Lap Joint Flange

The main structural feature of the stainless steel lap joint flange is the loose connection. It consists of a flange body, a flange nipple and connecting bolts. The flange body and the flange nipple are loose fitting, and this structure allows the pipeline to expand and contract freely within a certain range.

Slip ons in higher pressure classes are often made with the height of a lap joint for a better connection. If the hub height is not a concern and a lap joint is not readily available, customers will sometimes opt for a slip on made to a lap joint style with a machined hub.

Welding neck flange benefits

Usage of a weld neck flange

Materials of WN Flanges

What is a weld neck flange and what about its dimensions?

Class 300 LAPJ flanges are used with lap joint stub end.The pressures for ASME B16.5 forged flanges including 150LB,300LB,600LB,900LB,1500LB12500LB.

Stainless steel lap joint flange is always used with lap joint stub end (a kind of butt welded fitting).A182 F304 forged flanges have great anti-corrosive function,flanges in this material have longer using years than other materials.

Stainless steel 316L LAPJ flange has great anti-corrosive function,it always used with lap joint stub end of same material.ASME B 16.5 forged flange have soem pressures:CL150,CL300,CL600,CL900,CL1500,CL2500.You could find the comparison between LAPJ flanges,SO flanges and WN flanges below.