Fusible Plug Safety Tips

How much do you know about the fusible plug on your steam traction engine?

Fusible plugs 3
Figure 3: A 3/4-inch fusible plug showing three modes of failure: The plug of scale could possibly withstand the pressure of steam if the tin melted; the filling did not melt when heated to over 1,000 degrees F and is completely converted to the matrix type of oxidation; the lower portion of the plug was filled with infusible crust, which crumbled when the plug was cut in two.