These gaskets can be used with both flatsurface and raisedsurfaces pipe flanges. Non metallic elastomers, cork, compressed fibre, graphite, ptfe etc. Low stress spiral wound type gasket, lexible graphite illed 598 0. Compressibility and recovery are what make spiral wound gaskets the best metallic gaskets for most flanges. The protection of the flanges is absolute, as the geometry of the metallic carriers is always specially. Metal softmaterial gaskets these seals have proven themselves in all industrial sectors, even for difficult sealing tasks. The inner and outer diameters are reinforced with several plies of metal without filler to give greater stability and better compression and sealing characteristics. Thus the gasket has to react to the forces generated by the bolts, and therefore the work and energy imparted to the bolted joint becomes stored within the gasket itself. Is 7719 pdf, 20, metallic spiral wound gaskets specification.
Is 2712 txt, 1998, gaskets and packings compressed asbestos fibre. Flexitallic spiral wound gaskets to combat the effects of pressure and temperature fluctuations, flexibility and recovery are essential. In many spiral wound gasket applications, gasket over compression is prevented by the use of a compressionstop. The sealing element is manufactured from preformed, vshaped metallic windings with intermediate soft sealing fillers. Spiral wound gasket compressibility and pressure ratings. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world. The metallic winding material is designated by a solid colour identification around the outside edge of the centering ring. Legally binding document step out from the old to the newjawaharlal nehru invent a new india using knowledge.
The soft non metallic filler is essentially flush with the metal winding on both contact faces of the gasket, thus producing a smooth sealing surface. The gasket assembly is shown in greatly enlarged cross section in fig. Spiral wound gaskets metaflex spiral wound gaskets are manufactured from a vshaped metal strip, spirally. Fmi metallic gaskets are manufactured in accordance with international standards asme, din, en, bs and many others and can also be produced as a customized solution in order to meet customers demand. Relatively lowdensity spiral wound gaskets are used in vacuum service whereas extremely highdensity spiral wound gaskets are used in highpressure service. Scope specifie s the dimensions, tolerances, material and general requirements for metallic spiral. Especially where high pressures and temperatures and thus higher bolt forces have to be controlled and high sealing requirements have to be met. The groove receives the gasket ring g which has a plurality of alternating layers of metal stripping and gasket material formed into a spiral wound gasket ring. Properties spiral wound gaskets are suitable for use across a wide gasket stress range. In order to provide a spiral wound type gasket, in which centering of the gasket body is easy and a good sealing property at a low superficial pressure can be obtained, the spiral wound type gasket is constructed by winding a metal hoop member having an approximately vshaped cross section and a filler member in a spiral, superposed on each other. Depending on the application the spiral wound gasket can be specified with or without inner ring and outer ring. When compared with other spiral wound gaskets, the garlock metallic gasket was able to achieve equivalent tightness at a lower load in all tightness parameter values. Introducing the at5 motor circuit analyzer auto diagnosis.
Spiral wound metal jacketed camprofile industrial gaskets can be products in accordance with standards which cover types, sizes, materials, dimensions, tolerances, and markings. The metal and filler materials are wound in a circular spiral to produce alternate layers of metal and filler, with the filler serving as the sealing element, and the metal providing structural. Gasket standard types gaskets without centering and inner ring type. The metal construction provides structural strength.
Jan 23, 2021 spiral wound gaskets are incredible gaskets for both piping preferred gaskets in asme b16. The metal hoop is preformed in v or w shaped profile, which allows the gasket to act as a spring between the flanges. Metallic spiral wound gaskets number of amendments. The standard thickness of the metallic strip is 0,2 mm. Gasket handbook 1 edition fluid sealing association. Spiral wound gaskets can be used to seal fluid pressures up to 250 bar and from cryogenic elevated temperatures up to degrees. At ttl we carry the full line of lamons spiral wound gaskets. Also, ringjoint groove dimensions were not included, because they were included in asme ansi b16. Metallic spiral wound gaskets specification legally binding document step out from the old to the newjawaharlal nehru invent a new india using knowledgesatyanarayan gangaram pitroda. The stripped colour indicates the non metallic filler used between the metal winding.
Styles cg and cgi can be compressed to the ring thickness, if necessary. Outer guide ring is fitted to centralise the gasket between the bolts and to act as a compression limiter. Semi metallic gaskets are composites of metal and non metallic materials the metal is intended to offer strength and resiliency, while the non metallic portion provides conformability and seal ability. Gaskets and packing med 30 designator of legally binding document. The density of gasket is nothing but a number of layers of filler and metal strip in the given width of the gasket. While the kammprofile gasket gets a lot of attention for heat exchangers, spiral wound gaskets are also great for them. Above is the maxiflex spiral wound gaskets basic sealing element. Gaskets can be classified into three main categories. In recent years, garlock metallic gaskets has introduced some of the industrys most innovative production methods and.
These gaskets are suitable for low and high pressure and temperature applications. Metallic spiral wound gaskets specification first revision. Filler is normally used for thicknesses from 0,5 mm to 0. Klinger maxiflex spiral wound gaskets klinger thailand. The unique profiled metal strip is spirally wound to. Assembled between flat face or raised face flanges. Spiral wound gaskets masterpacasia company limited. This will not damage the gasket or affect the sealing performance and the ring is provided as a compression limiting stop. The spiral wound gasket industry is currently adapting to a change in the specification covering spiral wound gaskets. Metal jacketed gaskets require exacting conditions of flange surface finish, high bolt loads, and flange flatness in order to effect a seal. The od normally extends to the surface of the bolts. Its uses are similar to the spiral wound gasket profile s.
