NO20190595A1 - Gasket with compression-limiting plate - Google Patents
Gasket with compression-limiting plate Download PDFInfo
- Publication number
- NO20190595A1 NO20190595A1 NO20190595A NO20190595A NO20190595A1 NO 20190595 A1 NO20190595 A1 NO 20190595A1 NO 20190595 A NO20190595 A NO 20190595A NO 20190595 A NO20190595 A NO 20190595A NO 20190595 A1 NO20190595 A1 NO 20190595A1
- Authority
- NO
- Norway
- Prior art keywords
- compression
- gasket
- limiting plate
- heat
- flange
- Prior art date
Links
- 238000007789 sealing Methods 0.000 claims description 20
- 230000006835 compression Effects 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 8
- 239000002253 acid Substances 0.000 claims 1
- 239000003658 microfiber Substances 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 claims 1
- 125000006850 spacer group Chemical group 0.000 description 6
- 239000000835 fiber Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002241 glass-ceramic Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering
- F16J15/121—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement
- F16J15/127—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement the reinforcement being a compression stopper
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Sealing Material Composition (AREA)
- Gasket Seals (AREA)
Description
1. Oppfinnelsens benevnelse 1. The name of the invention
Pakning med kompresjonsbegrensende anlegg. Gasket with compression limiting device.
2. Oppfinnelsens anvendelsesområde. 2. Scope of the invention.
Oppfinnelsen angår en pakning for tetting mellom boltede flenser på en varm kanal. The invention relates to a gasket for sealing between bolted flanges on a hot duct.
I det følgende benyttes eksoskanaler for store gassturbiner som et eksempel på oppfinnelsens anvendelsesområde. In the following, exhaust ducts for large gas turbines are used as an example of the scope of application of the invention.
Eksoskanaler for slike turbiner er mer enn 3000mm i diameter, og med en eksos strøm på mer enn 150 kg/sekund ved 600 °C. Exhaust ducts for such turbines are more than 3000mm in diameter, and with an exhaust flow of more than 150 kg/second at 600 °C.
En eksoskanal består typisk av flere kanalseksjoner som er forbundet med flenser, og boltet sammen i flensene. An exhaust duct typically consists of several duct sections connected by flanges, and bolted together in the flanges.
Ved start av gassturbinen oppvarmes eksoskanalens vegger og flenser til 540 °C i løpet av få minutter, hvilket medfører temperaturgradienter i eksoskanalens forskjellige konstruksjonselementer. When the gas turbine is started, the walls and flanges of the exhaust duct heat up to 540 °C within a few minutes, which causes temperature gradients in the various structural elements of the exhaust duct.
Temperaturgradienter medfører termisk vekst av eksoskanalens konstruksjonselementer, og fører til at kanalens flenser vokser på tykkelse. Flensbolter får en forsinket temperaturvekst i forhold til flenser, da boltene henter sin varme fra flensene. Temperature gradients cause thermal growth of the exhaust duct's structural elements, and cause the duct's flanges to grow in thickness. Flanged bolts have a delayed increase in temperature compared to flanges, as the bolts get their heat from the flanges.
Bolter som klemmer sammen eksoskanalens flenser strekkes tilsvarende forskjellen i termisk vekst av flens tykkelse og bolt klem-lengde. Bolts that clamp together the flanges of the exhaust duct are stretched correspondingly to the difference in thermal growth of flange thickness and bolt clamp length.
Strekket i flensbolter medfører øket klemkraft på pakninger montert mellom flensene, hvilket medfører at tradisjonelle pakninger kan skades. The tension in flange bolts results in increased clamping force on gaskets mounted between the flanges, which means that traditional gaskets can be damaged.
Videre er erfaring er at å skifte en skadet pakninger, for eksempel i vær og vind utendørs på en offshore installasjon, er det et problem å holde på plass pakningen under montasjen. Furthermore, experience shows that when changing a damaged gasket, for example in bad weather outdoors on an offshore installation, it is a problem to keep the gasket in place during assembly.
Pakningen må derfor utføres til å sikre en fullgod installasjon i løpet av kort tid, under sterk vind og regn, da nedetid for en offshore gassturbin for skifte av pakninger er forbundet med driftstap og svært store kostnader. The packing must therefore be carried out to ensure a perfect installation within a short time, during strong wind and rain, as downtime for an offshore gas turbine for changing packings is associated with operational losses and very large costs.
