. A manual of marine engineering: comprising the design, construction, and working of marine machinery. Figs. 67-72.—Condenser Tube Packings. they are squeezed through a die in a press until they can be easily driven intotheir holes ; soon after being fitted into place they absorb moisture and expandcircumferentially at each end, and become exceedingly tight on the tube and 234 MANUAL OF MARINE ENGINEERING. in the hole. After twelve years service they are found quite sound. It isurged against them that they are apt to shrink and drop out when the con-denser is not in use, but this is not the c
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. Figs. 67-72.—Condenser Tube Packings. they are squeezed through a die in a press until they can be easily driven intotheir holes ; soon after being fitted into place they absorb moisture and expandcircumferentially at each end, and become exceedingly tight on the tube and 234 MANUAL OF MARINE ENGINEERING. in the hole. After twelve years service they are found quite sound. It isurged against them that they are apt to shrink and drop out when the con-denser is not in use, but this is not the case, as the swelled projecting endsform collars to prevent this, and they do not shrink so much as is generallysupposed, unless by unusual heat. This is one of the cheapest forms of tube-packing, and although not used now in Navy is often employed in themercantile marine of this and other countries, and does very well when thetubes are not very long; these ferrules also specially suited the cast-irontube-plate very well. At present they are seldom used in new engines. The next simple method
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