In piping, a Gasket is sealing material placed between connecting flanges to create a static seal, which will maintain the leakage proof sealing in all operating conditions. Different types of gaskets are used to achieve the leak proof sealing between the pipe flange. The primary function of gaskets is to seal the irregularities of each face of the flange so that there will be no leakage of the service fluid from the flange joint.
Mga uri ng Gaskets na gagamitin sa ibinigay na serbisyo ng tuluy-tuloy ay depende sa mga parameter tulad ng
1. Temperature – Gasket material must withstand entire design temperature range of the fluid it handles.
2. Pressure – Gasket material must withstand entire design pressure range of the fluid it handles.
3. Corrosion resistance – Gasket material should not corrode when it comes in contact with the fluid it handles or by the environmental exposure.
4. Types of fluid – Gasket material should be capable of dealing with different type of fluids if installed in line that handles more than one types of fluids.
5. Robustness – The gasket must be capable of withstanding all movement that may occur due to change in temperature and pressure.
6. Availability – Gasket should be easily
7. Cost – Cheap and unreliable gasket should not be used at the same time it should not be costly.
Seleksyon ng Gasket
Wastong pagpili ng sapin ay depende sa mga sumusunod na kadahilanan.
Compatibility ng gasket materyal na may tuluy-tuloy.
Kakayahang upang mapaglabanan ang presyon-temperatura ng sistema.
Ang serbisyo ng buhay ng gasket
It is important to understand the requirements of particular applications before making gasket selection. Gaskets must maintain a seal for an acceptable period against all the operational forces involved. There are eight important properties which any gasket must possess to achieve this –
1. Impermeability – The gasket should not be porous to the fluid being sealed.
2. Compressibility – The gasket should compress into the imperfections on the flange sealing faces to create the initial seal.
3. Stress relaxation (creep resistance) – The gasket should not show significant flow (creep) when subjected to load and temperature. Such flow will allow the bolts to relax, reduce gasket surface stress and cause leakage.
4. Resilience – Although normally stable, flanges do in fact move slightly relative to one another under the influence of cycling temperature and pressure. The gasket should be capable of compensating for such movements.
5. Chemical resistance – The gasket should withstand chemical attack from the process medium being handled. Likewise, the gasket material itself must not contaminate the process medium.
6. Temperature resistance – The gasket should be able to withstand the effects of the maximum and minimum temperatures within the process and the external atmospheric temperatures.
7. Anti-stick – The gasket has to be easily removable after use.
8. Anti-corrosion – The gasket must not cause corrosion of the flange faces.
Mga uri ng Gaskets
May tatlong mga uri ng mga gaskets na ginagamit sa proseso ng mainit na mainit.
Hindi metal
metal
pinaghalo
| Hindi metal | Metallic – Ring Gasket | pinaghalo |
| Compressed Non-Asbestos Fiber Gasket (CNAF) | Oval Ring Gasket | Spiral Sugat Gaskets |
| PTPE Gasket | Walong sulok Ring Gasket | Comprofile Gaskets |
| goma Gasket | Metal nagdiyaket Gasket |
Ang lahat ng mga materyales ay itinuturing na may isang anti-stick patong sa magkabilang panig upang mas mahusay na protektahan ang sapin at ang machine mismo.
