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IS : 12235 (Parts 1 to 11) - 1986(Reaffirmed 1998)

Edition 1.1(1999-08)

B U R E A U O F I N D I A N S T A N D A R D SMANAK BHAVAN , 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Price Group 8

BIS 2003

Indian Standard

METHODS OF TEST FOR UNPLASTICIZEDPVC PIPES FOR POTABLE WATER SUPPLIES

(Incorporating Amendment No. 1)

UDC 621.643.2 [678.743.22] : 628.1 : 620.1

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IS : 12235 (Parts 1 to 11) - 1986

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C O N T E N T S

Page

F OREWORD 3

IS : 12235 M ETHODS OF T EST FOR U NPLASTICIZED PVC P IPES FOR P OTABLEW ATER SUPPLIES

Part 1 Measurement of Outside Diameter 4

Part 2 Measurement of Wall Thickness 5

Part 3 Test for Opacity 6

Part 4 Determining the Detrimental Effect on the Composition of Water 8

Part 5 Reversion Test 9

Part 6 Stress Relief Test 10

Part 7 Resistance to Sulphuric Acid 11Part 8 Internal Hydrostatic Pressure Test 12

Part 9 Impact Strength at 0C 13

Part 10 Method for Determination of Organotin as Tin Aqueous Solution 15

Part 11 Extractability of Cadmium and Mercury Occurring as Impurities 17

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As in the Original Standard, this Page is Intentionally Left Blank

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IS : 12235 (Parts 1 to 11) - 1986

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Indian Standard

METHODS OF TEST FOR UNPLASTICIZED

PVC PIPES FOR POTABLE WATER SUPPLIES0. F O R E W O R D

0.1 This Indian Standard (Parts 1 to 11) wasadopted by the Indian Standards Institution on20 August 1986, after the draft finalized by theSanitary Appliances and Water FittingsSectional Committee had been approved by theCivil Engineering Division Council.

0.2 This standard has been formulated tospecify methods of test for evaluating physicaland mechanical properties of unplasticizedPVC pipes for potable water supplies. The firstten parts of this standard were earlier includedin IS : 4985-1988*. For the sake of convenienceas well as for keeping them up to date, thesetest methods have been separated fromIS : 4985. Part 11 is newly added method of test.

0.3 In formulating this standard due weightagehas been given to international co-ordinationamong the standards and practices prevailing in different countries in addition to relating it

to the practices in the field in this country. This

has been done by basing Part 11 on thefollowing International publication.

ISO/DIS 6992 Unplasticized polyvinyl chloride(PVC) pipes for drinking water supply Extractability of cadmium and mercuryoccurring as impurities, issued by InternationalOrganization for Standardization.

0.4 This edition 1.1 incorporates AmendmentNo. 1 (August 1999). Side bar indicatesmodification of the text as the result of incorporation of the amendment.

0.5 For the purpose of deciding whether aparticular requirement of this standard iscomplied with, the final value, observed orcalculated, expressing the result of a test oranalysis, shall be rounded off in accordancewith IS : 2-1960*. The number of significantplaces retained in the rounded off value shouldbe the same as that of the specified value inthis standard.

*Specification for unplasticized PVC pipes for potablewater supplies ( second revision ). *Rules for rounding off numerical values ( revised ).

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IS : 12235 (Part 1) - 1986

4

Indian Standard


PVC PIPES FOR POTABLE WATER SUPPLIESPART 1 MEASUREMENT OF OUTSIDE DIAMETER

1. SCOPE

1.1 This standard (Part 1) covers the methodfor measurement of outside diameter of unplasticized PVC pipes manufacturedaccording to IS : 4985-1988*.

2. MEAN OUTSIDE DIAMETER

2.1 Required Precision The precisionrequired in each measurement is 0.1 mm.

2.2 Principle The determination of thecircumference of the pipe and division by3.142 .2.2.1 A Pitape with an accuracy of at least0.05 mm shall be used for the directmeasurement of the mean outside diameter.2.3 Measuring apparatus shall be an ordinaryflexible tape or flexible tape suitably calibratedto read diameters directly. This tape shallcomply with the following requirements:

a) It shall be made of stainless steel or someother suitable material,

b) It shall permit the reading to the nearest0.05 mm,c) It shall be graduated in such a way that

neither its own thickness nor thethickness of the graduation has anyinfluence on the result of themeasurement, and

d) It shall have sufficient flexibility toconform exactly to the circumference of the pipe.

