Welding Procedure Piping Classification

Course Overview

This course provides participants with a comprehensive understanding of welding procedures and piping classifications in line with international standards such as ASME B31.3, ASME Section IX, and API codes. It covers how piping materials and service conditions influence welding procedure selection, qualification, and inspection. Participants will learn to prepare and interpret Welding Procedure Specifications (WPS), Procedure Qualification Records (PQR), and Welder Performance Qualifications (WPQ), while also gaining knowledge of piping classifications (critical vs. non-critical service, material groups, pressure ratings) and how they affect fabrication and inspection requirements.

Practical case studies and group exercises are included to strengthen understanding of real-world applications in oil & gas, petrochemical, power, and construction projects.

Course Objectives

By the end of this course, participants will be able to:

• Understand piping classification systems based on service, pressure, and materials.

• Interpret the relationship between piping classification and welding requirements.

• Prepare and review WPS, PQR, and WPQ in accordance with ASME IX.

• Identify essential, non-essential, and supplementary welding variables for piping applications.

• Select appropriate welding processes and consumables for various piping materials.

• Recognize weld joint designs and symbols used in piping fabrication.

• Apply inspection methods (VT, PT, MT, RT, UT) based on piping service class.

• Understand common welding defects in piping systems and their remedies.

• Integrate QA/QC practices, safety, and cost-effectiveness in piping welding projects.

Who Should Attend

This course is intended for:

• Welding engineers and inspectors

• QA/QC personnel in piping and fabrication projects

• Piping engineers and supervisors

• Fabrication and maintenance engineers

• Project engineers and managers in oil & gas, petrochemical, and power sectors

• Third-party inspectors and surveyors involved in welding and piping inspections

Daily Course Outlines

Day 1: Fundamentals of Welding & Piping Systems

• Introduction to piping systems and classifications (critical / non-critical, service classes)

• Overview of codes and standards: ASME B31.3, ASME Section IX, API 1104

• Materials of construction in piping: carbon steel, low alloy, stainless steels, dissimilar materials

• Safety precautions in piping welding and fabrication

• Basics of welding metallurgy for piping

Day 2: Welding Procedures & Documentation

• Welding procedure requirements for piping fabrication

• Welding Procedure Specification (WPS): contents and preparation

• Procedure Qualification Record (PQR): documentation and testing requirements

• Welder Performance Qualification (WPQ) for piping welders

• Essential, non-essential, and supplementary welding variables in ASME IX

• Case study: Reviewing WPS and PQR for piping project compliance

Day 3: Piping Welding Processes & Consumables

• Overview of piping welding processes: SMAW, GTAW, GMAW, FCAW, SAW

• Welding of different piping materials (carbon steels, alloy steels, stainless steels, exotic alloys)

• Welding of dissimilar piping materials (transition joints, cladding, overlays)

• Consumables selection and classification (ASME, AWS standards)

• Weld joint design and piping welding symbols

• Workshop: Matching consumables to piping material & class

Day 4: Inspection & Quality Control in Piping Welding

• Piping weld inspection requirements based on service class and code

• Visual inspection (VT) of piping welds

• NDT methods in piping: PT, MT, RT, UT – applications and acceptance criteria

• Welding defects in piping systems: identification, causes, and remedies

• QA/QC documentation, traceability, and piping weld maps

• Case study: Inspection of piping welds in a refinery project

Day 5: Advanced Topics, Case Studies & Wrap-Up

• Welding procedure considerations for high-pressure / high-temperature piping

• Piping classification and risk-based inspection requirements

• Repair and rework welding on in-service piping

• Welding audits and compliance in piping projects

• Case studies:

  • Critical piping weld failure and lessons learned

  • Developing WPS/PQR/WPQ for different piping classifications

• Final review, group discussion, and course assessment