the fire - box end , the tubes , being greatly heated , contract , and draw out of the holes in the tube plate , causing leakage ; and , moreover , when cold water is injected into that part of a boiler where the steam is more readily produced , it must have a tendency to reduce the temperature of… … Figs . 525 , 526 . — Feed Pumps . a a , Pump barreis , b b , Plungers . C c , Suction valves . d d , Delivery valves . e e , Non - return valves . and contraction of the boiler , which can be easily done by giving the pipe a round bold radius where it bends up from the pump to the non - return…
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