RE: LPG TANK

From: <Bruce>
Date: Wed Apr 12 2006 - 12:48:00 EDT

Dear whomever you are, wherever you are (you should make that clear in your request):

If you are looking at propane (C3), any leak is not likely to be in a liquid state long enough to need a dike VOLUME of even 25%. Unless you are in northern Canada, northern Alaska, northern Siberia, and such where temperatures are normally below -40 deg for very long periods. If you are outdoors in the Middle East and many other parts of the world, butane is also going to evaporate fairly quickly.

In the case of leaks of liquids of boiling point over about 15 deg C, the usual practice is to design and install a containmnet volume equal to the tank volume, plus some freeboard (to allow for wind and cleanup operations without spilling some over the side), plus 10 (or sometimes 20) year rain event.

If you can design around any scenario that allows leakage to completely empty from the tank, you can get by with less volume, as appropriate, or if due to other considerations, the tank's full capacity is much more than it's maximum intended design capacity.

                            ... Bruce D. Bullough ...
                            Sebesta Blomberg & Associates, Inc.
                            2381 Rosegate
                            Roseville, MN  55113          USA
                            desk: 651-634-7344   fax: 651-634-7400
                            www.sebesta.com

-----Original Message-----
From: <a href="/group/PipingDesign/post?postID=Gl-erK4ZPJj8ZRD-nUUdp9RaLvuqb61bBwYPE1ZBDzOhO6gjIb3D7aLqU-4Hhsn9wVZ31nvxBhUWdEGoChqMt3MhkA">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=Gl-erK4ZPJj8ZRD-nUUdp9RaLvuqb61bBwYPE1ZBDzOhO6gjIb3D7aLqU-4Hhsn9wVZ31nvxBhUWdEGoChqMt3MhkA">PipingDesign@yahoogroups.com</a>] On Behalf Of HORMOZ
Sent: Wednesday, April 12, 2006 10:08 AM To: <a href="/group/PipingDesign/post?postID=Gl-erK4ZPJj8ZRD-nUUdp9RaLvuqb61bBwYPE1ZBDzOhO6gjIb3D7aLqU-4Hhsn9wVZ31nvxBhUWdEGoChqMt3MhkA">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] LPG TANK [bayes]

Dear all

I want define dike area for tanks that contain C3 & C4.

I'm confuse between 25% or 100% of the volume of the largest tank according
to API 2510.

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