Good morning
We have a doubt concerning a change in penstock thickness. Here is the sequence from uphill to downhill:
Diameter: 102"
Lenght: 209ft
Thickness: 36,51mm
Slope: 24°
Then an bend
Diameter: 86"
Lenght: 177ft
Thickness: 31,75mm
Slope: 20°
Then a trifurcation and then the Power...
Ok. I indicated the inspector that with 3G and 4G welder qualifications we´re fine and ready to go. But now he's asking why there are 6G qualifications for pipes over 24in of diameter on table QW461.9?.
Let me see if I can explaing myself. He's asking if there's a diameter limit in which over...
Thank you all for your precious points of view.
The solution was right there on qw461.9!...
“Engineers like to solve problems. If there are no problems handily available, they will create their own problems.” Scott Adams
Thanks for your opinions. Here are your answers:
ColonelSanders: You´re right, we are regulated here with AWS D1.1 and ASME section IX codes. I have both right here.
Racookpe79: The penstock is already on its field final position when have to weld it, so we cannot rotate it. The penstock is...
Good morning.
We are welding 8ft diameter penstocks, 1-7/16" thick, with SMAW, in a 35° slope. We have K-type bevels so we have to weld externally and internally.
Our inspector is requesting 6g certified welders, but we have only 4g welders.
Does a 3g and 4g welder are certified to weld this...
