The maximum temperature that galvanized pipe joints can withstand depends on several factors, including the thickness of the zinc coating, the duration of exposure to high temperatures, and the presence of any corrosive substances in the environment.
Galvanized coatings on steel pipes are typically composed of a layer of zinc, which melts at 787°F (420°C). Exposure to temperatures above this threshold can cause the zinc coating to deteriorate, leading to reduced corrosion protection and potential failure of the joint.
In general, galvanized pipe joints are not recommended for use in applications where the temperature exceeds 392°F (200°C) for extended periods of time. At higher temperatures, the zinc coating can begin to weaken, leading to the potential for leaks and joint failure.