Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 5639 (1970): Pumps Handling Chemicals and CorrosiveLiquids [MED 20: Pumps]

IS : 5639 - 1970

Indian Standard SPECIFICATION FOR

PUMPS HANDLING CHEMICALS AND CORROSIVE LIQUIDS

Pumps Sectional Committee, EDC 35

Chairman

SHRI P. N. MENON

Members

Refirestnting

Best & Co Private Ltd, Madras

SHRI K. SRINIVA~AN ( Alternat to Shri P. N:Menon )

SHRI NANU B. AMIN Jyoti Ltd, Baroda SHRX P. L. JAIN ( Alternate )

l SHRI K. ASOKAN Engi;rega;g Association of India, Calcutta; and Pump Manufacturers Association,

Calcutta SHRI A. C. GUPTA ( Alternate ) Engineering Association of India, Calcutta SHRI B. P. MITTAL (Alternate ) Indian Pump Manufacturers Association, Calcutta

SHRI BALWANT SINGH Water Supply and Sewage Disposal Undertaking, Municipal Corporation of Delhi

SHRI M. M. PATEL ( Alternate ) SHRI J. R. BAMMI Johnston Pumps India Ltd, Calcutta SHRI R. BARATAN Department of Industries, Labour & Housing,

Government of Tamil Nadu LT-COL BHAGAT SINGH Ministry of Transport & Aviation SHRIA.CAV~NATHAN Bharat Heavy Electricah Ltd, Tiruchirapalli CHIEF ELECTRICAL ENGINEER Northern Railway, Ministry of Railways

SENIOR ELECTRICAL ENGINEER (M) ( Altcmafc ) Public Works, Workshops & Stores, Government of GENERAL SUPERINTENDENT

Tamil Nadu - Central Equipment and Stores Procurement

Organization, Government of Uttar Pradesh Kirloskar Brothers Ltd, Kirloskarvadi

Ministry of Defence ( R & D )

Neyveh Lignite Corporation Ltd, Neyveli Directorate of Industries, Government of Maharashtra

Directorate General of ‘l’echnical Development ( Ministry of Industrial Development, Internal Trade & Company Affairs )

SHR~ JAGAN MO~XAN

SHRI M. A. JALIHAL SHRI S. G. PHATAK (Alternate )

COL P. N. KAPOOR MAJ B. S. MALHI ( Alternate )

SI<KI K. ~RISHNRMURTffY SfrRf P. M. NAIK

Sirat S. Y. TIPNIS ( Alfcrnatc) SIIRI K. S. PRAR~IAKAR

“Shri K. Asokan is also alternate to Shri J. R. Bammi.

( Continued on page 2 )

INDIAN STANDARDS INSTITUTION MANAK BHAVAN, 9 BAHADUR SHAH ZAPAR MARCi

NBw DFLHI 1 lfJO@

I84 5639 - 1970

( Continuedfiom puge 1 )

MO78bWS Re~esmfing

REPRESENTATIVE PROP K. SBETHARAMLW

Ministry of Food & Agriculture

S-I C. M. Sxux Indian Institute of Science, Bangalore Tata Chemicals Ltd, Mitha’pur

SHRI B. T. DEVANATHAN ( Al&mate ) SHRI C. V. J. VARMA Central Board of I ’

Y ation & Powa

SHRI S. N. VOHRA Directorate Genera of Supplies oc Diaposalr

SHRX R. M. GANPULE ( Ahmate) ( Ministry of Foreign Trade & Supply)

Smu M. V. PATANXN~, Director ( Mech Engg )

Director General, IS1 ( E*-o&iu Member)

SHRt s. CtiANn-

Deputy Director ( Mech Engg), ISI

Special Purpose Pumps Subcommittee, EDC 35 : 5

SEXRI M. A. JALUUL

Mnnbcfs

Kirloskar Brothers Ltd, Kirkkarvadi

SHRI S. G. PHATAK ( Altmat.s to Shri M. A. Jaliial )

