4 replies to this topic

[vsnlbom]

We are having piping, which carries sub zero fluid due to changes in operation parameter. Sub zero fluid results in ice formation on outside. 

 

Is there any method to estimate maximum thickness of ice which can be formed considering zero wind speed and minimum ambient temperature.

 

This is required for estimating lowest temperature, piping may see during various mode operations/ emergency release and to check MDMT requirements.

 

The issue is as ice forms this one way ice act as an insulation which makes system cold in emergency scenarios.

[latexman]

It’s very similar to how one calculates the surface temperature of insulation, except one assumes a surface temperature of 0 C and calculates the thickness. Use ice properties for the insulation.

Google “How do you calculate the surface temperature of insulation?”

[breizh]

Hi,

Check among the spreadsheets available in this forum:

Free File Repository - Cheresources.com Community - Page 4 - Page 4

Perform a google search to get data related to ice (plenty).

 

BTW, check also for cold insulation (Foam) to mitigate the ice formation.

 

Breizh 

[vsnlbom]

For us cold temperature is issue, willing to keep bare pipe for heat gain. Insulation will also increase chances of CIU and will required additional condition monitoring.

 

Regards,

 

Hi,

Check among the spreadsheets available in this forum:

Free File Repository - Cheresources.com Community - Page 4 - Page 4

Perform a google search to get data related to ice (plenty).

 

BTW, check also for cold insulation (Foam) to mitigate the ice formation.

 

Breizh 

[Pilesar]

Why would you not assume the pipe reaches the temperature of the flowing fluid? If accidental insulation from ice formation on the outside of a pipe makes the difference between 'safe' and 'unsafe' pressure containment, then you have the wrong materials of construction.