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 12701 (1996): rotational moulded polyethylene waterstorage tanks [CED 3: Sanitary Appliances and WaterFittings]

IS 12701 : 1996

)

Indian Standard

Reaffirmed 2006

ROTATIONAL MOULDED POLYETHYLENE WATER STORAGE TANKS — SPECIFICATION

( First Revision )

First Reprint JUNE 1998

ICS 23.020.10

© BIS 1996

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

August 1996 Price Group 5

A~1Ef'.!Dl\1EI~T NO. 1 JAr~~UARv:: 2C3iTO

r::: ll.~: 'j J : : ~\.,,.. ~ ~(, ! ~ , r 't.' I 1'1/\ !.1 l\~ {} Ui .nI~ I}l'OL\'E'rIIYLE~\1E WA'!·El{ S'l'OItAGE 'I'ANKS­

SPECI[iICA~l"jON

(Page 4, clause 5.5 ) - Insert the followii, ~ new clause after 5.5:

eS.6 Rotational moulded polyethylene \'t'" .cr ~ irsge tanks luay be manufacturedill single layeror double layers, inner Iaycr . -, 1" white i.. colour. The outerlayer shall beblack in colour and its thickness ~ · be minimum 50 percent of.the total thickness of the waU.'

(CE03 )Reprography Unit. BIS, NewDelhi,lndia

AMENDMENT NO. 2 JUNE 2004TO

IS 12701: 1996 ROTATIONAL MOUIJDEDPOLYETHYLENE WATER STORAGE l'ANKS­

SPECIFICATION( First Revision)

( Page 4, clause 7.6. line 4) - Substitute 'tested according to 6 of IS 9845­for 'tested according to 5 of IS 9845 : 1986J •

(CED3 )

Reprography Unit. BIS. New Delhi. India

Sanitary Appliancos and Water Flttinp SectiODII CommIttee. CEO 3

FOREWORD

This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards after the draft finalizedby the SanitaryAppJiances andWaterFittingsSectionalCommitteehld beenapprovedby the Civil EngineeringDivision Council.

Looking to the widespread use of rotational moulded polyethylene tanks for the storage of potable waterin India, the committee felt the need to bring out an Indian Standard in order to safeguard the user ofsuch tanks against quality and perfonnance requirements.

This Standard was fint published in 1989. In this revision of thc staudard following major modificationshave been made:

- Wall thicknessand weightof the tanks havebeenmodifiedbasedon the feedbackfrom the manufacturersand users.

- Methods of installation and fittings have been made recommendatory and are separately given atAnnex E.

- Method for carryin. out flexural strength test has been modified.

The composition of the technical committee responsible for the preparation of this standard is given inAnnex F.

For the purpose of deciding whether a particular requirement of this standard is complied with, the finalvalue, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordancewith IS 2 : 1960 'Rules for rounding off numerical values ( revised )', The number of significant placesretained in the rounded off value should be the the same u that of the specified value in this standard.

IS 12701 1996

Indian Standard

ROTATIONAL MOULDED POLYETHYLENEWATER STORAGE TANKS - SPECIFICATION

( First Revision)

1 SCOPE

1.1 This standard covers the requirements ofmaterials, dimensions construction, shape,workmanship, performance requirements andinspection and testing of rotational mouldedpolyethylene water storage tanks with a nominalservice temperature from +1"C to +SooC

1.1.1 These tanks are not meant for undergroumdappl ications.

1.2 This standard is applicable only to water storagetanks subjected to the following two conditions:

a) Own hydrostatic head of water, and

b) Tank with uniform flat base support.

1.3 This standard does not cover mobile water tanksand horizontal cylinderical water tanks.

2 REFERENCES

2.1 The Indian Standards listed in Annex A arenecessary adjuncts to this standard.

3 TERMINOLOGY

3.0 For the purpose of this standard the followingdefinitions shall apply.

3.1 Rotational Moulded Water Storage Tank

A tank moulded from polyethylene powder by theprocess of rotational moulding.

3.2 Net Capacity

~et capacity shall be net volume of water containedbetween the lowest level of the inlet and lowestspecified level.

3.3 Gross Capacity

The total enclosed volume of the tank including anyspace which may not be capable of being tilled withwater.

3.4 Mould Parting Line

A circumferential line visible only on external surfaceof the tank corresponding to a parting joint of themould required for rotational moulding (see Fig. 1).

