What is the maximum internal temperature allowed when heating air to dry cylinders during tests?

The maximum internal temperature allowed when heating air to dry cylinders during tests is set to ensure safety and integrity of the cylinders. A temperature of 150 degrees Fahrenheit is considered an upper limit that effectively facilitates the drying process without risking damage to the cylinder's material or structural integrity. Heating beyond this temperature could lead to potential deformation or weakening of the cylinder walls, compromising their ability to safely contain pressurized contents.

Furthermore, fire extinguisher cylinders are constructed with specific materials that have defined temperature tolerances. Exceeding 150 degrees increases the risk of adverse reactions or conditions that could endanger personnel and diminish the performance and safety of the extinguishing equipment. Thus, adhering to the 150-degree guideline is essential for maintaining compliance with safety standards and ensuring the reliability of portable fire extinguishers.