Parksuchul
Mechanical
- Jul 7, 2014
- 3
Hello,
as mentioned on API620 5.14.5
5.14.5 Each opening in the walls of a tank shall be located so that the distance between the outer edge of its reinforcement and any line of significant discontinuity in the curvature of the tank walls (such as the juncture between two nodes in a noded surface, the juncture between a dished or conical roof or bottom and cylindrical sidewalls, or the juncture between a roof or bottom and cylindrical sidewalls, or the juncture between a roof or bottom knuckle and other portions of the tank) is not less than 6 in. or (if this be larger) eight times the nominal thickness (including corrosion allowance; if any) of the wall plate containing the opening, except as permitted by 5.14.3. No part of the attachment for any openings shall be located closer than the larger of these distances to any part of the attachment for any lugs, columns, skirts, or other members attached to the tank for supporting the tank itself or for supporting important loads that are carried by the tank. When any two adjacent openings are reinforced independently of each other, they shall be spaced so that the distance between the edges of their respective reinforcements will not at any point be less than the larger of the foregoing specified distances (see 5.17).
Now, my project QC person is insisting that shell or roof plate weld seam to nozzle pad is belongs to above bold text "such as the juncture between two nodes in a noded surface". but I cannot give the detail of the meaning of juncture between two nodes in a noded surface.
1. anybody can give me the drawing or example of this nodes?
2. plate weld joint on the shell such as "T"joint(cir - ver seam cross section) can be "juncture between two nodes in a noded surface"
I am focusing significant discontinuity, I am thinking that shell of roof weld joint is not nodes...
as mentioned on API620 5.14.5
5.14.5 Each opening in the walls of a tank shall be located so that the distance between the outer edge of its reinforcement and any line of significant discontinuity in the curvature of the tank walls (such as the juncture between two nodes in a noded surface, the juncture between a dished or conical roof or bottom and cylindrical sidewalls, or the juncture between a roof or bottom and cylindrical sidewalls, or the juncture between a roof or bottom knuckle and other portions of the tank) is not less than 6 in. or (if this be larger) eight times the nominal thickness (including corrosion allowance; if any) of the wall plate containing the opening, except as permitted by 5.14.3. No part of the attachment for any openings shall be located closer than the larger of these distances to any part of the attachment for any lugs, columns, skirts, or other members attached to the tank for supporting the tank itself or for supporting important loads that are carried by the tank. When any two adjacent openings are reinforced independently of each other, they shall be spaced so that the distance between the edges of their respective reinforcements will not at any point be less than the larger of the foregoing specified distances (see 5.17).
Now, my project QC person is insisting that shell or roof plate weld seam to nozzle pad is belongs to above bold text "such as the juncture between two nodes in a noded surface". but I cannot give the detail of the meaning of juncture between two nodes in a noded surface.
1. anybody can give me the drawing or example of this nodes?
2. plate weld joint on the shell such as "T"joint(cir - ver seam cross section) can be "juncture between two nodes in a noded surface"
I am focusing significant discontinuity, I am thinking that shell of roof weld joint is not nodes...