3.5 Overall Height

The height of the finished empty tank at its highestpoint including the top rim of the man-hole and lidof the tank (see Fig. I).

3.6 Effective Height

The height of the finished empty tank from its baseto the point where overtlow connection is providedfor the purpose of limiting water storage capacity(see Fig. 1).

3.7 Overall Diameter

The maximum diameter of finished empty tankmeasured at its base as the mean of two measurementsof diameters including wall thickness of the tank andavoiding the mould parting line (see Fig. 1).

3.8 Rim Height

The perpendicular distance from the highest pointof the top rim of the man-hole to the nearest pointof the shoulder of the finished empty tank (see Fig. 1).Rim can be provided above the tank or within thetank.

3.9 Man-HoleJHand-Hole

A hole of suitable internal diameter provided at thetop of the tank, for the purpose of inspection ofinternal surface and entry into the tank.

3.10 Internal Diameter of Man-HoleJHand-Hole

The internal diameter of the rim of the .man-holemeasured as the mean of two perpendicular diameters(see Fig. 1).

4 MATERIALS

4.1 The material of construction of tank, lid andfittings which come in contact with water shall besuch that it does not impart any taste, colour or odourto water, nor have any toxic effect, and it shall notcontaminate water thereby making it unpotable.

4.2 Polyethylene resin to be used for the manufactureof water tanks should be of rotational moulded gradeand duly stabilized with 'anti-oxidants. The anti­oxidants used, not exceeding 0.3% by mass of finishedresin, should be physiologically harmless and shouldbe selected from the list given in IS 10141 : 1982.In addition, the material shall also meet therequirements given in 4.2.1 to 4.2.4.

4.2.1 The density of resin (base material) at 23''Cwhen tested in accordance with IS 7328 : 1992 shallbe within 932 to 943 kg/rn',

IS 12701 : 1996

4.2.2 The melt flow rate (MFR.) of the resin whentested under the test condition D (temperature 1900Cand nominal load of 2.16 kg) and in accordancewithIS 2530 : 1963shall bewithin2.0 to 6.0 gllO minutes.

4.2.3 The water tanks meant for out door' use shallbe manufactured from carbon black compoundedpolyethylene. The carbon black content and carbondispersion test shall becarried out in accordance withthe procedure described in IS 2530 : 1963 and shallmeet the following requirements:

a) The percentage of carbon black content inthe material shall be within 2.0 and 3.0, and

LID OF

b) The dispersion of carbon black shall besatisfactory.

• \ ~ I

4.3 Thc'8ddition of not more than 10 percent of themanuf,act.U1\ers own reworked material resulting fromthe manufacture of tanks only according to thisstandard i~ permissible. No other reworked or recycledwaste material from any other source or filler shallbe used in the manufacture of tanks.

5 TYPES:AND FEATURES

5.1 Cylinderlcal Vertical Tank (Fig. 1)

The dimensions, net and gross capacities and weightof the tank shall be as given in Table 1.

FLOAT TYPE LEVEL'NDIe ATOR (OPTIONAL)

MOULD PARTINGLINE

~C) ...

:z:w !:!% WW Z~ ~... -JU Cw ~IL. 1&1I&. >W 0

R CC/PCCPLATFORM

NOTE - A 25 mm wide band shall be painted around the tank at the inlet/overflow level and outletlevel. Centre line of the band shall be SO mm minimum fiom top/inner bottom of the tank.

A --- Malethreaded 0.1. brassor PVC connections.

FlO. 1 TvPIc4 DETAILS OF CYLINDERICAL VERnCAL TANK

2

IS 12701 : 1996

Table 1 Dimensioas of Cylinderical Vertical Tank(Clause 5.1)

81 MInimum Net Capacity Ovenll Ovenll MlDbDam Ialemal M1D_um Wall MiDlmumNo. Up to lUfectl•• Dlmeter Hel&ht RaDle Dia of Maa-BoW aad Bottom Welgbt 01 toll

Bellht Ranle Band-Bole TbIckDeu (WIthout Lid)(I) (nun) (mm) (nun) (mm) (kg)

