Introduction to Pipes and Tubes
The steel tubes and pipes industry caters primarily to the needs to flowing materials to desired distance under pressure and force. Every industrial complex or manufacturing unit usually needs a large amount of piping and plumbing to work with various types of fluids including water. It is the most often used product by the steel industry.
Manufacturing standards for pipes commonly require a test of chemical composition and a series of mechanical strength tests for each heat of pipe. A heat of pipe is all forged from the same cast ingot, and therefore had the same chemical composition. Mechanical tests may be associated to a lot of pipe, which would be all from the same heat and have been through the same heat treatment processes. The manufacturer performs these tests and reports the composition in a mill traceability report and the mechanical tests in a material test report.
High level of tensile strength and corrosion resistance has made the steel pipes a preferred option in the oil & gas industry – particularly in the exploration and production phase. Pipes have various specifications such as standard, grade, technique, outer dia, material, shape, thickness , surface etc.
Standard pipe is manufactured and tested as prescribed by ASTM (formerly American Society for Testing Materials) Line pipe and Oil Country products are manufactured and tested as prescribed by the American Petroleum Institute (API).The API operates similarly to the ASTM except that producers,consumers,and associations with primary interests in oil or gas are involved.
Difference between tubes and Pipes -Tubes can round, square and rectangular, measured by outside diameter and wall thickness whereas pipes are always round in shape and measured by inside diameter. Tube is generally used for structural purpose and specified by OD and exact number and are stronger than pipes. Pipes are categorized as tubular vessels used in pipeline and piping system and are typically available in large sizes then tubes.