Foreline traps Foreline traps

Section 3.1Foreline trapsIntroductionRoughing componentsRoughing componentsSection 3.1Foreline trapsIntroductionThe MDC Vacuum familyof roughing line trapsFeaturesn Molecular sieve trapSingle-piece coaxial trapTwo-piece coaxial trapLiquid nitrogen trapMolecular sieve trapsMolecular sieve traps containing type13X synthetic zeolite effectively preventoil backstreaming and trap water vapoursat room temperature. Type 13X zeolitewill absorb molecules with criticaldiameters up to 10 angstrom. The sievecharge can be reactivated by baking outin place when a base vacuum cannot beachieved. A valve should be used toisolate the evolved gas from the systemduring the bakeout cycle. During bakeouta mechanical pump removes the evolvedgases from the sieve trapping material. Tominimize downtime, bakeouts can beconducted with the aid of a timer, duringsystem offhours. Oils trapped by thesieve material will not be evolved bybaking. Periodic replacement of the sievematerial is required whenever the sievematerial exhibits evidence ofhydrocarbon saturation as determined byempirical observation. The sieve trappingmaterial is easily replaced through a portfitted to the top of the trap.Molecular sieve traps can be mounted ina vertical or horizontal position. Onceturned on, the heater reaches andmaintains a self-regulated and constant150°C temperature. Bakeout timedepends on the amount of water vapourloading of the zeolite and can range fromfour to twelve hours.Coaxial trapsCoaxial foreline traps offer easymaintenance and room-temperatureoperation, they require no bakeout orcooling and are virtually maintenancefree. They are ideally suited for trappingroughing pump hydrocarbons frombackstreaming into a vacuum system.Single-piece coaxial foreline traps containabsorbent filter cartridges with a bronzewool element. This filter element ispermanently sealed inside the trap’s bodyand can’t be removed or replaced. Thesetraps are serviced by replacing them witha spare unit while cleaning thecontaminated trap. Single-piece traps areavailable in 100mm and 150mm bodydiameters.In contrast to the single-piece units, thetwo-piece coaxial foreline traps offer awider selection of filter elementmaterials. Filter elements for a two-piecetrap are removable, stainless steel screencartridges filled with copper, stainlesssteel or bronze wools, activated alumina,activated carbon or dual-elementabsorbent materials.During operation, pump oil coalesces onthe element and returns to the pump.Activated alumina effectively adsorbsacids and water vapour while activatedcarbon adsorbs organics and watervapour. Filter cartridges are quickly andeasily replaced by removing thebanded clamp that fastens the twopiecebody.MDC Vacuum Limited recommendskeeping a spare element onhand for aquick change to minimize down time.Reusable elements may be cleaned andready for the next exchange.Note that filter elements are notincluded with trap assemblies andmust be ordered separately.Two-piece traps are offered with 50, 100,150 and 200mm body diameters. Allcoaxial trap bodies are made of type 304stainless steel and are offered with achoice of hose or flange style connections.CF metal seal flange connections have onefixed and one rotatable flange foralignment purposes. ISO KF and ISO LFflanges are clamp-style. Hose connectionsmay also be welded, but permanentinstallation must be carefully evaluated.Liquid nitrogen trapsLiquid nitrogen traps removecondensables before they enter the pumpor backstream from the pump to thevacuum system. Water trapping by theliquid nitrogen cooled surface is completeand permanent.Liquid nitrogen traps can be fitted with acustomer-supplied coolant level controllerto automatically replenish consumed liquidnitrogen.In general, trap performance will vary withthe specific application, usage, number ofprocess cycles and relative humidity in theregion. One cycle per day in an R&Dapplication could provide approximately sixmonths ofmaintenance freeservice.Production typeapplications willrequire morestringentpreventativemaintenanceprograms tailoredto a specificapplication.Centring ringReplaceablefilter elementTubeBand clampTrap bodyConnectionCoaxial, single-piece trapsMolecular sieve trapsLiquid nitrogen trapsCoaxial, two-piece trapsAll dimensions are nominal in millimetres unless specifiedAll dimensions are nominal in millimetres unless specified182MDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.ukMDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.uk183

