Machine Drawing

138 Machine Drawing

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d:\N-Design\Des8-1.pm5 Seventh Print

6. Electrical resistance – 10^14 ohms cm

7. Modulus of elasticity – approximately 30,000 kg/cm^2

8. Vicat softening point – 81°C.

Dimensions of PVC pipes as per IS 4985-1981 are given in Table 8.1. It may be noted

that the pipe size indicates the outside diameter of the pipe. However, the sizes of the fittings

indicate the inside diameter. The dimensions of commonly used PVC pipe fittings are shown in

Fig. 8.14, for 25 mm pipe.

The description of the fittings and their technical data are given in Table 8.2.

Table 8.1 Dimensions of PVC pipes All dimensions in millimetres

Wall thickness for working pressures

Outside Tolerance Class 1 Class 2 Class 3 Class 4

diameter on outside 2.5 kgf/cm^2 4 kgf/cm^2 6 kgf/cm^2 10 kgf/cm^2

diameter Min. Max. Min. Max. Min. Max. Min. Max.

20 + 0.3 — — — — — — 1.1 1.5

25 + 0.3 — — — — — — 1.4 1.8

32 + 0.3 — — — — — — 1.8 2.2

40 + 0.3 — — — — 1.4 1.8 2.2 2.7

50 + 0.3 — — — — 1.7 2.1 2.8 3.3

63 + 0.3 — — 1.5 1.9 2.2 2.7 3.5 4.1

75 + 0.3 — — 1.8 2.2 2.6 3.1 4.2 4.9

90 + 0.3 1.3 1.7 2.1 2.6 3.1 3.7 5.0 5.7

110 + 0.4 1.6 2.0 2.5 3.0 3.7 4.3 6.1 7.0

140 + 0.5 2.0 2.4 3.1 3.8 4.8 5.5 7.7 8.7

160 + 0.5 2.3 2.8 3.7 4.3 5.4 6.2 8.8 9.9

180 + 0.6 2.6 3.1 4.2 4.9 6.1 7.0 9.9 11.1

200 + 0.6 2.9 3.4 4.6 5.3 6.8 7.7 11.0 12.3

225 + 0.7 3.3 3.9 5.2 6.0 7.6 8.6 12.4 13.9

250 + 0.8 3.6 4.2 5.7 6.5 8.5 9.6 13.8 15.4

280 + 0.9 4.1 4.8 6.4 7.3 9.5 10.7 15.4 17.2

315 + 1.0 4.6 5.3 7.2 8.2 10.7 12.0 17.3 19.3

Table 8.2 PVC pipe fittings—technical data (contd.)

Description size in mm Inch Applications

I.D equivalent

1. Coupler 20 0.50 These are used for joining two
   25 0.75 PVC pipes.
   32 1.00
   40 1.25
   50 1.50
   63 2.00


2. 90° Elbow 20 to 110 0.5 to 4.0 These are used for short turns of 90°.


3. 90° Bend 20 to 315 0.5 to 12.00 These are used where long turns of
   angle are required. They do not cause
   any losses due to friction.