Ar 215 8 Series High Pressure Deflagration Flame Arrestor
8 SeriesInstruction ManualMarch 20158 Series High Pressure DeflagrationFlame ArrestorTable of ContentsIntroduction. 1Specifications. 2Principle of Operation. 3Factors Affecting Flame Arrestor Performance . 4Installation. 5Maintenance. 7Recommended Spare Parts. 10Parts List. 10WarningFailure to follow these instructions orto properly install and maintain thisequipment could result in an explosion,fire and/or chemical contaminationcausing property damage and personalinjury or death.Enardo high pressure deflagration flamearrestors must be installed, operatedand maintained in accordance withfederal, state and local codes, rulesand regulations and Emerson ProcessManagement Regulator TechnologiesTulsa, LLC (Emerson ) instructions.Call a qualified service person to servicethe unit. Installation, operation andmaintenance procedures performedby unqualified person may resultin improper adjustment and unsafeoperation. Either condition may result inequipment damage or personal injury.Only a qualified person shall installor service the 8 Series high pressuredeflagration flame arrestor.IntroductionScope of the ManualThis manual provides specifications, installationand maintenance instructions and parts orderinginformation for the 8 Series high pressuredeflagration flame arrestor.Product Description8 Series high pressure deflagration flame arrestors isdesigned to protect equipment against high velocityand pressure flame fronts inherent in applicationsbeyond the performance range of a standard flamearrestor but not yet to the detonation phase of flamedevelopment and provide an economical alternativeto a detonation arrestor. The 8 Series high pressuredeflagration flame arrestor is designed to surpassstandard flame arrestors for applications thatinclude extended lengths of pipe with one bend,elevated operating pressures and extended flamestabilization on the flame cell element. The arrestorsare bi-directional and can stop low, medium and highD103831X012!Figure 1. 8 Series High Pressure Deflagration Flame ArrestorNorth America OnlyParts Ordering. 10www.enardo.com
8 SeriesSpecificationsThe Specifications table lists the specifications for the 8 Series high pressure deflagration flame arrestors.Specification is stamped on the nameplate attached to the flame arrestor.Available ConstructionSee Table 1 and Figure 2Temperature Rating of Gaskets(1)Fiber Gaskets (standard): 450 F / 232 C or higherGas GroupB, C and DPipe LengthSee Table 4Flange Size and Rating2 to 24 in. / 50 to 600 mmCL150 FF and RFHousing MaterialCarbon steel, 304 Stainless steel,316 Stainless steel, Hastelloy and ExoticHousing Size8 to 48 in. / 200 to 1200 mmCell Material304 Stainless steel, 316 Stainless steeland Hastelloy 8/--Deflagration terialElementMaterialE8 if eccentricconfiguration08 8 in.through48 48 in.02 2 in.through24 24 in.GasGroupC Carbon Steel4 304 SST6 316 SSTH Hastelloy E Exotic4 304 SST6 316 SSTH Hastelloy E ExoticBCDConnectionTypeF F lat faceflangeR RaisedfaceflangeOptions1 Drain Plug2 Pressure Tap3 TemperatureProbe Tap4 Miscellaneous5 Protective coating6 Special featureFigure 2. 8 Series High Pressure Deflagration Flame Arrestor Available Constructions and Model Numbering SystemHastelloy is a mark owned by Haynes International, Inc.2North America Only1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
8 SeriesFLAME STABILIZED ONARRESTOR ELEMENTFLAME ARRESTOR ELEMENT ABSORBSAND QUENCHES FLAME FRONTPIPINGEXPOSED SIDEPROTECTED SIDEFigure 3. Flame Arrestor OperationTable 1. 8 Series High Pressure Deflagration Flame Arrestor Available ConstructionFLANGE SIZEhousing 48508362020500369008482424600481200pressure deflagrations. Enardo utilizes a patented(US Patent No. 5415233) element assembly thatdampens the high velocities and pressures associatedwith deflagration and detonations while quenching theflame front.Designed with flanged connections, this arrestor allowsremoval of the flame cell element for easy cleaningand replacement without removing the arrestorbody from the pipe connection. Standard housingconstruction is carbon steel or stainless steel. Theelement is available in Stainless steel. Special materialand protective coating are available on request.North America OnlymodelPrinciple of OperationThe high-pressure deflagration flame arrestor isan enhanced version of the standard deflagrationflame arrestor, designed to stop flames in the low,medium, and high pressure deflagration states. Flamearrestor allows gas to pass though it but stops flamein order to prevent a larger fire of explosion. Arrestorprevents flame by absorbing and dissipating the heatfrom flame as it attempts to travel through the spiralwound crimped ribbon flame cells. These cells allowmaximum flow with maximum protection. See Figure 3.3
