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5. Forinstailers choosing to usebothsupplytappings,Figure8A showsthe
correctwayto pipethis system.Figure8B showsthewrongwayto pipe
a header with tworisers.
, Headersmust be fitted with header offsetsor swingjoints, or be
equippedwith expansion joints, so that thermal expansionand
contraction of the header will nat damagethe boiler.Headers shall
netbe welded.
, System takeoffs fromthe header mustbe between the equalizer a nd
theriserto the headernearest t heequalizer. S ystem takeoffs m ust
neverbe between two risers.
6.System takeoffsfromtheheadermustneverbe bull-headed. Ifthesteam
maingoesin twodirections, theremustbe twotakeoffs fromtheheader,
onefor eachmain.
7.
All boilersin gravityreturnsystems mustbeequipped witha Hartford
Loopasshownin Figures8 and 8A.
8.
Whenpipingthevertical r isersfromtheboilerto theheader, t he bottom
of the headermustbe a minimum of 24 inchesabovethewater level
lineanthe rightsideofthe boiler(i.e.51 inchesabovethefloor).
9.
Steamriser(s)andheadershallbe 272"pipe size.
10. Equalizer l ine shailbe minimum 1 1/2"pipesize.
11. The boilerhasa 1V2"tappingin rearsecflanfarskimming.
_EA_{ MAINS
HART_ORO
CLOSE
N|PPLE
MAIN VENT
D_Y RETURN
M_[N
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