Influence of drain holes in jacketing on corrosion under thermal insulation
Jacketing or a weather barrier is usually installed in insulated piping systems and pressure vessels to prevent water ingress and protect the insulation. In the event of water penetration and accumulation resulting from poor design and/or aging of the jacketing, drain holes are proposed to accelerat...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/45538 |
| _version_ | 1848757313707442176 |
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| author | Pojtanabuntoeng, T. Machuca, L. Salasi, Mobin Kinsella, B. Cooper, M. |
| author_facet | Pojtanabuntoeng, T. Machuca, L. Salasi, Mobin Kinsella, B. Cooper, M. |
| author_sort | Pojtanabuntoeng, T. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Jacketing or a weather barrier is usually installed in insulated piping systems and pressure vessels to prevent water ingress and protect the insulation. In the event of water penetration and accumulation resulting from poor design and/or aging of the jacketing, drain holes are proposed to accelerate the water dry-out process. This study investigated the influence of jacketing and drain holes on corrosion under insulation of carbon steel. In an enclosed system without the drain holes, where the water dry-out process is reduced, the underlying steel remains exposed to the corrosive environment for a longer period of time. Severe pitting corrosion was observed, which could be a result of limited oxygen diffusion into the insulation creating differential aeration environments favorable for pitting corrosion. The presence of drain holes promoted the water dry-out rate and oxygen diffusion into the insulation. As a result, the average corrosion rate increased in short-term exposure tests, but over a longer term the average corrosion rate, as well as the pitting rate, decreased. |
| first_indexed | 2025-11-14T09:26:07Z |
| format | Journal Article |
| id | curtin-20.500.11937-45538 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:26:07Z |
| publishDate | 2015 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-455382017-09-13T14:20:52Z Influence of drain holes in jacketing on corrosion under thermal insulation Pojtanabuntoeng, T. Machuca, L. Salasi, Mobin Kinsella, B. Cooper, M. Jacketing or a weather barrier is usually installed in insulated piping systems and pressure vessels to prevent water ingress and protect the insulation. In the event of water penetration and accumulation resulting from poor design and/or aging of the jacketing, drain holes are proposed to accelerate the water dry-out process. This study investigated the influence of jacketing and drain holes on corrosion under insulation of carbon steel. In an enclosed system without the drain holes, where the water dry-out process is reduced, the underlying steel remains exposed to the corrosive environment for a longer period of time. Severe pitting corrosion was observed, which could be a result of limited oxygen diffusion into the insulation creating differential aeration environments favorable for pitting corrosion. The presence of drain holes promoted the water dry-out rate and oxygen diffusion into the insulation. As a result, the average corrosion rate increased in short-term exposure tests, but over a longer term the average corrosion rate, as well as the pitting rate, decreased. 2015 Journal Article http://hdl.handle.net/20.500.11937/45538 10.5006/1861 restricted |
| spellingShingle | Pojtanabuntoeng, T. Machuca, L. Salasi, Mobin Kinsella, B. Cooper, M. Influence of drain holes in jacketing on corrosion under thermal insulation |
| title | Influence of drain holes in jacketing on corrosion under thermal insulation |
| title_full | Influence of drain holes in jacketing on corrosion under thermal insulation |
| title_fullStr | Influence of drain holes in jacketing on corrosion under thermal insulation |
| title_full_unstemmed | Influence of drain holes in jacketing on corrosion under thermal insulation |
| title_short | Influence of drain holes in jacketing on corrosion under thermal insulation |
| title_sort | influence of drain holes in jacketing on corrosion under thermal insulation |
| url | http://hdl.handle.net/20.500.11937/45538 |