Insulation of Low Temperature Nitrogen Lines
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| Installation of Armaflex on lines at temperatures down to -200 °C. |
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The Armacell recommendations for installation of Armaflex flexible insulation on chilled water and refrigeration systems should be strictly followed. These are detailed in the » Armaflex Installation Manual.
- Fit all material under tight compression to allow for shrinkage as the system and insulation material cools down to working temperature. This is particularly important for the innermost layers of insulation.
- When using tube material use the next larger bore size to allow for tube shrinkage under the cold conditions.
- After the first layer of Armaflex has been installed, apply a cover of aluminium foil, minimum thickness 0.05 mm using complete adhesive coverage. This will provide an additional barrier against liquid oxygen.
- For second and subsequent layers of Armaflex use sheet materials with all seams and butt joints overlapped and staggered.
- Bear in mind that shrinkage may also take place in the thickness of the insulation particularly with the inner layer due to the extreme cold. The overall thickness should be adjusted to take account of this and allow an adequate margin of safety.
- The Armaflex will lose its flexibility at low temperature but this does not impair its performance.
- The thickness of insulation required will be dependant upon the pipe size and ambient conditions. For flat surfaces under normal ambient condition, 20 ºC and 70% relative humidity, the thickness required may be of the order of 150 mm.
- Our Customer Services Department will be pleased to advise on the thickness required to meet your particular application.
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