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5.Forinstailerschoosingto usebothsupplytappings,Figure8Ashowsthe
correctwayto pipethissystem.Figure8Bshowsthewrongwaytopipe
a headerwithtworisers.
, Headersmustbe fittedwith headeroffsetsor swingjoints,or be
equippedwith expansionjoints, so that thermalexpansionand
contractionofthe headerwillnatdamagetheboiler.Headersshall
netbewelded.
, Systemtakeoffsfromtheheadermustbebetweentheequalizerand
therisertotheheadernearesttheequalizer.Systemtakeoffsmust
neverbe betweentworisers.
6.Systemtakeoffsfromtheheadermustneverbe bull-headed.Ifthesteam
maingoesintwodirections,theremustbetwotakeoffsfromtheheader,
oneforeachmain.
7. All boilersingravityreturnsystemsmustbeequippedwitha Hartford
LoopasshowninFigures8 and8A.
8. Whenpipingtheverticalrisersfromtheboilertotheheader,thebottom
oftheheadermustbea minimumof 24inchesabovethewaterlevel
lineantherightsideoftheboiler(i.e.51inchesabovethefloor).
9. Steamriser(s)andheadershallbe272"pipesize.
10. Equalizerlineshailbeminimum1 1/2"pipesize.
11. Theboilerhasa 1V2"tappinginrearsecflanfarskimming.
_EA_{ MAINS
HART_ORO
CLOSE
N|PPLE
MAIN VENT
D_Y RETURN
M_[N
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