(I) (2) (3) (4) (S) (6) (7)

i) 200 6~0 - 850 490 .. 690 265 3.0 7..8ii) 300 6S0 .. 8S0 700 900 265 3.0 9.0iii) 400 700 .. 980 700 .. 9S0 265 3.S 15.0iv) 500 800 .. 1 140 625 • 1 02.~ 370 4.0 18.0v) 700 900 .. I 140 800 .. 1 100 370 4.4 23.0

vi) 1000 1000·1200 10S0 .. 1 350 370 4..5 33.0vii) 1500 1 080 - 1 450 1 iso - I S90 370 4.S 47.0

viii) 1 700 1 300 .. I SOO 1260 • 1 650 370 4.5 54.0ix) 2000 136S .. 1SOO 1400 .. 1700 4S0 S.4 64.0x) 2SOO 1 380 - I 610 1 400 .. 1 810 450 7.7 81.0

xi) 3000 1410 .. 1 800 1640 - 2 ISO 4S0 8.1 96.0xii) 4000 14S0 .. 1920 17S0 .. 2400 4S0 10.4 147.0

xiii) 5000 1 800 .. 2 110 1 800 .. 2 100 450 10.7 180.0xiv) 6000 1 800 - 2200 206S .. 2800 450 10.7 205.0xv) 7 SOO 1890 • 2250 2100 - 2930 4'0 10.7 239.0

xvi) 10000 1 900 .. 2680 2400 .. 3740 450 11.5 319.0xvii) IS 000 2100 - 2680 3100 .. 4000 450 11.S 408.0

xviii) 20000 2 100 .. 3 ISO 3190· SOOO 450 13.2 566.0

NOTE - The gross capacity ot the tanks shall be at leasr S percent in excess of the minimum net capacity.

5.2 Rectangular Loft Tank (FII. .2,The dimensions, net and gross capacities and weightof the tank shall be as given in Table 2.

· FlO. 2 RECTANOULAR Lorr TANK

5.3 A flat area may be provided on the top of thecylinderical vertical tanks for workers to stand beforeentering the tank.

S.d Wall Thickness

Owing to limitations of rotational moulding process,the wall thickness of the water storage tank at bottom,top and cylinderical sides at the bottom and topedges where the shape of tank changes is usuallyfound to be much greater than the wall thickness atother surfaces.Forcylinderical vertical tanks the wallthickness upto the effective height of the tank shallnot be less than the values given in Table 1 and thewall thickness above the effective height of the tankshall be not less than 15 per cent of the values given

Table 2 Dimensions of Rectangular Loft Tanks

(Clause 5.2)

SI Minimum Net Overall Ovenll ()yenll MlDmum Mlalmom Wall MinlDumNo. Capacity Length Width He1Rbt InterDal Dia of Thickness Welpt

Hand Hole (MeuurecI on) Weight ofRectanplar Tank

Vertical Port (Without Lid)aDd BottomThickness

(I) (2) (3) (4) (S) (6) (7) (8)

i) 1$0 620 .. 820 620 • 820 28S • 48S 300 2.7S 6.6

ii) 200 930 • 1 130 620 .. 820 285 • 485 300 2.7~ 7.7

iii) 300 . 99S· 1200 620 • 820 285 • 48S 300 2.7S 11.0

iv) 400 1 ISO • 1 350 ass • 11S0 335 .. 535 300 2.7S 13.0

v) 500 1 ISO • 1500 900 .. 1250 33~ .. 53S 300 2.7S 17.S

NOTE - The Iro~R capacity of the tanks shall be at lea.c;t S percent in excess of the minimun net capacity.

3

IS 12701 : 1996

in Table 1. For rectangular loft tanks the wall thick­ness shall be in accordance with the values givenin Table 2. The wall thickness shaU be measured atleast at 20 points well distributed on the sides, topand bottom. Thickness measurement on lid shall bemade at least in four well distributed locations.

s.s The dimensions as given in 5.1 and 5.2 referto finished empty tanks. Measurement shall be madeafter 48 hours of moulding. The wall thickness maybe measured with a dial gauge micrometer fitted withspherical anvils. The overall diameter, height andother dimensions may be measured with steel ruleor steel tape of desired accuracy by placing the emptytank on a flat surface.

6 FINISH

6.1 The internal and external surface of the waterstorage tank shall be smooth, clean and free fromother hidden internal defects, such as air bubbles.pits and metallic or other foreign material inclusions.The mould parting line and excess material near thetop rim of the tank shall be cut and finished to therequired level. Defects like air bubbles and pits atmould parting line and at top rim of themain-man-hole shall be repaired by hot-air fiIler rodwelding method.

7 PERFORMANCE REQUIREMENTS

7.1 Resistance to Deformation

7.1.1 When cylindrical vertical water storage tanksis tested in accordance with the Method 1 describedat Annex B, the difference between thecircumferrential measurement shall not be greaterthan 2 percent of the original measurements.

