Which industry will use Pipe bend,  elbows, U type Bend and Socket & Threaded ?

Usually Pipe Bend and elbows etc pipe fitting used for all walks of life.

Ourarticle has been widely used in pipe works of Petroleum, Oil & Gas,Chemical, Electric power, Water Treatment, Refinery, Shipbuilding, etc. 

So Honda pipe bend and elbows pipe fitting use the range is very widely.