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1 HELICOFLEX High performance sealingET 512E0130 GarlockSealing TechnologiesGENERAL CHARACTERISTICSFOREWORDHELICOFLEX SEALING CONCEPTINTRODUCTION OF HELICOFLEX SEALHigh performance sealing HELICOFLEX The HELICOFLEX seal has been created with the technical collaboration of the French Atomic Energy Commission (CEA).Itis an elastic metallicseal which results from a long experimentation and which has proved its efficiency in many fieldsfrom research to industry. Its basic concept (sealing lining + spring)allows, through the technical knowledge of Cefilac, to adjust the characteristics and the shapes of the seal to your assembly and to meet the sealing sealing concept of the HELICOFLEX sealis based on viscoplastic deformationof a metallic lining.

2 This lining is selectedbased on its plasticity, which has to bebetter than the flange material deformation is obtained by compressing a helicoidal spring. The spring gives to the HELICOFLEX seal its choice of the spring characteristicsallows: to adjust compression load basedon type of lining material andrequired sealing level. to control the load needed to ensure a permanent contact between the use of a helicoidal spring with joinedcoils as the elastic core ensures, thanks tothe individual action of each coil, anoutstanding level of adaptability to flangegeometry and defects. DN 4 to 8000 mm 1,5 to 40 mm cross section Sealing level from bubble tightness up to 10-12Pa Temperature from -272 up to 800 C Pressure from 10-10mbar up to 3000 bar Very good resistance to radiation Very good resistance to corrosion Extended life time Adaptable to all types of sealing surfaces(FF, RF, TG, Groove.)

3 (3 faces, radial, shaped, ..) Adaptable to all flange standards (PNEUROP, ANSI, ISO, ..)2 PlasticityResiliencyAllmetal)BEFORE TIGHTENINGAFTER TIGHTENINGHNHLHELICODURHLHELICODURD ouble tore mixteDouble torem talliqueHNHNDEC omposite double sectionHNDEHNHNDD ouble torem talliqueHNDHNHNHNMETAL TO METAL ASSEMBLYHigh performance sealing HELICOFLEX CONTROL OF THE COMPRESSIONThe metal/metal assembly consists in generating a solid mechanical contact independent of the active part of the seal. The seal elasticity is completely dedicated to maintaining the sealing. This concept protects the seal from Optimized compression Minimum elastic deformationrequired Rigid assembly Excellent withstanding of thermal transientsADVANTAGES OF THEMETAL/METAL CONTACTAACBBBThe HELICOFLEX seal requires, in case of a static sealing application, controlled compression either by means of a groove or by means of a built-in compression limiter.

4 In case of a semi-static application, it requires a controlled seating load .Before tighteningAfter tighteningACBC ontrolledloadHELICOFLEXHN- Used in most cases with single or double lining Single or double the various types or shapes mentioned in pages 8 seal section is oval andallows its use in trapezoidal groove in place of RTJ gasketsHas an internal limiter to controlthe compressionUsed in a non metal to metalassembly Accepts a retighteningThe grinding of the spring accor-ding to an angle perfectlygives the possibility to modulatethe seal tightnesswire sectionParticular shape of the sealresulting in a lower point forinitial sealing level Yoas wellas for sealing point 4 HELICOFLEX SEAL ADAPTABLE TO EVERY APPLICATIONHigh performance sealing HELICOFLEX ADAPTABILITY BY THE SEAL GEOMETRYBASIC VERSION

5 Standard circularCross Section ( )ADAPTABILITY BY THE MATERIAL CHOICEADAPTABILITY BY THE DESIGN FLEXIBILITYADAPTABILITY TO THE APPLICATIONGROOVETONGUE & GROOVERAISED FACES ealing lining : Aluminum - Gold - Silver - Iron - Copper - Brass - Soft steel - Nickel - Monel - Tantalum - Stainless steel(304L - 316L - 321 - 316 Ti) - Zirconium - Inconel (600 - 625) - Hastelloy - : Music wire XC80 - (High Temperature Alloy).But also : for Pneurop flanges, for conical flanges, remote handling, for SectionDouble HELICOFLEX SectionSeal with spacerSeal with leak checkVer y large sealSeal with ribSeal with clipShaped sealoblong, squarewith PTFE coatingRADIALCONICAL FLANGE3 FACES CONTACTPUPPET VALVEBUTTERFLY VALVELEAK FIELDSHigh performance sealing HELICOFLEX RESEARCHSPACEHELICOFLEX NUCLEAR (NPP)CRYOGENICSSEMI-CONDUCTORSTRANSPORTC HEMICAL/PETROCHEMICALULTRA HIGH VACUUMNUCLEAR (Fuel)AUTOMOTIVEFLATNESS TOLERANCET hanks to its spring concept, the HELICOFLEX seal accepts flatnessdefects.

