566 MODERN STEAM PRACTICE . steam pipes in the smoke box are made of a bent form , it is not necessary to provide any expansion joints ; they are simply bolted to a cast - iron branch fitted to the end of the tube plate , while at the bottom end they are bolted to flanges cast on the cylinder… … Fig . 419 . — Blast - pipe Orifice . Fig . 418 . — Blast Pipe . , Blast pipe . b , Flange . c , Hole bored out . , Blast pipe . b , Copper nozzle . accurately bored out , so that there is a true and smooth surface for the exit of the steam . It is of the utmost importance that the blast orifice…
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