IS 11346: Tests for Agricultural and Water Supply Pumps - Code of Acceptance

31 Pages·2002·2.1 MB·English

by  Bureau of Indian Standards

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IS 11346 (2002): Tests for Agricultural and Water Supply
Pumps - Code of Acceptance [MED 20: Pumps]
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IS 11346:2002

Indian Standard
TESTS FOR AGRICULTURAL AND WATER SUPPLY
PUMPS — CODE OF ACCEPTANCE
(First Revision )
ICS 23.100.10
C)BIS 2002
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

December 2002 Price Group 9
Pumps Sectional Committee, ME 20
FOREWORD
This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards, after the draft finalized
by the Pumps Sectional Committee had been approved by the Mechanical Engineering Division Council.
This standard was first published in 1985 primarily for testing set up and procedures for agricultural pumps,
both for coupled and monoset types with aview tomake astandardized test setup and procedure available for
various testing laboratories so that results obtained are identical, of course, within certain limits.
Sincethen 4amendments were issued. With the revision ofvarious pump specifications and publication ofnew
standards on various types of pumps like centrifugal jet, engine monoset and openwell submersible pumps,
need was felt to revise the standard with a view to make a comprehensive testing code which may include all
types of agricultural and water supply pumps.
Procedures for acceptance testing of pumps as per IS 9137:1978 ‘Code for acceptance tests for centrifugal,
mixed flow and axial pumps — Class C’may also be foliowed atthe option of the pump manufacturers.
It is suggested that testing shall be stopped as soon as the frequency of input supply falls beyond permissible
limits. Evolving a correction factor maybe a difficult proposition. It isalso suggested that the testing shall be
done at rated voltage. The input voltage may be maintained at rated voltage with the help of variable voltage
transformer.
For the purpose of deciding whether aparticular requirement of this standard is complied with, the final value,
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with
IS2:1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained in
the rounded off value should be the same asthat of the specified value in this standard.
IS 11346:2002
Indian Standard
TESTS FOR AGRICULTURAL AND WATER SUPPLY
PUMPS — CODE OF ACCEPTANCE
(First Revision )
1 SCOPE e) Any other method permitted in IS 9137 or a
method using ahigher accuracy equipment.
This standard lays down broad basis for testing setup
andtestingprocedures foragricultural andwatersupply 3.1.2 Head Measurement
pumps conforming to the following Indian Standards:
a) Delivery head measurement by mercury
IS No. Title manometer or pressure gauge,
6595 (Part 1): Horizontal centrifugal pumps for b) Suction headmeasurement byvacuum gauge
2002 clear, cold water —-Specification: or mercury manometer, and
Part 1Agricultural and rural water
c) Head measurement by pressure transducers.
supply purposes (third revision)
8034:2002 Submersible pumpsets — 3.1.3 Power Measurement
Specification (second revision) a) One three-phase wattmeter or two single-
8418:1999 Pumps — Centrifugal self-priming
phasewattmeters forthree-phase motors, and
— Specification (fzrst revision)
b) One wattrneter for single-phase motors.
8472:1998 Centrifugal regenerative pump for
clear, cold water — Specification 3.1.4 Speed Measurement (see 3.2.4)
(jlrst revision)
3.2 Details of Apparatus
9079:2002 Electric monoset pumps for clear,
coldwaterforagricultural andwater 3.2.1 Measurement of Rate of Flow
supply purposes — Specification
Depending upon flowrate, following methods maybe
(second revision)
adopted.Volumetrictankmethod shallbeusedforflow
11501:1986 Engine monoset pumps for clear,
rate up to 20 Vs.
cold water for agricultural purposes
— Specification (fu-strevision) 3.2.1.1 Volumetric tank method
12225:1997 Centrifugal jet pump —
This method shall be used for flow rate up to 20 1/s.
Specification (first revision)
While using this method following points shall be
14220:1994 Open well submersible pumpsets —
considered:
Specification
2 REFERENCES a) For each observations, rise of water level in
collecting tankshallnotbelessthan300mm.
The standards listed at Annex A contain provisions
b) Collection of water shall not be for lessthan
which, through reference in this text, constitute
30 s. This duration shall be extended if
provision of this standard. At the time of publication,
required to observe (a).
the editions indicated were valid. All standards are
