gases
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gases [2019/07/01 12:00] superman |
gases [2019/07/01 13:42] (current) superman |
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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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| === Micro-bubble Separators === | === Micro-bubble Separators === | ||
| + | {{ :microbubble_separator.jpg?150|}} | ||
| Unlike air vents micro-bubble separators are designed to catch the smallest bubbles that circulate through the system. They have a larger diameter than the pipework which slows the flow. The internal mesh further reduces flow and bubbles become attached. More and more bubbles accumulate to form larger bubbles. Once they are large enough the buoyancy can now overcome the flow of the water and the bubbles rise to the to of the separator where they are expelled through an automatic air vent. Micro-bubble separators should be placed at a location where most of the air comes out of solution. The ideal point according to Henry´s Law is the one with the highest temperature and lowest pressure.This is normally in the flow close to the boiler. That is why sometimes these type of separators are called thermal separators. | Unlike air vents micro-bubble separators are designed to catch the smallest bubbles that circulate through the system. They have a larger diameter than the pipework which slows the flow. The internal mesh further reduces flow and bubbles become attached. More and more bubbles accumulate to form larger bubbles. Once they are large enough the buoyancy can now overcome the flow of the water and the bubbles rise to the to of the separator where they are expelled through an automatic air vent. Micro-bubble separators should be placed at a location where most of the air comes out of solution. The ideal point according to Henry´s Law is the one with the highest temperature and lowest pressure.This is normally in the flow close to the boiler. That is why sometimes these type of separators are called thermal separators. | ||
| - | {{:microbubble_separator.jpg?100|}} | + | |
| === Pressure Step Degasser === | === Pressure Step Degasser === | ||
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| For tall systems so called pressure step degasser are used. They are not installed in line but in parallel where they ´sample´ the water into a vessel.This sample is then isolated from the system and depressurised allowing all the dissolved gases to come out of solution.Once the water is degassed it is flushed back into the system. This cycle repeats every minute or so until the system is completely degassed. | For tall systems so called pressure step degasser are used. They are not installed in line but in parallel where they ´sample´ the water into a vessel.This sample is then isolated from the system and depressurised allowing all the dissolved gases to come out of solution.Once the water is degassed it is flushed back into the system. This cycle repeats every minute or so until the system is completely degassed. | ||
| - | {{:servitech.jpg?100|}} | + | {{:drukstapontgasser-01.jpg?400 |}} |
| - | Devices such as micro-bubble separators, pressure step degassers, automatic air vents etc. cannot prevent corrosion. The oxygen in the air bubbles reacts very quickly with the steel it comes into contact with.This happens faster than the separators can expell the air. If the expelled ´air´is analysed it is found to be mainly consisting of nitrogen. | + | \\ |
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| + | Devices such as micro-bubble separators, pressure step degassers, automatic air vents etc. **cannot prevent corrosion**. The oxygen in the air bubbles reacts very quickly with the steel it comes into contact with.This happens faster than the separators can expell the air. If the expelled ´air´is analysed it is found to be mainly consisting of nitrogen. | ||
gases.1561975217.txt.gz · Last modified: 2019/07/01 12:00 by superman
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