2.4 Procedure Apply the tape on the wholeof the circumference perpendicular to the axisof the pipe. The reading shall be taken onlyunder these conditions.

2.5 Expression of the Result Round off the reading or calculate the mean outsidediameter to the next higher 0.1 mm.

N OTE The measurement of diameters less than orequivalent to 40 mm may be obtained from the averageof 4 uniformly distributed measurements of diametersusing vernier calipers. For higher diameters up to110 mm pitapes or vernier calipers shall be used, taking the average of two measurements at right angle.

3. OUTSIDE DIAMETER AT ANY POINT

3.1 Required Precision The precisionrequired in each measurement is 0.05 mm.

3.2 Principle Determination of themaximum and minimum outside diameters of cross-section, several outside diameters being measured until maximum and minimum valuesare found.

3.3 Measuring Apparatus Slide caliperspermitting a reading to the nearest 0.05 mm.

3.4 Procedure Place the fixed jaw of theslide calipers on one side of the pipe and themoving jaw on the other side, perpendicular tothe axis of the pipe, and move the calipersalong until both jaws make a clean contact withthe surface of the pipe. Take the reading afterchecking that the instrument is in correctposition in relation to the pipe. Takemeasurement around the same cross-section,turning the calipers in the plane of this sectionuntil the maximum and minimum values areobtained.

3.5 Expression of the Results Round off the reading to the next higher 0.1 mm and notethe readings of the largest and the smallest

values measured for the same cross-section.

*Specification for unplasticized PVC pipes for potablewater supplies ( second revision ).

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IS : 12235 (Part 2) - 1986

5

Indian Standard


PVC PIPES FOR POTABLE WATER SUPPLIESPART 2 MEASUREMENT OF WALL THICKNESS

1. SCOPE

1.1 This standard (Part 2) covers the method of measurement of wall thickness of unplasticisedplastic pipes manufactured in accordance withIS : 4985-1988*.

2. METHOD OF MEASUREMENT

2.1 The wall thickness shall be measured byany of the two methods given in 2.1.1 and 2.1.2 .

2.1.1 Dial Gauge Method2.1.1.1 Required precision The precisionrequired in each measurement of wallthickness is 0.05 mm.2.1.1.2 Measurement apparatus The wallthickness shall be measured with a dial gaugecomplying with the following measurements:

a) It shall permit a reading up to 0.01 mm,b) It shall be equipped with a fixed rod

forming a rigid unit with the apparatus,c) The extremity of the plunger (movable

contact point) shall be hemispherical inshape with a radius of approximately1.0 mm, and

d) The surface of the fixed and movablecontact points shall be made of hard steel.

2.1.1.3 Procedure After introducing the fixedcontact point inside and perpendicular to theaxis of the pipe and applying it without force onto the internal surface of the wall, free theplunger and seek a position for the apparatuswhich provides the lowest reading.

2.1.1.4 Expression of the result Round off thelowest reading so obtained to the nearest0.1 mm.

2.1.2 Micrometer Method

2.1.2.1 The precision in each measurement of wall thickness is 0.05 mm.

2.1.2.2 Measuring apparatus The wallthickness shall be measured with a ball-endedmicrometer permitting a reading to theaccuracy of 0.01 mm.

2.1.2.3 Expression of the result Round off thereading obtained to the nearest 0.1 mm.


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IS : 12235 (Part 3) - 1986

7

b) Photo-electric cell (with filter correction tomatch eye response), and

c) Digital current meter.

4.2 Procedure

4.2.1 The light source and photo-electric cellshall be set up at a distance to get maximumreading in the galvanometer in the absence of sample and also in the absence of day light.Connect the galvanometer to the photoelectriccell and the maximum deflection produced bythe light flux of the source falling on thephoto-electric cell shall be noted.

4.2.2 Place the test piece on the photo-electriccell in such a manner that one wall is touching the photo cell surface between the light sourceand the cell (distance between source and fromcell remaining constant).

4.2.3 Read on the spot light galvanometer themaximum deflection produced by the light fluxof the source. The deflection corresponds to thelight flux passing through the wall of the testpiece.4.2.4 The second deflection expressed as apercentage of the first shall give the measure of

visible light transmitted.

