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 18.5°C Td 75% RH 50% RH 23°C 30°C

Elemental aspect of the Aussie beer coaster Ambient Dew Point 18.5°C Td 75% RH 50% RH 100% RH 18.5°C 23°C 30°C

Elemental aspect of the Aussie beer coaster Ambient Dew Point 18.5°C Td 75% RH 50% RH 100% RH 18.5°C 0°C 23°C 30°C

The key is in the Dew Point (Td) Ambient Dew Point 18.5°C Td

Northern Australia dew point range 9am readings Temperature RH % 100 Temperature °C Humidity RH % 83 82 81 76 74 72 69 68 65 70 64 60 60 24°C Dew Point Range 14°C 40 29 29 28 28 28 27 27 27 26 24 23 23 10 Jan Feb March April May June July Aug Sept Oct Nov Dec

Effect on dew point by removing moisture from the air 100% RH at 25°C DEW POINT 25°C

Effect on dew point by removing moisture from the air 50% RH at 25°C DEW POINT 13.6°C

Effect on dew point by removing moisture from the air 10% RH at 25°C DEW POINT -7.7°C

Effect on dew point by removing moisture from the air 1% RH at 25°C DEW POINT -34.7°C

Effect on dew point by removing moisture from the air 0.1% RH at 25°C DEW POINT -51.7°C

Effect on dew point by removing moisture from the air 0.01% RH at 25°C DEW POINT -68.7°C

Condensation eliminated 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

Dew point reduction – a practical application Td -70.00 °C T 19.21 °C RH 0.01 %

Dew point reduction – a practical application

Dew point reduction – a practical application

Case Study: LIVE cold pipe & flange de-icing and re-insulation On the V2209 Economiser, insulation from one of the vessel flanges was missing. Permanent ice inhibited visual inspection and re-insulation whilst the process was in operation, this type of work would usually be scheduled during a process shut down.

Case Study: LIVE cold pipe & flange de-icing and re-insulation 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 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 Corrosion previously hidden under ice can now be inspected and assessed

Case Study: LIVE cold pipe & flange de-icing and re-insulation Finally, the dry pipe & flange are re- insulated, all without shutting down the process.

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

We have the environment, we need the paint! Coatings & insulation that can be applied onto low temperature pipes and vessels

Cryogenic CUI inspection out of shutdown