7.1.2 When rectangular loft tank is tested inaccordance with the Method 2 described atAnnex B the difference between the longitudinalmeasurements shan not be greater than 3 percent ofthe original measurements.

NOTE - The tank shall not crack at the observed deflection.

7.2 Resistance to Impact

When polyethylene water tank is tested in accordancewith the method as described in Annex C the impactshall neither result into cracking nor puncture of thetank.

7.3 Test for Top Load Resistance

7.3.1 The tank shall be filled to 98 percent of itsnet capacity and shall be subjected for not less than4 hours at outdoor temperature to compression bymeans of 100 kg load applied on the horizontal surfaceprovided for a man to stand before entering the tank.After removal of the load the test specimen shall beinspected for deformation or crack on the surface andafter 4 hours of the removal of the load the flatsurface shall return to normal position.

4

This test shall be applied to tanks with capacity 1 SOOlitres and more.

7.4 TensUe Strength

7.4.1 Tensile strength at yield shall be determinedin accordance with IS 8543(Part 4/Sec 1) : 1984.The tensile strength of the wall of water tanks shallnot be less than 12 N/mm2

•

7.4.2 The test specimens shall be cut from the flatportion of the top of the water tank at a temperaturenot exceeding 500e and then machined.

7.5 Flexural Modulus

7.5.1 The flexural modulus shall be determined inaccordance with IS 13360 (Part SISec 7): 1995.The flexural modulus of the wall of the water tankshall not be less than 300 N/mm2

• The sample shallbe taken as given in 7.4.2.

7.6 Overall Migration

The material ofconstruction (compounded resin) shallmeet the specified limits of overall migration ofconstitutents as specified in IS 10146 : 1982 whentested according to 5 of IS 9845 : 1986.

8 SAMPLING AND TESTING

8.1 Routine Tests

The scale of sampling and criteria for conformity ofa lot for routine tests specified in Table 3 shall beas given in Annex D.

Table 3 Routine Tests

81No. Test Ref to Clauseand Annex

(1) (2) (3)

i) Band width/location Fig. 1ii) Outer dimensions and Weight Table 1 and Table 2

iii) Net capacity Table 1 and Table 2iv) Gross capacity Table I and Table 2v) Thickn~~5es Table 1 and Table 2

vi) Resistance to defonnation 7.1 and Annex Bvii) Resistance to impact 7.2 and Annex C

viii) Test for top load resistance 7.3ix) Tensile strength 7.4

x) Flexural modulus 7.S

8.2 Type Tests

Type tests are intended to prove the suitability andperformance of water tank of a new composition, anew technique, new shape or modified wall thickness.Such tests need necessarily be done, before undertakingmass production when a change is made in polymercomposition or method of manufacture or when a

new size and shape of water tank is introduced.However, if no change is envisaged, at least onesample of any size shall be put to 'Type Tests' oncein a year. Tests for suitability of tank material asspecified in 4 and overall migration as specified in7.6 shall be taken as type tests.

9 MAN-HOLE HAND-HOLE LIDS

9.1 Materials

Man-hole hand-hole lids shall be moulded frompolyolefins of minimum thickness 3mm and shallhave sufficient ribs to provide adequate stiffness. Itshall be stabilized with 2 to 3 percent of carbon blackhaving satisfactory dispersions. The carbon blackcontent and carbon disperion test shall be carried outin accordance with IS 2530:1963

9.2 The lid shall fit securely over the top rim of thetank and it shall rest evenly on it in order to preventthe ingress of foreign matter such as insects,mosquitoes or dust through the top of the tank. Thelid shall also be provided with suitable lockingarrangement.

9.2.1 To test the lid being fit securily to the manhole,no clearance in it should permit a 1.6 mm diameterwire to pass through.

IS 12701 1996

10 MARKING

10.1 All the water storage tanks shall be markedwith the following information:

a) Manufacturer's name, initials or recognisedtrade mark;

b) Net capacity in litres;

c) Lot or Batch number, and year ofmanufacture; and

d) 'For indoor use only', for tanks meant forindoor use.

10.2 In additions to the marking by painting, themanufacturers name or trade mark and net capacityof the tank shall be moulded on the external surfaceof the tank during manufacture.

10.3 DIS Certifications Marking

The tanks may also be marked with Standard Mark.