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IS : 12235 (Part 5) - 1986

9

Indian Standard


PVC PIPES FOR POTABLE WATER SUPPLIESPART 5 REVERSION TEST

1. SCOPE

1.1 This standard (Part 5) covers the method of test for reversion test performed onunplasticized PVC pipes manufacturedaccording to IS : 4985-1988*.

2. GENERAL

2.1 This test may be carried out either in an airoven or alternatively in a bath of ethylene

glycol, glycerol or mineral oil free fromaromatic hydrocarbons.2.2 Form of Test Specimen The testspecimen shall consist of a length of pipe200 20 mm long. Two circumferential marksshall be scribed on the test specimen 100 mmapart and in such a way that one of thesemarks is approximately 15 mm from one end of the specimen.

3. IMMERSION METHOD

3.1 Apparatus The apparatus shall consistof a thermostatically controlled bath in whichheat transfer medium is ethylene glycol,glycerol or mineral oil free from aromatichydrocarbons. The bath is stirred continuouslyand maintained automatically at a temperatureof 150 2C.3.2 Procedure The test specimen shall besuspended in the heat transfer medium by theend farther from the scribed marks in such away that both scribed marks are completelyimmersed. Care shall be taken to ensure thatthe specimen does not touch the sides or bottomof the bath. The test specimen shall beimmersed in the bath for a time determined asfollows:

a) For pipe of wall thickness not greater than8.6 mm 15 minutes,

b) For pipe of wall thickness greater than8.6 mm but not greater than 14.1 mm 30 minutes, and

c) For pipe of wall thickness greater than14.1 mm 60 minutes.

After the specified immersion period, thespecimen shall be removed from the bath, laidon its side and allowed to cool to roomtemperature. The distance between the twoscribed marks shall be measured along thesurface of the pipe and the percentage changein length calculated.

4. OVEN METHOD

4.1 Apparatus An electrically heated airoven with circulating fan, the whole interior of which is maintained automatically at atemperature of 150 2C.

4.2 Procedure The specimen shall beplaced in the oven and the time measured fromthe moment at which the oven regains atemperature of 150C. The test specimens shallbe kept in the oven for a time determined asfollows:

a) For pipe of wall thickness not greater than8.6 mm 60 minutes,b) For pipe of wall thickness greater than

8.6 mm but not greater than 14.1 mm 120 minutes, and

c) For pipe of wall thickness greater than14.1 mm 140 minutes.

After the specified period, the specimen shall beremoved from the oven, laid on its side andallowed to cool to room temperature. Thedistance between the two scribed marks shallbe measured along the surface of the pipe andthe percentage change in length calculated.

5. ASSESSMENT OF RESULTS

5.1 The specimen, when tested as above, shallmeet the requirements given in 6.4 of IS : 4985-1988*.



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IS : 12235 (Part 6) - 1986

10

Indian Standard


PVC PIPES FOR POTABLE WATER SUPPLIESPART 6 STRESS RELIEF TEST

1. SCOPE

1.1 This standard (Part 6) covers the method of test for stress relief test performed on theunplasticized PVC pipes manufacturedaccording to IS : 4985-1988*.

2. TEST SPECIMENS

2.1 The specimen shall consist of full bell endportion with 100 mm length of plain pipe.

3. APPARATUS3.1 An electrically heated air oven withcirculating fan, the whole interior of which ismaintained automatically at a temperature of 150 2C.

4. PROCEDURE

4.1 The specimen standing on its bell end shall

be placed in the oven. The specimen may besupported, if necessary, by a simple jig that hasbeen preheated in the oven.

4.2 The specimen shall be kept in the oven for 1hour. The duration shall be measured from thetime at which the oven regains the temperatureof 150C.

4.3 After 1 hour, the specimen shall be removedfrom the oven and allowed to cool naturally inthe air before examination.


5.1 The sample shall meet the requirementsspecified in 6.5 of IS : 4985-1988*.



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IS : 12235 (Part 7) - 1986

11

Indian Standard


PVC PIPES FOR POTABLE WATER SUPPLIESPART 7 RESISTANCE TO SULPHURIC ACID

1. SCOPE

1.1 This standard (Part 7) covers the method of test for resistance to sulphuric acid of unplasticized PVC pipes manufacturedaccording to IS : 4985-1988*.

