IS 15927 (Part 2) : 2012

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Indian Standard POLYETHYLENE FITTINGS FOR USE WITH POLYETHYLENE PIPES FOR THE SUPPLY OF GASEOUS FUELS -- SPECIFICATION
PART 2 SPIGOT FITTINGS FOR BUTT FUSION FOR SOCKET FUSION USING HEATED TOOLS AND FOR USE WITH ELECTRO FUSION FITTINGS

ICS 75.200; 83.140.30

© BIS 2012

BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002

March 2012

Price Group 7

Plastic Piping Systems Sectional Committee, CED 50

FOREWORD This Indian Standard (Part 2) was adopted by the Bureau of Indian Standards, after the draft finalized by the Plastic Piping Systems Sectional Committee had been approved by the Civil Engineering Division Council. The requirements for polyethylene fittings for use with polyethylene pipes for supply of gaseous fuels are covered by the following three parts. The other parts in the series are: Part 1 Fitting for socket fusion using heated tools Part 3 Electro fusion fittings This standard covers polyethylene spigot fittings in the nominal sizes 16 mm to 630 mm inclusive, where the sizes indicate compatibility of fitting with polyethylene pipes of the corresponding size in accordance with IS 14885 : 2001 `Polyethylene pipes for the supply of gaseous fuels -- Specification'. In the formulation of this standard considerable assistance has been derived from ISO 8085-2 : 2001 `Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels -- Metric series -- Specification: Part 2 Spigot fittings for butt fusion, for socket fusion using heated tools and for use with electro fusion fittings'. This standard does not purport to address all the safety requirements associated with the use of these fittings. It is the responsibility of users to establish safety and health practices. Regulatory norms associated with the product are to be adhered to. The composition of the Committee responsible for the formulation of this standard is given in Annex E. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the results of a test or analysis shall be rounded off in accordance with IS 2 : 1960 `Rules for rounding off numerical values (revised)'. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

IS 15927 (Part 2) : 2012

Indian Standard POLYETHYLENE FITTINGS FOR USE WITH POLYETHYLENE PIPES FOR THE SUPPLY OF GASEOUS FUELS -- SPECIFICATION
PART 2 SPIGOT FITTINGS FOR BUTT FUSION FOR SOCKET FUSION USING HEATED TOOLS AND FOR USE WITH ELECTRO FUSION FITTINGS
1 SCOPE This standard (Part 2) lays down requirements for buried polyethylene spigot fittings using heated tools, where the shape and composition of the fitting is suitable for fusion with polyethylene pipe complying with IS 14885 : 2001 `Polyethylene pipes for the supply of gaseous fuels -- Specification' and fittings conforming to IS 15927 (Part 1) : 2012 `Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels -- Specification: Part 1 Fitting for socket fusion using heated tools' and IS 15927 (Part 3) : 2012 `Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels -- Specification: Part 3 Electro fusion fittings' for the supply of gaseous fuels for the nominal out side diameters ranging from 16 mm to 630 mm with SDR 11 and SDR 17.6, material grades PE 80 and PE 100, pressure up to 5.5 bar ( see Note) and 7 bar and operating temperatures from ­5°C to 40°C.
NOTE -- 1 bar = 10 5 N/m2 = 0.1 MPa.

Title Polyethylene pipes for the supply of gaseous fuels -- Specification 15927 Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels -- Specification: (Part 1) : 2012 Fittings for socket fusion using heated tools (Part 3) : 2012 Electro fusion fittings 3 TERMINOLOGY For the purpose of this standard the following definitions shall apply. 3.1 Nominal Diameter of Fitting (dn) -- The nominal diameter of a fitting is taken as the nominal diameter of the corresponding pipe series. 3.2 Nominal Wall Thickness of Fitting (en) -- The nominal wall thickness of a fitting is taken as the nominal wall thickness of the corresponding pipe series. 3.3 Mean Outside Diameter -- Arithmetic mean of a number of measurements of the outer circumference of the tubular part of the fitting in any cross section, divided by (3.141 6) and rounded up to the nearest 0.1 mm. 3.4 Out of Roundness (Ovality) -- Maximum outside diameter minus the minimum outside diameter of the fitting measured in the same plane, parallel to the plane of the mouth. 3.5 Standard Dimension Ratio of Fitting (SDR) -- The SDR value of a fitting is taken as quotient of the nominal out side diameter and the nominal wall thickness of the corresponding pipe (expressed rounded to one decimal) and is given by:
SDR = dn en

IS No. 14885 : 2001

2 REFERENCES The following standards contain provisions which through reference in this text, constitute provisions of this standard. At the time of publication the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below: IS No. 2530 : 1963 Title Methods of test for polyethylene moulding materials and polyethylene compounds High density polyethylene materials for moulding and extrusion -- Specification (first revision) Plastics pipes selection, handling, storage and installation for potable water supplies -- Code of practice: Part 2 Laying and jointing of polyethylene (PE) pipes (first revision) 1

7328 : 1992

7634 (Part 2) : 2012

3.6 Wall Thickness of Fitting (E) -- Wall thickness at any point of the body of the fitting, which could be submitted to the full stress induced by the pressure of the gas in the piping system.

