Corrosion monitoring in a fire sprinkler system

A water-based fire sprinkler system comprising:

• a water source;
• one or more sprinkler heads;
• a corrosion monitoring device positioned in a flow path between the water source and the one or more sprinkler heads, the corrosion monitoring device including a first pipe having opposite ends and a middle portion including a wall having a first wall thickness, a structure coupled to the first pipe and defining a sealed chamber between said wall of the middle portion and the structure, and a sensor to sense a pressure in the sealed chamber, the opposite ends of the first pipe each including a wall having a second wall thickness at a location spaced from where the structure is coupled to the first pipe;
• and
• a second and a third pipe coupled to the opposite ends of the first pipe, the second and third pipes each including a wall having the second wall thickness;
• wherein the second wall thickness is greater than the first wall thickness;
• wherein the first, second and third pipes each have the same inner diameter;
• wherein the first, second and third pipes are each rigid pipes comprising black iron or galvanized steel;
• wherein the first wall thickness is about 20-30 mils;
• and
• wherein a change in the pressure in the sealed chamber corresponds to a breach of said wall of the middle portion due to corrosion and is indicative of corrosion damage in the second and third pipes of the water-based fire sprinkler system.