A large Coal fired power plant was upgrading / replacing the pumps in their flue gas desulfurization (FGD) system. The FDG system is designed to remove sulfur dioxide from flue gas as part of stringent environmental emissions regulations. When the facility began replacing their pumps they realized the competitors’ natural gum rubber expansion joints were showing signs of degradation despite being less than 5 years old. They had planned to reinstall the original expansion joints with the new pumps, but after an examination they quickly determined that they needed to be replaced.