6 The following flatness tolerances can be acceptable onthe flange assembly (cumulated value for both flanges). A localdefect could generate a lack of compression that shall notexceed 20% of the nominal CRITERIAThe characteristic values given in this catalog are designed to meet 2 distinct sealing criteria : The bubble tight sealing corresponding to a gaseousflow of air ( ) under 1 bar P. The Helium sealing corresponding to a gaseous flow ofHelium ( ) under 1 bar lower gas flow ( ) can be achieved according to the choice of the lining, but that requires asuper polishing of the seal and of the sealing choice of sealing criteria according to the differentassembly requirements (gas sealing, liquid sealing, toxicity,pollution, ..) must be done before designing the assemblydue to the consequences of this choice on the FINISHThe sealing level of the HELICOFLEX seal is directly and closely related to the quality of the surface finish of thesealing areas.

7 The sealing surface finish is critical fromboth roughness and method of machining finishes have to be recommended for circular seals ;milling should be avoided. The below table summarizes these recommendations. Circular seals for use on turned surfaceNote : The sealing areas must be turned by lathe. It is not recommended to try to get the required roughness bypolishing with abrasive paper. This process must be reservedfor refurbishing damaged sealing surface. This polishing hasto be done in the same circular way as machining by lathe. SHAPE SEALS (rectangular, oblong, ..) FORUSE ON MACHINED SURFACEThe surfaces, using shape seals, are obtained with processesless favorable to the sealing performance than lathe machi-ning. By consequence, the seal requires a design, comparedto the circular seal, with a stiffer spring.

8 For non circularseals, the sealing surface finish has to be better whatever thelining (Ra = 0,4 0,8 m). In case the roughness can not beobtained, a specific tool generating preferential polishinglines can be LCA - CEAN10N9N8N7N6N5N4Ra in m12,56,33,21,60,80,40,2Rt in m503721116,23,41,9 . inches5002501256332168 Plating (Pb, Sn, In)PTFE - FEPA luminumSilver, copper, ironNickel, stainless steelnot recommended(please consult us)correct valuesacceptablecorrect valuesrecommended Average value to adjust according to the cross *tangential*sloperadial*slope0,2 mm0,1/1001/1000,4 mm0,2/1002/1000,8 mm0,5/1003/100DN 10 to 500DN 500 to 2000DN 2000 to 5000 GUIDELINE FOR USING & DIMENSIONINGHigh performance sealing HELICOFLEX 6 LOAD VERSUS DEFLECTION CURVEece2emYme1Y1Y0Y2e0 Linear load ( )Permanent deformationUseful elastic recoverydeflectionmmcompressiondecompres sionPRESSURE/TEMPERATURE (MPa)

9 CHARACTERISTIC VALUESHigh performance sealing HELICOFLEX 7 The compression and decompression cycle of the HELICOFLEX seal shows a progressive flattening of the curve. The position ofthis step is selected according to the required sealing and the lining TO TAKE INTO ACCOUNT FOR THE HELICOFLEX CALCULATION (page 9)Refer to tables, page 8, for standard seals and page 12 for HELICOFLEX delta us for all other specific seals ( HELICOFLEX beta HNR, shape seals, Omicron, ..)The Y2, e2, ec, Y1values are directly readable in the values (Puet Pu ) allow to linearly interpolate Pu with a safety calculated with P, Pu , Y1, Y2(see page 9).Y0=Y2=e2=ec=Ym(1)=em(1)=(1)Linear load from where the requiredsealing level is load to reach the seating pointand the metal to metal value to get the metal tometal contact.

10 It is related to the linearload Y2and determines the compression value beyond whichthe sealing level could linear load to maintain sealingin service. It varies according to thepressure and the temperatureCompression values related to Ymbelowwhich the sealing level is of P & =Pu 20 =Pu = maxi =Maximum pressure : it is the maximumpressure that the seal can withstand at a certain pressure at room temperature (20 C)Maximum pressure at service value allows the where Pu is closed to : YmforT = 20 C &P= 1 bar is named Y1, and emise1 Lining :ALUMINUM GOLD1,6 (1,6 1,8)0,6 0,050,71502050-902035-1502 (1,9 2,1)0,7 0,10,851602052-1002040-1502,2 (2,2 2,4)0,7 0,10,91652053-1052040-1802,6 (2,5 2,9)0,7 0,10,917520555115204252203 (3 3,4)0,8 0,111852555101302045102503,5 (3,5 3,9)0,8 0,111902555141402047142504 (4 4,4)0,9 0,11,12002560171502050172804,5 (4,5 4,9)0,9 0,11,22102560201602052202805,1 (5 5,4)0,9 0,11,42203063221702555223005,6 (5,5 5,9)0,9 0,11,62303065241802557243206,6 (6 6,9)1 0,11,82453567251953060253407,6 (7 7,9)1 0,12,22704070282053565283408,6 (8 8,9)1 0,12,62905072322254068313609,8 (9 9,9)1 0,1332555753323550723238010,8 (10 10,9)