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Therefore, new mica is always required. The gauge glass must be kept clean to ensure the
visible water level in the chamber accurately represents the water level in the boiler.
The user must determine upon evaluation of his or her own operating experience an
appropriate maintenance schedule necessary for the specific application. Note that the
frequency and method of blow-down/purging may affect service life and performance of glass
level gauges. Realistic maintenance schedules can only be determined with full knowledge of
the services and application situation involved.
10.1 Cleaning of connection lines (f) (see sketch chapter 6)
•
Close valves (h, j, c, g) tightly.
•
Use vent plug (a) to make level gauge and connection lines (f) pressureless.
Carefully open vent plug (a) one turn.
•
Further measures as described under point 8.1.
Commissioning of level gauge as described under point 8.2 / 8.3.
10.2 Cleaning of level gauge
Close indicator valves (h, j). Carefully unfasten plug (n) on main shutoff valves (c, g) to
relieve high pressure of level gauge (k). Remove plug (n).
•
Drain indicator liquid through drain opening (q) by unfastening adjusting screw (r) and
collect liquid in a container. Respect safety regulations of "indicator liquid". Marking
"indicator liquid" is written on the container.
Observe enclosed safety data sheet!
•
Remove plug (m). Purging of level gauge with water through plug (n).
Insert circular brush in opening at plug (m) during purging and clean glasses through
opening at plug (n) on indicator valve (h). Firmly tighten adjusting screw (r) and plug (m).
•
For filling and adjusting level gauge with connection lines see points 8.2 and 8.3.
10.3 Replacement of glasses
•
Loosen screw connections (5, 7) and remove cover rail (6), pressure plate (4) and
glasses (2). Carefully remove the seals (1,3) without damaging the contact and sealing
surfaces.
•
Clean the sealing and contact surfaces and carefully carry out the assembly with the
new seals (1), glasses (2) and gaskets (3) in the sequence shown (indicator cross-
section).
• Tighten screws (5, 7) from top to bottom starting in the middle of sight opening
-using successively opposite diagonal tightening
21
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