. The Locomotive . introduction to a new scheme of attaching the returnpipes to heating boilers as announced in the title. This new methodof piping the returns is shown in fig. 2. It will be noted that no check-valves are used. The returning water from the heating system iscarried to a point at about the water level of the boiler although itactually enters the boiler at the usual location at the bottom. It would,of course, be possible to carry the water into the boiler directly atabout the water level, but this is not desirable with the average castiron heating boiler, for the reason that it m
. The Locomotive . introduction to a new scheme of attaching the returnpipes to heating boilers as announced in the title. This new methodof piping the returns is shown in fig. 2. It will be noted that no check-valves are used. The returning water from the heating system iscarried to a point at about the water level of the boiler although itactually enters the boiler at the usual location at the bottom. It would,of course, be possible to carry the water into the boiler directly atabout the water level, but this is not desirable with the average castiron heating boiler, for the reason that it may cause too great a tem-perature difference at this level in view of the fact that the returningwater can be quite cold. However, with the arrangement as shown, it becomes necessaryto install a steam equalizing pipe (marked c in fig. 2.) to the highestpart of the return pipe, and this equalizing pipe must be of ample size r_ THE LOCOMOTIVE, [July, 5top Valve, fF AMY. StopValve, IF ANY. 0PERATI>^1G WATER IlG. and with as few turns as possible in Drder to eliminate friction, butwith such a pipe installed as shown water cannot be backed out of theboiler below the normal water level and the baneful effect of theinstallation of check-valves is thus done away with. For the guidance of our readers, who desire to make this changein existing installations, we would state that the minimum size ofpipe for equalizing pipes C should be as follows:— THE LOCOMOTIVE. 73 Gratt .Art-a Size of Pipe 4 square feet or less - - i-^ 4 square feet to 15 sq. ft. - - 2-^^ ^15 square feet or more - - 4 These figures apply to equalizing pipes C only. The returnpipes and pipes B which are normally filled with water may be ofany size which modern practice prescribes as proper for feeding boilers. Also with a single boiler installation this method of attaching thereturn pipe can be used to^ advantage and the check-valve omitted,(see fig. 3.) It will be seen that even though there is no ch
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