한국매스타이트㈜

한국매스타이트㈜ WHAT IS MASTITE NON-ASBESTOS ?

한국매스타이트㈜ WHAT IS MASTITE NON-ASBESTOS ? MASTITE NON-ASBESTOS ARE MATERIALS THAT HAVE BEEN SPECIALLY DEVELOPED TO COMBAT THE DANGERS OF ASBESTOSIS

한국매스타이트㈜ PLEASE LET ME INTRODUCE MYSELF MY NAME IS MR. MASTITE I WILL BE TALKING TO YOU ABOUT: HEALTH & SAFETY ASBESTOS ‘V’ NON-ASBESTOS MATERIAL PROPERTIES

한국매스타이트㈜ DID YOU KNOW

한국매스타이트㈜ DID YOU KNOW

한국매스타이트㈜ ALSO

한국매스타이트㈜ AND

한국매스타이트㈜

한국매스타이트㈜ WHAT ARE THE DIFFERENCES BETWEEN ASBESTOS AND NON-ASBESTOS

한국매스타이트㈜ WHAT ARE THE DIFFERENCES BETWEEN ASBESTOS AND NON-ASBESTOS GOOD QUESTION

한국매스타이트㈜ ASBESTOS NON- ASBESTOS TEMPERATURE: approx.500 apprx.300 FIBRE CONTENT up to 70% up to 40% COMPRESSION approx.10% approx. 15% SAFETY DANGEROUS safer alternative COST appox. X 2

한국매스타이트㈜ Non-Asbestos There is no one fibre that can replace the asbestos fibre at present. Most manufacturers use a combination of: Aramid, Glass, Mineral and Carbon. It is also know that there are many more compositions used when producing Non-asbestos sheeting than when producing asbestos.

한국매스타이트㈜ WHAT PROPERTIES MAKE A GOOD SEAL ?

한국매스타이트㈜ TYPICAL FLANGE JOINT Sealing Properties required : Good compression Low creep Temperature resistance Chemical resistance Low permeability Recovery

한국매스타이트㈜ FLANGE JOINT SECTION External Pressure (Bolt Torque ) Internal Pressure. Resistance to Fluid or Gas being handled. Resilience to Flange Movement IDEAL GASKET: High Compressibility with a low creep factor giving good resistance to temperature & chemicals/gases. It is always better to have the thinnest gasket possible however consideration of flange smoothness & distortion should be made when calculating the Gasket thickness. K.M.G. 한국매스타이트㈜

한국매스타이트㈜ POSSIBLE LEAK PATHS Permeability through the Material Irregularities of the Flange surface & flange distortion. Giving rise to possible leakage

한국매스타이트㈜ GUIDE TO CALCULATING GASKET THICKNESS Measure surface finish & flange distortion. Take the greater of the two = x ASBESTOS Typical compression value of Asbestos 9%=y NON-ASBESTOS Typical compression value of Non-Asbestos 13%=y X Times 2 x 100 y Gasket Thickness Eg. Asbestos x 2 x100 y(9) 3mm Eg. Non-Asbestos x 2 x100 y(13) 2mm

한국매스타이트㈜ GASKET CREEP Gasket creep occurs when external stress(pressure) and temperature is applied to the gasket. The effect of gasket creep is a thickness decrease in the gasket material coupled with the gasket spreading into the inner flange & the outer. In extreme cases gasket creep can result in a complete breakdown of the material. External Pressure (Bolt Torque ) External Pressure (Bolt Torque )

한국매스타이트㈜ GASKET CREEP Gasket creep occurs when external stress(pressure) and temperature is applied to the gasket. The effect of gasket creep is a thickness decrease in the gasket material coupled with the gasket spreading into the inner flange & the outer. In extreme cases gasket creep can result in a complete breakdown of the material. External Pressure & temperature cause gasket thickness decrease & creep External Pressure (Bolt Torque ) External Pressure (Bolt Torque )

한국매스타이트㈜ GASKET CREEP Gasket creep occurs when external stress(pressure) and temperature is applied to the gasket. The effect of gasket creep is a thickness decrease in the gasket material coupled with the gasket spreading into the inner flange & the outer. In extreme cases gasket creep can result in a complete breakdown of the material. External Pressure (Bolt Torque ) This then reduces the external downward pressure creating potential leak paths External Pressure (Bolt Torque )

한국매스타이트㈜ GASKET CREEP Generally the higher the compressibility of a material the better the initial sealing properties. However high compressibility can sometimes give high levels of GASKET CREEP which will cause the gasket to leak or in some cases fail completely. So far we can conclude that material with good compressibility and low creep is desirable. GOOD COMPRESSIBILITY & LOW CREEP = GOOD SEALABILITY

한국매스타이트㈜ GASKET RECOVERY Gasket Recovery is very important when the material is under cyclic loading. For example when a flange is heated expansion occurs causing increased pressure on the gasket resulting in the gasket reducing in thickness. When the loading (pressure) is reduced the gasket should recover its thickness sufficiently enough as to not impair its sealing abilities. External Pressure External Pressure

한국매스타이트㈜ GASKET RECOVERY Gasket Recovery is very important when the material is under cyclic loading. For example when a flange is heated expansion occurs causing increased pressure on the gasket resulting in the gasket reducing in thickness. When the loading (pressure) is reduced the gasket should recover its thickness sufficiently enough as to not impair its sealing abilities. The flange expands causing increased pressure on the gasket Increased External Pressure Increased External Pressure

한국매스타이트㈜ GASKET RECOVERY Gasket Recovery is very important when the material is under cyclic loading. For example when a flange is heated expansion occurs causing increased pressure on the gasket resulting in the gasket reducing in thickness. When the loading (pressure) is reduced the gasket should recover its thickness sufficiently enough as to not impair its sealing abilities. External Pressure External Pressure Gasket recovery

한국매스타이트㈜ TOTAL TIME 5 HOURS ( SEGMENTS 30 MINUTES ) HOT CREEP TEST MATERIAL : MASTITE NASB 9 2.0mm NON-ASBESTOS TEST : 5 HOUR HOT 50MPa 300  C RESULT : 8.5% CREEP 22% COLD COMPRESSION THICKNESS DECREASE mm TEMPERATURE °C STANDARD: DIN (Modified)

한국매스타이트㈜ TOTAL TIME 5 HOURS ( SEGMENTS 30 MINUTES ) HOT CREEP TEST MATERIAL : MASTITE NASB 9 2.0mm NON-ASBESTOS TEST : 5 HOUR HOT 50MPa 300  C RESULT : 8.5% CREEP 22% COLD COMPRESSION THICKNESS DECREASE mm TEMPERATURE °C STANDARD: DIN (Modified)

한국매스타이트㈜ THICKNESS DECREASE mm TEMPERATURE °C 30 mins COLD COMPRESSION MATERIAL : MASTITE NASB 9 2.0mm NON-ASBESTOS TEST : 30 MINUTES COLD 50MP RESULT : 8.5% CREEP 22% COLD COMPRESSION Decrease in Material Thickness equals 0.44mm equals 22% STANDARD: DIN (Modified)

한국매스타이트㈜ 1) What temperature is required ? 2) What internal/external pressure ? 3) Flange irregularities ? Decide on compressibility & thickness of material 4) Does the material have a low creep value ? 5) Is the material resistant to the medium being sealed? 6) Will the gasket be under cyclic loading ? Check stress relaxation & recovery CHECK LIST Remember !! Reduce thickness when using non - asbestos

한국매스타이트㈜ FINALLY Mr Mastite