Emerson Yarway Color-Port 4511N Istruzioni per l'installazione, il funzionamento e la manutenzione - Pagina 3
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YARWAY COLOR-PORT
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
4 OPERATING INSTRUCTIONS - PLACING
GAUGE IN SERVICE
4.1 Start up Procedure
4.1.1 Open the gauge drain valve fully.
4.1.2 Open upper and lower isolation valves
if provided.
4.1.3 Crack the upper Welbloc
gauge valve.
4.1.4 Allow the gauge to heat without
pressure build up for 10 minutes.
4.1.5 Gradually close the drain valve and
allow the pressure to build up slowly in
the gauge for about 15 to 20 minutes.
4.1.6 Close the gauge drain valve tightly.
4.1.7 Fully open the upper and lower
Welbloc
/stuffing box gauge valves.
®
4.1.8 Gauge is now in service.
5 MAINTENANCE
5.1 Preparation for washdown, servicing gauge
auxiliaries or gauge inspection
Before performing any service or inspection
on gauges under pressure, the procedure
given below is recommended to evaluate
port condition. This includes gauge
washdown procedures, inspection and
adjustment of Auxiliaries (Illuminator, etc.).
The following procedure is recommended
to prevent exposure of personnel to
pressurized gauges with ports that require
replacement.
5.1.1 Close upper and lower isolation valves.
5.1.2 Close upper and lower Welbloc
stuffing box gauge valves.
5.1.3 Crack open drain valve(s) to slowly
depressurize gauge. When gauge is
depressurized, open drain valve(s) fully.
5.1.4 After cooling, remove Color-Port
viewing device (Hood, Direct View Hood,
Fiber-Port, etc.) and Illuminator.
5.1.5 Visually check mica-gasket-glass
assembly for a white or opaque
appearance. Check each port from
both sides of the gauge. Use a
flashlight for illumination. A white or
opaque appearance is an indication
that the protective mica shield has
been penetrated. The mica-gasket-
glass assemblies must be replaced
before placing the gauge back in
operation.
WARNING
Failure to promptly replace the mica-gasket-
glass assembly that appears white or opaque
can result in catastrophic failure of the glass
with violent discharge of hazardous high velocity
steam. The discharge of high velocity steam can
result in severe personal injury and property
damage.
WATER LEVEL GAUGES & WELBLOC
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Upper isolation
valve
Tie-bar assembly
/stuffing box
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Lower isolation
valve
Lower Welbloc
FIGURE 2A
Gauges with Tie-Bar, Welbloc
and Isolation Valves
5.2 Washdown Procedure
The level gauge connecting pipes, valves and
internal passageways must be kept free from
obstructions caused by sediment and rust
deposits in order for the gauge to provide the
proper level indication. Additionally, sediment
buildup on the mica can mask the true water
level. To minimize the influence of sediment
buildup, gauge washdown is recommended.
Yarway recommends the following washdown
procedures:
5.2.1
Gauges with Tie-Bar, Welbloc
Gauge Valves and Isolation Valves
(Figure 2A)
5.2.1.1 Open the upper and lower isolation
/
valves.
®
5.2.1.2 Close upper and lower Welbloc
gauge valves.
5.2.1.3 Slowly open drain valve(s) - water in
gauge will drain.
5.2.1.4 Close drain valve and slowly open
®
lower Welbloc
level in gauge will rise to the top.
Open lower Welbloc
completely.
5.2.1.5 Slowly open drain valve(s). Water
level in gauge will lower as flow rate
through lower Welbloc
connecting pipe increases. This will
clear sediment from lower Welbloc
gauge valve and connecting lines.
5.2.1.6 Close the drain valve. Water level in
gauge will again rise to the top of the
gauge.
Upper Welbloc
gauge valve
Drain valve(s)
®
gauge valve
Gauge Valves
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gauge valve. Water
®
gauge valve
®
gauge valve
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GAUGE VALVES
®
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Upper isolation
valve
level
gauge
Lower isolation
valve
FIGURE 2B
Gauges with Stuffing Box (S/B) Gauge Valves
and Isolation Valves.
®
®
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Upper stuffing
box gauge cock
Level gauge
Lower stuffing
box gauge cock
Drain valve(s)
3