IS 15927 (Part 2) : 2012 3.7 Melt Flow Rate (MFR) -- Value relating to the viscosity of the molten thermoplastic material at a specified temperature and rate of shear. 3.8 Maximum Allowable Operating Pressure (MAOP) -- The highest effective pressure of the gas in the piping system expressed in bar, which is allowable in continuous use. It takes into account the physical and the mechanical characteristics of the components of piping system. It is given by the equation, a change of direction with a centre line radius greater than five times nominal bore. 3.19 Tee -- A fitting meant for taking branch connection from pipe, generally looking like English letter `T' in appearance with the branch outlet normally at the right angles to the pipe. 3.20 End Caps -- An end cap is an end plug used to close the open end of pipe. 3.21 Out of Square -- The deviation of the perpendicularity of the plane of the fitting end with respect to the longitudinal axis of the fitting. 4 SYMBOLS The dimensions and symbols used in this standard are shown in Fig. 1. 5 DESIGNATION 5.1 Fittings shall be designated according to the Grade of material used (see 5.2), nominal diameter (see 8.2.1) and standard dimension ratio (SDR) (see 3.5). For example PE 80 DN90 SDR 11 indicates that the fitting is made from the material grade PE 80, of nominal diameter 90 mm having SDR 11 rating. 5.2 Grade of Material 5.2.1 Fittings shall be classified according to the grade of material as given in Table 1 of IS 14885. 5.2.2 The maximum allowable hydrostatic design stress() of a fitting is obtained by applying the design safety coefficient of 2.0 minimum at 20°C to the MRS value of the material. 5.2.3 The raw material supplier shall give the material grading. 5.3 Colour The colour of the fittings shall be yellow/black for PE 80 and black for PE 100 fittings. 6 MATERIAL 6.1 The polyethylene compound used in the manufacture of fittings shall be polyethylene, which shall be produced by adding only those additives necessary for the manufacture and end use of fittings conforming to this standard and for their fusion jointing. It shall be free from visible water, when checked with unaided human eyes and shall comply with the requirements as specified in Table 2 of IS 14885. All additives shall be uniformly dispersed. The additives shall not have a negative influence on the performance with respect to fusibility. 2

MAOP =

20 MRS C (SDR-1)

3.9 Overall Service (Design) Coefficient (C) -- An overall coefficient with a value greater than 1, which takes into consideration service conditions as well as properties of the components of a piping system other than those represented in the lower confidence limit. For gas applications, C can have any value equal to or greater than 2.0. 3.10 Gaseous Fuel -- Any fuel which is in the gaseous state at a temperature of +15°C and a pressure of 1 bar. 3.11 Virgin Material -- Thermoplastics material in a form such as granules which has not been previously processed other than for compounding and to which no reprocessable or recyclable materials have been added. 3.12 Compound -- Homogeneous mixture of base polymer (PE) and additives for example anti-oxidants, pigments and UV-stabilizers at concentrations necessary for the particular application. 3.13 Lower Confidence Limit ( IcI) -- Quantity with the dimensions of stress, in MPa, which can be considered as a property of the material and represents the 97.5 percent lower confidence limit of the mean long-term hydrostatic strength at 20°C for 50 years determined by pressurizing internally with water. 3.14 Minimum Required Strength (MRS) -- Minimum value, in MPa, for long-term hydrostatic strength (LTHS) of the material. 3.15 Bend -- A curved cylinder enabling a change of direction with a centre line radius of between one and five times nominal bore. 3.16 Elbow -- A curved cylinder enabling a change of direction with a maximum centre line radius of one nominal bore. 3.17 Electro Fusion Fitting -- A fitting which contain an integral heating element(s) and whose performance complies with IS 15927 (Part 3). 3.18 Long Radius Bend -- A curved cylinder enabling

IS 15927 (Part 2) : 2012

D1 D3 L2

= mean outside diameter. The out-of-roundness (ovality) of the tubular part and the associated tolerances shall be as specified in Table 1. = minimum bore. The minimum value of the length L2 of the tubular part and the minimum value of the cut back length L1 shall be as specified in Table 1. = length of the tubular part, shall be such that the following is possible (in any combination): a) b) c) use of clamps required for butt fusion; assembly with a socket fusion fitting; and assembly with an electro fusion fitting.

L1 Es

= cut back length, may be determined by jointing with a length of pipe, provided that the wall thickness of the latter is equal to Es for its whole length. = fitting wall thickness.

FIG. 1 DIMENSIONS OF SPIGOT F ITTINGS 6.2 Anti-oxidant The percentage of anti-oxidant used shall not be more than 0.3 percent by mass of finished resin as per IS 2530. 6.3 U.V. Stabilizer The percentage of U.V. stabilizer used shall not be more than 0.5 percent by mass of finished resin. 6.4 Carbon Black Content (for Black Compounds Only) When tested, in accordance with IS 2530, the carbon black content shall be within 2.5 ± 0.5 percent. 6.5 Carbon Black Dispersion (for Black Compounds Only) When tested, in accordance with IS 2530, the dispersion of carbon black shall be satisfactory. 6.6 Pigment Dispersion (for Non-black Compounds Only) When tested as per Annex E of IS 14885, the grading should be 3. 6.7 Effects of Gas Constituents on the Hydrostatic Strength When tested as per 5.5 of IS 14885, the fitting shall pass the test. 3 6.8 Compatibility Conformity to 9 shall be established by the fitting manufacturer to ensure compatibility of the fittings with polyethylene pipes conforming to IS 14885. The polyethylene pipe used for this demonstration, the fusion conditions and the tooling shall be as detailed in Annex A and Annex B as applicable. 7 GENERAL REQUIREMENTS 7.1 Multiple Connections If a fitting includes one or more spigot ends, these shall also conform to this standard. 7.2 Appearance of the Fitting When viewed without magnification, the internal and external surfaces of the fitting shall be smooth, clean and free from scoring, cavities and other surface defects which might prevent conformity to this standard. 7.3 Appearance of the Joint When viewed without magnification, the internal and external surfaces of the pipe and fitting after fusion jointing shall be free from melt exudation (spillage) outside the confines of the fitting. 8 GEOMETRICAL CHARACTERISTICS 8.1 General The minimum wall thickness E of the fitting

