Indian standard Pipe IS 1239 PART 1

IS 1239 (Part 1) is the definitive Indian Standard for Mild Steel Tubes, Tubulars, and Other Wrought Steel Fittings, specifically engineered for the conveyance of fluids such as water, gas, air, and steam. Unlike structural-grade pipes, these tubes are prioritized for their pressure-bearing integrity and are a staple in both domestic plumbing and heavy industrial utility lines.

The standard classifies pipes into three weight categories based on wall thickness, which are easily identified by color-coded markings:

• Light Class (Yellow): Used for low-pressure air and water applications.

• Medium Class (Blue): The industry standard for residential plumbing and general-purpose gas lines.

• Heavy Class (Red): Designed for high-pressure environments, such as steam lines and specialized industrial machinery.