Sxnu S. K. BATIU D.C.M. Chemical Works, Delhi DR R. K. GUPTA ( Altern& )

SHRI 8. N. BHA=ACHERJEB British Electrical & Pumps Pvt Ltd, Calcutta SARI P. K. MUXHERJI ( dl&mu& )

SH~U S. K. Guw Century Rayon, Bombay Sxnu J~ROESHCHANDRA ( Alkrnuk )

Smut H. J. HANKB KSB Pumps Ltd, Bombay SHRI P. L. JNN Jyoti Ltd, Baroda

S~nr K. s. PATEL ( Altmutr) f&RI B. P. MITTAL Flowmore Pvt Ltd, New Delhi

SHRI K. >G. %A- ( Alkmaie ) SERI MAJEED MOXIU~D~N Orient Paper MiIla Ltd, Calcutta Smu J. P. MUICHBRJBB Walchand Nagar Industries Ltd, Poona SHIU V. B. K. M~RTHY National Coal Development Corporation Ltd, Ranchi

.%nu M. B. TAWADEY ( Al&mate ) SEIRR S. T: N- Mathcr C Platt Ltd, Bombay

Snot K. IYENQER ( Alkmak ) slm v. s. PILLAl Fqtilizcrs and Chemicala Travancore Ltd, Kerala

SHRI S. PADUANABHAN ( Alkmok ) Smu K. hMANATHAN Met%=1 and Industrial Corporation Ltd,

&Rx P. s. ROY Bird h Co Pvt Ltd, Calcutta Sznu N. M. SARAWA Dorr Oliver ( India ) Ltd, Bombay PRO@ K. S~THAUMUH Indian Institute of Science, Bangalore Smu K. SRINIVAMN Bat & Co Primte Ltd, Madras

(ColPrauanWI5)

2

IS : 5639 - 1970

Indian Standard SPECIFICATIO~N FOR

PUMPS HANDLING CHEMICALS AND CORROSIVE LIQUIDS

0. FOREWORD

0.1 This Indian Standard was adopted hy the Indian Standards Institution on 4 May 1970, after the draft finalized by the Pumps Sectional Committee had been approved by the Mechanical Engineering Division Council.

0.2 Chemicals and corrosive liquids are used iu different industries, such as chemicbl, textile, paper, fertilizers, petro-chemicals, sugar, dye stuffs, steel, etc. L&n this standard various chemiralr; and Corrosive liqllids are specified and the requiremenls for centrifugal and rotodynamic pumps for use with such liquids are laid ROUX.

0.3 The technical requirements for cenLrifFga1 and rotodynamic pumps covering wide range including definitions, umts, classes and types of pumps, effect of viscosity, specific gravity and other effects on the performance of pumps material of construction, salient design features, testing procedures, tolerances and guarantees are already included in IS : 5120-1968*.

0.4 For the purpose of deciding whether a particular requirement of this standard is complied ,with, the final value, observed or calculated, expressing the result of a test, shall be rounded off in accordance with IS : 2-1960-t. The number ofsignificant places retained in the rounded off value should be the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard specifies the technical requirements for rotodynamic pumps ( such as centrifugal, axial flow, mrxed flow, turbo pumps, etc ) for handling chemicals and corrosive liquids.

2. UNITS, TERMINOLOGY AND CLASSIFICATION

2.1 Units, terminology and classification relating to pumps for chemicals and corrosive liquids shall be as specified in IS : 5120-l 968*.

*Technical requirements for rotodynamic spcclal purpose pumps. tR&s for rounding off numerical values ( ~cciscd 1.

