Wire rope is an important material often used in industrial production. However, in the long-term use of the process, the quality of the wire rope will be affected by a variety of factors, there will be aging, corrosion, fracture and other problems, thus affecting its service life and safety. In order to ensure the safety of users and the normal progress of industrial production, a series of regulations on the scrap standard of wire rope have been formulated. So what are the rules?
What is the standard of steel wire rope
Scrapping standard of steel wire rope is refers to the fact that under certain conditions, the use of wire rope has reached due to fatigue or other reasons no longer applicable to the design purpose of state, must stop using and shall be removed or destroyed. In fact, with the continuous accumulation of various mechanical and environmental factors in the use of the wire rope, its structure and performance will experience a series of changes, when these changes exceed a specific limit, it means that the wire rope can no longer be used.
According to the national standards, what are the main standards of steel wire rope national standard is one of the important reference standards for wire rope scrap. According to the provisions of "GB/T 8918-2016 Inspection of Steel wire rope", the scrap standard of steel wire rope includes the following aspects:
The case of breakage
As soon as possible after breaking, it is necessary to stop using, and remove or destroy. In this case, the broken point should be retained as evidence to facilitate subsequent accident investigation and analysis.
(2) Bending damage
In use, it is very common for the wire rope to be damaged by bending, but when the degree of damage exceeds a certain range, it is necessary to stop using. According to the national standard, when there is obvious flattening, stripping, cracking or deformation at the bend of the wire rope, it should be regarded as having reached the scrap standard.
(3) Corrosion and wear
Since wire ropes are usually used in harsh environments, corrosion and wear are inevitable. However, when the depth of corrosion or wear exceeds a certain degree, it will have a negative impact on the strength and stability of the wire rope, and it is necessary to stop using. According to the national standard, when there is obvious corrosion, wear or depression on the surface of the wire rope, it should be regarded as having reached the scrap standard.
(4) Strength difference
Because the wire rope will be affected by a variety of factors during use, there will be a certain degree of strength difference between different parts. However, when these differences exceed a certain range, it will affect the normal use of the wire rope, and it is necessary to stop the use. According to the national standard, when the strength values of different parts of a wire rope differ greatly, it should be regarded as having reached the scrap standard.
2. What are the scrap standards of steel wire rope
In addition to the basic scrapping standards stipulated by national standards, there are actually some other scrapping standards, which may differ due to different use environments, different design requirements or different manufacturers. Here are some representative scrapping criteria:
(1)the service life of the service life of wire rope is refers to under the condition of normal use can keep the original performance and the reliability of the time. According to international standards, the service life of wire rope is usually 5 to 10 years. However, in certain circumstances, such as high temperature, low temperature, humidity and other environments, the service life may be shorter.
(2)the fiber damage in the process of the fiber damage refers to the use of steel wire rope, wire rope due to external force or friction factors such as the deformation of the fiber break or situation. When fiber damage exceeds a certain level, it is necessary to consider discontinuing use.
(3) fatigue in use process, wire rope will experience many loading, this may lead to wire rope fatigue. When the fatigue limit of the wire rope reaches or exceeds a certain degree, it needs to stop using.
