Q. When running my recent PQR, I thought the dairy tube was 1.65mm wall thickness - but when measured it is actually 1.5mm wall, will this cover us to weld 2mm wall tubes?
A: No it won't cover 2mm wall tubes. As this was a single run weld, Table 5 of BS EN ISO 15614-1:2004 + A2:2012 states that the range of approval for material thickness of 3mm or below will range from 0.7t (where t is material thickness) to 1.3t. So based on your wall thickness of 1.5mm, you will gain a range of 1.05mm to 1.95mm.
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Harris Pye Engineering Ltd
Geoff Magaskil, JT Price