IS 15927 (Part 2) : 2012 corresponding to a particular SDR rating for production shall be in accordance with Table 4 of IS 14885. The dimensions of the fittings shall be measured, not less than 24 h after manufacture, and after conditioning for at least 4 h without any support for re-rounding of the fusion ends. The fittings are designated by the nominal diameter of the spigot end, which corresponds to the nominal outside diameter (dn) of the pipe with which these are to be used. 8.2 Spigot Dimensions (see Fig. 1) 8.2.1 Nominal Diameter The nominal diameters for fittings covered in this standard are 16 mm to 630 mm (see Table 1). Fittings are intended for use with pipes having dimensions and tolerances, as given in IS 14885. Fittings shall be graded according to the manufacturing tolerances on mean outside diameters as Grade A and Grade B as given under: Grade A -- For all nominal outside diameters, the tolerance equals 0.009 dn rounded up to the nearest 0.1 mm with a minimum value of 0.3 mm and a maximum value of 10 mm. b) Grade B -- For all nominal outside diameters, the tolerance equals 0.006 dn rounded up to the nearest 0.1 mm with a minimum value of 0.3 mm and a maximum value of 4 mm. a)

Table 1 Diameters and Lengths of Spigot Fittings (see Note 1) (Clause 8.2.1) All dimensions in millimetres.
Sl Nominal Mean Outside Diameter of Fitting No. Diameter D1 Max D1 Min dn Max (1) i) ii) iii) iv) v) vi) vii) viii) ix) x) xi) xii) xiii) xiv) xv) xvi) xvii) xviii) xix) xx) xxi) xxii) xxiii) xxiv) xxv) (2) 16 20 25 32 40 50 63 75 90 110 125 140 160 180 200 225 250 280 315 355 400 450 500 560 630 Min (3) 16 20 25 32 40 50 63 75 90 110 125 140 160 180 200 225 250 280 315 355 400 450 500 560 630 Grade A Grade B (4) (5) -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 282.6 317.9 358.2 403.6 454.1 504.5 565.0 635.7 16.3 20.3 25.3 32.3 40.4 50.4 63.4 75.5 90.6 110.7 125.8 140.9 161.0 181.1 201.2 226.4 251.5 281.7 316.9 357.2 402.4 452.7 503.0 563.4 633.8 Ovality (Out- Minimum Minimum Cut Bore Back Length of-Roundness) L1 Min D3 Min Max (6) 0.3 0.3 0.4 0.5 0.6 0.8 0.9 1.2 1.4 1.7 1.9 2.1 2.4 2.7 3.0 3.4 3.8 4.2 4.8 5.4 6.0 6.8 7.5 8.4 9.5 Minimum Length of Tubular Part (see Note 2) L2 Min

(7) 9 13 18 25 31 39 49 59 71 87 99 111 127 143 159 179 199 223 251 283 319 359 399 447 503

(8) 25 25 25 25 25 25 25 25 28 32 35 38 42 46 50 55 60 75 75 75 75 100 100 100 100

(9) 41 41 41 44 49 55 63 70 79 82 87 92 98 105 112 120 129 139 150 164 179 195 212 235 255

NOTES 1 Typical geometry of the spigot end fittings (90°Tee, 45°Tee, 90°Elbow, 45°Elbow, End caps, Reducers, etc) are as shown in Fig. 2A and Fig. 2B for guidance only. 2 Spigot fittings may be supplied with a shorter tubular part for use in factory assemblies or with appropriate electro fusion fittings.

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IS 15927 (Part 2) : 2012

Pipe Size mm 20 25 32 50 63 75 90 125 180
1)

A Min 50 56.5 64 84 100 113 137 162 213

B Min 40 43 46 55 63 70 79 87 106

1)

See 8.2 --This dimension also applies to caps, reducers and 45° elbows.

2A Typical Dimensions for Equal Tees, Unequal Tees and 90° Elbows

Pipe size in mm 50 63 75 90 125 180
1)

A1) Spigot length Minimum 100 112 118 131 140 160

See 8.2.

2B Typical Spigot Dimensions for Fittings Designed for Clamping Either Side of an Electrofusion Fitting

FIG. 2 TYPICAL SPIGOT END FITTINGS 5

IS 15927 (Part 2) : 2012 8.3 Wall Thickness ES of the Fitting 8.3.1 Minimum Wall Thickness of the Corresponding Pipes Table 2 gives minimum wall thicknesses e Min of fittings for SDR 11 and 17.6 which are commonly used. For specific applications, other SDR values may be used, taken from any SDR ratings given in IS 14885. Table 2 Minimum Wall Thicknesses All dimensions in millimetres.
Sl No. Nominal Diameter dn (2) 16 20 25 32 40 50 63 75 90 110 125 140 160 180 200 225 250 280 315 355 400 450 500 560 630 Minimum Wall Thickness eMin SDR 17.6 (3) 2.3 2.3 2.3 2.3 2.3 2.9 3.6 4.3 5.2 6.3 7.1 8.0 9.1 10.3 11.4 12.8 14.2 15.9 17.9 20.2 22.8 25.6 28.4 31.9 35.8 SDR 11 (4) 3.0 3.0 3.0 3.0 3.7 4.6 5.8 6.8 8.2 10.0 11.4 12.7 14.6 16.4 18.2 20.5 22.7 25.4 28.6 32.3 36.4 40.9 45.5 50.9 57.3

Table 3 Out-of-Square Values for Fitting Ends (Clause 8.3.3)
Sl No. (1) i) ii) iii) iv) v) vi) dn 63 125 180 250 355 Pipe Size mm (2) 63 < dn < dn < dn < dn < dn 125 180 250 355 630 Maximum Out-of-Square Values for Fitting Ends mm (3) 1.5 2 3 4 5 7

