Heating and ventilating buildings : a manual for heating engineers and architects . good, non-conducting material, for which magnesia and asbestosmay be recommended, put on while in a plastic condition to thedepth of 2 inches. Mineral wool is also used for this purpose. SETTINGS AND APPLIANCES. 177 Brickwork is often used; bul it is heavier, and quite liable lo crack from the effects of heat. 86. Setting of Heating-boilers. — If heating-boilers are tobe set in brickwork, the special directions which have alreadybeen given can be applied, with such modifications as may beneeded for the boiler i
Heating and ventilating buildings : a manual for heating engineers and architects . good, non-conducting material, for which magnesia and asbestosmay be recommended, put on while in a plastic condition to thedepth of 2 inches. Mineral wool is also used for this purpose. SETTINGS AND APPLIANCES. 177 Brickwork is often used; bul it is heavier, and quite liable lo crack from the effects of heat. 86. Setting of Heating-boilers. — If heating-boilers are tobe set in brickwork, the special directions which have alreadybeen given can be applied, with such modifications as may beneeded for the boiler in ques-tion. Nearly all heating-boilersare now set in what is called aportable setting, in which nobrick whatever is used. Someof the heaters are constructed insuch a manner that no outsidecasing is required, as in Fig. 138;others require thin casing ofgalvanized or black iron whichis lined with some non-conduct-ing material, as magnesia, as-. Fig. Magazine Boiler. bestos fibre, or reck wool, which is is placed outside the heaterand arranged so as to enclose a dead-air space, as in Fig. coverings are nearly as efficient in preventing the lossof heat as brickwork, and they form a more cleanly and neaterappearing job. The slight amount of heat which escapes from such asetting is seldom more than that required to warm up thebasement or room in which the heater is located. The boiler must in all cases be provided with a steam-gauge, savety-valve, and damper regulator, all of which arespecially described later. The steam-gauge should be eitherconnected below the water-level or else provided with a siphonto prevent dry steam entering the interior tube. A safety-valve of the single-weighted type is preferable and shouldbe connected at the top of the heater. The damper regu-lator usually consists of a rubber diaphragm which is actedon by pressure so as to open and close the dampers as will prove
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