3

IS: 5639 - 1970

3. CHARACTERISTICS OF CORROSIVE LIQDS

3.1 A corrosive liquid is one having any one of the characteristics specified below:

a) PH value Less than 6 or more than 8

b) Turbidity 10 000 ppm, Max

c) Solid content IO percent, Max

d) Solid size 3 mm, Max

e) Temperature Minimum 0°C to 250°C maximum

3.2 Characteristics of chemicals and corrosive liauids met within different industries in India are given in Table 1.

4. NOMENCLATURE

4.1 Nomenclature of the parts commonly used in rotodynamic pumps chemicals and corrosive liquids shall be as given in IS : 5120-1968*.

5. BALANCING

for

5.1 The major rotating parts, like impellers, the balancing drums, etc, shall be suitably balanced so as to prevent undue vibrations under normal operating conditions.

NOTE - In case where limiting of the undue vibrations 1s essential, this shall be sepa- rately agreed to between the purchaser and the supplier.

6. MATERIAL OF CONSTRUCTION

6.1 It is recognized that a number of materials of construction is available to meet the needs for pumps handling chemicals and corrosive liquids. Recommended materials of construction for the pumps handling. chemicals and corrosive liquids used in different industries are given in Tables 1 and 2.

Wrought materials such as for shaft may be either of similar composition to the castings used or suitable shaft protection should be provided against corrosion. Most of the parts are primarily castings.

6.2 Gaskets, Seals and Packings - Gaskets, seals and packings used for pumps handling chemicals and corrosive liquids shall conform to those specified in IS : 5120-l 968*.

*Technical requirements Car rotodynamic special purpose pumps.

4

TABLE 1 -CTF,lUSTIcS OF DIFFERENT CHEMICALS AND CoRROSIye LIQUIDS ANDMA- OF CONSTRUCTION FOR THE PUMPS

(Clauws 3.2 and 6.1 )

FORMULA ChTXlTON #H SPEcrFxC MATERULOP OrLrQUxD VN.UE GRAVITY ChCiTRUClTON

(SrrT.uws2)

FLUID SRAL ikLEct-10~ No. (See IS : 5120-

196fP )

(1)

Acetic anhydride

Acid, acetic

Acid, boric

WI Acid, citric

Acid, formic

Acid, hydrochloric

Acid, hydrofluoric

Acid, nitric

Acid, oxalic

Acid, phosphoric

(21 (3) (4) (5) (6) (7)

W-W'3 - - 1.08 (13), 10 and 15 -

WW, Cone, cold - l-05 (13), 10 and 15 -

HaBO3 Aqueous solution - - (3), 5, 10 and 11

ww?~~,O Aqueous solution - - (3), 5,13 and 15

<=H,O* - - 1.22 (lo), 3 and 5

HCI coml, COLIC - 1.19 (7), 6,9, 12, 13 7 Dil, cold (38%) and 15

HF Aqueous solution - - (3) and 6 -

mo3 Cone, boiling - 1.5 (5), 7, 12 and 15 7

WW'u, 2&O Cold - 1.65 (5), 13 and 15

H3PO4 - - 1.87 (13), 5 and 10

NOTE - In col 6, numben in brackets indicate the best suited material.

*Technical requirements for rotcdynamic special purpose pumps.

Alummium sulphate &W4)3

Ammonium carbonate WH4)2C03

Ammonium chloride NH4Cl

Ammonium nitrate NH4N03

Atn,nz,tm phosphate, . .

Ammonium sulphate

Aniline

Barium nitrate

v Brine, acidic

Brine, alkaline

Brine, calcium chloride

Brine, calcium chloride

Brine, calcium and mag- nesium chloride

Brine, calcium and sodium chloride

Brine, chilling

tm4)2HP04

WUsSO4

CsH,N

Ba(NW s

-

-

CaC12

CaCls

-

-

-

Aqueous solution

Aqueous solution

Aqueous solution

Aqueous solution

Soln, crystallizing temp 120%

Aqueous solution

Aqueous solution

-

Aqueous solution

-

-

-

-

Aqueous solution

-

-

-

-

-

-

-

-

-

-

-

-

>i

<8

-

NOTE - In co1 6, numbers in brackets indicate the best suited material.