9 PERFORMANCE REQUIREMENTS 9.1 General The test assemblies shall be prepared according to Annex A or Annex B, as applicable. Performance tests for butt fusion fittings apply to the whole assembly. All fusion joints shall be prepared in accordance with Annex A. Performance tests for socket fusion fittings apply to the whole assembly and shall be prepared in accordance with Annex A of IS 15927 (Part 1). Performance tests for electro fusion fittings apply to the whole assembly, including electro fusion joints prepared according to the electro fusion fittings manufacturer's fusion conditions. All fusion joints shall be prepared in accordance with Annex B. Fittings shall be used as per MAOP values given in 3.8, with a minimum C factor of 2.9. 9.2 Hydraulic Characteristics A fitting joint assembly prepared as per Annex A or Annex B and tested in accordance with Annex A of IS 14885 shall conform to the requirements given in Table 4. In the event of modification of the fusion jointing parameters, the manufacturer shall ensure that the joint conforms to requirements of this clause. 9.3 Melt Flow Rate MFR of the material taken from the fitting, when tested as per IS 2530 at 190°C with nominal load of 5 kgf and when tested from a composite sample of three fittings shall not differ by more than 30 percent from the values specified by the raw material manufacturer. The change of MFR by processing that is the difference between the measured value for material from the

(1) i) ii) iii) iv) v) vi) vii) viii) ix) x) xi) xii) xiii) xiv) xv) xvi) xvii) xviii) xix) xx) xxi) xxii) xxiii) xxiv) xxv)

8.3.2 Wall Thickness ES of the Fusion End The minimum wall thickness of the fusion end-piece ES shall be equal to the nominal wall thickness of the corresponding pipe rating (SDR) with tolerances as in IS 14885, except between the plane of the entrance face and a plane parallel to it at a distance greater than 0.01 dn ± 1 mm, where a thickness reduction for example a chamfered edge shall be permissible. 8.3.3 Out-of-Square Values of Fitting Ends The out-of-square value of the fittings ends shall be as per Table 3.

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IS 15927 (Part 2) : 2012 Table 4 Hydraulic Pressure Test Characteristics (Clause 9.2)
Sl No. (1) Property (2) Requirement (3) Failure time 100 a) b) c) d) Test Parameters (4) End caps orientation Conditioning time Type of test Pressure calculated to produce the following circumferential (hoop) stress : 1) PE 80 pipe 2) PE 100 pipe 3) Test temperature End caps orientation Conditioning time Type of test Pressure calculated to produce the following circumferential ( hoop) stress: 1) PE 80 pipe 2) PE 100 pipe 3) Test temperature End caps orientation Conditioning time Type of test Pressure calculated to produce the following circumferential ( hoop) stress: 1) PE 80 pipe 2) PE 100 pipe 3) Test temperature : : : Not applicable 1h Water-in-water Method of Test , Ref to Annex of IS 14885 (5) A

i) Acceptance test at 20°C, h

ii) Acceptance test at 80°C, h

Failure time 165

a) b) c) d)

: : : : : :

10 MPa 12.4 MPa 20 ± 1°C Not applicable 12 h Water-in-water

A

iii) Type test at 80°C, h

Failure time 1 000 a) b) c) d)

: : : : : : : : : :

4.6 Mpa 5.5 Mpa 80 ±1°C Not Applicable 12 h Water-in-water

A

4 MPa 5 MPa 80 ± 1°C

NOTE -- For hydrostatic strength test at 80°C, only brittle failure shall be taken in to account. If ductile failure occurs before the required time, a lower stress shall be selected and the minimum test time shall be obtained from Table 5.

Table 5 Hydrostatic Strength (80°C) -- Stress/Minimum Failure Time Correlation (Table 4)
Sl No. Stress MPa PE 80 (1) i) ii) iii) iv) v) vi) vii) (2) 4.6 4.5 4.4 4.3 4.2 4.1 4.0 (3) 165 219 293 394 533 727 10000 (4) 5.5 5.4 5.3 5.2 5.1 5.0 -- Minimum Failure Time h Stress MPa Minimum Failure Time h PE 100 (5) 165 233 332 476 688 10000 --

fitting and the measured value from the raw material shall not be more than 25 percent. 9.4 Density When tested as per Annex A of IS 7328, it shall meet the requirements as given in Table 2 of IS 14885. 9.5 Thermal Stability The minimum oxidation induction time (OIT) of the material from the fitting shall be 20 min when tested as per Annex D of IS 14885. 7

9.6 Volatile Matter Content When tested in accordance with Annex H of IS 14885, the value of volatile matter content shall be 350 mg/kg. 9.7 End Reversion Test This test is applicable to spigot fittings of size 180 mm. Spigot fittings after subjected to reversion test, as per Annex C, shall comply with the following requirements:

IS 15927 (Part 2) : 2012 a) All specimen shall have a diameter within the range specified in IS 14885, and b) Joint strength test shall be carried out as per Annex D. 9.8 Decohesive Strength Joint of spigot end fitting when tested as per Annex D, the failure of joint shall be ductile in nature. 10 ACCEPTANCE TESTS Acceptance tests are carried out on samples selected from a lot for the purpose of acceptance of the lot. Sample for acceptance tests shall be prepared in accordance with Annex A, Annex B and Annex A of IS 15927 (Part 1) as applicable. 10.1 Lot For moulded fittings a lot shall be defined as the production of a machine from the time it commences to produce fittings complying with this standard until the machine is closed down. A production lot shall not exceed either 170 h or 10 000 components, whichever is less. Any break in production that exceeds 8h shall be considered as a termination of lot. Any change over in raw material lot number shall be also considered as a termination of a lot. For ascertaining conformity of the lot requirements of this standard the number of samples shall be selected in accordance with the provisions as mentioned under Table 6 and tested for compliance. When a lot acceptance is carried out the sampling plans shall be as per Table 7 and Table 8. The number of fittings to be selected from each lot shall depend on the size of the lot and shall be in accordance with col 1 and col 2 of Table 7. Each fitting so selected shall be examined for proper workmanship, appearance and dimensional requirements. Any fitting failing in one or more of these requirements shall be considered as defective. The lot shall be considered as conforming to requirements of this standard, if the number of defective fittings found in the first samples are less than or equal to the corresponding acceptance number given in col 5 of Table 7. The lot shall be deemed not to have met these requirements, if the number of defective found in the first sample is greater

