From table 3 besides dimensions and three edge load

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Unformatted text preview: for Pipes for Drainage, Sewerage and Culverts (Clause 13.4 ) mm (1) 200 250 300 350 400 450 500 600 700 800 900 1000 1 100 1200 Np2 Class Np3 Class Np4 Class Load to Produce 0.25mm Nominal Internal Dia of Pipe Load to Produce Maximum 0.25 mm Crack kNlm (2) Crack kN/m (3) 11.77 12.55 13.48 14.46 I5.45 16.18 17.16 18.88 20.35 21.57 22.80 24.27 25.50 26.97 14.50 15.00 15.50 16.77 19.16 21.56 23.95 28.74 33.53 38.32 43.11 47.90 52.69 57.48 I Load to Produce Maximum 0.25 mm Crack kN/m (4) 24.60 25.50 26.40 29.80 33.90 36.90 40.00 46.30 52.20 59.30 66.30 72.60 80.40 88.30 Nominal Internal Dia of Pipe mm (1) 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 Np7 Class –- Np3 Class Np4 Class Load to Produce Maximum 0.25 mm Crack kN/m (2) Load to Produce Maximum 0.25 mm Crack kN/m (3) Load to Produce Maximum 0.25 mm Crack 28.20 29.42 30.77 32.12 33.59 35.06 36.41 37.76 38.99 40.21 62.30 67.06 71.85 76.64 81.40 86.22 91.00 95.80 100.60 105.38 110.00 114.96 I 19.70 96.20 — — — kN/m (4) 104.20 111.90 119.60 127.40 135.30 135.30 135.30 138.70 142.20 148.60 155.00 160.80 NOTE — Pipes with other three-edge bearing test requirements maybe supplied by agreement between purchaser and manufacturer. 8 IS 784:2001 Table 3 Scale of Sampling and Number of Acceptable Defective Tests (Clause 14.1) Number of Pipes in Lot Socket and Hydrostatic Permeability Spigot Test ** . ** * (1) (2) (3) (4) All All All All All Nil Nil Nil Nil Nil All AH All All AH \ (5) 20-50 Nil Nil Nil Nil Nil 30 I-500 501-1000 Dimensional Test Dimension * 51-100 101-300 Coating Thickness r * ** * q (6) 3 5 8 13 26 (7) Nil Nil Nil Nil 1 (8) 3 5 8 13 26 (9) Nil Nil Nil Nil 1 * (lo) 3 5 8 13 26 Three Edge Bearfng Test Drainage, Sewerage, Culvert Pipes q q > ** (11) Nil Nil Nil Nil 1 (12) (13) 2 Nil 2 Nil 3 Nil , 4 Nil 5 Nil * Number of samples. ** Number of defective accemabie. 15.1.2 Core Thickness 14.3 After the lot is accepted, each pipe shall be tnarked with a colour band at ends. Different colours to be used for different pressure heads. Measurement of outer circumference of core shall be made at three barrel positions and average outer diameter of core shall be calculated. The inside diameter shall be measured at three barrel positions and average is calculated. The core thickness shall be calculated as follows: 15 PROCEDURE FOR INSPECTION 15.1 Dimensional Checks 15.1.1 Internal Diameter Average outside diameter – Average inside diameter The internal diameter shall be measured at each end of the pipe at approximately 50 mm from the ends and at centre. Two measurements of the internal diameter at 90° to each other shall be made at each end and at the centre. 2 15.1.3 Socket and Spigot Diameters 15.1.3.1 Socket diameter ~ointing surjace) To accomplish this, ‘Go’ and ‘No Go’ gauges of a stiff rod with hardened rounded ends shall be used. The length of gauges and colour shall be given below: The socket diameter shall be checked by measuring the sway by touching...
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