Internal FLoating Roof Requirement
Internal FLoating Roof Requirement
(OP)
HI all,
as per the Tittle, is it Non Mandatory/Optional to Install Secondary Seal.
Refer to API 650 Appendix H :
"H.4.4 Peripheral Seals
In addition to the required floating roof primary peripheral seal, secondary peripheral seals shall be provided if
specified on the Data Sheet, Line 31. Floating roof primary and secondary peripheral seal types and configurations
shall be provided as specified on the Data Sheet, Line 31.
H.4.4.1 A peripheral seal (also referred to as “rim seal”) that spans the annular space between the internal floating
roof deck and the shell shall be provided.... "
What is the industrial practice commonly used for internal floating roof?
Thank you
Yanuar
as per the Tittle, is it Non Mandatory/Optional to Install Secondary Seal.
Refer to API 650 Appendix H :
"H.4.4 Peripheral Seals
In addition to the required floating roof primary peripheral seal, secondary peripheral seals shall be provided if
specified on the Data Sheet, Line 31. Floating roof primary and secondary peripheral seal types and configurations
shall be provided as specified on the Data Sheet, Line 31.
H.4.4.1 A peripheral seal (also referred to as “rim seal”) that spans the annular space between the internal floating
roof deck and the shell shall be provided.... "
What is the industrial practice commonly used for internal floating roof?
Thank you
Yanuar





RE: Internal FLoating Roof Requirement
RE: Internal FLoating Roof Requirement
RE: Internal FLoating Roof Requirement
So basically its an option - only you hold the information as to whether this is a good option or an unnecessary cost...
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Internal FLoating Roof Requirement
We only have primary seal (rubber type) no secondary seal.
RE: Internal FLoating Roof Requirement
The fluid is condensate and we olan to use ponton type.
There is circulation vent will be installed on the tank.
I think we also wlwill use alumunium floating roof.
Another question, is iit mandatory the liquid directly contact to floating roof?
We keep some distance beetween liquid level and the floating roof..
Thank you
Yanuar
RE: Internal FLoating Roof Requirement
If you don't, it is not a conservation device, just an expensive sieve and serves no significant purpose.
RE: Internal FLoating Roof Requirement
It is not practical to bridge a floating roof across the entire tank, and it seems a little silly to have a bunch of pontoons scattered about the underside of the roof to keep it dry. And the underside will not be dry; the air trapped under the floater will be saturated with your product, and some will condense on the floater. And, because the floater is elevated, that area will remain oxygenated, giving a LOT of corrosion. "There is always a good reason why things are done they way that they have been done" If nobody else in the world has an air-gap under their floater, you probably should reconsider your idea.*
*I'm good; sometimes I'm extremely good, approaching brilliance. But I will never be as good as the combined knowledge, talents, and experience of the rest of the world.
RE: Internal FLoating Roof Requirement
How?? - anti gravity pads?
More importantly why? It seems to make little sense to go to the trouble and expense of a floating roof then have it not resting on the liquid surface where it significantly reduces vapourisation of the fluid
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Internal FLoating Roof Requirement
RE: Internal FLoating Roof Requirement
Sorry for unclear question.
To be honest.. I am new in designing the storage tank.
Attached vendor drawing from existing equipment.
There is a air gap between liquid level and the floating roof = half Dia. Of ponton.
I think,1st question is about the concept how to select type of internal floating roof as the starting point to design it.
Again.. Thank you very much for all the input.
Thanks
Yanuar