2. FORM OF TEST SPECIMEN

2.1 The test specimen shall be cut from the pipeand shall have a total surface area of

45 3 cm2.

3. PROCEDURE

3.1 The test specimen shall be cleaned, wiped

dry and weighed, then totally immersed in93 0.5 percent (m/m) sulphuric acid for 14days at 55 2C. Care shall be taken to avoidgradual concentration of the acid during thetest due to evaporation losses, etc. After thespecified time, the specimen shall be removed,washed in running water for 5 minutes wipeddry with a clean cloth and reweighedimmediately.

4. ASSESSMENT OF RESULTS4.1 The average change in mass shall notexceed the value given in 6.6 of IS : 4985-1988*.



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IS : 12235 (Part 8) - 1986

12

Indian Standard


PVC PIPES FOR POTABLE WATER SUPPLIESPART 8 INTERNAL HYDROSTATIC PRESSURE TEST

1. SCOPE

1.1 This standard (Part 8) covers the method of test for internal hydrostatic pressure testcarried out on unplasticized PVC pipesmanufactured according to IS : 4985-1988*.

2. GENERAL

2.1 The test shall be carried out not earlierthan 24 hour after the pipes have been

manufactured.3. TEST SPECIMENS

3.1 A sample of pipe having free lengthbetween the end fittings equal to ten times theoutside diameter but not less than 250 mm orgreater than 750 mm shall be taken for everytesting from each pipe to be tested.

4. APPARATUS

4.1 Equipment which permits the application of controlled internal hydraulic pressure to thespecimen which is immersed in athermostatically controlled water-bath.

5. PROCEDURE

5.1 The pipe shall be fitted with the locking plugs at both ends in such a way that the axialforces coming from the internal pressure aretransmitted to the pipe. The pipe shall remainfree to move in longitudinal direction.5.2 Through a closable opening in one of thelocking plugs, the pipe shall be filled with

water at ambient temperature. It shall be thenput in a water-bath at the test temperature(permissible deviation 1C) and kept in thebath for 1 hour to adjust the temperature.5.3 The pressure in the pipe shall then beincreased to the test pressure ( p ) graduallyand without shock, preferably within 10 to 30seconds in the bath whose temperature hasbeen adjusted in accordance with 5.2 . The

pressure with a permissible deviation of 2.5percent shall be maintained for the test periodlaid down in Table 4 of IS : 4985-1988*. Thetest pressure ( p ) shall be calculated as followsfrom the induced stress values in Table 4 anddimensions given in Table 1 of IS : 4985-1988*:

p =


6.1 The sample shall not rupture during theprescribed test period. The test showing burstswithin a distance d from the end cap, where d isthe mean outside diameter, shall bedisregarded and the test repeated.



where

p = test pressure in MPa, = induced stress in MPa,s = minimum wall thickness in mm,

nominal andd = outside diameter in mm.

2 sd s------------

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IS : 12235 (Part 9) - 1986

13

Indian Standard


PVC PIPES FOR POTABLE WATER SUPPLIESPART 9 IMPACT STRENGTH AT 0C

1. SCOPE

1.1 This standard (Part 9) covers the method of test of impact strength of unplasticized PVCpipes at 0C manufactured according toIS : 4985-1988*.

2. SPECIMEN

2.1 Each specimen 300 mm long shall be acomplete section of pipe. The ends of each

specimen shall be cut clean and square to theaxis of the pipe.

3. CONDITIONING OF TEST SPECIMEN

3.1 Each specimen shall be conditioned for atleast 1 hour prior to test at a temperature of 0 1C. Individual specimens shall be testedwithin 10 seconds of removal from theconditioner. For round the clock ( see 5.1.1.2 )testing, when the test might not be completedwithin 10 seconds, the specimen shall bereconditioned for a further period of at least 10minutes.

4. APPARATUS4.1 An impact testing machine (falling weightmachine), a suitable form of which is shown inFig. 1, shall be used which shall consistessentially of the following:

a) A main frame which may be rigidly fixedin a true vertical position.

b) Guiderails carried from the inside of themain frame on side bearings which may beadjusted to keep them parallel and

vertical.c) A striker which may fall freely within the

guiderails and which is equipped with ahardened hemispherical striking surfaceof 25 1 mm diameter. The striking surface shall be free from flats and/orother imperfections.

d) An appropriate set of mass which may befirmly attached to the striker to enable thecombined mass of striker and massattached to be adjusted to the values givenin Table 1.

e) A specimen support comprising a 120cast steel Vee block at least 250 mm in

length which is positioned below theguidelines so that the tip of the impactstriker is not more than 2.5 mm from theaxis of the Vee block.

f) A release mechanism such that a strikermay fall through the height as required inTable 1 on the top surface of the pipespecimen.

g) Means for maintaining a constant heightof fall by vertical movement of either the Vee block, the release mechanism or themain frame in order to accommodate

various diameters of pipe.


