Mechanical Contracting & Plumbing January-December 1909 . oes the water in an oldstyle large pipe system, and the circula-tion is comparatively sluggish, causingthe plant to be inactive. Where pres-sure is produced by a regulating valvethe risk run by the operator of the sys-tem is great. The writer has in mind atthe present time one job which was in-stalled by a valve, and after some monthsthe valve stuck, and, upon the water rising to a boiling point, the valve refusedto operate. The result was an explos-ion, which blew out the entire side of theroom, and carried the expansion tanksome dista
Mechanical Contracting & Plumbing January-December 1909 . oes the water in an oldstyle large pipe system, and the circula-tion is comparatively sluggish, causingthe plant to be inactive. Where pres-sure is produced by a regulating valvethe risk run by the operator of the sys-tem is great. The writer has in mind atthe present time one job which was in-stalled by a valve, and after some monthsthe valve stuck, and, upon the water rising to a boiling point, the valve refusedto operate. The result was an explos-ion, which blew out the entire side of theroom, and carried the expansion tanksome distance. With a mercury regu-lator, of which there are several pat-ents on the market, there is practicallyno danger when creating a pressure uponthe system, as these regulators are con-structed with a standpipe extending froma bulb-shaped casting on the bottom to asimilar-shaped easting on the top, and isconstructed with brass tubes in thisstandpipe, so that the expansion of waterfrom the system will cause a column ofmercury to rise in the standpipe of the. Plan of Upstairs. device to 21 inches, which automaticallyand positively seals the system from theatmosphere, as there are 5] pounds ofmercury in this regulator, and mercurybeing twice as heavy as water, there is a PLUMBER AND STEAM FITTER July l, 1909. pressure of eleven pounds generated inan absolutely safe manner. As the expanding rises, the mercury againsta bottle plate in the top casting whenan excessive pressure is created, the boil-ing water then passes around this plateand expands through the expansive linetaken from the top of the same to THREE-INCH SOIL PIPE. Editor Plumber and Steamfitter ofCanada,—I notice the article in your is-sue of June 15 on Three inch soil pipein dwelling houses, by Charles M. Mc-Hugh, relative to the proper size forsoil pipe for an ordinary dwelling, andfully concur in his statement to the ef-fect that were all men of the same mindthe plumbing trade would indeed be slowin advance
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