Flanged and flued vs bellows
Flanged and flued vs bellows
(OP)
Hi all,
Can anyone explain the difference between flanged and flued expansion joints and bellow type expansion joints. ASME sec VIII, Div.1, mandatory appendix 26 talks about bellows expansion joints while, in mandatory appendix 5, it talks about flanged and flued type expansion joints. If both of them are different, then I get confused when I find it written as flanged and flued expansion bellows on the internet.
Can anyone explain the difference between flanged and flued expansion joints and bellow type expansion joints. ASME sec VIII, Div.1, mandatory appendix 26 talks about bellows expansion joints while, in mandatory appendix 5, it talks about flanged and flued type expansion joints. If both of them are different, then I get confused when I find it written as flanged and flued expansion bellows on the internet.
RE: Flanged and flued vs bellows
A flanged and flued joint is a relatively thick expansion joint, usually made from two F&F heads. Usually a single convolution, usually the same material as the vessel shell cylinders. Accommodates only a small movement. Simple.
A bellows joint is a relatively thin joint, formed from sheet, many convolutions, usually high alloy or non-ferrous, accommodates larger movements. May be more than one ply. With stub ends, and optional features such as protective covers, shipping bars, etc, more complex
Rule of thumb: If you don't really need an expansion joint, use a flanged & flued. If you do, use a bellows :)
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Flanged and flued vs bellows
Can a flanged and flued head have more than one convolution??
RE: Flanged and flued vs bellows
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Flanged and flued vs bellows
It is for a vertical vessel of thickness 8 mm and design temperature 230 Deg C
Now, by drain and vent for every convolution, I assume that they are required to drain off any working fluid trapped in the flanged portion of the expansion joint?? And why is a vent required?
Moreover, a vertical vessel wont require these drain and vents for expansion joint convolutions??
RE: Flanged and flued vs bellows
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Flanged and flued vs bellows
Actually, the vessel is flanged to two vessels through nozzles located on their shells (one above and one below it). The expansion joint is there to cater the stresses that may arrive when sliding saddle of one of these vessels moves. So, the stresses resulting will come on this vertical vessel sandwiched in between. In order to cater these lateral stresses, expansion joint should be there
As per my research, flanged and flued are good for axial movements.
I want to ask if they can cater lateral stresses also?
RE: Flanged and flued vs bellows
Comments: In my opinion, traditional expansion joints are a poor choice to accommodate primarily lateral displacements. Designing a vessel for lateral displacement seems to me a poor choice as well. I'd think you would need to assure yourself the vendor knows what it's doing.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Flanged and flued vs bellows
RE: Flanged and flued vs bellows
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Flanged and flued vs bellows
https://www.macoga.com
Also have a look at EJMA:
http://www.ejma.org/EJMAStandards.htm