F IG . 1 I MPACT T ESTING M ACHINE

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IS : 12235 (Part 10) - 1986

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Indian Standard


PVC PIPES FOR POTABLE WATER SUPPLIESPART 10 METHOD FOR DETERMINATION OF ORGANOTIN AS TIN

AQUEOUS SOLUTION

1. SCOPE

1.1 This standard (Part 10) covers the methodfor determination of organotin as tin aqueoussolution of unplasticized PVC pipesmanufactured according to IS : 4985-1988*.

2. PRINCIPLE

2.1 Toluene-3, 4-dithiol (dithiol) forms a

coloured complex with an acid solution of divalent tin. This colloidally dispersed redcompound is used for the determination of tinby a spectrophotometric method.2.2 The lower limit of the determination isabout 2 g of tin.

3. APPARATUS

3.1 Spectrophotometer suitable for use inthe visible region of the spectrum with 1 and4 cm cells.

4. REAGENTS

4.1 The reagents used shall be of. recognizedanalytical reagents quality. Water complying with IS : 1070-1977 shall be used throughout.

a) Concentrated Nitric Acid relativedensity 1.42.

b) Perchloric Acid 600 g/litre solution.

c) Thioglycollic Acid approximately 98percent.

d) Dilute Sulphuric Acid 25 percent (v/v)solution.

e) Dodecyl Sodium Sulphate 20 g/litre

solution. Dissolve 2 g of dodecyl sodiumsulphate (sodium lauryl sulphate) in100 ml of warm water. The solution maylose its clarity on cooling; gentle warming will restore it.

f) Toluene-3, 4-dithiol 2 g/litre solution.Dissolve 0.2 g of toluene-3, 4-dithiol(dithiol) or 0.28 g of zinc toluene-3,4-dithiol in 5 ml or 5 N sodium hydroxide.

Add 1 ml of thioglycollic acid and dilute to

100 ml with water. Filter, if necessary.This solution should be prepared freshdaily.

N OTE The life of this solution may be extended toabout one week if it is stored under refrigerationconditions.

g) Standard Tin Solution 0.2 mg Sn/ml.Dissolve 0.200 g of tin in 100 ml of 50percent ( v / v ) hydrochloric acid and dilutewith the same acid to 1 000 ml.

h) Standard Tin Solution 0.02 mg Sn/ml.Prepare by diluting the 0.2 mg Sn/mlstandard solution [reagent (g)] as requiredwith 25 percent ( v / v ) hydrochloric acid.

j) Standard Tin Solution 0.004 mg Sn/ml.Prepare by diluting the 0.02 mg Sn/mlstandard solution [reagent (h)] as requiredwith 25 percent ( v / v ) hydrochloric acid.

5. PROCEDURE

5.1 Preparation of Colour Standards

a) High Range ( 100-500 m Tin per Test ) Into six 25-ml one-mark volumetric flasks( see IS : 915-1975* ) transfer volumes of the 0.004 mg/ml standard tin solution[reagent (j)] from 0 to 5.0 ml increasing bystages of 1.0 ml. Treat each in thefollowing manner:

Dilute with water to about 6 ml, add 2 dropsof thioglycollic acid [reagent (c)] followed by2 ml of the dilute sulphuric acid [reagent (d)]and mix thoroughly. Cautiously add 0.4 ml of the dodecyl sodium sulphate solution[reagent (e)] with constant swirling; avoidshaking which creates foam. Continue toswirl the contents of the flask while adding 0.2 ml of the toluene-3, 4-dithiol solution[reagent (f)]. Dilute to 25 ml, stopper theflask and shake thoroughly. Fifteen minutesafter the addition of toluene-3, 4-dithiolsolution, measure the optical density of eachsolution in a 1-cm cell at a wavelength of 535 m and with water in the matchedcomparison cell. Prepare graph of the opticaldensity readings against micrograms of tinpresent.


