Describe the control system that regulates the pressure within the interior of the boiler (including the furnace volume) in a short paragraph. Include in your answer, the regulation of airflow into, and exhaust gases out, of the boiler interior.

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Boiler-402 150 psig Hi PA 305 F 60 psig 350 F 100 psig 403 PCV-402A 401 LOW TE Pi PA Hi 75 psig 404 403 404 Low 50 psig Superheated To
Ex-205 PE V-402D Stack Desuperheated v-402E P7 # per hour of steam AUTO required at full load. V-402C SP 50% Vent 50% LAL AUTO 4027
35% TR 350 F .02 PIC OP% 50% 450PF 402 402A 404 SP :120 psig LCV-401 402 SP 1 50% PV :120 psig PV : 50% LT LE OP% 25% .... 

 
 

AUTO Boiler-402 TE 305F 60 psig 350F 403 TE P PA Hi 75 psig 404 403 404 Low 50 psig Superheated V-402D Stack Desuperheated V-402E PE PT 150 psig Hi PCV-402A PA 401 Low 100 psig To Ex-205 # per hour of steam required at full load. V-402C SP 50% PV: 50% Vent LAL AUTO 402 35% TR 350F -.02 PIC OP % 50% 450F Ti LR 402 Pi 402A LCV-401 402 404 SP 120 psig 402 SP 50% PV 120 psig -.02 P PV 50% LT LE OP% 25% AUTO 400 OP% 50% Treated PR AUTO LIC SP 50% FIC water 402 PV: 50% 402 402A OP% 50% LIC LP SP-05 401 Steam PV -.05 OP% 100% LT LE Deaerator AUTO PIC LAL 402B 35% 401 LR 401 V-402A V-40 - PT PE on/off BA 402 FT FE Burner-402 TE 400 Fan-402A 600F TE 401 500F PCV-402B Ai 402 AA Hi Fan-402B FCV-402C 155 psig V-41 402 FCV-402B Low FIC 0-10% Oxygen Pi 402 402C SP 50% PV: 50% OP% 50% FIC 402B SP 150 GPM AUTO FE FT PV 150 GPM 60 psig Pi 401 FT FE OP% 25% V-402B P-402 CASC TK-402 Natural Gas Tank