Section 3.1Foreline trapsMolecular sieveRoughing componentsRoughing componentsSection 3.1Foreline trapsMolecular sieveUHV and HV seriesCFCF PortsØ TubeATypTrap Tube Body Body Overall Wtsize Flange dia. dia. height height A B kg100 DN16CF 19.1 114 133 162 127 43 1.8100 DN40CF 38.1 114 200 229 119 51 2.5ReferenceE-MST-075-2E-MST-150-2Partnumber431035431040£228246€342369BRotatableflangeSieve materialHeater elementFixedflangeBodyheightOverallheightISO KFFeaturesnnnnnEffectively blocks backstreaming by absorbinghydrocarbonsTraps water vapourRegeneration using built-in heater304 stainless steel trap bodyAvailable in four sizesDescriptionMolecular sieve traps containing type 13X synthetic zeoliteeffectively prevent oil backstreaming at room temperature.They also trap water vapour in the sieve charge. The sievecharge can be reactivated by baking out in place when thebase vacuum cannot be achieved. A valve should be used toisolate evolved gas from the system during bakeout cycle.During bakeout the mechanical pump removes the evolvedgas from the sieve trapping material. Normal bakeout canbe accomplished by use of a timer during system off hours.Any oils trapped by the sieve material cannot be removedby baking. Periodic replacement is required whenever thesieve material exhibits evidence of hydrocarbon loading asdetermined by empirical observation. Sieve trappingmaterial can be replaced through port on top of trap. Trapscan be mounted in the standard vertical or horizontalposition.The heater reaches and maintains a self-regulated constant150°C temperature. Bakeout time depends on the amountof water vapour loading of the zeolite, within the range offour to 12 hours.ISO KF and LF portsKF 19.1 to 50.8 tube diameterLF 76.2 tube diameterØ TubeHose connectionØ TubeGround lugATypATypØ BodyØ BodyBFiller plugBBodyheightBodyheightOverallheightOverallheightHose connectionAccessoriesTrap Tube Body Body Overall Wtsize Flange dia. dia. height height A B kg100 DN16KF 19.1 114 133 162 127 43 1.8100 DN25KF 25.4 114 133 162 118 43 2.3100 DN40KF 38.1 114 200 229 119 51 2.5100 DN50KF 50.8 114 200 229 119 51 2.7Trap Body Body Overall Wtsize dia. height height A B kg100 114 133 162 114 43 1.8100 114 133 162 114 43 2.3100 114 200 229 114 51 2.5100 114 200 229 114 51 2.7WtDescriptionkgMolecular sieve replacement charge, type 13x, 0.5-0.2 kg 0.7Replacement heater assembly, 220-240V AC 0.1ReferenceE-KMST-075-2E-KMST-100-2E-KMST-150-2E-KMST-200-2ReferenceE-MST-075E-MST-100E-MST-150E-MST-200ReferenceMST-CE-MST-HPartnumber431036431038431041431045Partnumber431034431037431039431044Partnumber431013431046Gas handling loadNumberMechanical Recommended (50% relative Capacity Trap reference chargespump size trap tube size humidity) gm number required£245255260275£218206227250£2538€368371390413€327327341375€3857Up to 15 m 3 /hr 19 & 25 1.7m 3 500 E-MST-075 & -100 1Ø Body15 to 27 m 3 /hr 38 3.5m 3 726 E-MST-150 227 to 51 m 3 /hr 50 3.5m 3 726 E-MST-200 2All dimensions are nominal in millimetres unless specified Weights given are approximateAll dimensions are nominal in millimetres unless specified Weights given are approximate184MDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.ukMDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.uk185

Section 3.1Foreline trapsCoaxialRoughing componentsRoughing componentsSection 3.1Foreline trapsCoaxialUHV and HV seriesCFFixed flangeTrap Tube Body Wtsize Flange diameter diameter kg100 DN16CF 19.1 102 1.1100 DN40CF 38.1 102 2.0ReferenceTX-075-2TX-150-2Partnumber430000430006£126139€175208Ø Tube56typ114RotatableflangeISO KFFeaturesnnnnnSignificantly reduces oil backstreamingLow cost one-piece body designBronze wool element304 stainless steel trap body100mm and 150mm body diameters19.1 to 50.8 tube dia.: KF63.5 to 101.6 tube dia.: LFØ TubeØ BodyFlange LengthISO KF 56.1ISO LF 57.2Trap Tube Body Wtsize Flange diameter diameter