TESTING

Types of testing and parameters tested

In the quest for quality of the highest order, our pipes are subjected to the most rigorous of tests

Visual Appearance

The internal and external surfaces of each pipe shall be inspected for its smoothness, cleanness and freeness from any defects. The ends shall be clean and square with the axis of the pipe.

Density

Density of the material of the pipe shall be within 1.40 to 1.46 g/cm 3 when determined in accordance with IS 13360 (Part 1 / Sec 3): 1995

Resistance to external blows at 0º C

When tested by the method described in IS 12235 (Part 9): 1986, read with annex C of IS 4985:2000 the pipe sample shall not fracture or crack through its complete wall thickness. Tests should be conducted for female adaptor pipe also

Size of Pipe Total mass
of Striker (In kg)
Height of
Free Fall (In mm)
Number of Equidistant Lines to be drawn
1” (33 mm OD) 0.25 ± 0.5% 1500 ± 10 -
1¼”(42 mm OD) 0.25 ± 0.5% 1500 ± 10 -
1½”(48 mm OD) 0.25 ± 0.5% 1500 ± 10 3
2” (60 mm OD ) 0.25 ± 0.5% 2000 ± 10 3
2½”(75mm OD) 0.50 ± 0.5% 2000 ± 10 4
3” (88 mm OD) 0.50 ± 0.5% 2000 ± 10 4
4” (113 mm OD) 0.50 ± 0.5% 2000 ± 10 6

Elastic Modulus and Tensile Strength

Elastic modulus and tensile strength at break shall be as given below when determined in accordance with the test procedure laid down in IS 8543 (Part 4 / Sec 1): 1984

  • Elastic Modulus 2800 ± 200 MPa
  • Tensile Strength Not less than 45 MPa

Note: The specimen for the test shall be prepared from a section of the pipe heated to a temperature of 125º C to 130º C and subsequently flattened and machined.

Vicat softening temperature

The vicat softening temperature shall not be less than 80º C when measured in accordance with the procedure given in IS 6307: 1985.

Note: The test may be done on specimen cut from the pipe, of dimensions as specified in IS 6307:1985. The specimen shall be supported on a suitable concave surface of radius equal to that of the sample pipe ensuring support on all ends.

Effect on Water

The pipe shall not have any detrimental effect on the composition of water flowing through them. The pipes shall meet the requirements/test specified in 10.3 of IS 4985: 2000.

Sulphated Ash Content Test

When tested as per Annex B of IS 4985:2000, the Sulphated ash content in the pipe shall not exceed 10 percent.

Internal Hydrostatic Pressure Test

When subject to internal hydrostatic pressure test in accordance with the procedure given in IS 12235 (Part 8)-1986, the pipes shall not burst during the prescribed test duration.

Joint Leak Proof Test

When subject to internal hydrostatic pressure test in accordance with the procedure given in IS 12235 (Part 8)-1986, the pipes shall not leak at the threading joints during the prescribed test duration.

Requirements of pipes for internal hydrostatic pressure test and Joint leak proof test

Test Temperature (1) Test Duration
(Minimum Holding Time) (2)
Induced Strees (3)
º C hour MPa (kgf/cm²)
27 1 36 (360)

Flexural Strength (Flexural Stress)

When tested in accordance with the procedure given in IS 13360(Part 5 /Sec 7) :1995 the value should be a minimum of 60 MPa (or) 600 Kgf/Cm 2

Izod Impact Strength

When tested in accordance with the procedure given in ASTMD256 it should be a minimum of 10 kg-cm/cm².

Charpy Impact Strength

When tested in accordance with the procedure given in ASTMD256 it should be a minimum of 12 kg-cm/cm².

Flattening Test

When tested in accordance with the procedure given in IS 14787:2000 it should meet the requirements.

Extrusion Quality Test (ACETONE TEST)

The pipe shall not flake or disintegrate when tested in accordance with the test method ASTMD2152.