Table 6 Acceptance Tests (Clause 10.1)
Sl No. (1) i) ii) iii) iv) v) vi) vii) viii) ix) x) Description of Test (2) Visual appearance (see 7.2) Dimensions (see 8.2) Melt flow rate (see 9.3) Density (see 9.4) Carbon black content (see 6.4) Carbon black dispersion (see 6.5) Pigment dispersion (see 6.6) Thermal stability (see 9.5) Hydrostatic resistance test at 20°C (see 9.2) Hydrostatic resistance test at 80°C (165 h) (see 9.2) Sample Size Table (3) 7 7 8 8 8 8 8 8 8 8 Method of Test, Ref to (4) -- -- IS 2530 Annex A of IS 7328 IS 2530 IS 2530 Annex E of IS 14885 Annex D of IS 14885 Annex A of IS 14885 Annex A of IS 14885

Table 7 Scale of Sampling for Visual and Dimensional Requirements (Clause 10.1)
Sl No. (1) i) ii) iii) iv) v) vi) vii) No. of Fittings (2) Up to 150 151-280 281-500 501-1 200 1 201-3 200 3 201-10 000 Above 10 000 Sample No. (3) First Second First Second First Second First Second First Second First Second First Second Sample Size (4) 13 13 20 20 32 32 50 50 80 80 125 125 200 200 Cumulative Sample Size (5) 13 13 20 40 32 64 50 100 80 160 125 250 200 400 Acceptance No. (6) 0 1 0 3 1 4 2 6 3 8 5 12 7 18 Rejection No. (7) 2 2 3 4 4 5 5 7 7 9 9 13 11 19

8

IS 15927 (Part 2) : 2012 than or equal to the corresponding rejection number given in col 6 of Table 7. If however, the number of defective found in the first sample lies between the corresponding acceptance and rejection numbers given in col 6 and col 7 of Table 7, the second sample of the size given in col 4 of Table 7 shall be taken and examined for these requirements, if the number of defective found in the cumulative samples is less than or equal to the corresponding acceptance number given in col 6 of Table 7 otherwise not. Table 8 Sampling Plan for Hydraulic Characteristics, MFR, Thermal Stability and Joint Hydrostatic Strength (Clause 10.1)
Sl No. (1) i) ii) iii) iv) v) No. of Fittings (2) Up to 800 801-1 600 1 601-2 400 2 401-3 200 Above 3 200 Sample Size (3) 3 4 5 6 7

12 MARKING 12.1 All fittings shall be indelibly marked using characters of minimum 3 mm height for sizes dn 90 mm and minimum 5 mm height for sizes dn > 90 mm . 12.2 The following information shall be given on the fitting: a) b) c) d) Manufacturer's identity; Nominal diameter and fittings rating (SDR); Date of manufacture or batch No.; and Material (PE + Designation).

12.2.1 All fittings shall be permanently and legibly marked in such a way that the marking does not initiate cracks or other types which adversely influence the performance of the fitting. 12.2.2 If printing is used the colour of the printed information shall differ from the basic colour of the product. 12.2.3 The marking shall be such that it is legible without magnification. 12.2.4 Any additional information (such as barcode) may be printed on a label associated with the fitting. 12.3 All marking shall remain legible under normal handling, storage and installation procedures. The method of marking shall not prevent the fitting from meeting the requirements of this standard. 12.4 BIS Certification Marking The fittings may also be marked with the Standard Mark. 12.4.1 The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The details of conditions under which a licence for use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. 13 PACKAGING OF FITTINGS The fittings shall be packed in bulk or individually sealed in transparent polyethylene or equivalent bags of at least 75µ thickness in order to prevent deterioration. The outer pack shall be suitable for stacked storage and be marked with the information required in 12.2 (a), (b) and (c) together with fitting type and quantity in the pack. They shall be packed appropriately in cardboard boxes or cartons.

11 TYPE TESTS 11.1 Type tests are intended to prove the suitability and performance of a new composition of raw material, a new technique or new size of fitting. Such tests therefore need to be applied only when a change is made in composition or method of manufacturing or a new size of a fitting is to be introduced. Sample for type tests shall be prepared in accordance with Annex A and/or Annex B and Annex A of IS 15927 (Part 1) as applicable. 11.2 Samples of fittings should be selected at random for each type test and shall be tested for compliance with the requirements as indicated against each test as shown in Table 9. Table 9 Type Tests
Sl No. (1) Description of Test (2) Sample Size (3) 3 3 3 Method of Test , Ref to (4) Annex H of IS 14885 Annex A of IS 14885 Clause 5.5 of IS 14885

i) Volatile matter content (see 9.6) ii) Hydrostatic resistance test at 80°C (1 000 h) (see 9.2) iii) Effects of gas constituents on the hydrostatic strength (see 6.7)

