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piping
Figure 3 shows a typical piping installation of a Model B40
in a pipeline to a pressure vessel. Reference lines, on float
chamber, should be aligned to correspond with liquid level
in the vessel at which switch control is desired (refer to
dimensional drawing, if furnished).
Use pipe of sufficient strength to support the unit. If neces-
sary, provide a stand or hanger to help support its weight.
All piping should be straight and free of low spots or pock-
ets so that the lower liquid line will drain towards the vessel,
and the upper vapor line will drain towards the control.
Pipeline should be insulated, as shown, to minimize loss of
liquid temperature and further control of the heat in the area
of the switch housing. DO nOT insulate switch housing or
float chamber.
nOTE: Manufacturer recommends that when welding
chrome-moly steel piping, the procedures used conform to
AWS-D10.8-61.
system (typical)
inSTaLLaTiOn
Vent line
from chamber
1" schedule 80
beveled in-line
weld nipples
for attaching
control to
Rising level
Falling level
inlet line to chamber
MOUnTing
Before welding, adjust piping to bring control to a vertical
position. B40 level controls must be mounted within three
(3°) degrees of vertical. A three degree slant is noticeable
by eye, but installation should be checked using a spirit
level. Controls used on boiler applications should be mount-
ed as close to the boiler as possible. This will result in a
more responsive and accurate level change in the control.
Water in a long line will be cooler and more dense than the
boiler water, causing lower level indication in the control
than actual level in the boiler.
pressure equalizing line to pressure vessel
cable connexion to switch housing
Reference lines
for switch actuating levels
Liquid equalizing line to pressure vessel must be
vertical to within three degrees (3°)
Figure 3
Do not insulate
chamber, fins,
switch housing
3
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