*Technical requirements for rotodynamic special purpose pumps.

_-

-

1.43

-

-

I.02

-

-

-

-

-

-

(5), 6, 11 and 15 5

(lo), 2, 7 and 15 -

(13), 5,6,11 and 15 5

(2), 5,6 and 13 5

(5), 2, 6, 11 and 13 5

(2), 4, 5 and 11 5

(2) and 1 -

(6), 2, 5 and 11 -

(7) and 5 -.

(2) and 5 -

(2) and 7 4

(~~d4i16, 7, 10 4

(3), 4,6, 11 and 14 4

(3), 4,6, 11 and 13 4

b:

(2)

s TABLE 1 CHARACTERISTICS OF DWFERENT CHEMICAIA AND CORROSIVE LIQUIDS

-- AND MATEIUALS OF CONSTRUCTION FOR THE PUMPS - Cmrd

FORMULA ~NDITXON OF L&p0

PH SPECIYIC ~MATERlAL OF FLLW

ill

Brine, sodium chloride

Brine, sodium chloride

Calcium hypochlorit-

Carbon bisulphidz

z

Carbamate

Condensate

Copper sulphate

Fatty acids

Ferric chloride

Ferrous chloride

Ferrous sulphate

Gasoline

Glycerol ( glycerine j

(2) (3)

NaCl Under 3% salt, cold

NaCl Over 3% salt, hot

Ca(OCljz

CS2

NH+!0 to 50’+& 1 coo--IO to 15% ) H20---85 to 70% J

-

.-

-

Solution with dissolved CO2

~:uSO~ .4queous solution

- -

E&la Aqueous solution

FeClz Cold, aqueous solution

FeSO, Aqueous solution

- -

C,%(OHj, -

VALUE GRAVKlT

(4) -

"-

-

-

-

-

-

-

-

-

-

-

-

(5) -

142-1.2 ( cold )

-

1.26

095

I.0

-

-

-

-

@68-0+75

1.26

~NSTRUCnON

(&TAB= 2)

(6) (3), 2, 4, 7 and iI

(7) and 3

(15), 2, 5 and 10

(3)

(5)

(5)

(5), 10, 13 and 15

(5), 3, 6 and I3

(IO), 13 and I5

(15) and 13

(15), 5 and 10

(2), 1 and 5

(3). 1, 2 and 5

I;: SEAL _

(7) 4

4

-

3

IO

5

-

7

-

4

3

Hydrogen peroxide HsOa

Lime water ( milk of lime ) Ca(OH)a

Magnesium chloride MgCls

Magnesium sulphate Me304

Nickel chloride NiClp

Nickel sulphate NiSO,

Nitric acid HNO8

Naptha -

Potash -

Potash alum

v,

Potassium hydroxide KOH

Potassium carbonate K&OS

Aqueous solution

-

Aqueous solution -

AqueoGs soiution

- -

-

Clear solution -

Liquid with dissolved I&3 -

Plant liquid -

Aqueous solution -

Aqueous solution -

- -

- - Potassium caibonate acti- K&Oa acti- vated with.dtca vated with

anenite

Elenol CsH,OH - -

Pyridine C5I-W -

Potassium permanganate KMnO, - -

NoTB - In col6, numbers in brackets indicate the be& 5uitcd mataid.

*Technical requiremeuts for rotodynamic bpecial purpose pumps.

