Constant pressure testing machine and test method for ultra-high pressure and ultra-large vessels

Abstract

The invention discloses an ultrahigh-pressure extralarge vessel constant-pressure test machine and a detection method, and belongs to the field of deep-sea optical cable water tightness inspection equipment. The ultrahigh-pressure extralarge vessel constant-pressure test machine is characterized in that a pressure vessel body (4) is a spherical shell, an optical cable winding mechanism (5) of a rotating device is installed inside the spherical shell, a sealed channel (9) is formed outside the spherical shell and communicated with the interior of the spherical shell, and the sealed channel (9) is provided with a self-sealing door (7) installed in an embedded mode; an optical cable sample placed in the pressure vessel body (4) is pressurized at a constant speed, the pressure is maintained, whether the optical cable sample is broken or not is monitored, then the test is automatically ended with the test result automatically saved, the optical cable sample is subjected to a water penetration test or a hydrostatic pressure resistance test, the test is ended if the optical cable sample is broken, and a new sample is installed. According to the ultrahigh-pressure extralarge vessel constant-pressure test machine and the detection method, the internal capacity of the pressure vessel is increased, the test length of a deep-sea optical cable is increased, the test range of the optical cable is widened, and the test requirement that the optical fiber bears the ultrahigh pressure of 85 MPa or below in the deep sea at 8500 m or below can be met.

Description

technical field [0001] The invention discloses a constant pressure testing machine and a testing method for an ultra-high pressure and ultra-large container, belonging to the field of water-tightness testing equipment for deep-sea optical cables. Background technique [0002] The ultra-high voltage and super-large container constant pressure testing machine is suitable for various deep-sea optical cables and submarine optical cables laid in sea areas with a water depth of more than 1000m and no more than 8000m. It is also suitable for submarine optical cables containing feeder conductors laid in deep sea sections in the same line system cable core. It is used to measure the longitudinal water seepage performance of deep-sea optical cables under specified pressure, and to measure the hydrostatic pressure resistance of deep-sea optical cables under specified pressure. It is a necessary test for scientific research institutes, quality inspection departments and cable manufactur...

AI Technical Summary

Problems solved by technology

[0003] At present, the domestic ultra-high pressure equipment can only place the test optical cable part in the medium pressure environment, and the pressure test is below 20MPa, and the internal volume of the test container is very small, so all the test samples cannot be placed under this pressure

Although some equipment can reach a maximum of 100MPa or more, the shape of the pressure-resistant container is generally cylindrical and the volume is less than 1 cubic meter. Due to the limitation of the volume, the test length of the deep-sea optical cable generally does not exceed 500 meters, and the pressure of the container is generally more than 20 MPa, which limits the test range of deep-sea optical cables, so that the test pressure of deep-sea optical cables can only reach more than 20 MPa. With the expansion of the scope of use of deep-sea optical cables, the laying depth is getting deeper and deeper. The scope of application is far from meeting the test requirements of practical applications

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