Emerson Penberthy Installation, Operation And Maintenance Instructions page 7

PENBERTHY SIGHT FLOW INDICATORS
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Safety instructions
Bumping or sliding of glass against each other
or against other surfaces may result in glass
breaking, scratching, or chipping� Glass that is
broken is dangerous and useless and should
be disposed of in a safe manner determined by
the user� Glass that is chipped or scratched is
weakened and should not be used under any
circumstances� Pressure/temperature ratings
within Table 1 and 2 are no longer valid for
glass that is weakened�
d� Place the sight flow indicator in a horizontal
position�
e� Install glass gasket (7) and housing gasket
(7B) on gasket surfaces of body�
f� Place band (331) around glass (48) and
center glass on gasket�
g� Place gasket (7A) centered on glass�
h� Prior to assembling housing over glass,
some measurements must be taken to
determine if any shim gaskets are required
to be installed between glass gasket and
housing in order to insure a proper seal of
the housing to the body� See Figure 3�
1� Measure the distance from the top
surface of the housing gasket to the top
surface of the glass gasket, Dim "A"�
2� Measure the counter bore depth of
the housing, Dim� "B"� If Dim� "B" is
greater than Dim "A", subtract Dim "A"
from Dim� "B"� The difference of these
measurements will determine what total
thickness of shim gaskets will need to
be installed between the top of the glass
gasket and the housing�
Note: if Dim "A" and Dim� "B" measure the
same, no shim gaskets will be required�
3� Install proper thickness of shim
gaskets, if required, on top of glass
gasket making sure that all gaskets are
centered on glass�
i� Assemble housing (181) over glass, making
sure that all components stay centered�
j� Place gasket centered inside housing�
k� Place band around glass and center on
gasket�
l� Place cushion (8) on glass and housing
gasket on housing�
m� Prior to assembly of cover over glass, more
measurements must be taken to determine
if any shim gaskets are required to be
installed between cushion and cover to
insure a proper seal of the housing to the
cover� See Figure 3�
1� Measure the distances from the top
surface of the housing gasket to the top
surface of the glass cushion, Dim "C"�
2� Measure the counter bore depth of the
cover, Dim� "D"�
3� If Dim� "D" is greater than Dim "C",
subtract Dim "C" from Dim� "D"� The
difference of these dimensions will
determine what total thickness of shim
gaskets will need to be installed between
the top of the glass cushion and the
cover�
Note: if Dim "C" and Dim� "D" measure the
same, no shim gaskets will be required�
4� Install proper thickness of shim gaskets,
if required, on top of the glass cushion
making sure that all gaskets are
centered on glass�
n� Install cover into place�
o� Turn assembly over making sure that all
components stay aligned and follow the
same procedures above for the opposite
side�
p� Threads on studs (3) and nuts (4) must be
cleaned of paint, rust, and scale� Apply a
light coat of oil to the threads and insert
bolts through the nameplate and two (2)
covers, and install nuts finger tight�
q� Use a torque wrench to tighten the bolts�
Tighten the bolts in a sequence as shown
in Figure 1� Tighten bolts in increments
of 5 ft·lb (7 Nm) or 50% of torque value as
shown in Table 3, whichever is greater�
Continue tightening sequence at 5 ft·lb
(7 Nm) max� torque until torque values in
Table 3 are reached�
r� Gaskets will become compressed a short
time after bolts are tightened and torque
values will decrease� Therefore, the sight
flow indicator must be retorqued after
24 hours in service, to values established in
Table 3 for the specific model dual window
sight flow indicator�
WARNING
Do not re-torque a sight flow indicator while under
pressure. A sight flow indicator in service must be
freed of all pressure or vacuum, allowed to reach
ambient temperature and be drained or purged of
all fluids before retorquing is performed. Failure
to follow this procedure can result in serious
personal injury or property damage.
s� Refer to Section 4�0 Installation and
Section 5�0 Operation when returning dual
window sight flow indicator to service�
FIGURE 3
"D"
Housing
"B"
Body
Cover
"C"
"A"
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