9

IS 15927 (Part 2) : 2012

ANNEX A (Clauses 6.8, 9.1, 9.2, 10 and 11.1)
PREPARATION OF TEST ASSEMBLIES (BUTT FUSION) A-1 ASSEMBLY COMPONENTS Fittings selected for test shall have dimensions conforming to Tables 1, 2 and 3. A-2 SPECIMEN ASSEMBLY For testing, pipe conforming to IS 14885 shall be used. In case of type testing, pipe from coils should be used for sizes 125 mm. For acceptance testing straight pipe may be used. Butt fusion jointing process and parameters shall be as per IS 7634 (Part 2), although variations may be agreed where justified. The preparation and assembly of test samples shall be carried out using appropriate tooling. Prior to fusion, pipes and fittings shall be conditioned in an environment maintained at a temperature of 27 ± 2°C for at least 8 h. A-3 TOOLS REQUIRED Apart from the tools usually used in plastic pipeline installation such as pipe cutters or saws with cutting guide, a special machine is necessary for making butt fusion joints. This jointing machine must satisfy the following requirements: a) Clamping devices must be able to clamp the fittings securely without damaging their surfaces. b) Roundness of the fusion zone must not be adversely affected and it must be possible to clamp component flush. c) Machine must be sufficiently robust to withstand the pressure applied during the jointing process without deformation which would adversely affect the joint. d) Pressure and temperature cycle during the butt fusion process shall be as recommended by the fitting manufacturer. A-3.1 Heating Element The accuracy of the temperature measurement must be verified before jointing process commences in order to check the thermostats. Instruments equipped with a sensor for surface temperature measurement are suitable for this. The accuracy of the element temperature must also be monitored from time to time during jointing operations. A-4 FUSION PROCESS The jointing surfaces must only be prepared immediately prior to fusion jointing. If necessary, when temperatures fall below +5°C or rise above 45°C, take appropriate action in the working area to produce a temperature which ensures satisfactory operation and prevents any interference with manual activities. A more uniform temperature profile around the entire pipe/fitting circumference shall be achieved. For butt fusion the components being jointed (pipe/ fitting or fitting/fitting) are heated to 210°C to 230°C. Butt fusion joints may only be made using machines which permit control of the pressure exerted. Assemblies may contain more than one fitting provided that the free length of pipe between fittings of any type is not less than, a) 375 mm for fittings 125 mm diameter; and b) Three times the pipe outside diameter for fittings > 125 mm. The specimen shall be closed with pressure tight end caps which shall be provided with connections for the entry of water and release of air.

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IS 15927 (Part 2) : 2012

ANNEX B (Clauses 6.8, 9.1 and 11.1)
PREPARATION OF TEST ASSEMBLIES (ELECTRO FUSION ) B-1 ASSEMBLY COMPONENTS Fittings selected for test shall have dimensions as given in Tables 1, 2 and 3. B-2 SPECIMEN ASSEMBLY For testing, electro fusion couplers conforming to Part 3 of this standard shall be used. Prior to fusion, fittings shall be conditioned in an environment maintained at a temperature as per the requirement of the test. B-3 REQUIRED TOOLS Apart from the tools usually used in plastic pipeline installation such as pipe cutters or saws with cutting guide, a special machine is necessary for making electro fusion joints. This jointing machine must satisfy the following requirements: Control box having required output voltage as per the requirement of the electro fusion fitting; b) The clamping devices must be able to clamp the fittings securely without damaging their surfaces and the roundness of the fusion zone must not be adversely affected; and a) c) The fusion parameters during fusion process shall be as recommended by the electro fusion fitting manufacturer.

B-4 LOT ACCEPTANCE TESTING AND TYPE TESTING Prior to fusion electro fusion couplers and spigot end fittings shall be conditioned in an environment maintained at a temperature of ­5 ± 2°C for at least 2 h and shall be fused in this environment. The output voltage of the fusion box shall be measured using a true rms voltmeter with an accuracy of at least ± 0.1 percent and a 10 mV resolution in the 0 V to 100 V range. The voltage shall remain constant through out the fusion time. The electro fusion couplers shall be fused for the time stated on the fitting barcode and shall be allowed to cool for the time indicated before handling. Assemblies may contain more than one fitting. The specimen shall be closed with pressure tight end caps which shall be provided with connections for the entry of water and release of air.

ANNEX C (Clause 9.7)
END REVERSION TEST FOR SPIGOT END FITTINGS C-1 APPARATUS The apparatus shall comprise a bath containing water controlled at a temperature of 80 ± 2°C. A holder shall be used that keeps the test sample submerged in the bath and prevent the test section being constrained by the apparatus. C-2 TEST PIECES For all sizes circumferential lines shall be marked at the mid point of the spigot. For all sizes equal to or greater than 50 mm additional lines shall be marked at a maximum of 0.1 × spigot diameter from each end of spigot. C-3 PROCEDURE The specimen shall be immersed in a hot water bath at a temperature of 80 ± 2°C for a minimum period of 120 min. After the specified immersion time, the specimen shall be removed and allowed to cool naturally to 27 ± 2°C. The diameters at the marks shall be measured with pi tape or dial vernier having an accuracy of 0.02 mm. The results are the averages of the readings from each pair of marks and shall be rounded to 0.05 mm.

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IS 15927 (Part 2) : 2012

ANNEX D (Clauses 9.7 and 9.8)
DECOHESIVE STRENGTH D-1 PRINCIPLE A test piece machined from a butt fused PE pipe joint to give a waisted section is subjected to a tensile load at a constant pulling rate until failure occurs. When loading the test piece in a tensile testing machine, the stress is concentrated through the jointed region and ultimate failure is in the vicinity of the joint. The test is conducted at a constant temperature of 27 ± 2°C. The failure mode is used as criteria for the evaluation of the butt fused joint. D-2 APPARATUS D-2.1 Tensile testing machine capable of accommodating a test piece elongation of 25 percent and sustaining constant test speed of 5 ± 1 mm/min and equipped with means for recording the consequent applied force and a device to detect test piece failure. D-2.2 Clamping device, equipped with bars fitting in to traction holes machined in the test piece. D-2.3 Measuring device, capable of determining the width and thickness of the test piece to within 0.05 mm (see D-5.1). D-2.4 Template with the geometry of the test piece (see Fig. 3 and Fig. 4), to mark the shape of the test piece to be machined. D-3 TEST PIECES D-3.1 Test pipes used to produce test samples shall be prepared by sampling as specified in Table 5 and 6. The number of test pieces shall depend upon the nominal outside diameter dn of the pipe, as given in Table 10. One test specimen shall be taken at the position of maximum misalignment. The other test specimen shall be taken around the circumference of the joint. Table 10 Number of Test Specimen
Sl No. (1) i) ii) iii) iv) Nominal Outside Diameter dn of the Pipe mm (2) 090 dn <110 110 dn <180 180 dn <315 315 dn Number of Test Specimen (3) 2 4 6 7

D-3.2 Preparation D-3.2.1 General The butt fused PE pipe joints shall be prepared in accordance with the Annex A. For each test piece required, a strip shall be machined out along the longitudinal direction of the pipe, across the joint. The strip shall be further machined to prepare a test piece with dimensions conforming to, a) Table 11 and Fig. 3 for pipes with wall thickness e < 25 mm (Type A); and b) Table 11 and Fig. 4 for pipes with wall thickness e 25 mm (Type B). using a template to ensure that the joint interface will be aligned with the cross-section of the centre of the waist of the test piece of Type A or Type B, as applicable. The fusion bead may be removed. D-3.2.2 Type A Test Piece The dimensions and shape of the Type A test piece shall conform to Fig. 3 and Table 11.

