The Process Piping Engineering is an integrated activity, involves, Design, Materials, Procurement, Fabrication, Inspection, Testing and Construction.

Various Engineering Disciplines and people from different engineering backgrounds work together in a project. With these many involvements, the decision making for a certain requirements in a project is way difficult in a system without guidelines and Bench Marks.

Essentially, it is necessary to standardize a common document with certain guide lines, so that all the professional individuals and institutions across the world shall follow one document. 

The Professional groups and experts all over the world have developed guidelines and requirements for their own country to standardize the engineering works. These standardized documents are known as Codes and Standards. 

However, ASME codes and standards are widely used all over the world. Few countries have their own codes and standards, and for other countries it varies with the requirements. 

What is Code?

Code is a group of general rules or systematic procedures for design, fabrication, installation and inspection that are adopted by legal jurisdiction and made into law. 

Code is a document which list out general guide lines and procedures for carrying out engineering activities.

Features covered

  • General Guide lines for Design, Materials, Fabrication, Erection, Inspection, and Testing
  • Minimum engineering requirements for safe design
  • Indicates reference standards

Examples of Codes:

  1. ASME BPVC – Boiler Pressure Vessel
  2. ASME B 31. 1 – Power Piping
  3. ASME B 31.3 – Process Piping
  4. ASME B 31.4 – Pipe Line Hydrocardon etc.

What is Standard?

Standards are the documents, prepared by a professional societies or committee, which are believed to be efficient engineering practices and which contain mandatory requirements. 

Standards are documents pertaining to specific requirement or components. It does not generalize the requirements.

Features covered

  • Rules and conditions for Design, Materials, Fabrication, Inspection, Testing , Examination, certification and packing.
  • Mandatory engineering practices and requirements.

Examples of Standards:

  1. ASME B16.5      – Steel Flanges
  2. ASME B 16.9     – Buttweld Fitting
  3. API 600            – Gate Valves
  4. API 609            – Butterfly Valves etc.

Difference between Codes and Standards:


Subash Chandran

Hi, I'm Subash Chandran, an aspiring piping design engineer with 15 years of experience and obsessed with piping design. This site is dedicated to educate the aspiring piping design engineers like me, to help them understand the knowledge required to work in live-projects. I will keep posting more contents about piping design and wish to build this platform to be useful for all engineers who wants to pursue piping design engineering.

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