flat flange is essentially a ring that is placed over the pipe end , with the flange face extending from the end of the pipe by enough distance to apply a weld bead on the inside diameter , the outside diameter of flat flange is also welded on the back side of the pipe flanges ,Flat flange because of easy access to raw materials, manufacturing simple, low cost, so widely used, large sales.

Slip on pipe flanges are joined, generally both outside and inside, to offer potency and stop leakage. Slip on pipe flanges can at times as well have a ring/boss or a focal point, and can be made up by means of a bore to go well with either tube or pipe.Meanwhile, hub pipe flanges and ring pipe flanges are both believed as slip on pipe flanges, for the reason that they both slip above the pipe.

Standard:ANSI DIN,GOST,JIS,UNI,BS,AS2129,AWWA,EN,SABS,NFE ect
Size:DN10~DN5000
Material:stainless steel carbon steel,alloy steel,titanium
Pressure: DIN:PN6 PN10 PN16 PN25 PN40; ANSI:class150,300,400,600,900,1500,2500;
JIS: 5K, 10 K, 16 K 20 K,30 K,40 K, 63 K;
Surface treatment:Anti-rust oil,transparent/yellow/black anti trst paint,Zinc,hot dipped galvanized
Connect Type :Raised Face(RF), Flat Face(FF), Ring Type Joint(RTJ), Lap-Joint Face(LJF), Large Male-Female(LMF), Small Male-Female(SMF), Large Tongue & Groove, Small Tongue,Groove