| materyal | Uri ng gasket | materyal | application | Maximum Maikling Tagal temperatura |
| NCA-45 | Cork Gasket | Cork / synthetic rubber timpla | Medium Oil paglaban ng karamihan Sealing application: p Valve Covers p Oil Pans p Transmission Pans |
hanggang sa 200 ° C (392 ° F) |
| CMP-4000 | Paper Gasket | Compressed MicroPore materyal, pagsasama-sama ng isang natatanging synthetic fiber matrix at ganap na cured Nitrile Butadiene goma tagapagbalat ng aklat | Magaling kakayahan at metalikang kuwintas retention mga katangian para sa OEM at Industrial Applications. | hanggang sa 350 ° C (650 ° F) |
| HFL-171 | Paper Gasket | Ganap na cured Nitrile Butadiene goma tagapagbalat ng aklat | Malakas na-duty at Pang-industriya Applica- tion: p Diesel engine p Transmission p Refrigeration p Piping |
hanggang sa 290 ° C (550 ° F) |
| HFL-781 | Paper Gasket | Kinokontrol ang pagtaas ng gasket mate- rial na may Styrene Butadiene at natural na goma binders | Malakas na-duty langis sealing Application: p Diesel engine p Oil pans p Front covers |
hanggang sa 290 ° C (550 ° F) |
| M5201 | Paper Gasket | High-density na materyal na may ganap na cured Nitrile Butadiene goma tagapagbalat ng aklat | Malakas na-duty diesel engine Application: p Oil resistance p Fuel resistance |
hanggang sa 290 ° C (550 ° F) |
| MP-15 | Paper Gasket | MicroPore may nitrile Butadi- ene binder | Magaling mababang flange presyon ng kakayahan at bolt torque pagpapanatili para sa mabigat-duty application: p Compressors p Diesel engines p Others |
hanggang sa 205 ° C (400 ° F) |
| N-8092 | Paper Gasket | Reinforced Selulusa na may nitrile binder | Magaling crush paglaban sa mataas na presyon ng flange para sa Diesel Engine at Compressor Application: p Oil p Fuel p Water |
hanggang sa 180 ° C (350 ° F) |
| PF-4S | Paper Gasket | Gawa ng tao fibers, mga advanced na fill- ers at nitrile Butadiene bind- ers | Various Oil, Air, at Coolant Application: p Oil pans p Front covers p Intake manifolds p Rear seals |
hanggang sa 290 ° C (550 ° F) |
| materyal | Uri ng gasket | materyal | application | Maximum Maikling Tagal temperatura | |
| RN8011 | papel | gasket | Mababang density selulusa hibla ma- terial na may mataas na goma tagapuno ng nilalaman at nitrile Butadiene goma tagapagbalat ng aklat | Magaling sealing sa mababang flange pressures para sa Langis at Tubig Appli- cations: p Engine p Transmission pan gaskets p Water pumps p Environmental seals |
hanggang sa 180 ° C (350 ° F) |
| S-8091 | papel | gasket | Tago lunas Styrene Butadiene nakatali na materyal na may reinforced selulusa hibla | Magaling sealing para sa: p Oil p Fuel p Low-pressure Steam |
hanggang sa 180 ° C (350 ° F) |
| TS-9016 | papel | gasket | Ganap na cured Styrene Butadiene goma tagapagbalat ng aklat at isang timpla ng Ar sa gitna at selulusa fibers | Langis at Tubig Aplikasyon | hanggang sa 290 ° C (550 ° F) |
| VB-72 | papel | gasket | MicroPore may nitrile Butadi- ene binder | Malakas na-duty na mga application: p Valve body p Applications with high fluid pressures and flow rates exposure p Erosion Resistance |
hanggang sa 290 ° C (550 ° F) |
| EMC-7201 | metal | gasket | Composite istraktura ng mataas density, ganap na cured Nitrile Butadiene nakatali gasket facings chemically at wala sa loob fused sa isang pinalawak na bakal core | Mataas na pagganap ng diesel engine structural joint application: p Gear kaso p Flywheel housings p High pressure hydraulic joints |
|
| HTX-900 7% | metal | gasket | Graphite-pinahiran, high temperature ture nakaharap materyal chemically at wala sa loob fused sa isang pinalawak na bakal core | Mataas strenght, thermal integridad, at anti-stick na pagganap sealing application: p Exhaust manifolds p Header p Collector p EGR system gaskets |
|
| ML6 | metal | gasket | Non-asbesto selulusa hibla na sinamahan ng Nitrile LaTeX at thermosetting resins | High Performance, non-extruding metal support sealing application: Intake manifolds Transmission pagpepreno sistema Industrial Application | hanggang sa 205 ° C (400 ° F) |
Blacking, buli, anodize, chrome kalupkop, sink kalupkop, nikelasyon, tinting etc.
