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RF FLANGE VS FF FLANGES
- CCCENTER
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14 years 3 months ago - 14 years 3 months ago #7735 by CCCENTER
RF FLANGE VS FF FLANGES was created by CCCENTER
Is there a difference in the face to hub dimension of a RF weld neck flange and a FF weld neck flange. Is a FF flange a RF with the 1/16 face ground off?
I was asking if a FF flange was a RF with the RF ground off, or does the flange start as a FF then you remove the outer ring to make it a RF. We are only talking about a 1/16" in most cases but as you move up in pressure rating the Rf becomes 1/4".
I was asking if a FF flange was a RF with the RF ground off, or does the flange start as a FF then you remove the outer ring to make it a RF. We are only talking about a 1/16" in most cases but as you move up in pressure rating the Rf becomes 1/4".
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- Jop
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14 years 3 months ago - 14 years 3 months ago #5606 by Jop
Do it once and Do it Right
Replied by Jop on topic Re: RF FLANGE VS FF FLANGES
No!
A RF flange is a FF with the 1/16 face ring ground
A RF flange is a FF with the 1/16 face ring ground
Do it once and Do it Right
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- 11echo
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14 years 3 months ago - 14 years 3 months ago #5608 by 11echo
Replied by 11echo on topic Re: RF FLANGE VS FF FLANGES
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14 years 3 months ago - 14 years 3 months ago #5620 by CCCENTER
Replied by CCCENTER on topic Re: RF FLANGE VS FF FLANGES
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- 11echo
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14 years 3 months ago - 14 years 3 months ago #5618 by 11echo
Replied by 11echo on topic Re: RF FLANGE VS FF FLANGES
I would say YES! ...I don’t think there is much call for a flat face steel flanges in quantity, so there is no reason for flange manufactures to stock pile “flat face†steel flanges, when the operation to machine off a raise face into a flat face condition is too easy to do. So any manufacture would just fabricate(machine off the raised face) any flat faced flange orders as required. …My $0.02!
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14 years 1 week ago - 14 years 1 week ago #5104 by 2ndMoment
Replied by 2ndMoment on topic Re: RF FLANGE VS FF FLANGES
I thought I would resurrect this post and do my bit at flogging the dead horse...
The common question which has been asked is: "Are raised faced flanges standard and turned into a flat face or are flat face flanges standard and turned into raised face?"
ASME B16.5 States:
In essence, flanges are specified as standard raised face, as the B16.5 considers the additional raised portion an addition (or redundant) to the minimum required flange thickness (tf). If a designer happens across a flat face flange on site or in the shop; seemingly new and unblemished, the default is to assume that it already represents the minimum required thickness for the respective class #.
The common question which has been asked is: "Are raised faced flanges standard and turned into a flat face or are flat face flanges standard and turned into raised face?"
ASME B16.5 States:
In essence, flanges are specified as standard raised face, as the B16.5 considers the additional raised portion an addition (or redundant) to the minimum required flange thickness (tf). If a designer happens across a flat face flange on site or in the shop; seemingly new and unblemished, the default is to assume that it already represents the minimum required thickness for the respective class #.
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