. Puissance, chauffage et ventilation ... un traité pour la conception et la construction d'ingénieurs, architectes et étudiants. e raccordement de pipe 10 à 24 1 81 à 00 IJ 60 à 80 IJ 80 à 130 2 Tableau XXXI.Dimensions des retours. Diamètre du diamètre du tuyau de vapeur. Retour à sec, Retour scellé. Pouces pouces pouces pouces 1 1 i 11 1 U n 1 2 u U 2J 2 IJ 3 25 2 35 2J 8 4 3 25 5 3 25 6 35 3 7 35 3 8 4 35 9 5 34 10 B 4 12 6 B. fixé directement sur le tuyau. Ce n'est pas souhaitable que l'ex-pansion et la contraction de la pipe les pousse bientôt hors du plafond, produisant ainsi une apparence disgracieuse. VAPEUR DIRECTE

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. Power, heating and ventilation ... a treatise for designing and constructing engineers, architects and students. e pipe connection10 to 24 1 81 to 00 IJ 60 to 80 IJ 80 to 130 2 Table XXXI.Sizes of Returns. Diameter of Diameter of Diameter of steam pipe. dry return, sealed return. inches inches inches 1 1 i 11 1 1 U n 1 2 u U 2J 2 IJ 3 25 2 35 2J 8 4 3 25 5 3 25 6 35 3 7 35 3 8 4 35 9 5 34 10 B 4 12 6 B fastened directly to the pipe. These are not desirable as the ex-pansion and contraction of the pipe soon pushes them away fromthe ceiling, thus producing an unsightly appearance. DIRECT STEAM HEATING 103 Boiler Equipment. Boilers.—The best type of boiler will depend upon the kind ofbuilding to be heated, and also to a considerable extent upon itssize. For dwelling houses, and school buildings and churches ofsmall size, some form of cast-iron boiler is usually employed. These are commonly rated according to the direct radiatingsurface which they will supply. Catalogue ratings, however, should not in general be used, and it is better to compute thenecessary grate surface as described in Chapter V.. Fig. 68. Adjustable Floor Sleeve for Protection of Woodwork. If catalogues are to be relied upon, only about 75 per cent ofthe rating should be taken, and this should include steam mainsand risers as heating surface unless they are thoroughly insulated. For larger building, tubular boilers are generally employed.The method of computing the size of these boilers for heatingpurposes has already been given in Chapter V. Boiler Connections.—The connections for cast-iron heatingboilers are simple. If a single boiler is used, valves should beplaced in both the supply and return mains, and a check valveshould also be provided in the latter outside of the gate valve.As low pressures are carried, the boiler may be fed under citypressure, through one of the return headers. Both stop andcheck valves should be placed in the feed pipe. Connections pro- 104 HEATING AND VENTILATING PL

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