ABB RATOSIGHT 10A2235 Instruction Manual

ABB RATOSIGHT 10A2235 Instruction Manual Manual pdf 1 page image

1) Glass meter tubes have been designed to operateup to maximum design working pressures listedherein. This not to be construed as a certificationthat the tubes will not break at any pressure. Inher-ent material limitations can result in tube breakagedue to conditions beyond our control. For example,glass is a brittle material which may break uponimpact; glass if subjected to thermal shock maybreak; glass is notch sensitive in that scratches,nicks or cracks may result in breakage when pres-surized; incorrect installation or faulty operatingmethods can cause tube breakage regardless of op-erating pressure.2) Glass meter tubes are not recommended foreither hot or strong alkalies, fluorine, hydrofluoricacid, steam or water over 200 o F (93 o C). Glass me-ter tubes should be periodically inspected for signsof wear. Erosion, stress cracks, nicks or deepscratches provide early warning for tube replace-ment. With certain fluids, the glass may erodeevenly so wear is not visibly noticeable. If wear issuspected, the tube should be replaced in order toeliminate this potential cause of meter tube break-age.3) It is important that all materials of constructionbe compatible with the service to which the Meter isapplied. It is especially important that "O" ring mate-rial be compatible with the process fluid. Glass me-ter tube breakage can occur in those meters usingan "O" ring as an internal seal if the improper mate-rial is used. For example: VITON "O" RINGS MUSTNEVER BE USED FOR AMMONIA SERVICE; THECORROSIVE ATTACK OF AMMONIA ON VITON ISEXTREME, CAUSING THE "O" RING TO SWELLTO THE EXTENT OF BREAKING THE GLASS ME-TER TUBE.4) The Meter should never be subjected to exces-sive vibration. Avoid the use of quick acting devicesin the fluid stream in order to prevent shock waves,associated with such devices, from damaging themeter.5) The use of a pressure relief valve and/or arupture disc is recommended in the pipeline contain-ing the Meter and located such to preclude glassmeter tube breakage in the event of an overpressuri-zation of the line.6) When applied to a high pressure gas cylinder, atleast two stepdown pressure regulators are to beused between the Meter and the cylinder.7) Remove pressure from the Meter before at-tempting to remove the meter tube. 8) Be sure theparts that serve to lock the meter end fittings inplace are secure. This should be checked before theMeter is put into service or returned to service aftermaintenance. Loose end fittings may result in glassmeter tube breakage.9) The glass meter tube should be periodicallyinspected and replaced if cracked, nicked, scratchedor worn.INSTRUCTION MANUALVARIABLE AREA FLOWMETERS10A2235 Rev.5RATOSIGHT FLOW RATE INDICATORS