3.1.3 Gray Cast Iron
Material specifications for gray cast iron (also called ordinary cast iron) are given in Section 2-3-11 of the ABS Rules for Materials and Welding (Part 2). Cast iron components should not be used in systems that are exposed to pressure shock, vibration or excessive strain. In general, gray cast iron pipes, valves and fittings may be used only in Class III piping systems. Specifically, gray cast iron is not to be used for the following applications: