. Science of railways . ^22 LOCOMOTIVE APPLIANCES. THE DEAN BOILER TUBE CLEANER The Dean boiler tube cleaner is a pneumatic vibrator whichremoves scale from the inside or outside of tubes of boilers,condensers, or evaporators. It cleans from ten to thirty tubesan hour, and besides removing the scale from the water sideof the tube, it removes the caked soot from the fire side. It is operated by compressed air or steai)^ and works onthe principle of the ordinary steam engine. The illustration above shows* a sectional view of the Dean. Power passes through the nozzle A to the chamber as va
. Science of railways . ^22 LOCOMOTIVE APPLIANCES. THE DEAN BOILER TUBE CLEANER The Dean boiler tube cleaner is a pneumatic vibrator whichremoves scale from the inside or outside of tubes of boilers,condensers, or evaporators. It cleans from ten to thirty tubesan hour, and besides removing the scale from the water sideof the tube, it removes the caked soot from the fire side. It is operated by compressed air or steai)^ and works onthe principle of the ordinary steam engine. The illustration above shows* a sectional view of the Dean. Power passes through the nozzle A to the chamber as valve .04 is thrown back and forth the power isadmitted alternately through the ports C, C to each end of. Fig. 1SECTIONAL VIEW OF THE DEAN Vibrator Heads .11 and .10 Are Interchangeable, Making theCleaner Adaptable to Return Tubular or Water Tube Boilers the piston chamber D, acting on the piston .18 and givingthe vibrator .07 its vibratory motion. The vibrator taps the tube at the rate of from 3,500 to10,000 times per minute. The rapid movement of this vibra-tor sets up a series of vibrations in the boiler tube and it isthe localized tremor thus created that removes the scale; thescale is loosened from the tube surfaces. Where the scale is on the outside of the tube it falls inshowers to the bottom of the boiler; where it is on the inside,it is broken into small pieces and driven out by the exhaust. It is claimed that these vibrations are properly controlledand cause no damage, neither do they affect the solidity,strength, or durability of the tube, or the header to which itis attached. LOCOMOTIVE APPLIANCES. 323 Boiler tubes are cold-drawn steel shells, and when fas-tened into the heade
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