Common practice for unloading arm drainage

  • #1
DoItForYourself
Hello all,

Does anybody know the common practice used for draining an unloading arm which contains and transfers Volatile Organic Compounds (for example LPG, propylene, ethylene) and which is installed in a breasting island (away from land but not necessarily too far)?

I searched the web and found some practices like the following:

1. Drainage of the VOC into the sea.
2. Venting of the VOC in the atmosphere.
3. Pressurization of the arm and purging of the VOC to the plant (that accepts the substance).
4. Drainage of the arm in berth slop systems or transfer to a land slop system.

Thank you in advance,
Chris
 

Answers and Replies

  • #2
192
89
In addition to the options you listed, some systems flare off (i. e., burn) the residual material. Assuming efficient combustion and no contaminants such as sulfur compounds, the VOC's are converted to CO2 and water vapor.
 
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  • #3
DoItForYourself
This is a very good idea, but it needs investment and space (in the breasting island) to install the equipment. The problem is not environmental, since the emissions are very low (and there is not relative legislation that applies). The problem has to do with safety, because in a possible leakage, the air around the arm will be inflammable.

I was just wondering what is the most adopted and the best practice for such cases (worldwide or in US).

Thank you very much
 

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