{"id":3107,"date":"2020-11-20T10:30:02","date_gmt":"2020-11-20T16:30:02","guid":{"rendered":"http:\/\/www.IpsenHarold.com\/?p=316"},"modified":"2025-06-18T16:33:05","modified_gmt":"2025-06-18T16:33:05","slug":"daily-vacuum-furnace-preventative-maintenance","status":"publish","type":"knowledge-center","link":"https:\/\/ipsenglobal.com\/ja\/knowledge-center\/daily-vacuum-furnace-preventative-maintenance\/","title":{"rendered":"\u771f\u7a7a\u7089\u306e\u4e88\u9632\u4fdd\u5168\u3002\u65e5\u5e38\u70b9\u691c\u8868"},"content":{"rendered":"
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\"Checklist\"<\/figure>\n<\/div>\n\n\n

Extending the life of your vacuum furnace through preventive maintenance will result in decreased downtime and increased productivity. <\/p>\n\n\n\n

In an effort to help you adhere to a carefully planned schedule, we have provided a few basic checklists for daily, weekly<\/a>, monthly<\/a> and semiannual<\/a> maintenance.<\/p>\n\n\n\n

Daily Checklist<\/h2>\n\n\n\n

Furnace Interior<\/h3>\n\n\n\n

\u2b1c Inspect the inside of the furnace for signs of dirt and oil, which can prevent the production of high-quality work.<\/p>\n\n\n\n

\u2b1c Check the condition of the hot zone heating elements and shielding and make sure there are no broken or missing retaining wires.<\/p>\n\n\n\n

\u2b1c Inspect the heat shields to ensure that distortion has not shorted out an element. Shield distortion is normal due to the alternate heating and cooling of the furnace over time.<\/em><\/p>\n\n\n\n

Seals<\/h3>\n\n\n\n

\u2b1c Check the O-ring or lip seal on the furnace door for grit and dirt that might cause vacuum leaks.<\/p>\n\n\n\n

\u2b1c Clean the chamber-door or bottom-head flange and lightly grease the O-ring with a thin coating of high-quality vacuum grease. If you have a rotating door with a lip seal, use graphite powder instead. DO NOT<\/strong> use grease on a lip seal. For information on installing a lip seal, check out this video on our YouTube page<\/a>.<\/em><\/p>\n\n\n\n

Pumps<\/h3>\n\n\n\n

\u2b1c Check the oil levels and condition of all pumps (e.g., roughing, booster, holding, diffusion). The roughing pump oil should be circulating. Cloudy or discolored oil may indicate the presence of moisture or other contamination.<\/p>\n\n\n\n

\u2b1c Check that the roughing pump is operating at 140 \u25cb<\/sup>F (60 \u25cb<\/sup>C). Adjust pump water miser as necessary [160 \u25cb<\/sup>F (71 \u25cb<\/sup>C) for gas ballasting operation].<\/p>\n\n\n\n

\u2b1c Check the temperature and cooling-water profile of the diffusion pump. Verify that the water lines are cool to the touch; it is recommended that they are at or under 85 \u25cb<\/sup>F (29 \u25cb<\/sup>C) at the inlet water supply fitting.<\/p>\n\n\n\n

\u2b1c Verify the crossover setting of the diffusion pump (normal range is 60-80 microns).<\/p>\n\n\n\n

\u2b1c Verify the vacuum level when the booster is activated. Adjust if necessary (28 to 29 inches of mercury). The adjustable vacuum component can be a vacuum switch, vacuum controller or a backset switch. This is not required if using a variable frequency drive.<\/em><\/p>\n\n\n\n

Valves & Gauges<\/h3>\n\n\n\n

\u2b1c During the first vacuum pumpdown of the furnace, make sure all valves actuate in proper sequence.<\/p>\n\n\n\n

\u2b1c Check all vacuum gauges to ensure they are properly responding to pumpdown pressures and set points.<\/p>\n\n\n\n

\u2b1c Check the settings on the backfill valve switch. Adjust if necessary. These adjustable components are typically vacuum switches.<\/p>\n\n\n\n

Water Lines<\/h3>\n\n\n\n

\u2b1c Check the water flow from each drain line. A reduction in water flow indicates restrictions that must be located and corrected. <\/p>\n\n\n\n