10.3.1 1be use of the Standard Mark is governedby the provisions of the Bureau of Indian StandardsAct, 1986 and the Rules and Regulations made thereunder. Details of conditions under which a licencefor the use of the standard mark may be granted tothe manufactures or producers may be obtained fromthe Bureau of Indian Standards.

ANNEX A

(Clause 2.1)

IS No.

554 : 1985

1879 : 1987

2530 : 1963

4905 1968

7328 1992

Title

Dimensions for pipe threadswhere pressure-tight joints arerequired on threads ( thirdrevision)

Malleable cast iron pipe fittings( second revision )

Methods of test for polyethylenemoulding materials andpoly-ethylene compounds

Methods for random sampling

High density polyethylenematerials for moulding andextrusion

IS No.

9845 : 1986

10141 1982

10146 : 1982

Title

Methods of analysis for thedetermination of specific and!or overall migration ofconstituents of plastic materialsand articles intended to comeinto contact with foodstuffs( first revision )

Positive list of constituents ofpolyethylene in contact withfoodstuffs, pharmaceuticals anddrinking water

Polyethylene for its safe use incontact with foodstuffs, pharma­ceuticals and drinking water

8543(Part 4/Sec 1)1984

Methods of testing plastics :Part 4 Short term mechanicalproperties, Section 1 Deter­tnination of tensile properties

5

13360 Plastics - Methods of testing:(Part 5/Sec 7) : Part 5 Mechanical properties,1995 Section 7 Detemination of

flexural properties

IS 12701 : 1'"

ANNEX B

( Clauses 7.1.1 and 7.1.2 )

METHOD OF DEFORMATION TEST

B-1 METHOD 1, FOR CYLINDERICALVERTICAL TANKS

B-l.1 The water tank shall be placed on a natlevel base. A circumferential measurement shall bemade parallel to the base at a distance of one thirdthe effective height. The tank shall be filled uptothe effective height at a minimum rate of 23 l/minwith water at temperature of not less than lSOC.

B-l.2 A continuous film of polythyelene shall befloated over the whole of the surface of the waterin the tank to prevent evaporation.

8-1.3 The tank and water shall be maintained attemperature not less than ISOC and aifter 3 days acircumferential measurement shall be made at thepreviously determined level.

The difference between the two circumferentialmeasurement shall be expressed as a percentage ofthe original circumferential measurements.

B-2 MEmOD 2, FOR RECTANGULAR LOnTANK

8-2.1 The rectangular tanks shall be placed on aflat level base. The internal length and width of thetank shall be measured on the centre lines, as shownin Fig. 3 at the centre of effective height.

FI

8-2.2 The tank shall be filled upto the effectiveheight at a minimum rate of 23 litres/min with waterat a temperature not less than lSOC. The lid shallbe closed after filling the loft tank.

B-2.3 The tank and water shall be maintained ata temperature of not less than 1SOC and after 7 daysmeasurements of length and width shall be made ata previously determined centre lines.

8-2,.4 The deformation in each direction shall becalculated as follows:

DL = W2 - WIX 100

2£.

Dw =La - L,

x 1002W.

Where

DL = deformation of the longer side,

Dw = deformation of the shorter side,

WI = width at the start of test,

Wa = width at the end of the test,

L. = length at the start of test, and

La = length at the end' of test.

r,..- --+ .....--..

I W'C-~~-------'.. I -----t--C CENTRE l~NE

..--- L I MEASUREMENTS;\.........-----04-----..."I

C

FIG. 3

ANNEX C

( Clause 7.2 )

C-I MEmOD FOR IMPACT RESISTANCETEST FOR WATER TANK

C-I.1 The water tank shall be inverted and the baseof tank shall be struck with a 2S mm diameterhemispherically ended striker of mass 2.S kg fallingfreely from a height of 3.0 metre.

6

C-l.2 The striker shall be so arranged as to hit thebase at its mid-point, Three other impacts shall bemade, which shall be as close to the edge or comersof the base u is practical. The shape of the strikershall be such that only the surface of the specifiedhemisphere comes into contact with the tank underthe initial blow,

IS 12701 : 1996

ANNEX D

( Clause 8.1 )

SCALE OF SAMPLING AND CRITERIA FOR CONFORMITY FOR ROUTINE TESTS

Table 4 Scale of Sampling and Criteria forConformity

(For Tanks with Capadty up to I 000 I)

(Clause D-l.3)

D-2.2 The lot having been found satisfactoryaccording to D-2.1 shall be further tested for testsat 81 No. S, 6, 7, 8, 9 and 10 of Table 3. For thispurpose a sub-sample of the size given in col 4 ofTable 4 or col 3 of Table S, as the case may be,shall be selected from those already examined andfound satisfactory according to D-2.1 and shall betested for requirements, as specified. The lot shallbe declared to have satisfied the requirements if nodefective is found in the sub-sample.

n-i SCALE OF SAMPLING

D-l.l Lot

In any consignment, all the tanks of same size andtype made from same raw materials and manufacturedunder similar conditions shall be grouped togetherto constitute a lot.