Specification for water for general laboratory use( second revision ).

*Specification for one-mark volumetric flask ( firstrevision ).

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IS : 12235 (Part 10) - 1986

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b) Low Range ( Up to 100 m Tin per Test ) Into six 50-ml one-mark volumetricflasks ( see IS : 915-1975* ) transfer

volumes of the 0.02 mg/ml standard tinsolution [reagent (h)] from 0 to 10.0 ml

increasing by stages of 2.0 ml. Treat eachin the following manner:

Dilute with water to about 15 ml, add 2drops of thioglycollic acid [reagent (c)]followed by 10 ml of the dilute sulphuricacid [reagent (d)] and mix thoroughly.Cautiously add 2.0 ml of dodecyl sodiumsulphate solution [reagent (e)] withconstant swirling; avoid shaking, whichcreates foam. Continue to swirl thecontents of the flask while adding 1.0 ml of toluene-3, 4-dithoil solution[reagent (f)]. Dilute to 25 ml, stopperthe flask and shake thoroughly. Fifteenminutes after the addition of toluene-3,4-dithoil solution measure the opticaldensity of each solution in a 4-cm cell ata wavelength of 535 m and with waterin the matched comparison cell. Preparea graph of the optical density readings

against the micrograms of tin present.5.2 Determination Evaporate a suitable

volume of the test solution ( see Part 4 ) todryness, add 2 ml of the diluted sulphuric acid[reagent (d)] and evaporate to fumes of sulphur

trioxide. Add concentrated nitric acid [reagent(a)] dropwise until the oxidation is complete.Cool, add 1 ml of concentrated nitric acid[reagent (a)] followed by 0.2 ml of perchloricacid [reagent (b)] and evaporate to fumes of sulphur trioxide. Cool, transfer the contents of the basin quantitatively to 10 ml one-mark

volumetric flask ( see IS : 915-1975* ) anddilute to about 8 ml with water. Add two dropsof thioglycollic acid [reagent (c)] and, withconstant swirling, 0.4 ml of the dodecyl sodiumsulphate solution [reagent (e)]. Add 0.2 ml of the toluene-3, 4-dithiol solution [reagent (f)];dilute to the mark, stopper the flask and shakethoroughly. Transfer a quantity to a suitablecell and 15 minutes after the addition of toluene-3, 4-dithoil solution, measure its opticaldensity at a wave-length of 535 m, with waterin the matched comparison cell, and read theamount of tin present from the appropriatecalibration graph ( see 5.1 ).

*Specification for one-mark volumetric flasks ( firstrevision ).

*Specification for one-mark volumetric flasks ( firstrevision ).

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IS : 12235 (Part 11) - 1986

17

Indian Standard


PVC PIPES FOR POTABLE WATER SUPPLIESPART 11 EXTRACTABILITY OF CADMIUM AND MERCURY OCCURRING

AS IMPURITIES

1. SCOPE1.1 This standard (Part 11) specifies a methodof test for the determination of theextractability of cadmium and mercuryoccurring as impurities from unplasticized PVCpipe manufactured according toIS : 4985-1988*.

2. FIELD OF APPLICATION

2.1 This standard applies to unplasticizedpolyvinyl chloride (PVC) pipes intended for thetransport of drinking water. It only relates tothe extractability of:

a) cadmium and its derivatives, andb) mercury and its derivatives.

3. PRINCIPLE3.1 Pre-washing of test pieces during a fixedtime. Filling the test pieces with water acidifiedwith carbon dioxide. Determination of thequantity of extracted impurity.

N OTE The analytical test methods to be used for thedetermination of the quantity of material taken into

solution are not defined. They shall, however, allow theanalysis to be carried out with an accuracy of 0.005 mg/lfor cadmium and of 0.000 6 mg/l for mercury.

4. APPARATUS4.1 Glass Tube with Glass Cock4.2 Stoppers in polyethylene or any othermaterial which has been shown not to effect theresults.4.3 Distilled water, acidified to a p H of 4.5 0.1by bubbling a current carbon dioxide throughit.

5. PREPARATION OF TEST PIECES

5.1 For each test, select three pieces of the pipeat random, each of which is 300 mm in lengthand has an internal volume at least equal to the

volume of the extracting liquid required todetermine with the required precision theamount of material which has migrated.

