Burnham MEGASTEAM MST288 User Manual
Page 16
16
Figure : 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
" - 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 ( 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