subject to revision, and parties to agreements based c) The time shall be taken with an accurate
on this standard are encouraged to investigate the stopwatch having least count of 0.5 sorless.
possibility of applying themost recent editions ofthe d) There shall be an arrangement for quickly
standards. switching the full flow into and away from
the measuring tank. Alternatively, if such
3 MEASUREMENTS
switching arrangement isnot there and flow
3.1 Methods ofMeasurements is continuously taken in volumetric tank,
height of same shall not be less than 1.2m.
3.1.1 Measurement of Rate of Flow
e) While collecting the discharge involumetric
a) Volumetric tank method (see 3.2.1.1), tank, manometric suction lift shall not vary
b) Vee-notch method (see 3.2.1.2), by more than 0.05 m.
c) Orifice plate method (see 3.2.1.3), f) Volumetric tankshallbeaccurately calibrated
byvolumetric method.
d) Flow meters (see 3.2.1.4), and
IS 11346:2002
g) During collection ofwaterinvolumetric tank, i) Thethickness ofthelipofthenotch shall
water level in sump shall be maintained by be 1.5mm with a bevel of 45° leading
makeupwater.Alternatively, sumpareashall downstream andwith the upstream edge
be large enough so as to limit the variation perfectly sharp. The face of the notch
of water level within 0.05 m. Table 1gives shallbesmooth andsetvertically atright
the minimum area of sump required for angles to the channel of approach and
various discharge ratessoastolimitvariation the sides of the notch shall be equally
of water level within 0.05 m. Table 1 also inclined to the vertical. A carefully
covers maximum area of volumetric tank so finished notch made from polished brass
as to ensure rise of water level in collecting plate or from acommercial steelplate is
tank as minimum 300 mm. recommended, but the former is to be
preferred. Rusting and pitting of the
Table 1Minimum Sump Area notch face may increase the discharge
[Clause 3.2.1.1 (g)] by as much as two percent above that
computed from the above formula. The
SI Maximum Minimum Maximum tolerances for the dimensions affecting
No. Discharge Sump Areaof the flow rates such as Vee-notch lip
Rate Area VolumetricTank
thickness, bevel angle, etc, shall be as
(1) :) ;; ;; per IS 2102 (Parts 1 and 2), medium
i) 1.5 0.9 0.15 grade.
ii) 5.0 3.0 0.5
ii) The head shall be measured at the sides
iii) 10.0 6.0 1.0
iv) 15.0 9.0 1.5 ofthe flume atadistance upstream from
v) 20.0 12.0 2.0 the notch, minimum four times the
maximum head to be measured. The
3.2.1.2 Vee-notch method
gauge shall preferably be placed in a
The Vee-notch provides a convenient method of separate chamber connected totheflume
measurement of discharge from 120 to 7200 l/rein. by apipe normal to the flume.
For small discharges, that is,from 120to2400 l/rein, iii) The depth from the apex of the notch to
a half 90° Vee-notch ispreferred. The half 90° Vee- the bottom of the channel shall not be
notch hashalftheareaofa90°Vee-notch, thedistance less than 150 mm on the downstream
across the top being equal to the vertical depth and side, while on the upstream side, itshall
the sides being symmetrical about the vertical axis. not be lessthan 300 mm for heads up to
230 mm or lessthan 450 mm for higher
The discharge of water over a half 90° Vee-notch is
heads.
half that over a 90° Vee-notch with the same head.
iv) The width of the channel of approach
Figure 1givesdimensions fora90°Vee-notch capable
shall not be lessthan 1.2m for heads up
of measuring rate of flow from 2 to 35 lis and up to
to230 mm and lessthan 1.8m forheads
60 1/s.Figure 1 also gives dimensions of the notch
up to 450 mm.
section, surface to be machined accurately, location
v) There shall be no projecting surfaces
of the notch with respect to vertical planes (see also
whatever either on the notch face or on
IS 9108).
the channel side, since these interfere
a) Formulae for volume rate ofjlow — The with the smooth flow of water to the
volume rate of flow shall be computed from notch.
the following equations: vi) Swirling of water in the approach
channel shall be prevented by-suitably
i) IftheVee-notch iscutinapolished brass
placing baffles upstream to the point at
plate:
which the head is measured.
Volume rateofflowinlls=H248120600
vii) The water level downstream may be
where H = head over the notch in
allowed torisewithin 25mmoftheapex
millimetre.
ofthenotch without affecting theresult,
ii) If the Vee-notch is cut in a sheet of butshallnotbeallowed toriseabovethis
commercial steel plate: level when measurements are being
Volume rateofflowinM=H247/19150 taken.
b) Precautions — For accurate results, the viii) Gauge zero shall be determined as
following precautions shall be taken: per 10.3.3 of IS 9108,

