5 replies to this topic

[Nagarajan K]

Dear All,

 

I have Prepared a Excel Sheet for Calculation of time and quantity of LPG Required for Cooling of Jeety Pipeline.

Here in this case no anyother cooling utility is available.

So i shall be cooling entire pipeline using my inventory LPG product at terminal available to me before unloading of Ship LPG Product.

 

Please let me know if there is any Correction.

 

Regards,

 

Nagarajan K

Attached Files

•  LPG FOR COOLING.xlsx   27.02KB   345 downloads

[Bobby Strain]

We can't comment with such little information given.

 

Bobby

[Nagarajan K]

Dear Bobby,

 

Its just the method of Calculation given in excel and every data is given in excel sheet.

 

Still,

 

LPG Storage condition in Refrigerated Storage Tank is minus 40 Deg C,

Ambinet Condition is 40 Deg C.

 

Solar radiation per hour is also assumed in this case

 

Pipe is 14000 m long,

So i have calculated time required to cool pipeline from 40 Deg c to close to minus 40 Deg C (Therotically)

 

Every yellow cell is input and with description.

 

Thanks

[thorium90]

Im sure you will take a lot more time and use alot more LPG than what you have calculated.
Its not quite possible to assume a uniform temperature across 14km of pipeline...

[Art Montemayor]

I believe what Bobby is drawing attention to is that the basis of HOW the cooling is proposed to be done hasn't been explained.  For example, I believe that what is being proposed is a cool-down, recirculation loop for circulating stored, cold LPG.  A quantity of cold, liquid LPG is going to be circulated through the 14 km pipeline.  What will happen to the vaporized portion that is generated due to the heat pickup hasn't been explained (and may not be important for now).  Certainly, the speed of the cool down is controlled by the available re-condensing capacity of the evaporated LPG.  You can't cool down faster than that.

 

However, if this is true, then this is a classical unsteady state heat transfer operation and very complex to model and calculate.  A lot of simplifying assumptions have to be made and more information is required.

 

It certainly can't be as simple as depicted in the Excel workbook.

 

Please elaborate and explain all the details of what is being proposed.

[Nagarajan K]

Hii Art,

 

Thanks for looking into the case..

 i have used the reference as attached.

 

Can any One try to convert it into Excel as i tried out my best.

 

 

Thanks in Advance

Attached Files

•  HP0805+CHEN+REPRINT.pdf   316.8KB   515 downloads