5. Forinstallers choosing to use both supply tappings, Figure
6A shows the correct way to pipe this system. Figure
6B showsthe wrong way to pipe a header with two risers.
• Headers must be fitted with header offsets orswing joints,
or be equipped with expansion joints, so that thermal
expansion and contraction of the header wilt 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.
,
8.
All boilers in gravity return systems must be equipped
with a Hartford Loop as shown in Figures 5 and 6A.
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
ofthe boiler.
9. Steam riser(s) and header shall be 21/2"pipe size.
!0. Equalizer line shall be minimum 11/2"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).
PiPE FULLSIZE SAME
AS BOILERTAPPING
(2
POP SAFE_ VALVE
CONNECTRISERTO BOILERWITH
2 I/2" ELBOWANDNIPPLE
(NOTSHOWN)
FLUE
COLLAR
MIN,
....{"2112" W TN
PLUGFORS
24"
W_AT_RFEED
STEAMMAINS
REDUCINGELL POINTING
DOWN
6" TO t0"
I1/2" MIN.
PiPE StZE
15" MIN,
28" MIN - DIMENSION A
I
i
NIPPLE
HARTFORDLOOP
RETURN
-GATEVALVE(NOTFURNISHED)
_-- DRAINVALVE(FURNISHED)
FOR FLUSHINGSYSTEM
I ;/2" FULLPORTBALLVALVE
FORBOTTOMBLOWDOWN
ANDDRAINING BOILER
& SYSTEM(NOT FURNISHED)
MAINVENT
ORYRETURN
MAiN
_4106A 6
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