What is P number in piping?

What is P number in piping?

Base Metals: The P Number This number is used to group similar Base Metals, allowing qualification of an entire selection versus qualification of just one. These base metals are grouped by material and assigned P Numbers based on what material they are.

What is P NO and group no in ASME?

The ASME grouping is made using the alphanumeric designation P-No for the base metal and F-numbers (F-No) for the filler material. This grouping is based on comparable characteristics of the material such as weldability, mechanical properties and composition.

What P number is 4130?


SAE grade Cr P, max.
4120 0.40–0.60 0.035
4121 0.45–0.65 0.035
4130 0.80–1.10 0.035
4135 0.80–1.10 0.035

What does the F stand for in welding?

In this position, the molten metal is drawn downward into the joint. The result is a faster and easier weld. In 1G and 1F, the number 1 refers to the flat position, while the letter G stands for a groove weld and letter F stands for a fillet weld.

What do you need to know about P number in welding?

In addition, you can find minimum specified tensile strength, group number, UNS number, ISO 15608 Group number, nominal composition and product form. P number is essential variable for most welding process. Similarly it is an essential variable for welding performance qualification.

When to not consider group number in welding?

In this example, when you are preparing your welding procedure specification and procedure qualification record, you should not consider the group number. Consider, no group number exists. The entire supplementary essential variable will be nonessential variables in your WPS form.

Do you have to qualify for P no groups?

The general question -Do I have to qualify the alloy (within a certain P no and Group) with maximum strength in order to use the qualified WPS for any alloy within the same Group? Now let’s make this bit more complicated. I want to weld A202 Class B to the same. The minimum tensile strength specified is 85 ksi and this is an as-rolled plate.

How to get a f number in welding?

The ASME Section IX Training Course is 2 days video training course and available online and the student that successfully pass the exam, receive I4I academy certificate with 16 hours training credit. F Number, A number, Nonessential Variable, Supplementary Essential Variable, Pressure Vessel Inspection

Share this post