Interpretation of figure 3.5
Interpretation of figure 3.5
(OP)
We have B-L1a-F joints on a 304L hopper. There is a concern that the root openings may be excessive. I am trying to understand the fit-up tolerances in figure 3.5 of D1.6 (2007).
1/4" plate should have 1/4" root opening if detailed as such, plus 1/16" based on the equation? I question it because I am trying to understand where the less than or equal to comes into play. With a 3/8" max thickness limit, nothing would ever equal 1/4" so why not just say +T/4?
1/4" plate should have 1/4" root opening if detailed as such, plus 1/16" based on the equation? I question it because I am trying to understand where the less than or equal to comes into play. With a 3/8" max thickness limit, nothing would ever equal 1/4" so why not just say +T/4?





RE: Interpretation of figure 3.5
RE: Interpretation of figure 3.5
RE: Interpretation of figure 3.5
I am not much good at imperial but I will try.
3/8" is maximum thickness of material.
So if you have 1/4" thick material the root opening is 1/4" minimum.
As Detailed allows the root opening to be 5/16" max (1/4 + 1/16") / 1/4" min
As Fit-Up allows the root opening to be 9/16" max (5/16" + 1/4") / 3/16" min (1/4 - 1/16")
3.13.1 Joint Dimensions. Dimensions of groove welds
specified in 3.13 may vary on design or detail drawings
within the limits or tolerances shown in the “As Detailed”
column in Figure 3.4. Fit up tolerance of Figure 3.4 may
be applied to the dimension shown on the detail drawing.
Hope that helps,
Cheers,
DD