# How long will it take to freeze a 16 carbon steel pipe using liquid nitrogen?

• dvdlane
In summary, the individual is seeking assistance in calculating the time and volume of liquid nitrogen needed to freeze a section of a 16" carbon steel pipe that is filled with water and has no flow. The water is at 20 oC and liquid nitrogen will be fed into an insulated pipe freezing jacket surrounding the pipe. The pipe jacket has an internal length of 0.5m and a capacity of 68 Litres of LN2. Assistance in these calculations would be greatly appreciated.
dvdlane
Please help. I am Trying to calculate the time taken to freeze a 16" carbon steel pipe that is full of water with no flow. The water is at 20 oC and am using Liquid nitrogen feed into an insulated pipe freezing jacket surrounding the pipe to freeze it.

If anyone can help with the calculations then your help would be much appreciated.

thanks

I meant to add that I also need to calculate the volume of liquid nitrogen required to freeze the pipe, then the volume to maintain the freeze for a period of time.

How long is your 16" pipe?

The pipe is very long but the section being frozen is within the pipe freezing jacket. The pipe jacket has an internal length of 0.5m where the liquid nitrogen will be in contact with the pipe. The pipe jacket when full will hold 68 Litres of LN2.

## 1. What is the purpose of pipe freezing calculations?

Pipe freezing calculations are used to determine the amount of time and amount of refrigerant needed to freeze a section of pipe, in order to safely perform maintenance or repairs without needing to shut off the entire system.

## 2. How do you calculate the freezing time for a pipe?

The freezing time for a pipe is calculated by taking into account the diameter and material of the pipe, the ambient temperature, and the type and amount of refrigerant being used. There are various formulas and tables available for these calculations.

## 3. What factors can affect the accuracy of pipe freezing calculations?

The accuracy of pipe freezing calculations can be affected by factors such as changes in ambient temperature, variations in pipe material and thickness, and inconsistencies in refrigerant flow rate.

## 4. Can pipe freezing calculations be used for all types of pipes?

No, pipe freezing calculations are typically used for metal pipes, such as copper or steel. They may not be as effective for plastic or PVC pipes, as the freezing process can cause damage to these materials.

## 5. Are there any safety considerations when performing pipe freezing calculations?

Yes, it is important to follow proper safety protocols when performing pipe freezing calculations and using refrigerants. This includes wearing protective gear, ensuring proper ventilation, and following the instructions of the refrigerant manufacturer.

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