If wind girders are required for the outer tank shell, they shall be located on the inside surface.3.4.10The outer tank shall have four stainless steel grounding/earthing bosses, 24 mm diameter x 40 mm long, tapped M10 for a minimum depth of 25 mm.Options for Enhancements3.4.11Outer Tank Anchor BoltsIf the outer tank is secured with anchor bolts, the anchor bolts shall have a positive locking mechanism for the nut on the bolt, such as a locking nut.