External Floating roof tank - Design Pressure

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Mechie Active Contributor Join Date: Dec 2008 Posts: 24	External Floating roof tank - Design Pressure 03/07/2009 2:43 AM
	Dear Friends, 1) I am designing a external floating roof tank. I want to know that what should be the maximum internal design pressure for this tank. As per EN14015 table 3 it is '0'. If so is PVV required for this tank? 2) What should be the maximum gap between rim and shell?
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XMech Power-User Join Date: Jan 2009 Location: Western Canada Posts: 295 Good Answers: 51	#1 Re: External Floating roof tank - Design Pressure 03/07/2009 5:27 PM
	1) a) Zero design pressure, that is correct. 1) b) Please review Annex D.3.11 (yes, it is generally good practice ) 2) The distance is not explicity stated, and as per Annex E.2 of EN14015: "The clearance between the floating roof and tank wall shall allow the floating foof to slide up and down the tank wall. The seal design shall prevent the vapours of the product contained therein from escaping. The rim seal shall also prevent the penetration of rain water into the tank." These ambiguous statements are to allow various configurations of seal arrangement. The normal distance from the inside shell wall to the outer rim of the floating roof is about 200 mm. __________________ A little knowledge is a dangerous thing.
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pipewelder Guru Join Date: Apr 2007 Location: North Georgia, USA Posts: 671 Good Answers: 33	#3 In reply to #1 Re: External Floating roof tank - Design Pressure 03/09/2009 8:10 AM
	Very good answer, short and sweet and to the point. __________________ pipewelder
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Isti80 Guru Join Date: Feb 2007 Location: Next to the Prime Merridian (51°29'34.50"N 0°13'32.85"W) Posts: 780 Good Answers: 1	#2 Re: External Floating roof tank - Design Pressure 03/08/2009 8:23 AM
	What is external? 1. The internal pressure will be whatever liquid quantity you're gonna have in your tank, the roof will only be floating on top. 2. We built two of these type of tanks once (about 50m in diameter) and the gap was barely 4" between the float and the shell, where we tucked a strip of sponge to seal it with to lift it up with air. However, the actual gap between the edge of the roof and the shell was may be 2" only. I don't remember about the type of seal used, I missed that part. I guess you should find out about it b4 hand. __________________ Making mistake is part of learning.
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Mechie Active Contributor Join Date: Dec 2008 Posts: 24	#4 Re: External Floating roof tank - Design Pressure 03/11/2009 2:23 AM
	Friends, Thanks a lot for your guidance...
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Isti80 (1); Mechie (1); pipewelder (1); XMech (1)

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