W elded Connections to Outer TankAll connections to the outer tank shell or roof, such as stairway treads, shall be completely seal-welded.3.4.16Hot Dip Galvanizing of Structural ComponentsPlatforms, walkways, ladders, stairs, and lifting davits shall be hot dip galvanized.3.4.17Ice Catcher for Vent LineIce catcher shall be installed per Figure 6.