16
Figure 7: Purpose of Tappings and Bosses
TABLE 3: PURPOSE OF TAPPINGS & BOSSES
Tapping
Location
Size, NPT Boss Location
Thread Size
UNC
Steam Boiler
Less Heater
With Heater
A ¼" - 18 Pressure Gauge
B ¼" - 18 Pressure Limit
C ¾" - 14
Probe LWCO - Std.
Plugged (Float LWCO)
D ½" - 14
Water Gauge Glass (Probe LWCO)
Water Gauge Glass, Pressuretrol &
LWCO (Float LWCO)
E 2" - 11½" Supply (Front & Rear Tappings)
F ¾" - 14 Safety Valve
G 1½" - 11½ Condensate Return
H 1¼" - 11½ Optional Front Return
J 1½" - 11½ Surface Blowoff (Plugged)
K 1" - 11½ Indirect Water Heater Supply
L ½" - 14 Indirect Water Heater Limit
M (4 pcs) 5/16" - 18
Jacket Front Panel, Burner Swing
Door Mounting Bracket
N (2 pcs)
3/8" - 16 Burner Swing Door
P (10 pcs) 5/16" - 18
Jacket Rear Panel, Smoke Box Collar,
Cleanout Covers
Q ¼" - 18 Smokebox Pressure Tapping
R ½"-14
L4006
Operating
Control
Plugged
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