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IS 11346:2002
200
‘-” & r;iw’”
t)RAIN
<
“4a--J \-
FLOAT CHAMBER FOR
MEASURING HEIGHT
OVER NOTCH
3
1.5
E
45”+45°
ER ,x
F
x
e u
LL-
240X240 12
DETAIL OF VEE-NOTCH x-x
Dimensions For Flow Rates For FIow Rates
2kk to 60 i/S 21kto35i/s
A 2700, A-fin 2200, &fin
B 1800, Min 1200, Min
c i 150,&tin 1000, Min
D 810, A4in 600, Min
E 720, Min 600, Min
F 360, Min 300, Min
I Twofloatingwoodenplanksl 1600x 200 loo(rxzo(j
screen/perforatedplates I
Alldimensionsinminim-s.
FIG. 1MEASUREMENTOFRATEOFFLOW

3
IS 11346:2002
c) Limits of accuracy — If every care is 3.2.2 Head Measurement
taken with the setting and reading of
a) Delive~ head — A mercury manometer or
gauges, with the construction of notch
pressure gauge shallbeused forthispurpose.
andthechannel ofapproach, thismethod
shall give the rate of flow within +1.5 b) Suction head — For this purpose a vacuum
gauge oramercury manometer shallbeused.
percent accuracy.
3.2.2.1 Pressure transducers, if used, shall be of
3.2.1.3 Orljlce plate method
suitablerange formeasuring suction headanddelivery
The flow rate may be measured by orifice plates as head.
indicated in IS 2952 (Part 1).
3.2.2.2 Instead of mounting gauges directly on the
3.2.1.4 Flow meters pipes, they shall be placed on separate stand.
Theflowratemaybemeasured byusing thefollowing 3.2.2.3 Precautions and connections for the gauges
flow meters:
a) For suction lift value, a mercury manometer
a) Turbine type flow meter, or a vacuum gauge shall be connected with
b) Vortex typeflowmeter, tapping made inthe suction line asshown in
c) Rotary piston type flow meter, and Fig. 2and the same maybe connected to the
tapping point by flexible hose preferably
d) Magnetic flow meter.
transparent. However, thedimension 4D,Min
DELlVERY PIPE
THROTTLE VALVE
6D min.
DELlVERY GAUGE
TO DISCHARGE
MEASURING
VACCUM GAUGE/MANOMETER DEVICE
1
2D
SUPPORT STAND
1 I
0.6m min. AT
SUCTION ~ ZERO DiSCHARGE
.-------- --------.
----
Sumparea = Delivery/Volumetritcankam
D = Normalpipedia
FIG. 2 TYPICALTESTSETUP FORNON-SELF-PRIMINGPUMPS

