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PENBERTHY SERIES H FLAT GLASS GAGES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
6.1 Hydrostatic test
DANGER
Liquid level gage installations should be brought
into service slowly to avoid excessive shock or
stress on the glass. Rapid pressurization or
sudden changes in temperature may cause glass
breakage. To avoid excessive thermal shock
or mechanical stress on glass, the connecting
gagecocks should be opened slightly and the gage
temperature and pressure allowed to equalize
slowly. If the gagecocks are equipped with ball
checks, the gagecocks must be opened all the
way after the pressure and temperature have
equalized to permit operation of the automatic
ball checks in the event of failure. Failure to
follow the recommended operating procedures
can result in death, severe personal injury and/or
property damage.
Take all precautions necessary to handle the
possibility of leakage during the test.
Hydrostatically pressure test all installations
to at least 100 psig (690 kPa) but less than
the design pressure and correct any leakage
before proceeding.
7 MAINTENANCE
WARNING
Use only qualified, experienced personnel who
are familiar with liquid level gage equipment and
thoroughly understand the implications of the
tables and all the instructions. DO NOT proceed
with any maintenance unless the liquid level gage
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 follow instructions can cause serious personal
injury and property damage.
The rate at which components degrade
is dependent upon a variety of conditions.
Pressure, temperature and process media all
influence the rate at which gage components
deteriorate. Higher temperatures can
accelerate the deterioration of gaskets,
cushions, glass and metals. Acids and similar
chemicals can break down the integrity
of almost any material. Concentration of
chemicals can accelerate the corrosion rate.
Emerson cannot create a blanket maintenance
schedule for every application.
The end user is the most familiar with the
process media and conditions and must
be responsible for creating a maintenance
schedule. The user must create maintenance
schedules, safety manuals and inspection
details for each liquid level gage. Realistic
maintenance schedules can only be
determined with full knowledge of the
services and application situations involved.
These will be based upon the user's own
operating experience with their specific
application.
If bolting, gasketing or glass on any section of
a multi-section gage is disturbed, all sections
must be checked for integrity and retorqued or
repaired as necessary.
On all installations, the following items should
be evaluated regularly by the user 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. Gage, for signs of leakage around gaskets
or at connections.
4. Gage, for signs of internal or external
corrosion.
7.1 Maintenance procedures
Glass should be given regular and careful
attention. Keep glass clean using a commercial
glass cleaner and a soft cloth. Inspect the
surface of the glass for any clouding, etching or
scratching or physical damage such as bruises,
checks or corrosion. Glass that is damaged
is weakened and may break under pressure.
Shining a light at approximately a 45° angle
will aid in detecting some of these conditions.
Typically, damaged areas will glisten more
brightly than the surrounding glass because
the light is reflected.
Detection of any damage, problem areas or
surface wear is sufficient evidence to take
the liquid level gage out of service. DO NOT
proceed with operation of the liquid level gage
until the glass has been replaced with a glass
replacement kit following the disassembly -
reassembly instructions in Section 8.
Shields showing any signs of clouding, wear
or deterioration are an indication that the
gage glass has been exposed, or could soon
be exposed to the contained fluid. Take liquid
level gage out of service immediately. DO NOT
proceed with operation of the liquid level gage
until shields and glass have been replaced
by following the disassembly-reassembly
instructions in Section 8.
Gasket leaks must be repaired immediately.
DO NOT proceed with operation of a liquid
level gage until gaskets have been replaced by
following Section 8 disassembly-reassembly
instructions.
Connection leaks at a flanged or threaded
connection should be corrected by tightening
the bolting at the connection or by taking the
liquid level gage out of service and wrapping
the connection threads with Teflon
all male pipe threads.
Corrosion may occur if the user has selected
an improper material for the liquid level gage
application. It is the responsibility of the user to
choose a material of construction compatible
with both the contained fluid and the
surrounding environment. If internal or external
corrosion is present, an investigation must be
performed immediately by the user. It may be
necessary to contact an authorized Penberthy
distributor to better determine the origin of the
corrosion.
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