Jerguson 300L Series Installation, Operation & Maintenance Instruction Manual
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11 of 20Blow-down should be conducted on a routine basis, or as necessary based on water quality.Conducting blow-down more often than required to keep glass clean can lead to prematuremica and glass wear, and eventually leakage or glass failure.Maintenance Inspecting Glass: Inspect the glass regularly for any signs of clouding or scratching. Innew processes, the gage glass should be inspected routinely until the need forreplacement becomes apparent. To examine the glass for scratches, shine a verybright, concentrated light at about a 45° angle. Anything that glistens brightly shouldbe looked at closely. Any scratch that glistens and catches a fingernail and/or any star-shaped or crescent-shaped mark that glistens is reason for replacement. An inner(chemical) glass surface that appears cloudy or roughened and can’t be cleaned haslikely been chemically attacked and should be replaced. Cleaning Glass: Glass gages may be taken out of service and the glass cleanedthrough a top-mounted offset pattern valve. Keep glasses clean using commercialglass cleaners (Windex, Glass Wax, Bon Ami, Lava Soap, Super Soilax, householddetergents, etc.). Where regular cleaners do not work, use dilute acids such ashydrochloric (muriatic) acid. Carefully observe safety rules when handling thesechemicals. Cleaning should be done without removing the glass. This may requirecirculating the cleaner if the process side of the glass is not accessible. Never useharsh abrasives, wire brushes, metal scrapers, etc. that could scratch the glass. DONOT attempt to clean any glass while the gage is in service. Receiving / Storing Glass: Upon receiving replacement glass, inspect the container andglass for shipping damage. When inspecting glass, unwrap and rewrap carefully.Avoid contact of the polished faces with any object (including table tops). Keep theglass in its original box until ready to use. Take care not to bend mica when handling,and avoid touching the face of the mica shield. Store it with the glass in the original boxto protect against accidental breakage. Disassembly: Prior to disassembly, be sure the gage is depressurized and at ambienttemperature. Failure to do so may result in a sudden release of pressure and/or glassbreakage. Loosen the end nuts/bolts first, working from opposite ends toward thecenter. Reassembly: The cutaways below show the construction of Reflex and Transparentglass gages. |
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