Gasket Design Criteria
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FLEXITALLIC GASKET DESIGN CRITERIA Worldwide Customer Service Network 2 Section I - Gasket Selection 4 PTFE Products - Sigma® _ 10 PTFE Products - Fluoroseal _ 12 Compressed Fibre Gasket 14 Sheet Materials Chemical Compatibility Chart 16 Metal Jacketed Gasket _ 20 Spiral Wound Gasket _ 23 Sizing of Spiral Wound Gaskets 31 Metal Reinforced Gasket (MRG) _ 34 Flange Rescue Gasket (FRG) 34 Ring Type Joint (RTJ) 35 Specialised Ring Type Joint 37 Section II - Joint Integrity Calculations 40 ASME Boiler & Pressure Vessel Code Calculations 41 Section III - Gasket Installation _ 47 Bolt Torque...

WOrLDWIDE CUSTOMEr SErVICE NETWOrk Innovative Product range We have a rich history of innovation, which has seen us lead the industry with many new products. Over the years, our products have gained a reputation for quality, reliability and technology that is second to none. Customised Engineering Solutions Our Application Engineering, Production Engineering and R&D teams work closely together to design, develop and manufacture bespoke sealing solutions. We have been responsible for a number of truly revolutionary products, including Thermiculite®, Sigma® and the Flange Rescue Gasket, which...

FLEXITALLIC GASkET DESIGN CrITErIA Introduction Flexitallic, the world’s leading manufacturer and supplier of static seals and the originator of the Spiral Wound Gasket, is committed to sealing solutions for today’s industry. With greater emphasis than ever before placed on joint tightness, more attention is focused toward variables associated with the integrity of the bolted gasketed joint. Flexitallic Gasket Design Criteria manual offers the engineer and end user assistance in meeting the goal of providing fundamentally sound static sealing practice. Developed and collated by...

SECTION I Gasket Selection Gaskets can be classified into three categories: soft cut, semi-metallic and metallic types. The physical properties and performance of a gasket will vary extensively, depending on the type of gasket selected and the materials from which it is manufactured. Physical properties are important factors when considering gasket design and the primary selection of a gasket type is based on the following: • Temperature of the media to be contained • Pressure of the media to be contained • Corrosive nature of the application • Criticality of the application Soft Cut Sheet...

Gasket Selection Critical Service RTJ type flange or > Class 600 Yes Critical Service Flange intended for RTJ type Use SWG, FlexproTM, or Weld Ring Use SWG, FlexproTM, or Weld Ring Use SWG, FlexproTM, MRG, Weld Ring, Thermiculite® 815, or ST/RGS3 Use LS, SWG, FlexproTM, MRG, or Weld Ring Select sealing material and metal type (when appropriate) on basis of service, temperature, and nature of medium. Soft cut gaskets should always be of the minimum thickness consistent with the style of the flanges to be sealed, and compatible with the medium. For more information visit www.flexitallic.eu...

Soft Cut Gaskets With the shift to soft cut gaskets, gasket manufacturers have developed a myriad of products. Some of the initial materials developed proved inferior to their predecessors in regard to temperature, chemical resistance, creep resistance and sealing characteristics. Flexitallic has developed a wide range of compressed fibre gasket sheet products. Some of these products have been fibre reinforced grades, manufactured by the traditional calendering or sheeter process. Other product ranges are fibre-free and some of these materials have exceptionally good properties. Flexitallic...

Thermiculite® Exclusive to Flexitallic, this revolutionary material comprised of chemically and thermally exfoliated vermiculite simulates the structure of exfoliated graphite, with one notable exception – it maintains integrity through a wide range of extreme temperatures. Vermiculite’s thin, flexible, soft plates can be exfoliated like graphite. They retain the sealability and low porosity of graphite, but unlike graphite, Flexitallic’s Thermiculite® sheet materials will not oxidise at high temperatures. Graphite’s stress-loss due to oxidation has led to many examples of gasket failure....

Thermiculite® Critical Service Series – Thermiculite® 815 High temperature sheet reinforced with a 0.004” 316 stainless steel tanged core. Available in thicknesses of 1/32”, 1/16”, and 1/8” in meter by meter (standard) and 60” x 60” sheet. Cut gaskets are available in all shapes and sizes. Time Since Start of Test (days) 100 Each specimen held successively for 3 days at each temperature and the change of weight recorded Cumulative Weight Loss (%) BEST EXFOLIATED GRAPHITE TESTED WORST EXFOLIATED GRAPHITE TESTED Thermiculite® 815 is the original grade developed in the entire range of...

Thermiculite® Sheet Property Summary Thermiculite® 715 Light Brown Golden Brown Material Description Type Colour Properties Thickness ASTM F152 Cross Grain Tensile Strength ASTM F38 B Creep relaxation 1/32” ASTM F37 Liquid Leakage Fuel A 10 psi, Stress 1000 psi ASTM F146 Thickness Increase IrM 903 ASTM F146 Thickness Increase Fuel B ASTM F146 Weight Increase IrM 903 ASTM F146 Weight Increase Fuel B Gasket Constants ASME m ASME Y Temperature and pressure guides cannot be used simultaneously and do not apply to all thicknesses. In keeping with Industry norms, Flexitallic suggests that cut...

PTFE Products – Sigma® Flexitallic Sigma® offers outstanding chemical resistance while the unique manufacturing process results in a biaxially fibrillated structure ensuring high seal integrity in the most demanding applications. While conventional PTFE-based sealing materials have long been the choice for superb chemical resistance, they are not ideally suited to achieve the maximum reduction of creep relaxation, or cold flow, in situations where seal integrity is paramount. Utilising a unique manufacturing process exclusive to Flexitallic, we created SIGMA®, an innovatively-engineered...