If you would go to the right side of the screen you will see "Search all of CR4" and type in the key words of your question you will find answers such as this from a previous question.
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The previous responder has made a number of points, all valid. Please consider them carefully.
I am going to make an assumption about the origin of your question.
I assume that you are talking about process plant piping. Is that
correct?
If so your post might have looked like this:
"I am in the Piping field and I would like to know the
definition of "Material Class" and "Pipe Wall Schedule" including when
to use one instead of the other."
- "Material Class" - This is also written Piping Material Line
Class Specification or just plain "Piping Material Specs". Piping
Material Specs are prepared for all commodities by pressure/temperature
breakdown found on a process plant project. The total Piping Spec might
have 20, 30 or more individual "Line Classes". Each "Line Class" might
handle one or more different commodities. Each "Line Class" includes a
definition of application, and a listing of all pipe, fittings,
flanges, valves, gaskets, bolts, and any other object necessary to
complete a piping system.
- "Pipe Wall Schedule" -This term has to do with the pipe and
fittings found in the "Piping Material Specs". Pipe used in a process
plant is designated by it's "Nominal" size. The "Nominal" size is NOT
the actual outside diameter of pipe 12" and smaller. The "Nominal" size
IS the actual outside diameter for 14" and larger sizes. The wall
schedule relates to the wall thickness of the pipe. Examples of pipe
wall schedule are: Sch 40, sch 80, sch 160, etc. The higher the
Schedule number the thicker the pipe wall. Because the outside diameter
of the pipe is fixed, the inside diameter decreases as the schedule
number increases.
You may also have been confused by another term used in piping.
- Flange Class - Flange Class relates to the Pressure/Temperature
Design conditions of Flanges. There are two ways flanges are
designated. In the USA we use word "Class" and a number such as Class
150, Class 300, etc. In other parts of the world the "PN" (Pressure
Designation) and a number is used, such as PN 25, PN 50, etc.
The cross reference of Class to PN is as follows:
Class 150 = PN 25
Class 300 = PN 50
Class 400 = PN 68
Class 600 = PN 100
Class 900 = PN 150
Class 1500 = PN 250
Class 2500 = PN 420
I hope I have guessed right and have given you the answers you need.
Description of material
Re: Description of material