kg100 DN16KF 19.1 102 1.1100 DN25KF 25.4 102 1.4100 DN40KF 38.1 102 2.0100 DN50KF 50.8 102 2.3100 DN63KF 63.5 102 2.3150 DN100LF 101.6 152 3.0ReferenceKTX-075-2KTX-100-2KTX-150-2KTX-200-2LTX-250-2LTX-400-2Partnumber430050430051430052430053430054430055£117121135148198320€162169188215297480DescriptionCoaxial foreline traps offer easy maintenance and roomtemperature operation, they require no bakeout or coolingand are virtually maintenance-free. They are ideally suitedfor trapping roughing pump hydrocarbons and preventingthem from backstreaming into a vacuum system. Singlepiececoaxial foreline traps contain absorbent filtercartridges filled with a bronze wool element. This filterelement is permanently sealed inside the trap’s body andcan’t be removed or replaced. These traps are serviced byreplacing them with a spare unit while cleaning thecontaminated trap. Single-piece traps are available in 100mmand 150mm body diameters.Trap bodies are manufactured from type 304 stainless steel.Traps are offered with a choice of hose or flangeconnections. CF metal seal flange connections have onefixed and one rotatable flange for alignment purposes. KFand LF ISO flanges are clamp-style.Ø TubeØ Body11451typ114.3Hose connectionTrap Tube Body Wtsize diameter diameter kg100 19.1 102 1.2100 38.1 102 2.0100 50.8 102 2.3100 63.5 102 2.3150 101.6 152 3.0ReferenceTX-075TX-150TX-200TX-250TX-400Partnumber430002430008430011430014430020£102112114130227€143162171188341Hose connections may also be welded, but permanentinstallation is not recommended. Used traps may be cleanedwith a solvent and allowed to dry before replacing intoservice. MDC Vacuum recommends having a spare trapavailable for rapid replacement to minimize down time. Theused unit may be cleaned and stored for re-use asconvenient.Ø BodyAll dimensions are nominal in millimetres unless specifiedAll dimensions are nominal in millimetres unless specified Weights given are approximate186MDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.ukMDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.uk187

Section 3.1Foreline trapsCoaxial with replaceable filterRoughing componentsRoughing componentsSection 3.1Foreline trapsCoaxial with replaceable filterUHV and HV seriesCFFeaturesnnnnnnSignificantly reduces oil backstreamingTwo-piece clamped body design for easy element replacementChoice of copper, stainless steel, bronze, activated alumina andactivated carbon filter elements50mm to 200mm body diameters304 stainless steel trap bodyViton ® O-ring body sealTrap Tube Body Body Overall Clamp Wtsize Flange dia. dia. height height 00 kg50 DN16CF 19.1 51 135 237 115 0.9100 DN40CF 38.1 102 135 222 137 2.3150 DN63CF 114.3 150 180 275 184 7ReferenceDFT-2075-2DFT-4150-2DFT-6250-2Partnumber433002433014433026£143215351€215299526Fixed flangeISO KF and ISO LFDescriptionIn contrast to the single-piece units on the previous twopages, the two-piece coaxial foreline traps offer a widerselection of filter element materials. Filter elements for atwo-piece trap are removable stainless steel screencartridges filled with copper, stainless steel or bronzewools, activated alumina, activated carbon or dual elementabsorbent material.During operation, pump oil coalesces on the element andreturns to the pump. Activated alumina effectively adsorbsacids and water vapour, while activated carbon adsorbsorganics and water vapour. Filter cartridges are quickly andeasily replaced by removing the banded clamp that fastensthe two-piece body. MDC Vacuum recommends keeping aspare element on-hand for a quick change to minimizedown time. Re-usable elements may be cleaned and readyfor the next exchange.CF PortsBodyheightØ TubeRotatableflangeBodyheightØ TubeØ BodyØ ClampØ ClampOverallheightOverallheightHose connectionTrap Tube Body Body Overall Clamp Wtsize Flange dia. dia. height height 00 kg50 DN16KF 19.1 51 135 237 115 0.950 DN25KF 25.4 51 135 220 115 0.9100 DN16KF 19.1 102 135 237 137 2.3100 DN25KF 25.4 102 135 220 137 2.3100 DN40KF 38.1 102 135 222 137 2.3100 DN50KF 50.8 102 135 223 137 2.3150 DN40KF 38.1 153 180 266 184 6.8150 DN50KF 50.8 153 180 267 184 6.8150 DN63LF 63.5 153 180 269 184 6.8200 DN63LF 63.5 203 256 345 243 11.4200 DN100LF 101.6 