8 SeriesTable 2. Maximum Experimental Safe Gap (MESG)MESGNational Electric code (NEc)In.mmtest gas listGroup B0.0110.28HydrogenGroup C0.0260.65EthyleneGroup D0.0350.90PropaneG.M.0.0441.12MethaneTable 3. 8 Series High Pressure Deflagration Flame Arrestor Endurance Burn TimeHigh Pressure Deflagration Flame Arrestors - all sizesMaximum Initial PressurepsiakPaD19.713615 MinutesC16.711515 MinutesB16.71155 MinutesFactors Affecting FlameArrestor PerformanceGas GroupMaximum Experimental Safe Gap(MESG)!!WarningMethanol is classified by the NationalElectrical Code (NEC) as a Group-Dvapor. However, our lab tests indicatethat methanol exhibits characteristicsunlike other Group-D vapors undercertain conditions. We thereforerecommend that an arrestor ratedfor Group-C vapors be specified formethanol service.The type of gas in the system determines its gasgrouping and therefore predetermines the type ofarrestor element required. The element must bedesigned to accommodate the specific gas group thatcould possibly ignite and propagate in the system. Themore explosive gases require the flame cell to absorbthe heat more quickly and efficiently. The NationalElectrical Code (NEC) groups gases into A, B, C, Dand G.M. categories depending on the MaximumExperimental Safe Gap (MESG) of the gas.4Endurance Burn TimeWarningVerify that the high pressure deflagrationflame arrestor being installed has theappropriate gas group rating for yourprocess. This information is shown onthe nameplate attached to the elementhousing. Do not remove or alterthis nameplate.The measurement of the maximum gap between twoequatorial flanges on a metal sphere that will preventa flame from being transmitted from the sphere to thesurrounding flammable mixture. MESG is dependenton gas composition. The stochiometric mixture (theideal air/fuel ratio for the most efficient combustion)is used to determine the minimum MESG for agiven gas. See Table 2 for the MESG per gas group.North America OnlyGas Group
8 SeriesTable 4. 8 Series High Pressure Deflagration Flame Arrestor, For All Sizes Pipe Length RulesGas Group “B”Gas Group “C”Gas Group “D”15 ft. / 4.5 m.35 ft. / 10.6 m.60 ft. / 18 m.Maximum Initial Operating PressureThis is the pressure of the system at or near staticflow conditions. High pressure deflagration can occurmore easily at higher system operating pressures thanat pressures near atmospheric. Elevated pressurescondense the ignitable gas giving the flame morematter and energy to release thereby boosting theflame heat intensity.Endurance Burn Time!WarningUnlimited burning should not be allowedin any flame arrestor, regardless ofits burn time rating. If burning canoccur for a period exceeding 2 minutesstarting at ambient temperature, it isrecommended that a temperature alarmand shutdown system be installed. AllEnardo High Pressure DeflagrationFlame Arrestors are provided withtemperature probe taps for this purpose.Endurance burn time is the time it takes for a stabilizedflame, at greatest heat saturation conditions, toheat the arrestor element above the auto-ignitiontemperature of the process gas stream resulting inflame propagation through the arrestor. See Table 3 forthe endurance burn time of each gas group.Pipe LengthsExtended lengths of pipe allow the flame to advanceinto more severe states of flame propagation suchas high pressure deflagration or detonations. Highpressure deflagration flame arrestors should beinstalled in accordance with Table 4.Bends and/or Flow ObstructionscautionFor maximum safety, avoid bendsand flow obstructions within 10 pipediameters on the protected side of theflame arrestor.Bends in piping, pipe expansions and/or