F IG. 3 MACHINED TYPE A TENSILE TEST PIECE (FOR E < 25 mm)

FIG. 4 MACHINED TYPE B TENSILE TEST PIECE (FOR E > 25 mm) 12

IS 15927 (Part 2) : 2012 D-3.2.3 Type B Test Piece The dimensions and shape of the Type B test piece shall conform to Fig. 4 and Table 11. The waist of the test piece shall be formed by drilling or machining holes with their centres 35 mm or 45 mm apart, as applicable, so that the centre lines of the holes lie in the same plane as the joint interface, and then cutting towards the holes from the corresponding edge of the strip. The faces of the test piece waist shall be smooth. The finish of the remaining edges is not critical. D-4 CONDITIONING Immediately prior to testing in accordance with D-5, condition each test piece in air for a minimum of 6 h at a temperature of 27 ± 2°C, starting the period of conditioning at a time such that testing will not be carried out less than 24 h after the butt fusion of the joint. D-5 PROCEDURE D-5.1 Measure the thickness of the test piece as the thickness of the pipe wall and the width of the test piece as the distance between the two holes drilled at the joint (D) for test pieces of Type A (see Table 11 and Fig. 3) or as the width of the narrow portion (D) for test pieces of Type B (see Table 11 and Fig. 4). D-5.2 Place the test piece in the clamping device of the tensile-testing machine, so that the direction of the force applied to the test piece is perpendicular to the butt fusion joint. D-5.3 Pull the test assembly at a speed of 5 ± 1 mm/min. D-5.4 Apply the tensile force until complete failure of the test piece occurs. D-5.5 Record the type of failure as ductile or brittle, as characterized by the ductile and brittle failure modes shown in Fig. 5. Only failures at the butt fusion joint shall be taken into account.

Table 11 Dimensions of Type A and B Test Pieces (Clause D-3.2.3) All dimensions in millimetres.
Sl No. (1) i) ii) iii) iv) v) vi) vii) viii) Symbol Description Dimensions of Type A Test Pieces dn 160 (4) 180 60 ± 3 Not applicable 25 ± 1 5 ± 0.5 90 ± 5 Full wall thickness 20 ± 5 dn > 160 (5) 180 80 ± 3 Not applicable 25 ± 1 10 ± 0.5 90 ± 5 Full wall thickness 20 ± 5 Dimensions of Type B Test Pieces (6) 250 100 ± 3 25 ± 1 25 ± 1 25 ± 1 165 ± 5 Full wall thickness 30 ± 5

(2) A B C D E F G H

(3) Overall length, Min Width at ends Length of narrow parallel sided portion Width of narrow portion Radius Initial distance between grips Thickness Diameter of the traction holes

FIG. 5 TYPICAL FAILURE MODES CHARACTERIZED BY DUCTILE FAILURE MODE (LEFT HAND-S IDE PICTURE ) AND BRITTLE FAILURE MODE (R IGHT-HAND-SIDE PICTURE) 13

IS 15927 (Part 2) : 2012

ANNEX E (Foreword)
COMMITTEE COMPOSITION Plastic Piping System Sectional Committee, CED 50
Organization Central Institute of Plastic Engineering and Technology, Chennai Bharat Sanchar Nigam Ltd, New Delhi Central Building Research Institute, Roorkee Central Institute of Plastic Engineering and Technology, Chennai Central Public Health Environmental Engineering Organization, New Delhi Central Public Works Department, New Delhi Chemplast Sanmar Ltd, Chennai Chennai Metropolitan Water Supply and Sewerage Board, Chennai Chloroplast, Kerala Delhi Development Authority, New Delhi Delhi Jal Board, New Delhi Directorate General of Supplies & Disposals, Mumbai Engineer-in-Chief's Branch, New Delhi EPC Industries Pvt Limited, Nasik Finolex Industries Limited, Pune GAIL (India) Ltd, Noida Haldia Petrochemicals Ltd, Kolkata Indian Oil Corporation Ltd (Polymer Division), Panipat Jain Irrigation System Limited, Jalgaon Kolkata Municipal Corporation, Kolkata Municipal Corporation of Greater Mumbai, Mumbai National Environmental Engineering Research Institute, Nagpur Public Health Engineering Department, Jaipur Reliance Industries Limited, Mumbai RITES, New Delhi Rural Water Supply and Sanitation Department, Orissa Representative(s) DR S. K. NAYAK (Chairman ) CHIEF ENGINEER SHRI A. K. NAGAR (Alternate) DR S. P. AGARWAL SHRI AJAY SINGH (Alternate) DR K. PALANIVELU SHRI R. K. DWIVEDI (Alternate) ADVISER ASSISTANT ADVISER (Alternate) CHIEF ENGINEER SUPERINTENDING ENGINEER (Alternate) REPRESENTATIVE SHRI S. RANGANATHAN SHRI V. SIVAKUMARAN (Alternate) SHRI N. SURESH SHRI T. S. MANOJ (Alternate) SUPERINTENDING ENGINEER EXECUTIVE ENGINEER (Alternate) ENGINEER-IN-C HIEF CHIEF ENGINEER (Alternate) SHRI A. K. JAIN SHRI A. K. M. KASHYAP (Alternate) SHRI S. K. AGGARWAL SHRI A. K. RAY (Alternate) SHRI K. L. KHANNA SHRI K. G. SOMAN (Alternate) SHRI V. V. KHANDEKAR SHRI S. B. SINGH (Alternate) SHRI RAJNEESH YADAV SHRI MANISH KHANDELWAL (Alternate) REPRESENTATIVE SHRI ABHAY MULAY SHRI R. V. PRABHU (Alternate) DR H. C. MRUTHYUNJAYA SHRI S. NARAYANASWAMY (Alternate) SHRI D. K. SANYAL SHRI A. K. BISWAS (Alternate) DEPUTY HYDRAULIC ENGINEER EXECUTIVE ENGINEER (Alternate) DR M. V. NANOTI DR S. P. PANDE (Alternate) SUPERINTENDING ENGINEER EXECUTIVE ENGINEER (Alternate) SHRI S. V. RAJU SHRI MIHIR BASNERJI (Alternate) SHRI C. K. SHARMA REPRESENTATIVE