203 256 345 243 11.4200 DN160LF 152.4 203 256 345 243 11.4Trap Tube Body Body Overall Clamp Wtsize dia. dia. height height 00 kg50 19.1 51 135 210 115 0.9100 38.1 102 135 210 137 2.3ReferenceKDFT-2075-2KDFT-2100-2KDFT-4075-2KDFT-4100-2KDFT-4150-2KDFT-4200-2KDFT-6150-2KDFT-6200-2LDFT-6250-2LDFT-8250-2LDFT-8400-2LDFT-8600-2ReferenceDFT-2075DFT-4150Partnumber433003433006433009433012433015433018433021433024433027433033433039433042Partnumber433001433013£143148182191201210267276337585627703£126179€2082152542662792933713844758789411055€189260Two-piece traps are offered with 50, 100, 150 and 200mmbody diameters. All coaxial trap bodies are made of type304 stainless steel and are offered with a choice of hose orflange style connections. CF metal seal flange connectionshave one fixed and one rotatable flange for alignmentpurposes. ISOKF and ISOLF flanges are clamp-style. Hoseconnections may also be welded, but permanent installationmust be carefully evaluated. Contaminated traps may becleaned with a solvent and allowed to dry before replacinginto service. Filter elements are not included with trapassemblies; they must be ordered separately from thetables on page 191.ISO and KF portsBodyheightØ TubeØ BodyØ ClampOverallheightHose connectionØ BodyAll dimensions are nominal in millimetres unless specifiedAll dimensions are nominal in millimetres unless specified Weights given are approximate188MDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.ukMDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.uk189

Section 3.1Foreline trapsFilter elementsRoughing componentsRoughing componentsSection 3.1Foreline trapsFilter elementsFilters for two-piece coaxial trapsFeaturesnnnEasy exchange of cartridgesMetal sieve units are reusableUse with two-piece coaxial trap bodiesDescriptionTwo-piece coaxial foreline traps offer a wide selection ofreplaceable filter element materials. Filter elements for a twopiecetrap are removable stainless steel screen cartridges filledwith copper, stainless steel or bronze wools, activated alumina,activated carbon or dual element absorbent material.Metal wool filter elements are used primarily for the trappingof pump oil backstreaming through a vacuum system. Duringpump operation, oil coalesces on the metal wool element anddrains back to the vacuum pump. Activated alumina effectivelyadsorbs both acids and water vapour while activated carbonadsorbs organics and water vapour. The selection chart at thebottom of the facing page will help in choosing a filter elementfor your specific application.Filter cartridges are quickly and easily replaced by removing thebanded clamp that fastens a two-piece coaxial trap body. Tominimize down time, MDC Vacuum recommends keeping sparefilter elements on-hand for quick replacement. Re-usableelements may be cleaned and stored for the next exchange.With the exception of the activated carbon and dual elementfilters, all others are re-usable. Filter elements are not includedwith trap assemblies and must be ordered separately using thepart numbers detailed on the next page. Filters for 50, 100, 150and 200mm body diameters are included. Contaminatedelements may be cleaned with a solvent and allowed to drybefore re-using.CopperBronzeActivatedcarbonStainless steelActivatedaluminaDual elementFilter element selection tableUse with 50mm body trapsCopper sieve elementStainless steel sieve elementBronze sieve elementActivated alumina cartridge 2Activated carbon cartridge 2Use with 100mm body trapsCopper sieve elementStainless steel sieve elementBronze sieve elementActivated alumina cartridge 2Activated carbon cartridge 2Dual element ac/fg 1,2Use with 150mm body trapsCopper sieve elementStainless steel sieve elementBronze sieve elementActivated alumina cartridge 2Activated carbon cartridge 2Dual element ac/fg 1,2Use with 200mm body trapsCopper sieve elementStainless steel sieve elementBronze sieve elementActivated alumina cartridge 2Activated carbon cartridge 21Activated carbon and fibreglass2Requires initial pump-downStainlesssteel Copper BronzeActivatedaluminaReferenceDFT-2F-CUDFT-2F-SSDFT-2F-BRDFT-2F-AADFT-2F-ACDFT-4F-CUDFT-4F-SSDFT-4F-BRDFT-4F-AADFT-4F-ACDFT-4F-DEDFT-6F-CUDFT-6F-SSDFT-6F-BRDFT-6F-AADFT-6F-ACDFT-6F-DEDFT-8F-CUDFT-8F-SSDFT-8F-BRDFT-8F-AADFT-8F-ACActivatedcarbonPrevent