(3) and 13 -

- (2), 5 and 13 4

- (lo), 5 and 13 -

(2), 5, 13 and 10 -

- -

-

1.1 to 1.3 (5) 10

@6

-

-

I*35

1.33

1.07

OS

-

(5) 10

(3),4,5,6, lfand 17 6

(3), $6, 11 and 15 6

(2194, 5,6, and 12 6

5 10

(5) 5

-

(5) 6

TABLE 1 CHARACTERISTIcs OF DW -c&S AND CQRRQSIVE LIQUIDS E

FLUID

AND MATERIALS OF CONSTRUCZTON FOR TEiR PUMPS - Cbntd

FORMU LA

-

(1) Potassium sulphate

Steam condensate

Soap liquor

Soda ash

;; Sodium bicarbonate

Sodium hydroxlcie

Sodwm sulphate

Sodium carbonate

Sodium nitrate

Zinc chloride

Zinc.sulphate

Urea solution

(21 SW4

-

-

NatC03

NaHC03

NaOH

KazS04

P‘;a2COR

NaNOs

ZnCls

Z&O4

-

CONDITION OF LrgJnl

PH SPECIFIC VALUE GR4Wl-V

(3) Aqueous solution

vemperature around 100°C

-

cold

Hot

Aqueous solution

Aqueous solution

Aqueous solution

-

Aqueous solution

Aqueous solution

Aqueous solution

75% solution above 90°C but crystallizes at lpsser temperature

(4) (5) - -

- 1.0

- -

- -

- -

- -

- -

- -

- -

- -

- -

- -

- 1.15

Dora - In co1 6, numbers in brackets mdlcate the best sulted material.

*Technical requirements for rotodynamic special purpose pumps.

MATERIAL OF

tiNSTRUCllON (See TABLE 2)

(6) (7), 3, 5 and 10

(2)

(2), 4 and 5

(2) (4), 5 and 6

(2), 4 and 5

(5), 2, 4, 6 and 12

(3), 5 and 12

(2)

(2), 4, 5 and 13

(6), 3, 7, 10 and 13

(3), 5, 6, 7 and 11

5

(7) -

5

4

4

9”

-

5

5

4

-

7

7

5

ls:3639-1970

TABLE 2 ‘MATERIALS @F CONSTRUCTION FOR PUMPS HANDLtNc CR@MICALS m CORROSWJZ LIQUIDS

( CIausc 6.1 )

SELECITON No.

1.

2.

3.

4.

5.

6.

7.

a. 9.

10

11.

12.

13.

14.

15.

kiA=RIAL OF tkWTRtICTION RELEVANT SPECIFICOION

Brornte fitted

All i&r

All bronze

All austenitic iron

All stainless steel

All monel metal

Grade V of IS : 318-1962’

Grade 20 of IS : 210-19627

Grade V of IS : 318-1962+

Type 2 of IS : 2749- 1’9643

Schedule V of IS : 1570-19615

Ni - 63% cu - 30%

zn-_2zg%

Si - 4%

Rubber lined

l\‘hite iron

Graphite

Hastelloy

Nickel cast iron

Aluminium porcelain

Chlorimet-3

Antimonial lead ( Hard lead )

High silicon cast iron

Tensile stress - 60 kgf/mms Elongation on 5d - 20 to 10% Brinell hardness - 275 to 300

Spqification to be included later11

IS : 2107-19627

Specification to.be included later11

Ni - 82% Cr - 18%

Ni--7 to2% Iron - remainder Tensile stress - 18 kgf/rnm’ Specific gravity --‘7*3 kg/ems

Electrical porcelain containing ap- proximately 50% aluminia oxide ( A1203 1

Ni - 60% Cr - 18% 1Mo - 18% Remainder - Fe, Si, C

Pb - 94% Sb - 6%

Si -15% Remainder -Fe,C,Mn

*Specification for leaded tin bronze ingots and castings ( revised ).

)Specification for grey iron castings ( rerhed ). ( Second revision in 1970 )_

&ecification for austenitic iron castings.

@chedules for wrought steels for general engincermg purposes.

IlSpecifications for these have not yet been formulated and whenever these and other materials not included in the list are required, they shall form the subject of a separate

agreement between the supplier and the purchaser.

ljSpecification for whiteheart malleable iron castings.

