

deg N N N N N N N N 0 154 98 0 0 0 0 0 252 10 150 98 0 0 0 0 0 248 20 140 98 0 0 0 0 0 238 30 124 98 15 808 51 78 0 1174 40 102 98 13 808 51 78 0 1150 50 78 98 10 808 51 78 0 1122 60 51 98 6 808 51 77 0 1092 70 24 98 3 808 51 77 0 1061 80 -2 98 -0 808 51 77 0 1031 90 -26 98 -3 808 51 77 0 1004 100 -46 98 -6 808 51 76 0 981 110 -63 98 -8 808 51 76 0 961 120 -77 98 -9 808 51 76 0 946 130 -87 98 -11 808 51 76 0 935 140 -94 98 -12 808 51 76 0 927 150 -98 98 -12 808 51 76 0 922 160 -101 98 -12 808 51 76 0 919 170 -102 98 -13 808 51 76 0 918 180 -102 98 -13 808 51 76 0 917 190 -102 98 0 0 0 0 -1 -5 200 -101 98 0 0 0 0 -4 -7 210 -98 98 0 0 0 0 -9 -9 220 -94 98 0 0 0 0 -16 -11 230 -87 98 0 0 0 0 -23 -12 240 -77 98 0 0 0 0 -32 -11 250 -63 98 0 0 0 0 -40 -6 260 -46 98 0 0 0 0 -47 4 270 -26 98 0 0 0 0 -53 20 280 -2 98 0 0 0 0 -55 42

...

290 24 98 0 0 0 0 -53 69 300 51 98 0 0 0 0 -48 102 310 78 98 0 0 0 0 -39 137 320 102 98 0 0 0 0 -29 172 330 124 98 0 0 0 0 -18 204 340 140 98 0 0 0 0 -9 229 350 150 98 0 0 0 0 -2 246 360 154 98 0 0 0 0 -0 252 20 139 98 17 808 51 78 0 1711 (1552 measured)

(33)

Annex VII

delta F

configuration 3 and 4

3000

delta F N

2000r---+---~~4-~-~~---~ .I / ,-~#~# _ _ ---8----1000r---~---+---4---~

config

3 rotationspeed [rps]

---&--

config

4

(34)

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(35)

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(36)

Annex VIII-3

delta F, Emech, Evol

configuration

5

(aluminium)

3000

delta F Nand Emech Evol +1000

2000r---+---~~---~ 1000r--4F---+---4---~ l&... _ _ _ _ ===~ _~--- -G) ~ ... .,.u- -B- w ... -ei

rotationspeed [rps]

(37)

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