6. PROCEDURE6.1 Pre-washing 6.1.1 Close one end of each test piece with astopper ( see 4.2 ) fitted centrally with thelengths of glass tube ( see 4.1 ) fitted with astopcock.

6.1.2 Clamp the test pieces vertically with openend upwards.6.1.3 Pass tap water of p H 7 to 8 through thetest pieces so that its linear rate of flow is3 m/min, calculate from the average internalcross-sectional area of the pipe and the testpieces are continuously filled with water.6.1.4 Maintain the water flow for a period of 60 min.

6.1.5 At the end of this period, stop the waterflow, remove the stoppers and rinse out the testpieces with distilled water.6.2 Extractability Test

6.2.1 Close, with a stopper ( see 4.2 ) one end of each pre-washed test piece.6.2.2 Fill each test piece with acidified water( see 4.2 ), the temperature of which has beenadjusted to approximately 20C.

N OTE For each series of tests, a freshly preparedsolution of acidified water ( see 4.3 ) shall be used.

6.2.3 Close the other end of each test piece bymeans of a stopper ( see 4.2 ) and maintain thefilled test pieces at 20 2C for 48 hours.6.2.4 First Extraction At the end of 48 hours,empty the water from the test pieces intosuitable stoppered containers and determinethe quantity of cadmium or mercury.6.2.5 Second Extract Fill the same testpieces with the test water ( see 4.3 ) and, having closed them again, maintain them at 20 2Cfor 48 h. At the end of this period, transfer thetest water from the test pieces to suitablestoppered containers and determine thequantity of cadmium and mercury in each.6.2.6 Third Extract Fill the test pieces for athird time with the test water ( see 4.3 ) andhaving closed them again, maintain them at20 2C for 48 h. At the end of this period,transfer the test water from the test pieces tosuitable stoppered containers and determinethe quantity of cadmium and mercury in each.

7. EXPRESSION OF RESULTS7.1 Cadmium7.1.1 Calculate for the three test pieces thearithmetic mean of the quantities of cadmiumdetermined in the extracts for first, second andthird extractions.


+100

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IS : 12235 (Part 11) - 1986

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7.1.2 Express the results in milligrams per litrewith an accuracy of 0.005 mg/l.

7.2 Mercury

7.2.1 Calculate for the three test pieces thearithmetic mean of the quantities of mercurydetermined in the extracts for first, second andthird extractions.

7.2.2 Express the results in milligrams per litrewith an accuracy of 0.000 5 mg/l.

8. TEST REPORT

8.1 The test report shall include the following information:

a) Complete identification of the pipe tested;b) Number of test pieces;

c) Analytical method used for thedetermination of the quantity of cadmiumin aqueous solution;

d) Analytical method used for thedetermination of the quantity of mercuryin aqueous solution;

e) Duration of pre-washing;f) Quantities of extracted cadmium found for

each test piece for first, second and thirdextraction;

g) Arithmetic mean of the quantities of extracted cadmium for the pipe for first,second and third extraction;

h) Quantities of extracted mercury found foreach test piece for first, second and thirdextraction;

j) Arithmetic mean of the quantities of extracted mercury for the pipe for first,second and third extraction; and

k) Details of the procedure which have not

been provided for by this test method andalso any accidental circumstance whichmight have attached the results.

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Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act , 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goods andattending to connected matters in the country.

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BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed periodically; a standard along with amendments is reaffirmed when such review indicates that nochanges are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition byreferring to the latest issue of BIS Catalogue and Standards : Monthly Additions.

This Indian Standard has been developed by Technical Committee : CED 50

Amendments Issued Since Publication

Amend No. Date of Issue

Amd. No. 1 August 1999

BUREAU OF INDIAN STANDARDS

Headquarters:

Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002.Telephones: 323 01 31, 323 33 75, 323 94 02

Telegrams: Manaksanstha(Common to all offices)

Regional Offices: Telephone

Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI 110002

323 76 17323 38 41

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Branches : A H M E D A B A D . B A N G A L O R E . B H O PA L . B H U B A N E S H WA R . C O I M B AT O R E .FA R I D A B A D . G H A Z I A B A D . G U WA H AT I . H Y D E R A B A D . J A I P U R . K A N P U R .LUCKNOW. NAGPUR. NALAGARH. PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM.

VISHAKHAPATNAM.

Documents

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