【Corrosion Technology Edition】Daily Question 20170811: What is corrosion margin?
Thread Content
To boost the popularity of the Mechanical Equipment Corrosion Technology section, enhance communication among users, and enable everyone to learn together, make progress together, and improve together, we have launched the 【One Question per Day】 activity. Reward rules: 3 wealth points for replying, 10 wealth points for correct answers. This topic is valid for two days; no score will be given if it exceeds two days. Term explanation: What is corrosion margin? Corrosion margin = Actual thickness of the equipment – Minimum allowable thickness of the equipment ===================================== Recruitment for moderators and technicians in the Mechanical Section; applications and referrals are welcome. 【Valid indefinitely】If you’re interested, come ahead! http://bbs.hcbbs.com/thread-1568748-1-1.html
Corrosion margin, corrosion allowance, and permissible degree of corrosion are all the same thing. The additional wall thickness provided to account for the corrosion of the material by the medium inside the container is known as the corrosion margin. It mainly depends on factors such as the uniform corrosion rate of the medium on the material and the design life of the container. So the unit is mm.
The basic meaning of corrosion allowance in the design of chemical and environmental protection projects is the maximum allowable depth of corrosion that can occur due to the corrosive effect of environmental media, leading to equipment failure during its normal service life (such as in containers, pipes, flanges, valves, pumps, etc.). To prevent container components from becoming weakened due to corrosion or mechanical wear, which can lead to a reduction in thickness, a corrosion margin should be considered for the cylinder walls, heads, nozzles, manholes, and internal components that are in contact with the working medium. For components that are corroded or worn, the corrosion margin should be determined based on the expected service life of the container and the rate at which the medium corrodes the metal material. The corrosion margin can generally be determined based on the uniform corrosion rate of the steel in the medium and the design life of the container. Generally, there are detailed design reference values depending on different operating conditions, as well as various material and structural characteristics; these can be found in relevant design manuals. In the absence of special corrosion conditions, for carbon steel and low-alloy steel, the corrosion margin shall be not less than 1 mm ； For stainless steel, when the corrosivity of the medium is extremely low, a corrosion margin of zero can be adopted. However, corrosion margin is only meaningful for preventing uniform corrosion failure ； For non-uniform corrosions such as stress corrosion, hydrogen embrittlement, and crevice corrosion, increasing the corrosion margin is not an effective method for preventing corrosion; in such cases, emphasis should be placed on selecting corrosion-resistant materials or applying appropriate anti-corrosion treatments.
The additional wall thickness margin taken into account to account for the corrosion of the material by the medium inside the container is called corrosion margin.
Corrosion margin, corrosion allowance, and permissible degree of corrosion are all the same thing. The additional wall thickness provided to account for the corrosion of the material by the medium inside the container is known as the corrosion margin. It mainly depends on factors such as the uniform corrosion rate of the medium on the material and the design life of the container. So the unit is mm.
I don’t know; I’m here to see the answers from the experts
The additional wall thickness margin taken into account to account for the corrosion of the material by the medium inside the container is called corrosion margin. It mainly depends on factors such as the uniform corrosion rate of the medium on the material and the design life of the container.
The additional wall thickness margin taken into account to account for the corrosion of the material by the medium inside the container is called corrosion margin.
Actual thickness of the device – Minimum thickness permitted for the device
The additional wall thickness margin taken into account to account for the corrosion of the material by the medium inside the container is called corrosion margin. It mainly depends on factors such as the uniform corrosion rate of the medium on the material and the design life of the container.