ASME B31.1 & ASME B31.3: Major Differences

The course on Major difference b/w ASME B31.1 & ASMEB31.3 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.


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What you’ll learn in this course?

ASME B31.1 & ASME B31.3 are two codes which are almost the bible of piping industry. All process & Power plants has to follow the clauses mentioned in these codes.

Identification & discussion on

12 Major Differences between ASME B31.1 & B31.3
  • Application

  • Allowable stresses – (Two Steps)

  • Design Life

  • Factor of safety

  • Pipe wall thickness

  • Variation on Normal operation

  • Post weld heat treatment

  • Random Inspection & examination

  • Testing

  1. Hydrostatic test

  2. Pneumatic Test

  3. Service Test

FAQs: Frequently asked Questions

Following questions have been answered in detail in the course:

1.    What is the purpose of ASME B31 1?

ASME B31. 1 or Power Piping Code provides rules for piping typically found in electric power generating stations, in industrial and institutional plants, geothermal heating systems, and central and district heating and cooling systems

What is the difference between ASME B31 1 and B31 3?

Power Piping code ASME B31. 1 uses a maximum SIF of 2.0 for reducers while stress calculation. ASME B31. 3 uses a factor of safety of 3; relatively lower than ASME B 31.1.

What is the ASME B31 3?

ASME B31. 3 contains requirements for piping typically found in petroleum refineries; chemical, pharmaceutical, textile, paper, semiconductor, and cryogenic plants; and related processing plants and terminals

What is the difference between API 1104 and ASME B31 3?

API 1104 is a standard for the qualification of WPS and welders for oil and gas pipelines. ASME B31. 3 is a standard for the design and erection of chemical plant and oil refinery piping.

What does ASME stand for?

Founded in 1880 as the American Society of Mechanical Engineers, ASME is a not-for-profit professional organization that enables collaboration, knowledge sharing and skill development across all engineering disciplines, while promoting the vital role of the engineer in society.

What is ASME B31 4?

What is ASME B31. 4? Developed and maintained by ASME, ASME B31. 4 is the design code for pipelines transporting liquids and slurries between facilities, production, and storage fields, plants, and terminals, and within terminals and pumping, regulating, and metering stations associated with liquid pipeline systems.

What is the difference between ASME and ASTM?

Basically ASTM creates the material specifications and standard test methods to determine compliance. ASME selects those ASTM materials which will perform adequately in boiler or pressure vessel service and accepts them with stated limitations.

Which ASME standard is used for pressure vessels?

The ASME Boiler & Pressure Vessel Code (BPVC) is an American Society of Mechanical Engineers (ASME) standard that regulates the design and construction of boilers and pressure vessels.

What is API and ASME?

API – American Petroleum Institute – The American Petroleum Institute – API. ASME – American Society of Mechanical Engineers – ASME is one of the leading organizations in the world developing codes and standards.

Is ASME and ANSI same?

ANSI establishes and accredits performance and quality standards for products and services in a wide variety of sectors, while ASME is primarily focused on boilers and pressure vessels.

How many ASME codes are there?

It produces approximately 600 codes and standards covering many technical areas, such as fasteners, plumbing fixtures, elevators, pipelines, and power plant systems and components.

What is ASTM standard for pipe?

ASTM standards define the specific manufacturing process of the material and determine the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., and are indicated by “Grade”.

What is the minimum thickness for Pwht as per B31 3?

ASME B31. 3 2014 comes to be more stringent, less than 5mm, PWHT is required. More than 25 mm, PWTH can be exempted if preheat is conducted.

What is ASTM vs ISO?

ASTM is a national organization that is a part of ISO organizations. ISO is an international organization that has representations from all countries including ASTM. ISO establishes documents and updates the standards of testing materials with global consensus from the experts of the associated national organizations.

Does OSHA use ANSI?

Answer: A number of ANSI and other industry consensus standards have been adopted as OSHA requirements.

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 Major difference b/w ASME B31.1 & ASMEB31.3 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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