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Cryogenic CUI inspection - no shutdown required Cryogenic CUI - - PowerPoint PPT Presentation
Cryogenic CUI inspection - no shutdown required Cryogenic CUI - - PowerPoint PPT Presentation
Cryogenic CUI inspection - no shutdown required Cryogenic CUI inspection - no shutdown required Elemental aspect of the Aussie beer coaster Elemental aspect of the Aussie beer coaster Ambient Dew Point 18.5C Td 75% RH 50% RH 23C 30C
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Elemental aspect of the Aussie beer coaster
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50% RH 30°C Ambient Dew Point 18.5°C Td 75% RH 23°C
Elemental aspect of the Aussie beer coaster
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75% RH 23°C 100% RH 18.5°C Ambient Dew Point 18.5°C Td 50% RH 30°C
Elemental aspect of the Aussie beer coaster
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100% RH 18.5°C 0°C Ambient Dew Point 18.5°C Td 75% RH 23°C 50% RH 30°C
Elemental aspect of the Aussie beer coaster
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The key is in the Dew Point (Td)
Ambient Dew Point 18.5°C Td
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Northern Australia dew point range
9am readings
28 28 28 27 26 23 23 24 27 27 29 29 81 83 82 74 65 60 60 64 68 69 72 76
10 40 70 100
Jan Feb March April May June July Aug Sept Oct Nov Dec Temperature RH %
24°C Dew Point Range 14°C
Temperature °C Humidity RH %
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Effect on dew point by removing moisture from the air
100% RH at 25°C DEW POINT 25°C
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DEW POINT 13.6°C 50% RH at 25°C
Effect on dew point by removing moisture from the air
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DEW POINT -7.7°C 10% RH at 25°C
Effect on dew point by removing moisture from the air
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DEW POINT -34.7°C 1% RH at 25°C
Effect on dew point by removing moisture from the air
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DEW POINT -51.7°C 0.1% RH at 25°C
Effect on dew point by removing moisture from the air
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DEW POINT -68.7°C 0.01% RH at 25°C
Effect on dew point by removing moisture from the air
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Air with a RH 0.01% at 25°C and a dew point Td -68.7°C is one of the driest environments on the planet Condensation is virtually eliminated allowing exposure of any temperature cryogenic pipes and vessels
Condensation eliminated
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Td -70.00 °C
T 19.21 °C RH 0.01 %
Dew point reduction – a practical application
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Dew point reduction – a practical application
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Dew point reduction – a practical application
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Case Study: LIVE cold pipe & flange de-icing and re-insulation
On the V2209 Economiser, insulation from
- ne of the vessel flanges was missing.
Permanent ice inhibited visual inspection and re-insulation whilst the process was in
- peration, this type of work would usually be
scheduled during a process shut down.
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The low dew point air was ducted into a work enclosure encapsulating the frozen flange & pipe.
Case Study: LIVE cold pipe & flange de-icing and re-insulation
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Within minutes, the ice starts to sublimate into the dry air, like a super dry sponge, eventually leaving the surface dry.
Case Study: LIVE cold pipe & flange de-icing and re-insulation
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Corrosion previously hidden under ice can now be inspected and assessed
Case Study: LIVE cold pipe & flange de-icing and re-insulation
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Finally, the dry pipe & flange are re- insulated, all without shutting down the process.
Case Study: LIVE cold pipe & flange de-icing and re-insulation
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What to consider in a practical dry air application
- Enclosure sealed & over-pressured effectively
- Dry air is also clean – no salt/corrosive aerosol particles
- Air flow management as ambient conditions change
- Internal ‘humidity’ from personnel etc compensated
- Appropriate PPE
- Personnel regularly rehydrate as per heat stress
management
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Coatings & insulation that can be applied onto low temperature pipes and vessels
We have the environment, we need the paint!
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