Document 3Q058ko4aYjyn8j0GDY4ZVORa

600 CHAPTER 23 s :: ' 1949 Guide Steam'Heating Systems and Piping 501 Fio. 48. Typical Connections to Finned Pipe Convectob low pressure or vacuum return. A typical arrangement of a flash leg with sizes required for varying capacities is given in Fig. 43. CONNECTIONS TO HEATING UNITS Riser, radiator and convector connections must not only be properly pitched at the time they are installed, but must be arranged so that the pitch will be maintained under the strains of expansion and contraction. These connections may be made by swing joints which permit the ex pansion or contraction to occur under heating and cooling without bending of pipes. To take care of expansion in long risers,'either expansion1 joints of commercial construction or pipe, swing joints are used. Anchoring of pipes between expansion joints is desirable. Two satisfactory methods'of making runouts for, one-pipe systems for either the up-feed.or the down-feed type are, shown' in Fig. 44. Where the vertical distance is limited and the runouts must run above the floor,1 the radiator may be set on pedestals or raised by means of. high legs.. Two. methods of connecting a unit heater to a one-pipe steam heating system are'illustrated in Fig. 2 (and also in Fig. 5 of Chapter 26). Fio. 61. Ttpical Connections to Finned Tdbb Blast Heating Coils op the Steam Distributing or Non-Freeze Type Typical two-pipe radiator connections; are'shown ifi;;Fig.'45 and" 46. While- theseshow: top inlet supply 'connections which' are; preferred,' it is: also possible to connect the supply to the bottom of the radiator.- Short radiators may be connected with top supply, and bottom return on the same end. A typical; methodx)f''connecting convectors is shown in.Fig!. 47. Some times the supply valve is omitted on convector connections and a damper' is supplied in the: outlet grille for heat control. A typical'connection for finned, pipe convectors is shown in Fig. . 48. Typical connections to blast heaters are'shown ini'Fig. 49, 50,and'51. Figure 52 sEows a typical return and connection for blast heaters connected to high pressure `systems: ' . '" A' typical two-pipe connection to a unit heater is indicated in Figure CONTROL VALVES Gate valves are recommended in all cases where service demands that the valve be-either entirely open or entirely closed, but they should never Fig. 52. Typical Retudn Connections to Finned Tube Blast Heaters with High Pressure tea*i