Pipe thickness calculations (ASME B31.3)

The course on Pipe thickness Calculations & Allowable has been developed to explain the fundamentals of Piping Engineering in a particular project in detail. The content is organized in a systematic manner so that the first timers can also understand. Course content is based on practical problems and solutions, which is created by experienced professionals with decades of experience in the relevant field.

Please Note: Few courses have been Published on Udemy platform which is learning management system (LMS) and designed for online courses. Click to check the available courses.

The purpose of this article is to give answers to the basic questions about the course which commonly comes into the mind before enrolling to the published courses. So Let’s begin with details and look at various sections of the article.


What you’ll learn in this course?

•What is pipe

•Understanding the Pipe schedule

•Relationship between outer, inner diameters w.r.t. Pipe wall thickness.

•Why always minimum thickness is desirable?

1.Dimensional standards for Carbon & stainless steels (ASME 36.10 & 36.19)

•Understanding the Standards

•Total scope covered in standards

2.Pipe wall thickness Calculation as per ASME B31.3 (Class conditions & Line Conditions)

•What are various inputs required to start calculating pipe thickness?

•Where do we get the inputs from?

•Understanding Co-relation between Various ASTM Standards

•Understanding the PT rating concept w.r.t ASME 16.5

•Understanding the Allowable stresses, Tensile stress & Yield Stress w.r.t Stress-strain diagram

•Unit system used while referring code & standards while calculating wall thickness?

•Actual Pipe wall thickness calculations (4” Carbon steel)

•Pipe wall thickness calculation based on line conditions given in Line list.

FAQs: Frequently asked Questions

Following questions have been answered in detail in the course:

What is ID and OD of pipe?

The outside of the pipe is always larger than the inside. The difference between the inside diameter (ID) and the outside diameter (OD) is due to the thickness of the wall.

What is the thickness tolerance in pipe?

The most common tolerance on the wall thickness of straight pipe is 12.5%. This means that the wall thickness at any given location around the circumference of the pipe must not be less than 87.5% of the nominal wall thickness.

What is required thickness?

The minimum thickness without corrosion allowance for each element of a pressure vessel based on the appropriate design code calculations and code allowable stress that consider pressure, mechanical, and structural loadings.

What unit is thickness?

A “mil” is a unit of thickness equal to one thousandth of an inch (. 001 inch). To convert mil to inches, take mil and divide by 1000.

What is minimum required thickness?

The thickness without corrosion allowance for each component of a piping system based on the appropriate design code calculations and code allowable stress that consider pressure, mechanical and structural loadings.

Is pipe sized by ID or OD?

Tube is measured by outside diameter, pipe is measured by inside diameter.

How do you calculate percent thickness?

t = P * D / (2 * F *S * E)

  1. t : Calculated Wall thickness (mm)
  2. P : Design pressure for the pipeline (kPa)=78 bar-g=7800 KPa.
  3. D : Outside diameter of pipe (mm)= 273.05 mm.
  4. F : Design factor = 0.72.
  5. S : Specified Minimum Yield Strength (MPa)=359870 KPa for the specified material.
  6. E : Longitudinal joint factor = 1.0
What is STD in piping?

In pipes engineering, STD refers to standard thickness. Each pipes was produced to have one thickness that was later termed as STD. Schedule STD Steel Pipes is available in extra strong (XS), extra heavy (XH), double extra strong (XXS), and Double extra heavy (XXH).

What is ASME B36 10M?

B36.10M Welded and Seamless wrought steel pipe

This standard covers the standardization of dimensions of welded and seamless wrought steel pipe for high or low temperatures and pressures.


What is ASME B36 19m?

This Standard covers the standardization of dimensions of welded and seamless wrought stainless steel pipe for high or low temperatures and pressures. The word pipe is used, as distinguished from tube, to apply to tubular products of dimensions commonly used for pipeline and piping systems.

Why is it called Schedule 40?

Why is it called schedule 40 pipe? The pipe numbers are non-dimensional. In other words, SCH 40 doesn’t mean the pipe is 40 millimeters or 40 inches in diameter. The parameters for each schedule are determined by the ASME B36

Which is thicker Schedule 80 or Schedule 40?

The major difference between schedule 40 and schedule 80 pipe is the wall thickness, inside diameter, and their weight. Schedule 80 will have a greater wall thickness, a smaller inside diameter and a higher weight than Schedule 40 pipe at a given nominal pipe size.

What is the duration of course

Total duration of the course is 1 hour. However, it is recommended to watch the lecture at least thrice, so that the fundamentals covered can be easily grabbed.

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Recommendations to proceed further

  • It is highly recommended that watching all the lecture continuously in a single sitting should be avoided. 
  • Prepare a schedule of 1-2 hours on daily basis.
  • Write down the learning in short or in the form of your own notes 
  • List out the queries or doubts and share at Forums of Engineers Land.
  • Join Telegram group and register to keep yourself updated with the latest published content on EPCLand and Engineers Land.

Top Benefits of Piping Engineering course

  1. Lifetime access once enrolled
  2. Same lecture can be watched as many times as you want
  3. Flexibility of time and location
  4. Readymade notes which can be referred before interviews and working on live projects
  5. Become part of professional communities on Telegram & Engineers Land. 

Prerequisites of this course

  1. Willingness to learn
  2. Complete clarity on where you see yourself after 3-5 years
  3. Awareness of Energy sector (Click here to read about Scope of Piping Engineers)

How to be an expert in piping engineering

Recommended courses (Published on EPCLand):

  1. Basics of Piping Engineering
  2. Piping Layout Engineering
  3. Piping Material Engineering 
  4. Material Requisitions 
  5. Piping Material Specifications
  6. Piping Stress Analysis
  7. Complete Course on Piping Engineering
Please Note: Few courses have been Published on Udemy platform which is learning management system (LMS) and designed for online courses. Click to check the available courses.

Don’t miss 7 Free courses available for Enrolment

Along with the above mentioned recommend courses, there are 7 free course which available on EPCLand platform. These courses are just published so that the candidates can get use to the interface of EPCLand and get a feel how the lectures are available and organised on this platform. Following are the links to the free courses:

  1. Email Etiquettes: Professional Writing
  2. Piping Engineering: Fundamentals and Q&A
  3. Introduction to Process Industry
  4. Microsoft Teams: Various Tools & Features
  5. MS-Excel: Basics & Advance Excel Tips
  6. All about Valves: Classification & Types
  7. Cover letter for Jobs II Do’s & Don’ts

Recommended YouTube Playlists

  1. 2 minutes FundasSeries: Explains hundreds of Piping Engineering fundamentals in less than 2 minutes
  2. Piping questions and answers: It talks about various Questions & Answers to understand the engineering fundamentals
  3. Piping Engineering Interview preparation: This Section talks about the various questions which are generally aske during interviews
  4. Subscribe YouTube Channel:  Highly recommended to subscribe the Oil and Gas Fundas YouTube channel for various updates

To conclude, this article talks about the course details on Pipe thickness Calculations & Allowable explaining what is covered and how to approach after Enrollment. Moreover, it explains how to be part of various professional communities related to piping engineering where candidates can join various ongoing discussions and share the queries.

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Quiz Section

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