corrosion
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corrosion [2019/06/28 11:26] superman [Corrosion Caused by Diffusion] |
corrosion [2019/07/01 14:06] (current) superman [Direct Corrosion Monitors] |
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| - | **WikiSIS** is the place where you can find all the answers to preventing the [[wikisis|Sick Installation Syndrome]]. | + | **WikiSIS** is the place where you can find all the answers to preventing the [[wikisis|Sick Installation Syndrome (SIS)]]. |
| **Topics that affect SIS:** | **Topics that affect SIS:** | ||
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| However, as the dissolved oxygen in water is consumed by corrosion the partial pressure of oxygen in the water is lower than the partial pressure of oxygen in the atmosphere. Now if the molecular structure allows oxygen molecules to penetrate, oxygen will diffuse from the outside into the water even if this is at higher pressure. If not prevented, this is a continuous cycle as the diffused oxygen is consumed by the corrosion process and replenished from the atmosphere. | However, as the dissolved oxygen in water is consumed by corrosion the partial pressure of oxygen in the water is lower than the partial pressure of oxygen in the atmosphere. Now if the molecular structure allows oxygen molecules to penetrate, oxygen will diffuse from the outside into the water even if this is at higher pressure. If not prevented, this is a continuous cycle as the diffused oxygen is consumed by the corrosion process and replenished from the atmosphere. | ||
| + | {{:diffusie_evenwicht-01.png?400|}} | ||
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| - | All system corrode to some extent. If the corrosion rate is low this is not detrimental to the installation. However, the corrosion levels can rise quickly when there are problems such as a defective expansion vessels or water is lost due to a leak. It is often not recognised that oxygen reacts very quickly when it comes into contact with steel. A good example where fast corrosion is visible are the brake discs on a car which go rusty shortly after a rain shower. It, therefore, makes sense to monitor the corrosion rate of a heating system contineously and during the entire lifetime of the system. Nowadays there are low cost highly accurate sensors on the market which record the corrosion rate and sound an alarm if a set threshold is exceeded. Corrosion sensors are an early warning system for problems such as: | + | All system corrode to some extent. If the corrosion rate is low this is not detrimental to the installation. However, the corrosion levels can rise quickly when there are problems such as a defective expansion vessels or water is lost due to a leak. It is often not recognised that oxygen reacts very quickly when it comes into contact with steel. A good example where fast corrosion is visible are the brake discs on a car which go rusty shortly after a rain shower. It, therefore, makes sense to monitor the corrosion rate of a heating system continuously and during the entire lifetime of the system. Nowadays there are low cost highly accurate sensors on the market which record the corrosion rate and sound an alarm if a set threshold is exceeded. Corrosion sensors are an early warning system for problems such as: |
| * a defective membrane in the expansion vessel | * a defective membrane in the expansion vessel | ||
| * loss of gas pressure in the expansion vessel | * loss of gas pressure in the expansion vessel | ||
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| ==== Direct Corrosion Monitors ==== | ==== Direct Corrosion Monitors ==== | ||
| - | Risycor is a patented direct corrosion sensor that is based on a corrosion coupon but can measure the mass of the coupon online and continuously. | + | [[https://www.resus.eu/en/operation|Risycor]] is a patented direct corrosion sensor that is based on a corrosion coupon but can measure the mass of the coupon online and continuously. |
| It is a low-cost sensor that reacts sensitively to increasing oxygen levels and therefore increased corrosion in the system water. | It is a low-cost sensor that reacts sensitively to increasing oxygen levels and therefore increased corrosion in the system water. | ||
| Corrosion speed is logged every 7 hours and stored in the memory. The data can be downloaded locally or remotely via a cloud portal. | Corrosion speed is logged every 7 hours and stored in the memory. The data can be downloaded locally or remotely via a cloud portal. | ||
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| Examples of these systems are: | Examples of these systems are: | ||
| - | Hevasure | + | * Hevasure |
| - | + | * Fe-Quan | |
| - | Fe-Quan | + | |
| {{ ::fequan.jpg?400 |}} | {{ ::fequan.jpg?400 |}} | ||
corrosion.1561714017.txt.gz · Last modified: 2019/06/28 11:26 by superman
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