Steel pipe is graded based on the ASTM (American Society for Testing Materials) standards and ASME standards. ASTM International is the company that issues the standards for most of the steel pipe manufactured and ASME generally issues standards for pressure bearing pipes.
ASTM is a large organization that develops standards for different materials which are manufactured and generally used in construction or industry. The organization is what is called a voluntary standards development company and they are independent of the manufacturers. Standards for each type of pipe can be downloaded or purchased in print from ASTM and several other website which host their documentation.
Steel pipe is manufactured in many different ways including seamless pipe, welded pipe, cast pipe. In addition, there are subcategories for each type of pipe. For instance there is single welded pipe, or diagonally (continuously welded pipes) made by welding the edges pf a single strip of metal wound like a curly-q into a cylinder shape. So, each standard is based in part on the type of manufacturing process that creates it.
Grading the Pipe
Pipe is graded is strength in terms of pressure. Each type of pipe is designated with a code like API5L PSL2. There are then many grades for each standard ASTM Code which determine a minimum yield strength and minimum tensile strength. The grades include grade 1, grade 2, grade 3, then grade A, grade B, grade C and continue on to grade X and there is minimum and maximum pressure rating each grade. For instance with API5L PSL2 grade 1 ASTM 252 pipe the minimum yield strength is 30,000 PSI and minimum tensile strength is 50,000 PSI.
Carbon Steel Pipes
Carbon steel pipes like regular steel pipes are graded using the same methods. The ratings include temperature and pressure levels for A106 Grade B carbon steel pipes, for instance. These pipes are generally classified under the ANSI/ASME standards codes.
Each pipe has this separate code based on the ANSI/ASME standards, for instance B 31.1. That is the ANSI code for a particular type of pipe. The grade then specifies how much pressure and the temperature the pipe is made to withstand.
How to Build a PVC Pipe Table
This will show you how to create a PVC pipe table with very minimal effort but with amazing results.
How to Lay Sewer Pipe
Laying sewer pipe involves setting the pipe into the ground, usually in a trench dug with an excavator. The sewer pipe can...
How to Figure Out the Percentage of Fall on a Sewer Pipe
The "fall" of a sewer pipe is defined as the vertical distance by which one end (or one end of a section)...
Grade of Copper Tubing Used in Hydronic Boiler Systems
Boilers do more than heat the water for your morning shower. In homes with a hydronic system, the boiler helps to heat...
Types of Potable Water Pipes
Potable water is carried to our homes through a system of pipes. Decades ago, water pipe was made of iron, but because...
Different Grades of Teflon Tape
The American Society of Testing and Materials (ASTM) guidelines state that a pipe sealant should be used on all threaded pipe joints,...
AISC Properties of Steel Pipe
In the United States, the American Institute for Steel Construction (AISC) develops market standards for the use of steel in construction. Regarding...
The Properties of Steel Grade X65
When it comes to specialized steels, often the most specialized are the tool steels with precise concentrations of rather exotic elements. However,...
ASTM A312 TP Specifications
Steel pipes are used in a wide variety of applications. From plumbing to ducts, steel pipe is an integral part of the...