contractions,valves, orifice plates or flow obstructing devices ofany kind contribute to turbulent flow. Turbulent flowenhances mixing of the combustible gases, greatlyincreasing the combustion intensity. This can result inincreased flame speeds, higher flame temperaturesand higher flame front pressures than would occur innormal flow conditions.North America OnlyMaximum length of pipe betweenthe flame arrestor and the ignitionsource with a maximum of one 90 bend. Multiple bends or any additionalobstructions are not recommended.Installation!WarningAlways make sure that the system isat atmospheric pressure and there isno ignitable gas that could flash wheneither installing or maintaining the unit.ConnectionEnardo high pressure deflagration flame arrestorsare normally provided with CL150 raised or flat faceflanges. Other flange such as CL300 are availableupon request. Make sure the companion flangesinstalled in adjacent piping match the flanges on thehigh pressure deflagration flame arrestors.5
8 SeriesPositioningcautionThe high pressure deflagrationflame arrestor is fitted with lugs forlifting the element assembly duringservicing operations. These lugs arenot intended for lifting the entire unitduring installation. Damage to the highpressure deflagration flame arrestor mayresult from improper lifting. The unitsshould be lifted using appropriatelyrated Nylon (PA) straps rigged on theoutside of the tension studs.The arrestor should be positioned such that theelement is accessible for removal. The tension studsare supplied with jacking nuts on one half of the boltingcircumference. Install the unit so that the jacking nuts(on the inside of the studs) are positioned on theopposite side from the direction that the elementassembly will be removed.Models that have drain plugs are designed forhorizontal installation and should be installed with thedrain plugs aligned at the bottom of the unit. Modelsthat have pressure taps are designed to allow pressuregauges to be installed on both sides of the flame cellassembly to determine blockage. The pressure tapsshould be aligned at the top to allow easy viewingof the gauges. Units that are equipped with optionalinternal cleaning systems should be connected to asource of cleaning media such as water, steam orother suitable solvent.Flow DirectionThe Enardo high pressure deflagration flame arrestoris bi-directional and can be installed either vertically orhorizontally. Consideration should be given to nonsymmetrical assemblies that include features such6as clean-out ports, temperature monitoring device orother options that might have a preferred installationdirection to suit the needs of the customer.Piping Expansions and ReductionsAdjacent to High Pressure DeflagrationFlame Arrestors!WarningNo instrument, tubing or other devicewhatsoever shall circumvent the highpressure deflagration flame arrestorin such a manner to allow a flame pathto exist around the flame element ofthe arrestor. When instrumentation isinstalled in such a manner that it createsa path circumventing the flame elementof an arrestor, measures must be takento prevent passage of flame through theinstrumentation device and/or system.Instrumentation must be capableof withstanding the maximum andminimum pressures and temperatures towhich the device may be exposed and ata minimum be capable of withstandinga hydrostatic pressure test of 350 psig /24 bar.An Enardo high pressure deflagration flame arrestormay be installed in any vapor control line that issmaller than or equal to the nominal pipe diameter ofthe arrestor’s connection flanges.When it is necessary to increase the diameter of thepiping on the downstream side of the high pressuredeflagration flame arrestor, a length of pipe at least120 pipe diameters must be installed between thehigh pressure deflagration flame arrestor and theexpansion. A pipe diameter is considered as theinside diameter of pipe having a nominal size equalto the high pressure deflagration flame arrestor’sconnecting flanges.North America OnlyStandard compressed fiber gaskets that willwithstand temperatures of 450 F / 232 C or higherare normally used, but other materials of equal orhigher temperature capability may be used at thecustomer’s discretion.
