HAAS - CATALOG 7.5 Side 367
Kommercielt kundetilbud **Top-sælgere fra Otto Haas
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SEALING MATERIAL "OHA-SPECIAL" Under no circumstances should screws be screwed into the gasket, or they may be pierced by force, as cracks may occur which will not ensure a later "tightness". Centered the seal must be insert without mechanical stress. The proper installation must be ensured for tongue and groove flanges. If necessary, assembly aid, e.g. use flange spreaders. The seal must be installed dry without additional sealing aids. Oil or greasy sealants damage the seal. The seal flows under surface pressure in the installed condition and can in the during operating condition by temperature exposure lead to failure application of the gasket. Despite use of assembly or disassembly aids, the compatibility with the sealing material must be given. The screws must be checked for easy movement before installation. Do not use dry or rusty screws. If necessary, use new screws. It is recommended to coat the threads with the lubricant provided to ensure a smooth running and, thus, the lowest possible friction values. After inserting the gasket, the screws must be installed and tightened so that a play-free contact of the connecting elements is provided. Check the seal centering once again and tighten the screws. Tighten the screws are in two to three passes "over Cross " uniformly to achieve a uniform surface pressure. In the first stage, the flange screws with approx. 50%, then with approx. 80% and ultimately attracted with 100% of the recommended torque. The tightening should be perceptibly reach until to the maximum tightening force respectively. This ensures a secure and permanent seal. Simply put, the gasket must be compressed by approximately 50%, i.e. a 2 mm thick gasket should be pressed to a endthickness of about 1 mm. This can be very easily controlled via the gap between the flanges. All screws must have the specified tension, therefore the tightening torque must be checked several times. As a minimum surface pressure in the installed state, approximately 30 N / mm2 must be applied. Tightening with a torque wrench or more precise methods is recommended but can be restricted to special cases at high pressures and temperatures or critical installation conditions. When these instructions are observed, it is usually not necessary to tighten the seals. If at all a retightening, then only during the start-up phase of the pipeline or system. Prevention of case of damage The compressible and spring-back flat gasket should compensate for unevenness of the flanges, must be media-resistant and temperature-resistant and with stand the loads acting on it by flange screw forces and internal pressure. The most common reasons for the failure of sealing points are: • Use of sealing aids • Use of assembly and disassembly auxiliaries with function-impairing properties • Use of overlapping single gaskets • Reuse of old gaskets • Choice of the wrong sealing material • Use of incorrect seal dimensions and faulty seat of seal • uneven, dirty, damaged or corroded flange surfaces • Flange sheet deformations, flange blade inclinations • inadequate installation surface pressure • uneven load due to screw forces • Damaged threads on screws and bolts • Do not grease the screws • Omitting of washers • inadequate screw forces (too low sealing pressure) • weak flanges Limits of use in the most important media groups depending on pressure and temperature: Oil, Refrigerant Saturated steam Pressure 0 40 80 100 75 75 50 50 25 0 120 160 200 240 280 320 360 -100 -50 Temperature [º C] 0 50 100 150 200 250 300 350 400 Temperature [º C] Various media Gases 100 100 75 75 50 50 Pressure [bar] Pressure [bar] Aqueous solutions 100 Pressure [bar] 100 90 80 70 60 50 40 30 20 10 0 Pressure [bar] Pressure [bar] Water, Watersteam 25 0 -100 -50 0 50 100 150 200 250 300 350 400 Temperature [º C] 17 Sealing material "OHA-Special" 25 0 -100 -50 0 50 100 150 200 250 300 350 400 Temperature [º C] The application limits for temperature and pressure in the diagrams apply to a sealing thickness of 2 mm and when using smooth flanges. Roughness depth 40 - 100 μm. Higher stresses are possible with thinner seals. Disclaimer of Warranties 25 0 -100 -50 0 50 100 150 200 250 300 350 400 Temperature [º C] The versatility of the installation and operating conditions, as well as the application and process technology, can only be regarded as non-binding guidelines in this brochure. All previous editions are hereby invalid. A warranty claim can not therefore be derived. Illustrations, dimensions and descriptions are not binding. We reserve the right to make technical changes!
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