Cannon HTHS Series II Instruction & Operation Manual

Cannon HTHS Series II Instruction & Operation Manual Manual pdf 40 page image

37CANNONCANNONCANNONCANNONCANNON® High-Temperature High-Shear Viscometer Series II Instruction & Operation ManualRevision 1.0d—June, 2011;CANNONCANNONCANNONCANNONCANNON® Instrument Company2139 High Tech Road • State College, PA 16803 • USACHAPTERB APPENDIX B—HTHSRUPTURE DISC REPLACEMENTReplacing an HTHS rupture discWARNING There is no guarantee of rupture disc life. Disc life span is affected bycorrosion, creep and fatigue, and physical damage. These conditions willderate the rupture disc to a lower set pressure. The user should beprepared to handle a premature failure of the rupture disc. Do not allowany buildup or solidification of media to occur on a rupture disc. This mayincrease the pressure setting of the rupture disc.CAUTION The ½” STANDARD rupture disc is a precision instrument and must behandled with extreme care. Rupture discs should be installed only byqualified personnel familiar with rupture discs and proper piping prac-tices.Do not install rupture disc if there is any damage in the dome area. Adamaged rupture disc is any rupture disc with visible nicks or dents in thedome.The rupture disc manufacturer does not recommend reinstalling arupture disc that has been removed from the holder. Always reinstall theentire rupture disc assembly, as reinstallation of the disc alone mayadversely affect the joint sealing capabilities and/or performance of therupture disc.NOTE The angular seat rupture disc design is rated for up to 700+ psig.InstallationThe rupture disc for the HTHS Series II instrument is sold and installedas an assembly that includes the rupture disc itself, vacuum support andholddown ring, conical threaded outlet and inlet connector. The rupturedisc assembly is connected inline with the HTHS pressure system via athreaded connection on the inlet hex (see images, next page).The SCREW TYPE rupture disc assembly is permanently stamped with amaximum burst pressure rating. Ensure that the unit being installed iscompatible with current operating conditions. Install the unit "upsidedown" with the outlet hex toward the floor of the compartment.In theevent of a rupture disc failure, this will direct the gas pressure away frommore sensitive internal components.

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