Measurements executed on a CWD 161 D pump with different valve lifting heights

Measurements executed on a CWD 161 D pump with different

valve lifting heights

Citation for published version (APA):

Diepens, J. F. L., & Beekman, P. C. (1988). Measurements executed on a CWD 161 D pump with different valve lifting heights. (TU Eindhoven. Vakgr. Transportfysica : rapport; Vol. R-941-D). Technische Universiteit

Eindhoven.

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

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Measurements executed on a

am

161 D pump

with different valve lifting heights

August 1988

DIEPENS.

J.

BEEKMAN. P.

WIND ENERGY CROUP

R 941 D

Technical University Eindhoven Faculty of Physics

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

5600 JIB Eindhoven. the Netherlands

Consultancy Services

Wind Energy

Developing Countries

p.O. boxes 3800 ab amersfoort holland

SUMMARY

1. INTRODUcr I ON

2. DESCR I PTION OF THE TEST STAND

3. DESCRIPTION OF THE MEASURED CONFIGURATIONS

3.1 Configuration 02 3.2 Configuration 03

4. ELUCIDATION OF THE MEASUREMENTS

4.1 Configuration 02 4.2 Configuration 03

5. CONCLUS IONS

6 . RECOMMENDATIONS

ANNEX I Measurements configuration 02 (h=7.5 mm)

ANNEX II Measurements configuration 03 (h=14.5 mm)

FIGURES Page 1 2 3 5 5 5 7 7

In this report measurements are reported, performed on a CWO 161 D pump

with a valve lifting height of 7.5 and 14.5 Mm. The tests done showed that

the influence of the valve lifting height on the shock force is less than

expected according the CWO theoretical model F _s = sin a _s ~k.m.

The CWO 161 D pump. with a valve lifting height of 7.5 mm, performed better

than the one with 14 mm valve lifting height.

Upto now it was assumed that increasing the valve lift height leads to

higher shock forces.

However traditional valve design rules as given in "Pompen door

J.e.

Andriessen" and used by many pump manufacturers resul t in large valve

lifting heights. These traditional design rules are based on the experience

with spring loaded valves.

CWO pumps have small valve lifting heights to reduce the shock forces.

which leads to very high flow speeds in the gap; l.e. 5 to 8 mls. This

results in a high pressure drop over the valves. a reduced netto suction

height for surface pumps and cavitation. To avoid those problems valve

lifting heights have to be increased and a balance must be found between

shock forces and flow restrictions.

In this report measurements are reported performed on a CWO 161 D pump with

a valve lifting height of 7.5 mm and 14.5 mm.

2. DESCRI Prlat OF TIlE TEST STAND

The pump test stand used was the so-called CWO 5001 test rig. see fig. 2.1.

For this test rig the CWO 5001 windmill was used. In which the rotor was

replaced by a DC motor with speed control.

The stroke can be adjusted from 80 to 200 DIll with steps of "lO DIll. The speed

range is from 0 upto 4 rps.

The force in the pump rod is measured with a force transducer type E. Brosa

+ 50 KN. The flow is measured with an inductive flow meter: Disco mag. DMI

65311H50 Endress + Hauser. The data acquisition was done with a IBM.XT

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 made 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%

flow transducer

±

IX of maxImum flow range. The accuracy of the AID conversion Is:

- 10 V ~O bits }

±

0.05 V + 10 V ~4096 bits

The well under the test rig has a depth of 33 meter. The CWO 161 D pump for,

the CWO 8000 was installed at a depth of 15.8 meter, ground level to foot

valve. The static head was taken at 14.9 meter. For the rising main 2" CI

pipe was used with a 3/4" pump rod inside. From the delivery T to the

de-aeration vessel 3 meter 2" plastic hose was used. The stroke was

adjusted at 200 lID.