oil back-streaming ••• ••• ••• • • •••Trap water vapour •• ••Trap organics ••• •••Trap acid vapours•••DualelementPartnumber433050433051433052433053433054433055433056433057433058433059433060433061433062433063433064433065433066433067433068433069433070433071£20182321383027322744130515459558015410293121109125Effective rating••• Very good•• Good• Fair€3030323257404045406618876818882120215143139169164181This table is offered as a general guideline for filter selectionAll dimensions are nominal in millimetres unless specifiedAll dimensions are nominal in millimetres unless specified190MDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.ukMDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.uk191

Section 3.1Foreline trapsLiquid nitrogenRoughing componentsRoughing componentsSection 3.1Foreline trapsLiquid nitrogenUHV and HV seriesCFØ TubeATypØ Clamp89Trap Nom. Tube Body Body Clamp Wtsize cap. Flange dia. dia. height A B 00 kg100 .45 DN16CF 19 102 192 102 98 140 2.7100 .45 DN40CF 38 102 192 94 98 140 2.7150 1.59 DN40CF 38 152 261 119 145 190 5.2150 1.59 DN63CF 63 152 261 124 145 190 5.2200 4.13 DN63CF 63 203 286 149 159 244 10.5200 4.13 DN100CF 102 203 286 151 159 244 10.5ReferenceDFT-4075-2LNDFT-4150-2LNDFT-6150-2LNDFT-6250-2LNDFT-8250-2LNDFT-8400-2LNPartnumber434001434007434010434016434019434025£5104976357009551050€631690953105014331575RotatableflangeBBodyheightLiquid nitrogenreservoirFixedflangeISO KF and ISO LFFeaturesnnnnnTraps all types of condensable vapoursTwo-piece, clamped body for easy maintenance304 stainless steel trap bodyAluminium centring ring with Viton ® O-ringLow LN 2consumptionDescriptionLiquid nitrogen traps remove condensables before theyenter the pump or backstream from the pump to thevacuum system. Water trapping by the liquid nitrogencooled stainless steel surface is complete and permanent.Liquid nitrogen is added to the reservoir through a fill andvent tube at the top of the trap. A liquid level sensor froma customer- supplied controller can also be insertedthrough the tube. Reservoir capacities, given in litres, arelisted in the product tables.Liquid nitrogen consumption is largely dependent on thelevel of vacuum maintained in the roughing line. Otherfactors such as frequency of vacuum cycling, ambientrelative humidity and gas bleed also affect consumption.Regeneration is achieved by isolating the trap from thevacuum system and removing the band clamp to separatethe upper and lower body sections.CF PortsØ TubeISO and KF portsØ TubeATypATypØ BodyØ BodyØ ClampFill and vent tube19.1 OD x 17.3 IDØ ClampBB89Bodyheight89BodyheightHose connectionTrap Nom. Tube Body Body Clamp Wtsize cap. Flange dia. dia. height A B 00 kg100 .45 DN16KF 19.1 102 192 102 98 140 2.7100 .45 DN25KF 25.4 102 192 94 98 140 2.7100 .45 DN40KF 38.1 102 192 94 98 140 2.7150 1.59 DN40KF 38.1 152 261 120 146 191 5.9150 1.59 DN50KF 50.8 152 261 120 146 191 5.9150 1.59 DN63LF 63.5 152 261 121 146 191 5.9200 4.13 DN63LF 63.5 203 286 146 159 244 11.4200 4.13 DN100LF 101.6 203 286 146 159 244 11.4Trap Nom. Body Body Clamp Wtsize cap. Flange dia. height A B 00 kg100 .45 19.1 102 192 89 98 140 2.7100 .45 25.4 102 192 89 98 140 2.7100 .45 38.1 102 192 89 98 140 2.7150 1.59 38.1 152 261 114 146 191 5.9150 1.59 50.8 152 261 114 146 191 5.9150 1.59 63.5 152 261 114 146 191 5.9200 4.13 63.5 203 286 140 159 244 11.4200 4.13 101.6 203 286 140 159 244 11.4ReferenceKDFT-4075-2LNKDFT-4100-2LNKDFT-4150-2LNKDFT-6150-2LNKDFT-6200-2LNLDFT-6250-2LNLDFT-8250-2LNLDFT-8400-2LNReferenceDFT-4075-LNDFT-4100-LNDFT-4150-LNDFT-6150-LNDFT-6200-LNDFT-6250-LNDFT-8250-LNDFT-8400-LNPartnumber434002434005434008434011434014434017434020434026Partnumber434000434003434006434009434012434015434018434024£469473482586595661891691£454459464558563567797839€65165667081382691712361334€63163764477478178711061165Hose connectionØ BodyAll dimensions are nominal in millimetres unless specifiedAll dimensions are nominal in millimetres unless specified Weights given are approximate192MDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.ukMDC Vacuum Limited Telephone +44 (0)1825 280 450 www.mdcvacuum.co.uk193