8 Series!WarningFlame cells must be inspected fordamage immediately following adeflagration and/or stabilized burn.1. Carefully remove the element assembly fromthe arrestor and place it on a soft surface suchas plywood.2. Inspect the flame cell visually for any signs ofcorrosion or other damage.3. Inspect the flame cell with a calibrated pin gaugeto ensure maximum crimp size openings do notexceed the following values for their respectivegas group: Explosion Group D – 0.062 in. / 1.57 mm Explosion Group C – 0.038 in. / 0.965 mm Explosion Group B – 0.017 in. / 0.432 mm4. If any damage is noted, or crimp openingsexceed maximum size allowable, replace theelement assembly.5. Keep the element openings clean to preventloss of efficiency in absorbing heat. Remove theelement assembly and clean the elements toprevent the openings from becoming cloggedwith particulate matter. Clean the element with asuitable cleaning media (solvent, soap, water, orsteam) then blow dry using compressed air. Becareful not to damage or dent the cell openingsas this would hamper the effectiveness of the unit.Do not clean the arrestor elements by rodding toremove blockages, as this practice will damagethe elements and seriously impair the arrestor’sperformance. If the arrestor element cannot becleaned satisfactorily, replace it.6. For best cleaning results, use a high pressuresprayer with spray wand (1500 to 3000 psig /103 to 207 bar) to clean the entire elementsurface. Hold the spray nozzle perpendicularto the surface being cleaned to maximize spraymedia penetration into the element. Alternatelyspray each side of the element surface until clean.7. The cleaning interval should be governed by theamount and type of particulate in the system towhich it is installed and must be determined bythe user. To determine the maintenance intervalthe user should check the element in the first fewmonths of operation to find how quickly particulateaccumulates in the cells.8. After cleaning, thoroughly inspect the element fordamage. If damaged, replace it.NoteUnder no circumstance should theelement bank be disassembled from itsshell for cleaning or replacement. Theelement section must be replaced as acomplete assembly.Cleaning of units equipped with thissystem may be accomplished in severalways including periodic cleaning usingmanually operated valves, by use ofan automated cycle timing method,or by having the cleaning operationinitiated whenever the pressure lossacross the arrestor element exceeds apredetermined value.North America OnlyMaintenanceElement Assembly, Disassembly andReassembly Instructions!WarningIsolate gas supply and bring systemto atmospheric pressure to preventignitable gas from flashing whileperforming maintenance.1. Loosen all jacking (inside) nuts on tension studsbetween conical sections of the flame arrestor.2. Tighten the inside jacking nuts on the tensionstuds forcing the two conical sections apart. Whenthe two flange faces have separated, remove thetension studs that do not have inside jacking nuts,so that the element assembly can be removed.The inside jacking nuts are installed on all tensionstuds that facilitate jacking the unit apart. Theinside jacking nuts are not installed on tensionstuds that are taken out, for ease of removal.7
8 SeriesPATTERN 2PATTERN 5PATTERN 3PATTERN 4PATTERN 6North America OnlyPATTERN 1PATTERN 7Figure 4. Flange Pattern Tightening SequenceTable 5. Tightening Steps and Torque Values(1)(2)TIGHTENING STEPS AND TORQUE (lbf-ft / N m)ModelPattern(2)Bolt size, In.Step 1Step 2Step 380802, 80803, 8080413/4-10Snug20 / 2745 / 618120627/8-9Snug25 / 3450 / 688160821-8Snug25 / 3450 / 6875 / 1028201031-1/4-8Snug35 / 4770 / 95120 / 1638241241-1/4-8Snug35 / 4770 / 95120 / 1638281451-1/4-8Snug35 / 4770 / 95120 / 1638301661-1/4-8Snug35 / 4770 / 95120 / 1638362071-1/2-8Snug50 / 68120 / 163170 / 2301. Using machine oil as lubricant. See Bolt Lubrication section on page 9 and torque correction factors for other lubricants in Table 6.2. See Figure 4.8Step 4
