Certified Welding to API 1104 in Quebec: Requirements and Uses
October 8, 2025 6 min read
API 1104 governs fusion welding of transportation and refinery piping. Welder qualification, WPS and inspection: what it changes for the petroleum sector in Quebec.
Why API 1104 matters in the petroleum sector
API 1104 is the reference standard for fusion welding of transportation pipelines and the associated piping in oil and gas. In the petroleum sector — refineries, processing facilities and transport lines — a defective joint under pressure is not an option. The standard governs procedure and welder qualification, welding procedure specifications (WPS) and weld inspection methods.
For a plant manager or project engineer in Quebec, requiring API 1104-certified welding means the work meets the service and safety requirements of high-pressure piping.
Welder qualification and WPS
Every welder is qualified on a given process, position and diameter. The WPS sets the parameters, the filler metal and the preparation. Before production, a procedure and welder qualification suited to the material and position can be run. Weld traceability and joint identification let inspectors validate compliance and make audits straightforward.
Inspection and pressure testing
Weld inspection — visual inspection, identification, coordinating the required tests — comes before pressure testing. Well-executed piping means fewer leaks, fewer rework calls and fewer unplanned shutdowns, which matters even more in a refinery where every hour of downtime has a cost.
Planning a piping project in the petroleum sector? Get a free quote and we come back with a clear plan of work.
Industrial Welding & Piping
Get Your Free Quote
Tell us about your piping, welding or plant shutdown project. We come back with a clear quote and a clear plan of work.