Spiral wound gaskets, flexpro gaskets grooved metal gasket with covering layers. Designed more than 100 years ago, spiral wound gaskets swgs are widely used as high integrity and sustainable gaskets. It is a basic configuration of spiral wound gasket. Support rings, inside and outside the spiral, improve the gaskets.
Method of test for stress relaxation of gasket materials to be withdrawn is 7714 pdf 1975. These gaskets can be fabricated in a variety of shapes and sizes recommended for use in high pressuretemperature applications. Spiral wound gaskets flexitallic pdf catalogs technical. Metal jacketed gaskets widely used in heat exchangers, pressure vessels, valves and pumps, metal jacketed gaskets feature a soft, pliable filler core encased in metal, to offer chemical and thermal resistance in diverse operating conditions. Ordering flexitallic gaskets for special flange designs. Ptfe sheet 800 700 600 400 116 ptfe 300 terncerature lsi gasket 200 100 0. The sealing element is manufactured by interleaving plies of alternating metallic winding strip and filler to create a gasket that is robust and easy to install. When ordering please specify example gasket style nominal pipe size nps pressure rating gasket standard winding materials outer ring material inner ring material flexitallic style cgi spiral wound gasket 4 class 900 asme b16. Introduction first and foremost the concept of spiral wound gasket construction was originated by flexitallic in 1912, inaugurating the beginning of a new era in safe, effective sealing. Commonly used semi metallic gaskets are spiral wound, metal jacketed and a variety of metal reinforced graphite gaskets semi metallic are designed for almost all operating conditions and hightemperature and pressure applications, and are used on raised face, click to buy now. Commonly used semi metallic gaskets are spiral wound, metal jacketed and a variety of metal reinforced graphite gaskets. Through the combination of modified spiral wound gaskets with a metallic layer a lowest possible leakage rate is also probable in a temperature range up to 750 c. Figure 6 photo of a typical pipe flange spiral wound. The metal wire in the gasket is preformed into a chevron configuration, allowing superior resiliency and selfadjustment when compared to conventional gaskets.
Spiral wound specifications canflex spiral wound gaskets manufactured in accordance with asme b16. Our standard production program comprises a range of spiral wound gaskets with inner diameters of 10 mm to 3000 mm and a nominal thickness of 3. Style ri spiral wound gasket with inner ring is designed specifically for male and female flanges, the inner ring providing radial confinement to prevent blowout of the spiral element. The solid colour on the centering ring indicates the metallic winding material. Except for weld ring gaskets, high loads are required to seat metallic gaskets, as. Leadercam camprofile fr this profile has a section that performs as the guide ring in a sr spiral wound gasket. Spiral wound gaskets shall be fitted with an inner metal ring i. All gasket specifications are sized to meet ansi standards.
It is created by winding alternating strips of metal and filler material. Spiral wound gaskets, flexpro gaskets covered serrated metal core, metal jacketed gaskets, mrgs metal reinforced gaskets. Garlock metallic gaskets, a division of garlock sealing technologies, manufactures spiral wound, metal clad, solid metal and metal core gaskets at its facility in houston, texas. Sunwell sw600 spiral wound gasket is formed of vshaped metallic strip and soft non metallic filler. A spiral wound gasket is differentmore like a thick rubber gasket because it gives as each bolt is tightened.
Figure 5 cross section of a spiral wound gasket with inner. Also known as spiral wound gaskets, these have a 18 thick carbon steel outer ring and a 304 stainless steel sealing element with a graphitebased filler. Spiral wound gasket the identification of metallic winding materials and fillers the color coding on outer ring for clear identification, zw spiral wound gaskets nominate a colorcoding system around the outside edge of the outer ring, thus allowing full identification of both the winding strip and filler materials in according to asme b16. During stress cycling, the performance of the garlock metallic gasket gaskets was excellent, compared with other spiral wound gaskets. Spiral wound gaskets combine the ease of sealing of a graphite, ptfe or mica filler with the strength afforded by a specially profiled metallic, springlike reinforcement. Required gasket compression for spiral wound gaskets spiral wound gaskets with internal or external rings, i. The metal strip holds the filler giving the gasket mechanical resistance and resilience. Reinforced inner ring spiral wound gasket style rir. These gaskets, also known as spiral wound gaskets, can be used with both flatsurface and raisedsurfaces pipe flanges. Previously api 601, the new specification is asme b16. May 15, 2019 metal provides the strength and the resilience of the gasket and the non metallic component provides the conformable sealing material.
Spiral wound gasket construction spiral wound sealing element typically inner ring composed of similar metallurgy to the winding material soft filler material metal winding gasket constant m 3 y 10,000 psi minimum stress windings can only handle maximum stress of 40,000 psi. Spiral wound gasket is composed of a steel outer ring, a spiral wound sealing strip filler and a special steel inner ring. This type of gasket should be used only as a maintenance repair item. Rir, style r equipped with an internal metal ring which acts as a compression stop and fills the space between flange. Single jacketed gaskets the filler material is enclosed in a metal jacket which covers the inside and outside diameter of the gasket. A spiral wound gasket does not have the same feel as other metallic, or even non metallic, gaskets during bolt up. The flexitallic spiral wound gasket is the precisionengineered solution for flanged joints, heat exchangers, boiler handholes, manholes, and other hightemperature, highpressure applicationsproviding resistance to virtually every known corrosive and. The primary purpose for this development was the increasingly severe temperatures and pressures used by u. Equipped with an external metal ring that ensures centering of the gasket between the bolts and the proper positioning of the winding on the sealing faces. Gaskets and packing med 30mechanical engineering division.
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