Document 6BbX8wq79L6rQebx95Y7Qpp7R

544 CHAPTER 20 plan: 1957 Guide Steam Heating Systems Alfl OUTLET GRILLE L- CONVECTOR ENCLOSURE 545 ' THERMOSTATIC TRAP Fig. 47. Typical Convector Connections Fig. 48. Typical Connections to Finned Pipe Convector Fig. 44. One-Pipe Radiator Connections The dripping of high pressure mains, or of equipment using high pressure steam into low pressure or vacuum returns, is generally accomplished by the use of a flash tank or flash leg into which the high pressure trap is arranged to discharge. This tank provides the required space for the flashing from high temperature condensate to low pressure steam to take place. The low pressure steam therein generated is passed directly to the low pressure steam mains, and the condensate is discharged through a second trap to the low pressure or vacuum return. Atypical arrangement of a flash leg, with sizes required for varying capacities, is given in Fig. 43. CONNECTIONS TO HEATING UNITS Biser, 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 expansion joints of commercial construction or pipe swing joints are used. Anchoring of pipes between expansion joints is desirable. Fig. 49. Tube BfTolyrapsSitceHarleieaCstoiFnnngloeCcwotiioolsfnsAArtiroraFnignendedAFrFirniagnn.egd6e0dT. ufTobyrepiPBcaalralasCltloeHnlenaFetclitoniwognosCfotiAolslr -Direction of air plow ' THERMOSTAT ,, REGULATING VALVE . .STRAINER i GATE VAU/E Fig. 45. Two-Pipe Top and Bottom Opposite End Radiator Connections Fig. 46. Two-Pipe Connections to Radiator Hung on Wall T ^ RETURN MAI Pig. 51. Typical Connections Finned Tube Blast Heating Coi op the Steam Distributing or Non-Freeze Type Fig. 52. Typical Return Connections to Finned Tube Blast Heaters with High Pressure Steam