Machine Drawing

128 Machine Drawing

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

8.2.1 Joints for Cast Iron Pipes

Cast iron pipes are produced with flanges, integral with the pipe ends. To ensure alignment

and seating, the flange faces are machined. Further, to make the joint air tight, a thin disc of

packing material, such as rubber or leather, is placed between the flanges and are joined by

means of a number of bolts and nuts (Fig. 8.3a).

If greater strength is required for high pressure duty, the thickness of the pipe may be

slightly increased near the flange (Fig. 8.3b). For larger diameter pipes, under high pressures,

the flanges are strengthened by means of cast ribs. (Fig. 8.3c).

(^2525)
3
f

130

f

220

(a)

4 BOLTS, M18

f 100

f 170

25

5

f

125

4 BOLTS, M18

f 100

f 190

(b)

2540 40

f

135

f

250

Fig. 8.3 Cast iron pipe joints (Contd.)