11

ISr!w9-1970

7. DESIGN Fl3ATuRJ.B

7.1 Flange Connections - For pipe connections smaller than 50 mm, threading or joints by flanging may be provided, while flanges shall be provided for pipes 50 mm or larger. The flanged suction connection shall be designed for the same pressure as the discharge flanges at the operating temperatures consistent with hydrostatic test pressure. Unless required by the purchaser, the tapped openings shall not be furnished in high velocity areas of the pumps like suctiqn and discharge volutes; and in case of pumps handling acids or other hazardous liquids, no tapping in these areas shall be provided.

7.2 Nozzles and Miscellaneous Connections - In case of fluids having crystallizing properties at a particular pump temperature like urea solution, steam jacketing around suction nozzle shall be provided to prevent the liquid from being crystallized during operations.

7.3 Wearing Ring - In respect of wearing rings, it was decided to indi- cate that the casing shall be provided with wearing rings while in respect of the impellers, this would depend upon the design.

7.4 Running Clearance - Sufficient running clearance between wearing rings and between other moving parts shall be such so as to prevent seizure under the operating conditions of temperature, suction conditions, etc. A shaft sleeve or a hard facing of the shaft surface may be provided.

7.5 Sealing Arrangements - Stuffing boxes having conventional pack- ings shall be of sufficient depth so as to prevent leakage within the.pump casing of the fluid being handled. This should also ensure replacement of the packing without dismantling any part other than the glands. The use of suitable packings without involving lubrications may also be employed and wherever possible, the use of mechanical seals is recommended.

7.6 Bearings - Radial bearings of standard design ( ball, roller or sleeve type ) shall be prcvided. Suitable thrust bearings shall also be provided to take up axial’thrust where required. The bearings shall have a rated life for continuous operation at the rated pump conditions of 25 000 hours and shall, in no case, be less than 16 000 hours at maximum axial and radial loads at rated speed. The bearing housings shall be effectively- sealed against the entrance of water or dust and shall have drain plug at the bottom of each housing.

8. DIRJXTION OF ROTATION

8.1 The direction of rotation of pumps is designated clockwise or counter clockwise as observed when looking at the pump shaft from the driving end

8.2 The direction of rotation shall be clearly marked either by incorpo- rating an arrow in the casting or by a separate metal plate arrow securely fitted to the pump.

12

IS:!x39-1970

9. ACCESSORIES

9.1 In addition to essential and optional accessories specified in IS : 5120- 1968* provision shall be made for fitting the auxiliary pipings such as indicated below:

4

W

4

4

Stuffing box cooling connections shall be provided when tempera- ture of the chemical liquid exceeds 95°C.

Bearings shall be provided with cooling connections to main- tain their temperature below 80°C.

Vacuum equaliser connections should be-provided when pumping from suction vessels under vacuum.

Sealing connections should be provided to lantern rings in stuffing boxes.

10. SUCTION LIMITATIONS

10.1 Suction limitations affecting the performance of- the pumps handling chemicals and corrosive liquids are the same as those specified in IS : 5120-1968*.

11. FACTORS AFFECTING PUMP PERFORMANCE

11.1 Factors affecting the pump performance are the same as tnose speci- fied in IS : 5120-1968*.

12. INFORMATION TO BE SUPPLIED BY THE PURCHASER AND THE SUPPLIER

12.1 The information to be suppied by the purchaser and the sunplier shall be as specified in IS : 5120-1968*

13. PUMP TESTS

13.1 Pump tests shall be the same as those specified in IS : 5120-l 968*.

14. DETERMINATION OF PUMP PERFORMANCE

14.1 The determination of the pump performance shall be in accordance with the method specified in 14 of IS : 5120-1968*.

*Technical requirements for rotodynamic special purpoac pumor.

13

IS : 5639 - I970

15. NPSH TEST

15.1 The NPSH test may be performed at the duty point by any of the generally accepted methods.

16. GUARANTEES

16.1 Guarantee of Workmanship and Material - The pump shall be guaranteed by the manufacturer against defects in material and workman- ship, under normal use and service, for a period of at least one year.

