About Pipes - Part 1

Pipes are generally made of  metal, plastic or concrete.

Metallic pipes are of Cast Iron, Galvanized Iron, Carbon Steel, Mild Steel, Stainless Steel, etc
Plastic Pipes maybe of PVC, HDPE, FRP etc
Concrete Pipes are made of various concrete mixes

Mettalic pipes maybe manufactured by extrusion (also called seamless pipes), centrifugal casting and spinning or welding.

Pipes generally are classified by their Nominal Bore which is their Outer Diameter and by Pipe Schedule which is the thickness of the pipe shell.

Pipes may be joined together by Welding, Flanging or Threading.

If pipe is joined by welding ( either Butt Welding or Socket Welding) then radiographic inspection of the welded joint would be required by the client.

If a mettalic pipe is to laid underground then the pipe must be protected from corrosion by wrapping and coating and also by cathodic protection.