Table 1-2.—Boiler Accessories, Its Location, and Function

Table 1-2.—Boiler Accessories, Its Location, and Function ITEM ACCESSORY LOCATION PURPOSE 1 2 3 4 5 6 7 8 9 Boiler Boiler room Generate steam or hot water in a closed vessel Main steam stop On the steam outlet of a boiler Place the boiler on line or off line Guard valve On the steam outlet of a boiler Guard or backup to the main steam- directly following the main steam- stop valve stop valve Daylight (drain) valve Between the main steam-stop valve Open only when the main steam and and the guard valve guard valves are closed. Indicates if one of the valves is leaking through Main steam line The line that conveys steam from a Carry steam from the boiler to the boiler to all branch or distribution branches or distribution lines lines. When a system is supplied by a bank of boilers connected into the same header, the line(s) conveying steam for the boiler(s) to the header Root valve Installed in branch or distribution Isolate a branch or distribution line lines just off of the main steam line (serves as an emergency shutoff) Pressure regulating valve Installed as close as practical (after a Equipment that requires lower (PRV) reducing station) to the equipment or pressure than main steam line area it serves pressure (coppers, dishwashers, steam chest, turbines, etc.) Steam trap Installed on the discharge side of all Automatically drains condensate s t e a m h e a t i n g o r c o o k i n g and prevents the passage of steam equipment, dead ends, low points, or through equipment at regular intervals throughout a steam system (automatic drip legs) Drip legs Provided throughout a system where Remove condensate from a system condensation is most likely to occur, manually such as low spots, bottom of risers, and dead ends 1-15