D-l.2 For ascertaining the conformity of the tanksto the requirements of the specification, samples shallbe tested from each lot separately.

D-I.3 The number of water storage tanks to beselected from a lot shall depend on the size of thelot and_~hall be according to Table 4 for tanks withcapacity up to 1 ()()() litres and Table 5 for tankswith capacity above 1 ()()() Iitres.

D-I.4 The tanks shall be selected at random fromthe lot. In order to ensure the randomness of selectionprocedures given in IS 4905: 1968 may be followed.

SI Lot SizeNo.

Sample Acceptance Sub-sample SizeSize Number for Tests at

SI No. (Y), (vi), (vii),(viii), (Ix) aDd (x)

of Table 3

Table 5 Scale 01 Sampling(For Tanks with Capacity Above 1 000 I)

t Clause D-l.3)

SI Lot Size Sample Size Sub-sample SizeNo. for Tests at

SI No. (v), (vi), (vU),(viii), (Ix) and (x)

of Table 3

(1) (2) (3) (4) (S)

i) Up to SO 2 0 Jii) SI to 100 3 0 I

iii) 101 to 300 S 0 2

iv) 301 to 500 8 0 3v) 501 and above 13 1 S

D-2 NUMBER OF TESTS AND CRITERIA FORCONFORMITY

D-2.1 Visual, Dimensional Requirements andCapacity

D-2.1.1 Tanks of Capacity up to 1 ()()() litres

Each of the tanks selected according to col 1and 2 of the Table 4 shall be examined for the testsat SI No.1, 2, 3 and 4 of Table 3. A tank failingto satisfy one or more of these requirements shallbe considered as defective. The lot shall be deemedto have satisfied these requirements if the numberof defectives found in the sample is less than orequal to the corresponding acceptance number givenin col 3 of Table 4.

D-2.1.2 Tanks of capacity above 1 ()()() litres

Each of the tanks selected according to calland2 of Table 5 shall be examined for the tests givenat 81 No.1, 2, 3 and 4 of the Table 3. A tank failingto satisfy one or more of these requirements shallbe considered as defective. The lot shall be deemedto have satisfied these requirements if there is nodefective in the sample.

7

(I) (2) (3)

i) Up to 2S 2

ii) 26 to SO 3iii) 51 to 100 4iv) 101 and above S

(4)

I

I

I

2

IS 12701 1996

ANNEX E( Foreword)

RECOMMENDATIONS FOR INSTALLATION AND FITTING OF TANKS

E-I Vent pipe/overflow pipe is provided near the topwith mosquito and insect proof cap.

E-l The flat base of cylindrical vertical or rectangularwater storage tanks should be fully supported overits whole bottom area by a durable, rigid, flat andlevel platform sufficiently strong to withstand withoutdeflection the weight of the tank when filled fullywith the water. In case, the tank is placed on asuitable M. S. platform then it is essential that thelatter is free from sharp edges, corners or surfaceprojections and shall be corrosion resistant.

E-3 Where required the tanks shall be suitablyanchored. The tanks may also be provided withclamping devices.

E-4 The pipelines, valves and other fittings shouldbe supported in such a manner that it is alignedproperly so as not to produce any distortion in thewater tank where the fitting is fixed.

E..S The checknuts of the threaded connection shouldbe placed after placing rubber gaskets and shouldnot be overtightened. Under no circumstances shouldjointing compounds or putty be employed in contactwith the polyethylene water tanks. PTFE (poly-tetra­tluroethylene) unsintered tape may be wrapped aroundthe threaded portion of the valves and connectionsto act as a sealant.

E-6 Circular holes drilled for fixing threadedconnections should have a clean edge free fromnotches. Holes can be drilled with a high speed steelhole saw cutter. Scratching or scoring the wall shouldnot be done for setting out holes.