16.2 Guarantee of Performance -The supplier shall indicate the working range of the pump and the performance of the pump shall be guaranteed at a specified point of rating only and shall not be guaranteed to cover the performance of the pump under conditions varying therefrom or for a sustained performance for any period of time

If the purchaser so desires, the manufacturer shall guarantee the non- over load of the prime mover for variations in the head in the working range. In the case of pumps where acceptance test cannot be conducted on the liquids for which the pump is designed, the manufacturer shall indicate the liquid performance of the pump based on the results of the tests conducted by him on the pump with water and interpolated as ex- plained in IS : 512Or1968*.

16.3 Unless specified otherwise, pump performance figures shall be deemed to be applicable for 4.5 m suction lift at mean sea level and at a water temperature of 30°C.

16.4 Suction lift is to be reduced for higher altitudes at the rate of l-5 m for every 1 000 m above mean sea level.

17. TOLERANCES

17.1 In all commercial acceptance tests of pumps, a certain tolerance shall be allowed ‘to the manufacturer on his guarantee to cover inaccuracies of the equations for discharge, errors of observations and unavoidable minor inaccuracies ofthe instruments employed.

17.2 A tolerance of f2.5 percent shall be permissible on the discharge. However, for small discharge up to 900 litres per dnute, a tolerance of +2-5 percent or +24 litres per minute, whichever is higher shall be allowed while the negative tolerance of 2.5 percent is maintained.

17.3 The percentage pump efficiency shall be not less than the specified value by more than 2.5. This tolerance may be iaised to 5 in case the prime mover does not get overloaded,

*Technical requirementa for rotodyntic aped purpac pump.

14

IS : 5639 - 1970

18. SPECIAL FEATURES

18.1 In case of more than one duty point, the performance range is to be indicated and the prime mover should be of sufficient power to take entire load in this range. Head restrictions shall be indicated in the name plates to avoid overloading ofthe prime mover.

18.2 For working in parallel, pumps should be with stable head capacity characteristics.

18.3 To prevent overheating of multi-stage pumps at full close pressure, an orifice, suitably designed, is recommended on the discharge side to maintain certain minimum flow. Balancing fluid leakage action should also be provided with balancing disc.

18.4 Provision shall be made for centre support for compensating thermal expansion while pumping liquids.

19. GENERAL REQUIREMENTS

19.1 The general requirements, covering the pumps for chemicals and corrosive liquids, shall conform to IS : 5120-1958*.

*Technical requirements for rotodynamic special purpose pumps.

( Conrinuedfrom page 2 )

Chemical Handling Pumps Panel, .EDC 35 : 5/P-2

Convener Representing SHIU P. L. JAIN .Jyoti Ltd, Baroda

Members SHRI K. S. PATEL ( dltarnote to

Shrj P. L. Jain ) SHIU K. Asolwv Johnston Pumps India Ltd, Calcutta SHRI S. K. BATS Delhi Cloth Mill Chemical Works. Delh

DR R. K. GUPTA ( Alhrnots ) Sx-m V. K. Dtxsxrr Indian Dye-Stuff Industries Ltd, Bombay

SHRI M. R. DIVHOHA ‘( &rmok ) SHSU H. J. HANKB KSB Pumps Ltd, Bombay St.mt M. A. JALIML Kirloskar Brothers Ltd, Kirloskarvadi

&i&U S. G. PHATAIC ( A&4fl8& ) SwuVr~erB.KRnr,fI

S~~R.J.MANKAD(A~~~~~~~) Akey Induatria, Bombay

&&A TS&mmN E

Orient Paper Mills Ltd, Calcutta

S~~.K.PUNWANI(A~~) Dorr Oliver ( India) Ltd. Bombay

!+l~nr~H. S. SHAH Wet Coast Pupcr Mills Ltd, North Cmara Smu G. D. MAHESHWARI i &rnat#

SHRt s. c: SW s. 4. Engineering Co, Bombay

15