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IS 15927 (Part 2) : 2012
Organization Supreme Industries Limited, Jalgaon Tamil Nadu Water Supply and Drainage Board, Chennai In personal capacity (Plot No. 176, 6th Avenue, Anna Nagar West, Chennai 600 040) In personal capacity (A-59, Sector 35, Noida 201 301) BIS Directorate General Representative(s) SHRI G. K. SAXENA SHRI G. S. DIKONDWAR (Alternate) JOINT CHIEF ENGINEER ENGINEERING DIRECTOR (Alternate) SHRI G. K. SRINIVASAN SHRI KANWAR A. SINGH SHRI A. K. SAINI, Scientist `F' and Head (CED) [Representing Director General (Ex-officio)] Member Secretary SHRI D. K. AGRAWAL Scientist `F' (CED), BIS

Polyolefins and GRP Piping System Subcommittee, CED 50 : 1
In personal capacity (A-59, Sector 35, Noida 201 301) Amiantit Fibre Glass Industries India Pvt Ltd, North Goa Assam Gas Company Limited, Assam Bhimrajka Impex Limited, Mumbai Central Ground Water Board, Haryana Central Public Works Department, New Delhi Chennai Water Supply & Sewerage Board, Chennai Delhi Jal Board, New Delhi Department of Telecommunications, New Delhi Directorate General of Supplies & Disposals, New Delhi Engineer-in-Chief's Branch, New Delhi Engineers (India) Ltd, New Delhi GAIL (India) Limited, New Delhi Godavari Polymers Pvt Limited, Secunderabad Indraprastha Gas Limited, New Delhi Industrial Toxicology Research Centre, Lucknow Jain Irrigation Systems Limited, Jalgaon KITEC Industries India Limited, Mumbai Kriti Industries (India) Limited, Indore Kimplas Piping Systems Ltd, Nasik SHRI KANWAR A. SINGH (Convener) SHRI PRADEEP MAHODEO THORAT SHRI RELINDO ALBERTO (Alternate) SHRI B. C. SHARMA SHRI AJOY K. BHATTACHARYYA (Alternate) SHRI V. K. SHARMA SHRI VINOD BHIMRAJKA (Alternate) REPRESENTATIVE CHIEF ENGINEER SUPERINTENDING ENGINEER (Alternate) SHRI S. RANGANATHAN JOINT CHIEF ENGINEER (Alternate) ENGINEER-IN-C HIEF CHIEF ENGINEER (Alternate) SHRI A. K. NAGAR SHRI CHANDRA BHUSHAN (Alternate) SHRI RAJENDRA PRASAD SHRI P. JAYAKUMARAN NAIR (Alternate) SHRI AJAY SHANKER SUPERINTENDING ENGINEER (Alternate) REPRESENTATIVE SHRI RAJNEESH YADAV SHRI C. VENKATESH RAO SHRI G. SRIDHAR RAO (Alternate) REPRESENTATIVE DR V. P. SHARMA DR VIRENDRA MISRA (Alternate) DR H. C. MRUTHYUNJAYA SHRI M.R. KHARUL (Alternate) SHRI P. S. KOLASKAR SHRI MAJORANJAN G. CHOUDHARY SHRI S. K. KABRA SHRI B. R. NAIK (Alternate) SHRI PRAMOD MULGUND SHRI VIJAY JADHAV (Alternate)

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IS 15927 (Part 2) : 2012
Organization Mahanagar Gas Limited, Mumbai Maruthi Tubes Pvt Limited, Secunderabad National Environmental Engineering Research Institute, Nagpur Ori-Plast Limited, Kolkata Reliance Industries Limited, Mumbai Strategic Engineering (P) Ltd, Chennai Telecommunications Consultant India Limited, New Delhi In personal capacity (313/314, Raikar Chambers, Govandi (E), Mumbai 400 088) Representative(s) SHRI GARY MORGAUN GENERAL MANAGER (Alternate) SHRI MANCHAALA RAGHAVENDRA SHRI M. NAGESH KUMAR (Alternate) SHRI S. S. DHAGE SHRI S. K. NAYAK SHRI A. C. JENA (Alternate) SHRI YOGESH KUMAR SHRI DHAVAL SHAH (Alternate) SHRI G. S. VISWANATH DR M. RAMAKIRISHNAN (Alternate) SHRI C. B. NAIR SHRI RAVINDRA SHAH (Alternate) SHRI A. R. PARASURAMAN

16

Bureau of Indian Standards BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending 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 form without 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 also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes 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 by referring to the latest issue of `BIS Catalogue' and `Standards : Monthly Additions'. This Indian Standard has been developed from Doc No.: CED 50 (7475).

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