E-7 Where the section of water tank has a changein profile which is accomplished with a radius, itis essential that the outer extremities of the threadedconnections are clear of this radius.

E-8 The water storage tank should not be installedin close proximity to heaters or other direct sourcesof heat.

E-' FITTINGS

E-9.1 For providing inlet, outlet and otherconnections. usually full threaded G.I. brassconnections are used which shall not produce anykind of harmful effect on potable water. A typicalthreaded connections is illustrated in Fig 4. Flat surfacemay preferably be provided to fix outlet pipes atappropriate locations. The design of threadedconnections fixed with the water storage tank maybe similar to that shown in Fig 4. The different sizesof threaded connections required to be fixed fordifferent capacities of water storage tanks may beaccording to Table 6.

E-9.1.1 The overflow pipes should be provided withnon-corrodible mosquito-proof device of maximumclearance not more than 1.6 mm.

Table 6 Sizes of Threaded Connections(Clause E-9.1)

81 Capacity 01 Water Nominal Bore SizeNo. Storage Tank of Threaded Connection

(mrn)

i) Up to 750 12.5ii) Above 750 and up to 2 000 25iii) Above 2 000 and up to 4 000 40iv) Above 4000 and up to 10000 SOv) Above 10000 75

E-9.2 The dimensions of male and female threadsof G.I. PVClbrass full threaded connections and otherfittings like elbow, tee, bend, coupling, nipple, etc,shall be conforming to IS 554 : 1985. The sizes andother dimensions of the fittings, such as centre­to-face, face-to-face andcentre-to-centre shall conformto IS 1879 : 1987. Manufacturers shall provideinstructions for fittings.

THREADED PIPE

FIG. 4 THREADED CONNECTION

8

IS 12701

ANNEX F(Foreword)

COMMITTEE COMPOSITION

Sanitary Appliances and Water Fittings Sectional Committee, CED 3

1996

Chairmdti

SHRI S. PRAKASH

Member.f

SHRI P. K. JAIN (Alternate' toShri S. Prakash)

ADVISOR (PHE)DEPUTY ADVISOR (PHE) (Alternate)

SHRf J. R. AGGARWAL

SURI SANJAY AGGARWAL (Altern(lttJ)

CHIEF ENGINEER (RURAL)

SHRI VIDIIUR 8 tlASKAR

SHRI ARUN KANTI BISWAS

DR T. K. DAN

HYDRAULIC ENGINEER

DEPUTY HYDRAUl.IC ENGINEER (Alternllte)

SURf D. K. KANUNGO

SHRI R. KAPOOR (Alternate)

MANAGING DIRECTOR

CHIEF ENGINEER (PS & G) (Alternate)

SHRI K. LAKSHMI NARAYANA

SIIRf A. SHARIFF (Alternate)

SURI S. K. NEOGI

SHRI A. K. SENGUPTA (Atternate)

StlRI G. RABINDRANATH RAO

SHRI S. SIVAKUMAR (Alternate)

SHRI O. P. RATRA

SHRI R. S. ROTITnORSHRI S. D. JOSHI (Alterntlte)

LT COL S. K. SHARMA

LT COL G. T. KAUSHIK (Alternate)

SHRI D. K. SEHOAl

SHRI 8. B. SIKKA (Alt~rnClte)

SENIOR CIVIL ENGINEER (WATER SUPPLY)

SHRI R. C. SHARMA

SHRI SUDESU KUMAR SHARMA

SHRI SURESH KUMAR SHARMA (Alternate)

SUPERINTI:.NDINO ENGINEER (T AC)EXECUTIVE ENGINEER (TAC) (Altenulte)

Representating

Delhi Water Supply and Sewage Disposal Undertaking (MCD), Delhi

Central Public Health and Environment Engineering. New Delhi

Goverdhan Das P. A. (Calcutta)

Maharashtra Water Supply and Sewage Board. New Mumbai

8 haskar Stoneware Pipes Pvt Ltd, Faridabad

National Environmental Engineering Research Institute «(,SIR). Nagpur

Central Glass and Ceramic Research Institute (CSIR). Calcutta

Municipal Corporation of Greater Mumbai, Mumbai

National Test House, Calcutta

Kcrala Water Authority, (PHED). Tri vandrum

Hindustan Shipyard Lid. Visakhapalnaln

Institution of Public Health Engineers India, Calcutta

E.I.D. Parry (India) Ltd, Madras

Building Material and Technology Promotion Council, New Delhi

Kirloskar Brothers Ltd. Pune

Engineer-in-Chief's Bm~h, Ministry of Defence. Anny Headquarters, New Delhi

Leader Engineering Works, Jallandhar

Ministry of Railways (Railways Board), New Delhi

Directorate General of Supplies and Disposals, New Delhi

Central Building Research Institute. Roorkee

U. P. Jnl Niganlt Lucknow

(Continued 011 page 10)

