4
PENBERTHY SERIES 500 AND 700 OS&Y ARMORED GAGECOCKS
InstallatIon, operatIon and maIntenance InstructIons
5 INSTALLATION
Installation should only be undertaken by
qualified personnel who are familiar with this
equipment.
They should have read and understood all
of the instructions in this manual. The user
should refer to relevant technical data sheets
or product proposal to obtain dimensional
information for specific size and model
gagecock.
Recommendations on gagecock installations
are not necessarily related to the installation
of flat glass liquid level gages. The number
of different types of gage and gagecock
installations is too great to explain adequately
in an installation manual. Therefore, it is
the user's responsibility to assure that
knowledgeable installation personnel plan and
carry out the installation in a safe manner.
The following are some of the guidelines that
should be employed:
4 INSPECTION
On receipt of a gagecock set, check all
components carefully for damage incurred
during shipping. If damage is evident or
suspected, do not attempt any installation.
Notify the carrier immediately and request a
damage inspection. Refer to exploded view
drawings in Sections12 and 13 to inventory
parts.
4.1 User’s rating inspection
The user should confirm that:
1. The gagecock set model number and
pressure/temperature rating stamped on
the nameplate conforms to the description
on the user's purchase order.
2. The operating conditions described in
the purchase order agree with the actual
operating conditions at the installation site.
3. The actual operating conditions at the
installation site are within the application
data shown on the relevant technical data
sheet or product proposal referred to
previously.
4. The materials of construction of the
gagecock set are compatible with both
the contained fluid and the surrounding
atmosphere in the specific application.
SAFETY INSTRUCTIONS
If the size, model or performance data of the
gagecocks as received does not conform with
any of the criteria above, do not proceed with
installation. Contact an authorized Penberthy
distributor for assistance. The incorrect gagecock
can result in unacceptable performance and
potential damage to the gage.
5.1 Piping strain
The gagecock should be mounted and
connected so that it can support the gage
without binding. Torsional stresses can make
it difficult or impossible to seal tailpipes.
Although union connections will allow marginal
errors in piping alignment, misalignment can
still create unusual strain on connectors. Gages
not properly supported by brackets may subject
the gagecock to stresses that can cause leaks
or mechanical failure. Typical gage load should
NOT exceed 50 lbs (22.7 kg) per gagecock.
5.2 Differential thermal expansion
High mechanical loading may be imposed on a
gagecock by expanding and contracting gages
due to hot or cold service. Such mechanical
loads on the gagecock must be minimized by
controlling process conditions in the system
or by using expansion loops or stuffing boxes
(Model 780).
3.2 Steam application
Penberthy series 780 gagecocks are designed
for steam/water flat glass gages. The stuffing
box attaches to the gagecock body with a
coupling nut. A special nipple extends from the
gage glass to the stuffing box where packing is
compression fit around the nipple like tubular
glass. The gage rests on the bottom gagecock
while the coupling nuts are tightened.
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