3. Teknikkens stand. 3. State of the art.
Kjente løsning er typisk å benytte pakninger med tettende element utført av vevet glassfibermateriale, eller vevede keramiske fiber. A known solution is typically to use gaskets with a sealing element made of woven glass fiber material, or woven ceramic fibres.
Fiberpakninger montert mellom flenser har mekaniske egenskaper som kan sammenliknes med en gummi-pakning, hvor økende forspenning i flensbolter øker pakningens komprimering ukontrollert. Fiber gaskets mounted between flanges have mechanical properties that can be compared to a rubber gasket, where increasing pretension in flange bolts increases the gasket's compression uncontrollably.
Erfaringen er at høy klemkraft fra flensene kan knuse glass og keramiske materialer i pakningen. Experience shows that high clamping force from the flanges can break glass and ceramic materials in the gasket.
Knusing av pakningens tettende element medfører at flensboltenes forspenning blir udefinert, da pakningens fjærkonstant medfører at øket klemkraft på pakningen medfører øket kompresjon av pakningen. Crushing of the gasket's sealing element means that the flange bolt's preload becomes undefined, as the gasket's spring constant means that increased clamping force on the gasket causes increased compression of the gasket.
Når gassturbinen startes varmes eksoskanalens vegger og eksoskanal flenser hurtig opp, hvilket forårsaker øket strekk i bolter som klemmer flensene sammen. When the gas turbine is started, the walls of the exhaust duct heat up and the exhaust duct flanges quickly heat up, which causes increased tension in the bolts that clamp the flanges together.
Samtidig oppstår det forskjellig termisk vekst av flenser og flensbolter. At the same time, different thermal growth of flanges and flange bolts occurs.
Erfaringen er at pakninger utført av keramiske fiber og glassfiber over tid blir sprø og knuses under første gangs montasje, og også når utsatt for høy temperatur og stor klemkraft fra øket strekk i bolter under turbinens startsekvens. The experience is that gaskets made of ceramic fiber and fiberglass over time become brittle and break during initial assembly, and also when exposed to high temperature and high clamping force from increased tension in bolts during the turbine's starting sequence.
Erfaringer er videre at eksostrykket innvendig i eksoskanalen fører til at sprø og knuste fiber-pakninger blåser ut mellom flensene, og en eksoslekkasje oppstår. Experience has also shown that the exhaust pressure inside the exhaust duct causes brittle and broken fiber gaskets to blow out between the flanges, and an exhaust leak occurs.
Stålkonstruksjoner, slik som en gassturbin eksoskanal, slår seg og deformeres permanent som følge av temperaturgradienter under oppvarming og nedkjøling, slik som for eksempel for flenser i en gassturbin eksoskanal under start og stopp av turbinen. Steel structures, such as a gas turbine exhaust duct, buckle and deform permanently as a result of temperature gradients during heating and cooling, such as for example for flanges in a gas turbine exhaust duct during start and stop of the turbine.
Ved deformasjon av flensene utsettes flensboltene for skjevstilling og bøyning, og pakninger utsettes for varierende klemkraft. When the flanges are deformed, the flange bolts are subjected to misalignment and bending, and gaskets are subjected to varying clamping force.
Varierende klemkraft mellom flensene medfører varierende kompresjon av pakninger, hvilket bidrar til at pakninger knuses. Varying clamping force between the flanges causes varying compression of gaskets, which contributes to gaskets being crushed.
Knusing og utblåsing av pakningsmaterialer medfører at klemkraft mellom flenser reduseres, og at flensboltene mister sin forspenning. Crushing and blowing out of gasket materials means that the clamping force between flanges is reduced, and that the flange bolts lose their preload.
Skadede pakninger er forbundet med driftstap og store kostnader, og erfaringen er at å skifte en pakning på en offshore utendørs installasjon kan ta lang tid, da kraftig vind blåser pakningen ut av posisjon. Damaged gaskets are associated with operational losses and large costs, and experience shows that changing a gasket on an offshore outdoor installation can take a long time, as strong winds blow the gasket out of position.
4. Beskrivelse av løsningen. 4. Description of the solution.
Ref. Fig.1, Pakning med kompresjonsbegrensende anlegg. Ref. Fig.1, Gasket with compression limiting device.
Pakningen består av tettende elementer (2) og (5) og en kompresjonsbegrensende avstandsplate (4), lokalisert mellom flensene (1). The gasket consists of sealing elements (2) and (5) and a compression-limiting spacer plate (4), located between the flanges (1).
