Roper's catechism for steam engineers and electricians .. (1899)
Roper, Stephen. [from old catalog], Keller, Edwin R., [from old catalog] ed, Pike, Clayton W., [from old catalog] ed · Philadelphia, D. McKay · leaf 195
manner inwhich a by-pass is usually constructed. A. As generally constructed a by-pass consists 174 ROPERS CATECHISM FOR of a pipe leading around the appliance and fittedwith three valves—V, V„ and V,„—as shown inthe accompanying cut, the trap (in this case)being connected to the piping by pipe… … sary to close the valves V, and V„ and to openy,,,. The steam, instead of passing through thetrap, will then pass around it through the by-pass,and the trap or other appliance may be discon-nected by means of the two unions U, U, withoutin any way interfering with the operation of theplant. For…
Steam engineering · Electrical engineering
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