Every summer rains will become very frequent, with the increase of water often lead to the occurrence of accidents, such as urban water pipeline, such as building pipes in rainfall increases often bear the huge pressure, especially as some weak parts of the pipeline, pipe expansion joints, for example, under the excess water pressure tend to appear the phenomenon such as leakage, so early in the design should take into account the expansion pipe in the pipe run at full capacity compression performance, to guarantee the safe operation of the pipeline system.
Expansion are generally composed of alloy materials, has a strong compression capacity, and meet certain pressure will produce deformation, but the deformation is very small, in case of large flow of water is unsustainable, therefore, must adopt a in order to determine the expansion pressure resistance in pipeline operation. After completion of the expansion pipe installation, construction personnel usually adopt the method of water pressure test to detect the compressive properties of expansion pipe and pipe, often into the water pressure is normal and expansion pipe 1.5 times that of the normal operating pressure, and keep the 1 to 2 hours, if under the pressure pipe expansion system does not appear leakage phenomenon, show quality qualification, if appear leakage phenomenon, should be replaced immediately, and testing compressive performance again.
Compressive performance parameters of the expansion of the expansion pipe in the pipe system is running one of the key data, it can not only make people realize the expansion pipe to withstand the maximum pressure in a work environment, let people in the process of its work to improve maintenance and inspection of consciousness, also can make people in the construction have certain reference basis, guarantee the design discharge caused by the pressure does not exceed the expansion pipe and pipe system work pressure.