4
IS 11346:2002
shall in no case exceed 1.5m. The nominal 3.2.3.2 Wattmeter used for power measurement shall
diameter ofthe suction pipe shall beequal to be of accuracy class 1.5 or superior. For type test
the size of the pump suction. wattmeter shall be of accuracy class 0.5.
b) For the value ofthedelivery head, abourdon
3.2.3.3 Fuel consumption
type pressure gauge or mercury manometer
shall be connected to the delivery line with Onepipette and stopwatch should beusedtomeasure
tapping as shown in Fig. 2. However, the fuel consumption when pump is coupled with diesel
dimension 4D,Min shail in no case exceed engine.
1,5m.Thenominal diameter ofdelivery pipe
3.2.4 Speed Measurement
shallbeequaltothedelivery sizeofthepump.
Here again the gauge or manometer shall be 3.2.4.1 The speed shall be measured by amechanical
connected to the tapping point through a or optical tachometer.
flexible hose preferably transparent.
3.2.4.2 The accuracy of the tachometer shall be 1.4
c) When bourdon type gauges are used, they
percent or superior.
shall be of suitable range for the heads to be
measured (the gauge range shall be about 3.2.4.3 Inthe caseof immersed pumps, speed maybe
twice the maximum head tobe measured). It measured by slip-coil method/magnetic pick up
is recommended that the drain cocks be method. In case of slip-coil method, total number of
placed immediately belowthegaugesandthat turns in coil shall be sufficient enough to get
frequently testsbemadetodetermine whether adequately powerful signals. It shall be connected
pipe connections ofthe gauge are filled with through a galvanometer/slip meter. For a specific
water. With this form ofgauge, care shall be duration of time, slip is to be counted and corrected
takentoeliminate anyleaksintheconnecting forthesupplyfrequency ortheslip-coilmaybe directly
pipes a~d to avoid the trapping of air in the connected to the display meter for reading the slip
connecting pipe or hose. and/or rpm.
Inthe case of gauges fitted for measurement
3.3 Calibration of Apparatus
of suction vacuum, itshould be ensured that
the connecting pipe isfree of water. All instruments to be calibrated periodically at a
frequency tobe decided by the instrument user.
d) The gauge, when calibrated and used, shall
beinanupright position. Onnoaccount shall NOTE—Calibrationofvolumetrictank,Vee-notch,orificeplate
any bourdon type gauge be fixed sothat any andvenhrrymetershallbebygeometricalmeasurementsand
strain is placed on its case, as its readings deemedtohavebeenmet,iftheymeetthespecifiedrequirements
asgiveninrelevantstan&rds.Forgeometricalmeasurementsof
maythereby beseriously affected.
Vee-notchIS9108shallbereferred.
e) The end of the connecting tube orpipe shall
be flush with the inside of the conduit in 4 TEST SET UP
whichthepressure istobemeasured andshall
An illustrative test setup isshown inFig. 2.Asfar as
have its axis at right angles to the direction
possible; the test set up shall conform to the model
Offlow.
test setup. However, the water level inthe pump and
the location of throttle valve and gauge connection
3.2.2.4 Limits of accuracy
shall conform toFig. 2.
Accuracy within+1percent shallbeexpected,provided
the above precautions areobserved carefully. 4.1 Precautions
3.2.3 Measurement of Power Input a) In case of direct coupled pumpset, proper
alignment shall be ensured.
A three-phase wattmeter or two single-phase
b) Airtightness insuction line shallbeensured.
wattmeters shall be used for measuring power input
to the three-phase motor. c) The offset pipe of suction line shall either be
horizontal or inclined upward towards the
3.2.3.1 Incaseofdirect coupled pumps, pre-calibrated
pump and shall never be inclined downward
motors for testing shall be used. Motor output shall
towards the pump to avoid air trapping.
be treated as pump input. For monoset pumps
d) Whenmanometer isusedtomeasure vacuum
(see IS 9079), submersible pumpsets (see IS 8034)
atsuction, itshallbeconnected tothesuction
and openwell submersible pumpsets (see IS 14220)
pipe through atransparent tube. During each
input to motor itself is taken to derive the overall
observation it shall be ensured that there is
efficiency.
no water column in the tube.

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