THE FEED WATER 2/ 



in the feed pipe should be examined, for which purpose the 

 valve, between it and the boiler, can be closed. If nothing 

 be found, the stem should be removed from the valve or the 

 plug removed from the tee so as to expose the opening 

 through the pipe nipple which enters the boiler ; probably 

 this pipe will be found nearly filled with lime at the point 

 at which it enters the boiler as shown in Fig. 3, on page 16. 

 This may be cleaned by driving a bolt into it. Of course, 

 the angle valve stem or plug can only be removed when the 

 boiler is cold. 



Packing the Pump. The successful operation of this 

 pump depends very much upon the manner in which the 

 water piston and other parts are packed. In renewing the 

 piston packing, do not compress it too much. See that it 

 is of sufficient thickness to a little more than fill the space 

 between the inner and outer follower heads. This will 

 allow the packing to be compressed slightly before the fol- 

 lower heads are forced together. On the other hand, if 

 the space between the follower heads be not completely 

 filled, leakage will result. When properly packed, the pis- 

 ton may be readily moved by hand. The nut on the end 

 of the piston rod should be tightened to bring the follower 

 to place. The packing between the steam chest and the 

 cylinder should be made of heavy manilla paper or light 

 rubber, and must be patterned from the planed surface top 

 of the steam cylinder (not the lower part of the chest), 

 and all holes must be carefully duplicated, so that the drilled 



