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American Society of Heating and Ventilating Engineers Guide, 1934 aagECT QAOATQgj ^ Keens iOivc Thermostatic trap Fig. 22. Typical Piping Connections tojIndirect Radiators with Dry Return Note.--Suitable for atmospheric, vapor, vacuum, sub-atmospheric, and orifice systems. m **TEVALVE' Full size of tapping - To return line beyond blast traps To blast trap Reducing eii Check vatve Fig. 25. Heating Unit Return Con nection with Separate Air Line Chapter 32--Steam System Piping Solution. For the C row, ,, 50,000 X (40 - 0) 220.8 9058 sq ft. For the B row, R = 50,000 X (65 - 40) 220.8 = .5661 sq ft. For the A row, 50,000 X (80 - 65) K~ 220.8 = 3397 sq ft. TYPKAL CONNECTIONS TO UWffOUD COILS HWIWa MOQE THAN 6 PPES. Fig. 23. Typical Pipe Coil Connections Note.--Suitable for up-feed or down-feed. For atmospheric, vapor, vacuum, sub-atmospheric, and orifice systems. 8tASI MEATEta, M' SUPRY AND RETURN CONNECTIONS TO LAST COtLS TOR VACUUM SYSTEM USING LAST TRAP ON EACH TIER. . Fig. 24. Connections for Heating Units of Central Fan Systems /JNote.--Suitable for atmospheric and vacuum' systems. Fig. 26. Typical Connections to Central Fan System Heating Units Exceeding 12 Sections Note.--Suitable for vacuum and atmospheric systems. 466 Fig. 27. Typical Piping for Atmospheric and Vacuum Systems with Thermostatic Control (Central Fan System) Each row of heating units consists of four stacks and each stack has two connections so that the load on each stack and each connection of the stack is as follows: Row c B A Total Load (EDR) 9058 5661 3397 Stack Load* (EDR) 2265 1415 849 Connection LoADb (EDR) 2265 or 1132 ,, 1415 or 708 849 or 425 of total row load. of stack load if two steam connections are made; otherwise, same as stack load. 467 J