Loading ...
Loading ...
Loading ...
5. For installers choosing to use both supply tappings, Figure
6A shows the correct way to pipe this system. Figure
6B shows the wrong way to pipe a header with two risers.
• Headers must be fitted with header offsets or swing joints,
or be equipped with expansion joints, so that thermal
expansion and contraction of the header will not damage
the boiler. Headers shall not be welded.
• System takeoffs from the header must be between the
equalizer and the riser to the header nearest the
equalizer. System takeoffs must never be between two
risers.
6. System takeoffs from the header must never be bul-
lheaded. If the steam main goes in two directions, there
must be two takeoffs from the header, one for each main.
7. All boilers in gravity return systems must be equipped
with a Hartford Loop as shown in Figures 5 and 6A.
8. When piping the vertical risers from the boiler to the
header, the bottom of the header must be a minimum
of 24 inches above the water level line on the right side
of the boiler.
9. Steam riser(s) and header shall be 2V2"pipe size.
10. Equalizer line shall be minimum iV2" pipe size.
11. The near boiler piping shall include a 21/2, tee with a
plug located on the supply line as shown for skimming
{i.e. surface blowdown).
PIPEFULLSIZESAN_E
AS BOILERTAPPING
(2 1/2"
POP SAFETYVALVE
CONNECTRISERTO BOILERWITH
2 I/2"ELBOWAND NIPPLE
(NOTSHOWN)
FLUE
COLLAR
MIN
2 1/2" TEEWITH
PLUGFOR
@ 24"
W_AfERFEED
STEAM MAINS
ELLPOINTING
DOWN
1 1/2" MIN.
PIPESIZE
NIPPLE
6" TO 10"
MAINVENT
DRY RETURN
MAIN
1S"MIN.
28" MIN DIMENSIONA
HARTFORD LOOP
RETURN
-GATEVALVE(NOTFURNISHED)
_ORAIN VALVE(FURNISHED)
FOR FLUSHINGSYSTEM
I I/2"FULLPORT BALLVALVE
FOR BOTFOMBLOW DOWN
AND DRAININGBOILER
& SYSTEM(NOTFURNISHED)
Loading ...
Loading ...
Loading ...