1, gasket and flange sealing surfaces should be thoroughly cleaned, without affecting sealing performance of connections of any scratches, spots and other defects.
2, small outer diameter of the gasket should be bifalan outside the sealing surface, gasket inner diameter should be slightly larger than the pipe diameter, inner diameter of two and generally the gasket thickness twice times to ensure that after pressing, gasket inner edge does not extend into the container or pipe, so as not to impede the flow of fluid in the container or pipe.
Preload 3, gasket should not exceed design requirements so as to avoid excessive gasket compression loss resilience.
4, gasket when pressing, it is best to use a torque wrench. The large bolt and high strength bolts, hydraulic tightening device is best used. Tightening torque should be calculated according to a given sealing gasket compression through calculated hydraulic hydraulic tightening size should be determined by calculation.
5, when the gasket is installed, in order to tighten the nut. But should not be screwed once reached the designed value. At least cycle two or three times, so that the sealing gasket stress distribution.
6, combustible and explosive media, pressure vessel and piping, replacement gasket should be used when security tool, so as to avoid tool have collided with flanged or bolted, spark and cause a fire or explosion.
7, pipe in case of spill, must install gasket replacement or adjustment after antihypertensive treatment, no pressure.