This information sheet on visual assessment of welded polyolefin pipes and fittings is used in connection with DS/INF 70-1 and forms part of the follow-up methods A - B - C.
DS/INF 70-3:1992 history
1992DS/INF 70-3:1992 Plastics pipes. Butt fusion of polyolefine pipe systems. Part 3: Visual inspection