Foam fused ports on atmospheric storage tanks seals
Foam fused ports on atmospheric storage tanks seals
(OP)
Could anyone advise me whether there is any standard and/or code for specifying a foam port that can let the fire fighting foam go between the floating roof seals in case of fire..?? I heard about NFPA regulations every 3 meters along the secondary seal but what about the size of it and fusing material spec.?
Thank you
Thank you





RE: Foam fused ports on atmospheric storage tanks seals
RE: Foam fused ports on atmospheric storage tanks seals
I found out the NFPA rules which seem very minimum though.. and the European EN 14 015 2004 standard mentionning this..
I must add that these foam traps are being a real safety issue as in case of fire and /or late foam delivery, these could be an additional source of oxygen feeding the fire..
I believe delivering foam right from the center of tank and distributed directly through these holes with correct piping just in the middle of the flotating rook seals is a much safer and quicker solution...
See for information what I got from elsewhere and many thanks again
EN 14015:2004 (E)
E.5.6 Compression plate secondary seals
Depending on the maximum expected rim space, a minimum compression plate height shall be
provided for satisfactory operation.
NOTE 1 The compression plates should incorporate foam ports to allow fire fighting foam to enter the rim
space.
NOTE 2 Compression plate secondary seals have good centering forces and protect the sealing curtain
against sun light and weathering.
NOTE 3 The height of the required foam wall and the maximum lifting height of the floating roof are
determined by the maximum contact point between the secondary seal and the tank wall.
RE: Foam fused ports on atmospheric storage tanks seals
If you pipe through the compression plate seal you need some kind of flexible connection so the seal can accomodate tank out of roundness and floater movement.
If you use burn out panels, they should be sized to pass the flow rate of foam needed to flood the seal area behind it in the time required.