What is the maximum temperature of the boiler metal during a hydrostatic test?

During a hydrostatic test, the primary purpose is to verify the integrity and leak-tightness of the boiler. The test involves filling the boiler with water and pressurizing it above its normal operating pressure to check for any weaknesses or defects in the material.

The temperature of the water used in a hydrostatic test should be kept reasonably low to avoid causing thermal stresses in the boiler metal that could lead to unintended distortions or damage. The maximum temperature of 50°C is established as a safe standard for these tests, as it minimizes the risk of causing any significant thermal effects on the boiler structure while still allowing for clear observation of the test results, such as leaks.

Values higher than this, such as 70°C or 100°C, would increase the risk of thermal expansion affecting measurement accuracy and might introduce safety hazards. Therefore, keeping the test water at or below 50°C is essential for ensuring the reliability of the test results and the safety of the boiler system.