Inspecting of Walk-Through Arch Frame Scaffold

Today I carried out an inspection on walk-through arch frame scaffold exported to Canada.
My inspection focus on tube diameter and thickness, let's zeroing thickness gauge to get started!
I marked neighbor of going-to-be-inspected parts with Arabic numbers and A, B, C, D, E, F, and distinguish thickness with T1, T2, T3, T4.
From 1 to 8, is about diameter inspection of vertical tubes and horizontal main tubes. The vertical and horizontal main tubes should be φ42mm(1-21/32in), and after checking, all but 5 is positive tolerance, while No 5 is about 41.98mm, others are all above 42mm, like No 3 and No 6, and No 3 is even 42mm! right on the spot! and No 6 is 42.05mm, also good.
While No 8 is a little way above 42mm, is 42.45mm, and fortunately it is also positive, and I ask producing manager the reason, he told me the top horizontal tube is the one who bears most of selfweight of the frame, so it is better be thicker than others.
Coming next, rungs and inner vertical tubes. They are designed φ33mm(1-5/16in) , and results are B and E are negative, they are 32.74mm and 32.98mm, while D is best, 33.06mm, others are all positive.
Finally, we come to the thickness inspecting, drawing shows that thickness should be 2.5mm(5/64in). T3 is best, 2.50mm, while T4 is worst, only 2.40mm, and T1 2.58mm give or take, T2 2.54mm.
Feedbacks from customers is also positive, thickness and diameter tolerance are all acceptable with them. And we are glad to hear that, but not surprised, as we pay much for tubes rolling equipment to guarantee the quality of tubes applied into scaffolding producing, even we can outsource cheaper tubes for more profits, but that breaks our rules, we would not play the game when we are breaking the game rule.
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