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Drainage Facilities For Propane Terminal


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#1 molanox

molanox

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Posted 01 March 2017 - 05:46 PM

There is a Propane Import - Export terminal which comprise:

  • Jetty facilities; Tank Cargo.
  • A main transport line 20” from the dock to refrigerated tanks at -42 °C, 2 km long.
  • Pumps facilities to transport trailers, suction line 20” (300 m long) and discharge line 8”.
  • Pumps facilities to tanker, suction line 36” (300 m long) and discharge line 20”.

Since tank cargo comes to the dock once a month, it is not recommended hold refrigerated propane in the 36” suction line, we are not sure altogether about the best solution for draining these lines, we have been thinking about the following solutions:

  1. Flushing the line with N2 and recycling refrigerated Propane to the storage tank, we find that pumps are not required because N2 could be injected with enough pressure to displace the liquid.
  2. Flushing the line with N2 and send Propane to another refrigerated tank where the liquid would be pumped to the storage tank.

We are not sure that these solutions could be the best, and low risk.

Could anybody tell us, if there is or are another or better solution? or if These solutions could work?

It is not necessary to drain another pipes since the plant has another facilities to do so.

 

For the best understanding, I attached some process sketches for solutions 1 and 2.

Attached Files



#2 Bobby Strain

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Posted 01 March 2017 - 09:07 PM

You will probably soon realize that keeping the line cold and liquid filled is the best alternative. So you should have a look at how you can accomplish this with a circulating system.

 

Bobby



#3 ankur2061

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Posted 02 March 2017 - 12:40 AM

molanox,

 

In my opinion, Option 2 is a better option. Following would be the reasons for choosing this option:

 

1. The smaller vessel could be designed as a pressure vessel with design pressure equal to the nitrogen system pressure. Probably your refrigerated tank is not designed for nitrogen blowout once the suction line is drained. You need to check this out.

 

2. You could install the new vessel at a safe location and also vent it to a safe location so that even if there is a nitrogen blowout, any entrained propane liquid droplets with nitrogen does not create a fire / explosion hazard and a safety risk for operating personnel. You may need to perform a HAZOP study to understand and mitigate risks for the new drain system for either of the options that you choose.

 

3. The smaller new vessel could be a buried and mounded vessel to mitigate fire and explosion risk due to accumulation of propane vapors or propane spillage. Again, a HAZOP study would help you in determining the best configuration for the new vessel.

 

Hope this helps.

 

Regards,

Ankur.






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