Structural design and detailing shall be considered to produce a structure of modern appearance without any pockets that will hold dust or water. The design shall minimize welded or other connections that can produce stress concentrations.

For individual member designs, rolled shapes or heavy-duty tubular sections will be preferred. Any built-up sections of angles or channels shall be spaced to enable easy inspection and maintenance of all surfaces. Sections shall not be connected to form battened or starred struts.

Irrespective of load carrying requirements, all welds shall be continuous and form fully sealed joints. The ends of tubular or other hollow sections shall be completely sealed.

The structure shall be designed so as to easily facilitate maintenance and painting. All non-hermetically sealed sections shall be accessible for inspection. 

Access holes shall be minimized. Any detail deemed to require holes for assembly shall be shown on the shop drawings for approval prior to fabrication.

For fillet welded details the fillet weld shall be returned through the hole to meet the fillet weld on the other side of the plate.

For complete penetration weld details, care must be taken to ensure acceptable weld profiles inside the hole.

The hole shall be dressed to the same finish as for plate edges.