4
Penberthy
SErIES N6 GaGEcockS
InstallatIon, operatIon and maIntenance InstructIons
4 InstallatIOn
Installation should only be undertaken by
qualified, experienced personnel who are
familiar with this equipment and 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 the specific size
and model of gagecock set.
4.1 Mounting
1. Prior to actual installation, turn handwheel
or lever of each gagecock clockwise until
stem closes against seat.
2. Mount upper and lower gagecocks to vessel
using PTFE tape on all male tapered pipe
thread connections.
3. Tighten vessel connections to a pressure
tight joint making certain that sight glass
connections are aligned vertically and to
vessel centers as called for on application
specification.
4.2 sight glass installation
1. Turn upper gagecock counterclockwise
(approx. ⅛ turn).
2. Loosen glass packing nut to insure there is
no compressive force on glass packing.
3. Insert sight glass in upper gagecock sight
glass connection.
4. Tighten upper gagecock to original position
while holding sight glass in position with
upward force to insure its clearing of lower
sight glass connection. check vertical
alignment of gagecocks.
5. Loosen glass packing nut on lower
gagecock and pull glass down into lower
gagecock sight glass connection to a
positive stop.
6. Tighten upper and lower glass packing nuts.
note:
in some circumstances, it may be
necessary to remove glass packing nut,
glass packing gland and glass packing, and
mount them on sight glass prior to insertion
of glass in upper and lower gagecock
bodies. See Figure 1 for proper assembly
sequences.
4.3 guard rod installation
Guard rods (two required) are assembled
downward through upper gagecock with
swaged portion on rods at the top. Bottoms of
rods are positioned into respective holes in the
lower gagecock.
5 OPeratIOn
5.1 Pre-operational check
1. assure that all installation procedures have
been completed.
2. check to determine that all connections are
pressure tight.
5.2 hydrostatic test
1. Take all precautions necessary to handle
the possibility of leakage during the test.
2. Hydrostatic pressure test all installations to
100 psig (690 kPaG) and correct any leakage
before proceeding.
5.3 Operating
Gagecock assemblies should be brought
into service slowly. The tubular glass used in
Penberthy gagecocks is tempered and can
stand minimal thermal shock and mechanical
stress.
To avoid excessive thermal shock or
mechanical stress on the tubular glass, the
connecting gagecocks should be opened
slightly and the tubular glass temperature and
pressure allowed to equalize slowly with the
vessel.
If the gagecocks are furnished 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 check
in the event of tubular glass breakage.
6 MaIntenanCe
Maintenance should only be undertaken by
qualified, experienced personnel who are
familiar with this equipment and have read and
understood all the instructions in this manual.
During system shut down, the gagecocks
should be left open to permit the gage to lose
pressure and cool with the rest of the system.
Failure to leave the gagecocks open during
system shut down will trap high pressure fluid
in the gage.
WarnIng
Do not proceed with any maintenance unless the
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 any instructions could result in
severe personal injury or property damage.