9

IS 12701 : 1996

(Continued from page 9)

Member.f

SHRI R. K. SOMANY

SHRJ SANDI' SnMANY (Altel7UJte)

SUPRINTENDING SURVEYOR UP WORKS (NDZI)SURVEYOR OF WORKS (NDZI) (Alternate)

SHRt S. SUNDARAM

SHRI VINUO KUMAR,

DIRECTOR (Civil Engg)

Repre.fenting

Hindustan Sanitaryware Industries Ltd, Bahadurgarh

Central Public Work~ Department, New Delhi

Glass fibre Technology Centre, Ceat Ltd, Hyderabad

Director General, BIS (Ex-Officio Member)

Member SecretarySHRJ R. S. JUNEJA

Joint Director (Civil Engineering), 81S

Plastic Water Storage Tanks Subcommittee, CEO 3 : 12

Convener

SHRI O. P. RATRA

Member."

SHRI MUKESH B. AMBANI

SHRI SANJAY SHAH (Alternate)SHRI B. B. BHATIA

SHRI D. D. GUPTA (Alternate)SHR' RAMESH KUMAR KApUR

SBRI AMIT CHC)WDHARY

SHRI S. SAMADDAR (Alternate)CITY ENGINEER

SHRI S. B. DANOAYACH

SHRI RAJAN B GULABANI (Alternate)DIRECT()R

SHRI R. ELAMARAM

ENGINEER -IN-CHIEF

SnRt RAMESH KUMAR KAPUR

DR A. K. RAY (Alternate)SHRI V. C. FRANCIS

SHRI T. K. BANDOPADHYAY (Alternate)MANAGING DIRECTOR

SHRI R. RAMESH

SHRI A. P. RAMACHANDRAN (Alternate)SHRI D'NESH KUMAR SAINI

SECRETARY GENERAL

SURI PARVIN V. SETH

SHRI CHANDRESH AMDANI (Allernat~)

DR Y. N. SHARMA

SHRI N. K. SINGH

SHRI D. D. GUPTA (Allernate)SHRI S. SUNDRARAM

SHRI YCJGESH VAKHARJA

SHRI AJIT KUMAR SHAH (Altel7UJte)SHrlMATI SEEMA VAIDYA

:~HRI R. S. N. DAnA (AllenuJt~)

Building Materials and Technology Promotion Council (Ministry of UrbanDevelopment), New Delhi

Infra Industries Ltd, Mumbai

Central Public Works Department, (Standards and Specifications), New Delhi

Rotomatic Containers Pvt Ltd, NasikPatton Tanks Ltd, Calcutta

Municipal Corporation of Greater Mumbai, MumbaiSintex Industries Ltd, Kalol (N. Gujarat)

U. P. Jal Nigam, LucknowGummadi Polymers (P) Ltd, MadrasEngineer-in-Chief's Branch, Army Headquarters, New DelhiUniplas India Ltd, New Delhi

IPCL, Baroda

Naptha Resins and Chemicals Pvt Ltd, BangaloreDevi Polymers (P) Ltd, Madras

Research Designs and Standards Organization (Ministry of Railway), LucknowFederation of All India Rotomoulders. New DelhiAll India Plastics Manufacturers' Association, Mumbai

Reliance Industries, MumbaiCentral Public Works Department, (Central Designs Organization), New Delhi

Glo.ss Pibre Technology Centre, CEAT Ltd, HyderabadRotomold (India) Pvt Ltd, Baroda

Carbon Everflow Ltd, Na.sik

10

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.

Copyright

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 ofimplementing 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 also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changesare needed; if the review indicates that changes are needed, it is taken up for revision. Users of IndianStandards should ascertain that they are in possession of the latest amendments or edition by referring tothe latest issue of 'BIS Handbook' and 'Standards: Monthly Additions'.

This Indian Standard has been developed from DOC CED 3(5585).

Amendments Issued Since PubUcation

Amend No. Date of Issue

BUREAU OF INDIAN STANDARDS

Text Affected

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