Steam joint and stationary siphon – for optimum dryer ... - Voith

Voith PaperSteam joint and stationary siphon –for optimum dryer performanceA proven and sound conceptn Several thousand papermachines equipped in morethan 100 yearsn For all paper grades, operatingspeeds and pressuresn The design follows the stateof the art in paper machinedevelopmentn Steam joints and siphons areconsidered part of the steamand condensate systemn Stationary siphons have beenin use for over 50 yearsResultsn Reliable operationn Light and compact yet ruggedn Adapted to the environment,not vice versan Easy carbon ring changen Long service lifen Low maintenance and repairrequirementsYour benefitsn Latest state of the art appliedwith new machine installationsn A rebuild of existing machinesreflects the experience with newmachine installationsn Simple design, easy to handlen Lowest differential pressuresand blow-through steam flows,lowest steam lossesn Increased production, fewerproduction interruptions, betterenergy usage, low maintenancecost

Steam joint and stationary siphon –for optimum dryer performanceThe stationary siphon is suitable for every application as long as thesteam joint can be soundly mounted to the bearing or gearbox cover.It is likewise suitable for low operating speeds and sump condition asit is for highest operating speeds and rimming condition.In all cases the differential pressure is minimal since it is independentof any centrifugal forces. The siphon shoe remains always in thecondensate, flooding of dryers is, therefore, not possible.A temperature stable siphon support pipe, firmly held inside of thesteam joint, keeps the siphon shoe at the proper clearance to thedryer shell as set when the dryer is cold. Optimum effectivenessDifferential pressure and blowthroughsteam flow stay constant atapprox. 150 mbar (2.3 psi) and 5%for all speeds.In comparison to a rotating siphonat 1400 m/min (4600 fpm) it isapprox. 800 mbar (12 psi) and 30%.Carbon ring sealn The glide ring compensates forradial misalignmentn The spherical piston compensatesangular misalignmentn Large carbon wear reserven Status of carbon wear is visibleand measurablen A mechanical stop preventsmetal-to-metal contactn Spring loading for negativeoperating pressures

Carbon ring changen Removal of elbow and housingn Replacement of the carbon ringn Re-installation of housing andelbown Adjustment of stop pins forcarbon wearOverhaul of the housingn Insertion into the pistonpush-down devicen Removal of the pistonn Replacement of the seal ringAvailable sizesn Steam connections:50 / 65 / 80 / 100 / 125 / 150 mm2“ / 21/2“ / 3“ / 4“ / 5“ / 6“n Condensate connections:32 / 40 / 50 / 65 / 80 mm11/4“ / 11/2“ / 2“ / 21/2“ / 3“n Siphon diameters:16 / 19 / 22 / 26 / 29 / 32 mm.63“ / .75“ / .87“ / 1“ / 1.14“ / 1.26“Insulation sleeveInsulation sleeves protect the dryerbearing from heatSpecial designsn Steam inlet only, as a rule ondrive siden Condensate outlet only, as arule on tending side.On tending side with extendedpiston length for CARB**(Compact Angular RollerBearing) bearings, for compensationof dryer expansion** SKF TrademarkImportant featuresn Two anchor rods - due to theirlength insensible againsttemperature variations - hold thesiphon support pipe securely inits position.n The entering steam flows alongthe support pipe on both in- andoutsides and the condensateflows back in a separate pipe.Thus, the support pipe is notinfluenced by temperaturedifferences between steam andcondensate and is, therefore,temperature stable.n The siphon holder can be madehorizontally adjustable. This canbe advantageous when there isonly unreliable informationavailable about the location ofthe balancing weights inside ofthe dryer.n The siphon pipe can bearranged vertically as well asinclined in order to place thesiphon shoe as close aspossible to the end of thedryer shell at a given dryerhead contour.n The siphon shoe is made ofTeflon and prevents the dryershell from being damaged,should both get in contact.n A whirl chamber in the siphonshoe assures safe condensateremoval at lowest differentialpressures and blow-throughsteam flows.

Contact for Joints, Siphonsand Spoilerbars:Voith Paper GmbH & Co. KGHeidenheim, GermanyTel. +49 7321 37-3848Voith Paper GmbH & Co. KGHeidenheim, GermanyTel. +49 7321 37-2752Voith Paper GmbH & Co. KGRavensburg, GermanyTel. +49 751 83-01Voith Paper OyVantaa, FinlandTel. +358 10 21844-00Voith Paper ABSpanga (Stockholm), SwedenTel. +46 8 62207-40Voith Paper ASLier, NorwayTel. +47 3285-9100Voith Paper Ltd.Manchester, Great BritainTel. +44 161 643-9273Voith Paper SASOrsay, FranceTel. +33 164865-570Voith Paper S.A.Tolosa (Guipúzcoa), SpainTel. +34 943 67-3799Voith Paper S.r.L.Schio (Vicenza), ItalyTel. +39 0445 690-500Voith Paper GmbHSt. Pölten, AustriaTel. +43 2742 806-0Voith Paper TechnologyRussia GmbHSt. Petersburg, RussiaTel. +7 812 325-8203Voith Paper Inc.Appleton (WI), USATel. +1 920 731-7724Voith PaperMáquinas e Equipamentos Ltda.São Paulo (SP), BrazilTel. +55 11 3944-4000Voith Paper (China) Co., Ltd.Kunshan, ChinaTel. +86 512 5799 3600Voith Paper Co., Ltd.Tokyo, JapanTel. +813 3277-4102Voith Paper Technology Ltd.Calcutta, IndiaTel. +91 33 2300-5000PT. Voith PaperJakarta, IndonesiaTel. +62 21 7884 5922info.voithpaper@voith.comwww.voithpaper.comvp pmg 3349 en zp/wahl 1500 2008/05