3.1 Configurat.ion 02

Pump tested: CWO 161 D pump for use with CWO 8(X)() windmill (drawing

E8504-OO/C, fig. 2.2).

stroke volume

volume air chamber

diameter rising main

diameter pump rod

installation depth

static load

static pump rod force

.. 1 231

2" CI pipe (ID 52 mm) 3

~f CI pipe (OD 27 mm)

15.8 m (foot valve - ground level)

14.9 m 2900 N

The valve lifting height of foot and piston valve was taken at 7.5 mm.

3.2 Configuration 03

Pump tested CWO 161 D for use with CWO 8(X)() windmill (drawing E8504-00/C,

fig. 2.2).

stroke volume

volume air chamber

diameter rising main

diameter pump rod

installation depth

static load

stat.ic pump rod force

.. I 231

2" CI pipe (ID 52 mm)

f'

CI pipe (OD 27 DIll)

15.8 m (foot valve - ground level)

1".9 m

2900 N

4. ELUCIDATICft OF 11IE JIEASUREJIEIffS

The results of the measurements are given in the annexes.

configuration 02 annex I PI6102 ..

configuration 03 annex II PI6103 ..

4.1 Configuration 02

Force. flow and speed are measured for n = 0.1 to 1.2 rps in steps of

0.1 rps. The results of the measurements are given in indicator diagrams (annex 1-1 - 1-13). An important value for the fatigue life of pump rods AF

=

F -F. has been calculated.

max mln

Annexes 1-14. 15. 16 and 17 give the results of AF. Q. 1'1mech and Tlvol versus the rotational speed. The best fitting polynom1al aproximations have been calculated and are for 0.1 ~ ~ ~ 1.2.

AF = F -F 1 = -Q.00Sw2 + 0.5~ + 3.+44 [KN] max m n Q

=

-6.06w2 + IO.27~ + 94.049 [Nm] 1'1mech 1'Ivol

=

0.00Sw3 - 0.087~2 + 0.368w + 0.3

=

0.00Sw3 _{- 0.081~2 + 0.393 + 0.347} 4.2 Configuration 03

Force flow and speed are measured for n=O.l to 1.1 rps in steps of 0.1 rps. The results of

the

measurements are given in indicator diagrams (annex 11-1

- 11-11).

Annexes

11-12. 13. 14.

15 give the results of AF.

Q.

~h and 1'Ivol versus the rotation speed. The best fitting polynomial aproximations. have been calculated and are: 0.1 ~ ~ ~ 1.1.

AF

=

F _{max m n} -F i

=

0.016w + 0.404w + 3.742 [KN] 1lvol 1'1mech

=

-o.~2 + 3.813w + 110.054

[Nm]

=

0.00Sw~ - 0.0Sw2 _{+ 0.372w + 0.415}

=

0.00Sw3 - 0.068w2 + 0.291w + 0.362

Configuration 03 was more noisy than configuration 02 durin, operation.

With configuration 02 the sound of opening and closln, the valves could be

heard clearly, a beating noise and confIguration 03 was making a loud noise

like a rattlin, car.

5. QK11lSIa'tS

- At almost all rotational speeds AF is higher for configuration 03 (h=14.S mm) than for configuration 02 (h=7.S mm) (see annex 111-1).

- For a 314" pump rod n ~ 1.4 rps to keep AF smaller than the maximum max

fatigue load of 7600 N.

- At almost all rotational speeds F is higher for configuration 03 (see max

annex 111-4) than for configuration 02.

- For rotational speeds of

±.

1 rps and higher. configuration 03 (see annex 111-4).

F i is lower for mn

- For rotational speeds of 0.6 rps and higher, "\nech is better for configuration 03.

- For rotational speeds below 0.8 rps. Tlyol is somewhat lower for

configuration 02. above 0.8 rps the differences in Tlyol for both configurations are very small.

- Configuration 03 is more noisy than configuration 02.

6. REa.EJft')ATI(ft;

- The choice of the valve lifting height must be made by balancing the effect of shock force and flow friction in the valves on AF.

- The best valve lifting height for the CWO 161 D is :!:: 7 ....

- More research has to be done on valve motion and opening pressure to understand their effects on the pump rod force.

(Xl

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