Jerguson 300L Series Installation, Operation & Maintenance Instruction Manual
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9 of 20OperationWarning: Rapid opening of isolation valves can cause glass breakage and/orpossible injury to personnel. Gages should be brought into service slowly. Followthe procedure outlined in Bringing Gage Into Service. Always warm up the gage slowly when it is used with a vessel containing hot fluid (seeSpecial Applications). Crack open the shutoff valves carefully, then wait until the gageis fully warmed up before opening them all the way. During system shutdown, it is bestto leave the shutoff valves open so the gage can cool and depressurize along with thesystem (keeping the shutoff valves closed during shutdown can trap high pressureliquid in the gage). For high pressure, high temperature, or hazardous fluid applications, the JergusonSafeView Shield protects operators in the event of glass or gasket failure. Refer tobulletin J100.34 for model and ordering information. Gages should be isolated periodically and the bolt torque checked to prevent leaks.This is especially important on gages used in intermittent operation or varying serviceconditions (see Special Applications). When putting a gage into service, always check for leaks and be certain the shutoffvalves are fully open with all vents and drains closed before leaving the site.Warning: When in service, the safety ball check shutoff valves on a gage mustbe fully open. A partially open valve may prevent the ball checks from seatingduring a gage failure, potentially resulting in physical injury to personnel and lossof process fluid. |
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