Are full-flat flanges still in use nowadays?
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Are full-flat flanges still in use nowadays? It seems that RF is used for those at normal pressure?
FF flanges should still be useful, but they seem to be very rare; those used under low pressure might work.
Yes, we produced a batch of FF products for customers this year as well
Standard SH/T 3059-2012/7.3.1(C) for the selection of materials for pipelines in the petrochemical industry stipulates that plate face welding flanges (PL) shall not be used for toxic and flammable media; this is because plate face welding flanges have poor stiffness, tend to deform during welding, and are also prone to deformation under bolt tension, which can cause the sealing surfaces to shift and lead to leaks. ) A flange with a neck for butt welding or socket welding should be used.
There are few FF sealing surfaces, but they are useful nonetheless.
Yes, there are low-pressure water pipes in areas where leaks are not a concern
Yes, for water projects, non-metallic flanges are used
These are the recommended standards; we are not obligated to follow them. For all our flammable and explosive materials, we use PL flanges
Flat welding flanges are used less frequently; they are still employed in simple low-pressure water treatment applications