Out of standard pipes wall thickness is used to represent a value which is equal to the minimum allowable wall thickness at any point.

NPS is the representation of Out of standard pipes. NPS pipe system components for Reducing the size of letters and numbers identified, which consists of letters and numbers followed by the non-dimensional figure with the end of the connector specifications(in inches, code-named in) directly related to characteristics such as size.

DN is the nominal size (or nominal diameter) that is Out of standard pipe system components for the letters and numbers the size of the logo, which consists of letters and followed by the dimensionless numbers, the number and end connectors diameter and outer diameter (in mm) is directly related to characteristics such as size.

In other words, the pipeline equipment industry at least 30 to 50 years of strategic opportunities.

Out of standard pipe has big market in the future of  50 years in application of Industrial construction, Ship building,Printing,Petroleum industrial,Pipeline area.

SHEAN 's Out of standard pipe will beak away from a truth that a project requires bulk of Out of standard pipe,due to poor market supply,could only use standard pipe to instead of Out of standard pipe,but cannot get quite satisfied result.