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Figure 2: Section Tappings
Table 1: Trim and Control Installation in Section Tappings
Tapping
Size
(NPT)
Steam Boiler with
Probe L.W.C.O.
Steam Boiler with
Float L.W.C.O.
Water Boiler
Water Boiler with
Tankless Heater
A 2 Supply Supply Supply Supply
B ½
Bush to ¼
Pressure Gauge
Plug Plug Plug
C ½ Gauge Glass
Nipple & ½ Union
Gauge, L.W.C.O. Street
Elbow, Syphon & Limit
Plug Lower Tapping Bush
to ¼ Upper Tapping
Press./Temp. Gauge
Plug Lower Tapping Bush to
¼ Upper Tapping
Press./Temp. Gauge
D 2 Return Return
Bush to 1½, 3" Npl, Elbow,
2" Npl, Circ. Flange,
Gasket, Circulator Return
Bush to 1½, 3" Npl, Elbow,
2" Npl, Circ. Flange,
Gasket, Circulator Return
E ¾
3" Nipple & Street Elbow
Safety Relief Valve
3" Nipple & Street Elbow
Safety Relief Valve
3" Nipple & Street Elbow
Safety Relief Valve
3" Nipple & Street Elbow
Safety Relief Valve
F 2
Bush to ¾ Drain Valve
and/or Optional Return
Bush to ¾ Drain Valve
and/or Optional Return
Bush to ¾ Drain Valve and/or
Optional Gravity Return
Bush to ¾ Drain Valve and/or
Optional Gravity Return
G 2
Optional Supply (IN3-6)
Required Supply (IN7-12
Optional Supply (IN3-6)
Required Supply (IN7-12
Plug (IN3-12)
Optional Gravity Supply
Plug (IN3-12)
Optional Gravity Supply
H ¾
Bush to ¼ &
Syphon Limit
Bush to ¼
Pressure Gauge
Well
Limit
Well
Limit
J ¾ Not Applicable Not Applicable Not Applicable Tankless Heater
K ¾ Low Water Cutoff Plug Plug Plug
L 1
Factory Plugged
Surface Blow-Off
Factory Plugged
Surface Blow-Off
Factory Plugged Factory Plugged
M 1¼
Factory Plugged
Alliance Return
Factory Plugged
Alliance Return
Factory Plugged Factory Plugged
N 1¼
Factory Plugged
Alliance Supply
Factory Plugged
Alliance Supply
Factory Plugged Factory Plugged
P ¾
Factory Plugged
Alliance Limit
Factory Plugged
Alliance Limit
Factory Plugged Factory Plugged