Piping Classification

After we talk about Pipe Size, Pipe Wall Thickness and Piping, now we entering The Piping Classification, which mean that we will explain about the Classification of Piping according ASME Standards and this is Piping & Fabrication will start.

Piping Classification

PIPING CLASSIFICATION
It is usual industry practice to classify the pipe in accordance with the pressuretemperature rating system used for classifying flanges. However, it is not essential that piping be classified as Class 150, 300, 400, 600, 900, 1500, and 2500. The piping rating must be governed by the pressure-temperature rating of the weakest pressurecontaining item in the piping. The weakest item in a piping system may be a fitting made of weaker material or rated lower due to design and other considerations. Table A1.2 lists the standard pipe class ratings based on ASME B16.5 along with corresponding pression nominal (PN) rating designators. Pression nominal is the French equivalent of pressure nominal.

Pipe, Pipe Size and Pipe Wall Thickness

Pipe

In the previous posting I promise to write about Piping System and Fabrication as full detail as I can, and here it is the article that I promise to all of you.

PIPING
Piping includes pipe, flanges, fittings, bolting, gaskets, valves, and the pressurecontaining portions of other piping components. It also includes pipe hangers and supports and other items necessary to prevent overpressurization and overstressing of the pressure-containing components. It is evident that pipe is one element or a part of piping. Therefore, pipe sections when joined with fittings, valves, and other mechanical equipment and properly supported by hangers and supports, are called piping.

Pipe
Pipe is a tube with round cross section conforming to the dimensional requirements of :
-    ASME B36.10M Welded and Seamless Wrought Steel Pipe
-    ASME B36.19M Stainless Steel Pipe