Oppfinnelsen løser problemet med knusing av pakningsmaterialet og tap av forspenning i flensbolter ved at pakningens elastiske tettende element (2) og (5) er utført av filt laget av mikro-tynne Nikkel-legerte fibre, istedenfor glassfiber eller keramiske fibre. The invention solves the problem of crushing the gasket material and loss of pretension in flange bolts by the fact that the gasket's elastic sealing element (2) and (5) is made of felt made of micro-thin nickel-alloyed fibres, instead of glass fiber or ceramic fibres.
Pakningens tettende elementer (2) og (5) forbindes med en stål-netting (3), hvor pakningens tettende elementer (2) og (5) er sydd sammen med stålnetting (3), til å utgjøre en fast sammenstilling. The gasket's sealing elements (2) and (5) are connected with a steel mesh (3), where the gasket's sealing elements (2) and (5) are sewn together with steel mesh (3), to form a fixed assembly.
Pakning sammenstilling utføres videre med en integrert avstandsplate (4) som begrenser kompresjon av pakningens tettende elementer (2) og (5), og hvor pakningens integrerte kompresjonsbegrensende avstandsplate (4) utføres i et materiale likt med eksoskanalens flenser (1). Gasket assembly is further carried out with an integrated spacer plate (4) which limits compression of the gasket's sealing elements (2) and (5), and where the gasket's integrated compression-limiting spacer plate (4) is made of a material similar to the exhaust duct's flanges (1).
Pakningens integrerte kompresjonsbegrensende avstandsplate (4) utføres med tykkelse lik ønsket kompresjon av pakningens tegningsmateriale (2) og (5), med geometri lik flensens (1) hullbilde, slik at pakningens integrerte kompresjonsbegrensende avstandsplate (3) omslutter flensens (1) boltehull (6) og areal mellom boltehull (6), til å utgjøre en mekanisk tening i tillegg til pakningens elastiske tettende elementer (2) og (5). The gasket's integrated compression-limiting spacer plate (4) is made with a thickness equal to the desired compression of the gasket's drawing material (2) and (5), with geometry similar to the flange's (1) hole image, so that the gasket's integrated compression-limiting spacer plate (3) encloses the flange's (1) bolt hole (6) ) and area between bolt holes (6), to form a mechanical seal in addition to the gasket's elastic sealing elements (2) and (5).
Pakningens kompresjonsbegrensende avstandsplate (4) utføres med en utvendig hals (7) med skarp avslutning, med dimensjon på hals (7) slik at hals (7) ved å presses ned i hull (6) samtidig kutter hull i netting (3), og klemmer netting (3) fast mellom kompresjonsbegrensende plate (4) og flens (1). The gasket's compression-limiting spacer plate (4) is made with an external neck (7) with a sharp end, with a dimension on the neck (7) so that the neck (7) by being pressed down into the hole (6) simultaneously cuts a hole in the mesh (3), and clamps mesh (3) firmly between compression limiting plate (4) and flange (1).
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20190595A NO20190595A1 (en) | 2019-05-09 | 2019-05-09 | Gasket with compression-limiting plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20190595A NO20190595A1 (en) | 2019-05-09 | 2019-05-09 | Gasket with compression-limiting plate |
Publications (1)
Publication Number | Publication Date |
---|---|
NO20190595A1 true NO20190595A1 (en) | 2020-11-10 |
Family
ID=74758389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO20190595A NO20190595A1 (en) | 2019-05-09 | 2019-05-09 | Gasket with compression-limiting plate |
Country Status (1)
Country | Link |
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NO (1) | NO20190595A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030067122A1 (en) * | 2001-10-09 | 2003-04-10 | Hinson Kerry D. | Thermoplastic gasket with edge bonded rubber apertures and integral alignment grommets |
-
2019
- 2019-05-09 NO NO20190595A patent/NO20190595A1/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030067122A1 (en) * | 2001-10-09 | 2003-04-10 | Hinson Kerry D. | Thermoplastic gasket with edge bonded rubber apertures and integral alignment grommets |
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CHAD | Change of the owner's name or address (par. 44 patent law, par. patentforskriften) |
Owner name: NOBLE AS, NO |
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FC2A | Withdrawal, rejection or dismissal of laid open patent application | ||
FC2A | Withdrawal, rejection or dismissal of laid open patent application |