PENBERTHY SIGHT FLOW INDICATORS
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
5.0 OPERATION
5.1 Pre-operational check
1� Check that all installation procedures have
been completed�
2� Check that bolts have been torqued to their
proper values as stated in Table 3�
3� Check that glass is clean and free of any
damage as described in Section 4�0�
4� Check to determine that all connections
are pressure tight�
5.2 Hydrostatic pressure test
1� Take all precautions necessary to handle
the possibility of leakage�
2� Hydrostatic pressure test installation to at
least 50 psig (340 kPaG), and correct any
leakage before proceeding�
5.3 Operating
WARNING
Dual window sight flow indicator installations
should be brought into service slowly to avoid
excessive shock or stress on glass. Rapid
pressurization of sight flow indicator can cause
glass breakage with resulting sudden release
of pressure, causing serious personal injury or
property damage.
6.0 MAINTENANCE
Use only qualified, experienced personnel who
are familiar with this equipment and thoroughly
understand all the instructions in this manual
for all maintenance�
WARNING
Do not proceed with any maintenance unless the
dual window sight flow indicator has been relieved
of all pressure or vacuum, has been allowed to
reach ambient temperature and has been drained
or purged of all fluids. Failure to do so can cause
serious personal injury or property damage.
6.1 Preventative maintenance
Create maintenance schedules, safety
manuals, and inspection details for each
specific installation of a dual window sight
flow indicator�
On all installations, regularly check the
following items for purposes of maintenance:
1� Glass, for cleanliness and signs of damage
or wear�
2� Shields, if used, for signs of clouding, wear,
or deterioration�
3� Sight flow indicator for signs of leakage at
gaskets, or at connections�
4� Sight flow indicator, for signs of internal or
external corrosion�
5� Bolt torque values�
Determine upon evaluation of your own
operating experience an appropriate
maintenance schedule necessary for the
specific application� Realistic maintenance
schedules can only be determined with full
knowledge of the services and application
situation involved�
6.2 Maintenance procedures
WARNING
Regular and careful attention must be given to
the cleaning and inspection of glass. Glass that is
etched or even slightly scratched is weakened and
may break under pressure. Design ratings listed
in Section 2.2 and 2.3 are no longer valid for sight
flow indicators that contain scratched, worn, or
otherwise damaged glass, and such glass must
be immediately replaced. Failure to do so can
cause serious personal injury or property damage.
1� Glass
a� Keep glass clean using a commercial
glass cleaner and a soft cloth� DO NOT
use a wire brush, metal scraper or any
device which could scratch the glass�
b� Inspect the surface of the glass for any
signs of clouding, etching, scratching,
or physical damage such as bruises,
checks or corrosion that penetrates the
outer surface of the glass� Shining a light
at approximately a 45° angle will aid
in detecting some of these conditions,
which will glisten more brightly than the
surrounding glass when reflecting light�
Detection of any such problem areas or
any surface wear is sufficient evidence
of damage� Immediately take sight flow
indicator out of service� Do not proceed
with operation of dual window sight
flow indicator until the glass has been
replaced by following the Disassembly-
Reassembly instructions in Section 7�0�
FIGURE 2
Bolt loosening sequence
Sizes ½" through 1"
2
3
Bolt loosening sequence
Sizes 1¼" through 8"
8
4
1
5
4
1
6
2
3
7
5
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