8 SeriesTable 6. Torque Correction Factors for Common LubricantsDEscriptionCOEFFICIENT OF FRICTIONMULTIPLY TORQUE VALUE IN Table 5 BYMachine Oilf 0.151.00API SA2 Greasef 0.120.80Never-Seez (Ni base)f 0.110.73Never-Seez (Cu base)f 0.100.67Molykote G-n Pastef 0.060.40cautionElement assemblies are heavy and willrequire the use of adequate equipmentand manpower to prevent injury.3. Thoroughly clean the gasket sealing faces beingcareful not to damage the sealing surface. Forreassembly, lightly grease one side of a newgasket and place it in the machined recess of eachinterior flange on the two conical sections.4. Replace the flame element assembly with a newassembly or properly cleaned and inspectedexisting unit.5. Loosen the jacking nuts on the tension rods untilthe flame cell assembly seats onto the gaskets.6. Replace all tensioning studs and hand tighten theouter nuts. Check to be sure that all the jackingnuts are completely loose and not making contactwith the flange face.7. Torque the bolts in sequence as shown inTorquing Instruction.Torquing InstructioncautionExcessive or uneven torquing cancause permanent damage to gasketsand housing.Tools/Supplies Required Hand operated conventional torque wrench orpower assisted torque wrench appropriate for thespecified torque. Socket wrenches of the proper size to fit the hexnuts being tightened Molydisulfide based lubricating paste,Molykote G-n or equivalent Brush suitable for applying lubricant to the studs Wiping rags necessary for the clean up ofexcessive lubricantProcedureNorth America Only 1. Use studs and nuts that are free of visiblecontamination and corrosion.2. Apply lubricant to the threads of the studprotruding outboard of the interior flanges andto the face of the hex nuts which will contactthe flange.3. Assemble the nuts to the studs such that theamount of thread extending outboard beyond thenut is approximately equal on both ends.4. Tighten the nuts to the torque values shownin Table 5 following the designated sequence,repeating the sequence as shown. Flange patterntightening sequences are shown in Figure 4.Bolt LubricationLubrication will affect required torque of cleanfasteners in good condition more than any other factor.In fact, 90% of applied torque goes to overcomefriction while only 10% actually stretches the bolt.Table 5 assumes that only machine oil is used as alubricant. Table 6 shows a list of several commonlubricants and their effect on torque required to stretchbolts to 50% of their yield strength. Most are availablefrom local bearing distributors.Molykote G-n is a mark owned by Dow Corning Corporation.Never-Seez is a mark owned by Bostik, Inc.9
8 SeriesRecommended Spare PartsParts OrderingFor installations that require frequent maintenance andminimum downtime it is recommended that the userpurchase a spare element assembly and several spareelement gaskets. The spare element assembly canbe installed immediately and the dirty assembly canthen be cleaned and be stored as a spare for the nextmaintenance interval.When corresponding with your local Sales Office aboutthis equipment, always reference the equipment serialnumber stamped on the nameplate.When ordering replacement parts, specify thecomplete 7-character part number of each requiredpart as found in the following parts list.NoteParts ListTable 7. Part Numbers for Replacement Element Assembly Gaskets(1)PART NUMBERModelStandard Gasket(Compressed Fiber)High Temperature Gasket(Graphite Base)80802, 80803, 171. Two (2) required per assembly.10North America OnlyElement gaskets should be replacedeach time the cell assembly is loosenedand removed to insure a gas tight seal.
8 SeriesTable 8. Replacement Element Assemblies Part Numbers (Group D Gas)Housing MaterialCarbon Steel304 Stainless SteelCarbon SteelFlame Cell Material304 Stainless Steel304 Stainless Steel316 Stainless SteelPart Number80802, 80803, 08000919North America OnlyModel11
North America Only8 SeriesEmerson Process ManagementRegulator Technologies Tulsa, LLC9932 East 58th StreetTulsa, OK 74146-6411Tel: 1 918 662 6161Fax: 1 918 662 0004For further information visit www.enardo.comThe Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Enardo is a mark owned by Regulator Technologies Tulsa, LLC,a business of Emerson Process Management.The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties orguarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of suchproducts at any time without notice.Emerson Process Management Regulator Technologies Tulsa, LLC does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, useand maintenance of any Emerson Process Management Regulator Technologies Tulsa, LLC product remains solely with the purchaser. Emerson Process Management Regulator Technologies Tulsa, LLC, 2015, Rev. F; All Rights Reserved
flame arrestor, designed to stop flames in the low, medium, and high pressure deflagration states. Flame . The Enardo high pressure deflagration flame arrestor is bi-directional and can be installed either vertical
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