Heat transfer system safety: Comparing the effectiveness of batch venting and a light-ends removal kit (LERK)
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Type
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Journal
Article
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Author
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Christopher
Ian Wright
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Author
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Julien
Premel
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URL
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Free
Full Text Source: http://www.sciencedirect.com/science/article/pii/S2214157X1400029X
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Publication
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Case
Studies in Thermal Engineering
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Date
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16
September 2014
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Abstract
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The
heat transfer fluids (HTF) should be analyzed at least once a year to
determine the extent of thermal degradation. Under normal operating
conditions, mineral-based HTFs will thermally degrade and so the bonds
between hydrocarbons break to from shorter-chain hydrocarbons known as
light-ends. These light-ends accumulate in a HTF system and present a
potential fire risk. Light-ends can be removed from a HTF system via a batch
vent or installation of a light-ends removal kit (LERK).
Data was collected prior to and following batch venting or installation of a LERK. The main study parameter was closed flash temperature as open flash temperature and fire point did not change considerably. Analysis showed that both methods increased closed flash temperature in excess of 130 °C three months after the intervention, so both methods were deemed effective. Data showed that the percentage change achieved with the LERK, compared to batch venting, was 2-fold higher at three months and 10-fold higher at 6 months. The duration of effect was longer with the LERK with closed flash temperature being stable and consistently above 130 °C for 50 months after being permanently installed. This case highlights the effectiveness of a permanently fitted LERK which is effective for the longer-term control of closed flash temperature. |
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