|
| 820 04 | AFTER-COOLERS AND CONDENSERS |
| 820 05 | AIR DRYERS, DEHYDRATORS, AND PREHEATERS |
| 820 06 | A.S.M.E. CODE TANKS |
| 820 08 | BOILERS, HIGH PRESSURE |
| 820 12 | BOILERS, LOW PRESSURE |
| 820 14 | BOILER PARTS AND ACCESSORIES (NOT OTHERWISE CLASSIFIED) |
| 820 16 | BOILER TUBES |
| 820 19 | BLOW-DOWN EQUIPMENT, AUTOMATIC TOP |
| 820 20 | BLOW-OFF BASINS |
| 820 24 | BLOW-OFF VALVES |
| 820 28 | BURNERS, GAS AND OIL |
| 820 32 | CHEMICAL FEED SYSTEMS (SEE CLASS 720 FOR PROPORTIONING PUMPS) |
| 820 36 | COILS, STEAM HEATING |
| 820 38 | CONDENSATE RETURN SYSTEMS: VACUUM HEAT PUMPS, WET VACUUM PUMPS, ETC. |
| 820 40 | CONTROLS: COMBUSTION, FUEL CUT-OFF, HARDNESS, HIGH-LOW WATER LEVEL, IGNITION, ETC. |
| 820 41 | CONTROL, CORROSION, USING ENTRAINED GAS ELIMINATOR EQUIPMENT |
| 820 42 | CONTROLLERS, STEAM BOILER AUTOMATIC CONDUCTIVITY |
| 820 44 | CONVECTORS AND RADIATORS |
| 820 48 | DEAERATING UNITS |
| 820 49 | DESCALING EQUIPMENT, MHD TYPE |
| 820 52 | DRAFT FANS AND DRAFT GAUGES |
| 820 56 | FEEDWATER HEATERS |
| 820 60 | FEEDWATER INJECTORS |
| 820 62 | FEEDWATER PUMPS |
| 820 64 | FILTERS, BOILER WATER |
| 820 65 | FLUE GAS DESULFURIZATION SYSTEM EQUIPMENT |
| 820 66 | FLUE GAS HEAT RECOVERY SYSTEM EQUIPMENT |
| 820 68 | HEAT EXCHANGERS, ACCESSORIES, AND PARTS |
| 820 72 | HOT WATER GENERATORS |
| 820 75 | OIL COOLERS |
| 820 76 | OIL PURIFIERS |
| 820 78 | OXYGEN REDUCTION EQUIPMENT, DISSOLVED |
| 820 80 | PULVERIZERS, BOILER AND POWER PLANT |
| 820 81 | SCREENS AND STRAINERS, WATER INTAKE, ETC. |
| 820 84 | STACKS, STEEL |
| 820 85 | STEAM BOILER BOTTOM BLOW ALARM |
| 820 86 | STEAM FLOW TRANSMITTERS |
| 820 88 | TUBE CLEANERS AND TUBE EXPANDERS |
| 820 91 | TURBINES, GAS DRIVEN |
| 820 92 | TURBINES, STEAM DRIVEN |
| 820 93 | TURBINES, WATER, HYDRAULIC, INCLUDING PATS AND ACCESSORIES |
| 820 95 | VALVES, SPHERICAL |
| 820 96 | RECYCLED STEAM AND HOT WATER BOILERS AND HEATING EQUIPMENT |