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(psi)StressGasket STYLE LSTM & LSI LOW STRESS RANGE OF SPIRAL WOUND GASKETS The LS gasket offers the same high integrity seal associated with the Color coded and stamped centering ring for easy +++ � spiral wound gasket+++however, the LS and LSI has been designed in product identification such a way that compression and sealing requirements are achieved Spiral wound design under very low seating stresses. These gaskets are intended for use significantly reduces � gasket creep on class 150 and 300 applications,++where customers traditionally + do not use spiral wound gaskets++due to concerns about exceeding Metallic inner ring + contains and protects + � allowable design stresses. sealing elements TRADITIONAL VS. "LSI" and "LS" ++ Traditional Spiral Wound Gasket with Inner Ring �Temperature(F) "LSI" Gasket PTFE Filler provides excellent � chemical resistance. Also available with ThermiculiteTM or a combination of both. Low Stress construction � seals at sheet gasket torques "LS" Gasket Patent #5161807/5275423 Metallic centering ring � provides blowout resistance and compression stop The traditional spiral wound gasket has its steel windings protruding above the compression stop; this requires a significant loading stress to compress the gasket to its optimum operating thickness. The LS and LSI gaskets have only soft Flexicarb or PTFE filler LOWER BOLT STRESS-REDUCED FUGITIVE EMISSIONS protruding above metal windings and guide ring; therefore as the gasket is compressed, the Flexicarb�,ThermiculiteTM 836, or PTFE Flexitallic recommended minimum bolt torque figures filler is readily compressed thus producing the sealing mechanism for use with the "LSI" gasket on ASME/B16.5 flanges.* at an earlier stage as compared to the conventionally manufactured NPS (Ins) TORQUE FT.LBS. NPS (Ins) TORQUE FT.LBS. spiral-wound gasket. 1/2 25 5 83 FLEXITALLIC "LSI" vs. PTFE Sheet 3/4 25 6 83 5000 + ++ 700 1 25 8 83 4000 600 1 1/4 25 10 133 + + + 500 ++ 1 1/2 25 12 133 3000 + 400 + 1/16" PTFE Sheet 2 50 14 204 Temperature 2000 300 + "LSI" Gasket + + 200 2 1/2 50 16 204 ++ + 1000 +++++ 100 3 50 18 296 0 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 3 1/2 50 20 296 Elapsed Test Time (hours) 4 50 24 417 The "LSI" gasket retains more of its initial stress or tightness, evenNote: Minimum required torques may be even lower when subjected to high temperatures, unlike PTFE sheet gaskets. depending on gasket size and bolt material. Please contact Flexitallic's Technical Services Department AVAILABLE IN A VARIETY OF METALS, for more information. ENGINEERED TO SUIT SPECIFIC APPLICATIONS. *Above torque values are for class 150 ASME flanges TORQUE VALVES FOR 300 # AVAILABLE ON REQUEST. 34
Goodyear Rubber Products
