Thermo-12® Gold Calcium Silicate Pipe and Block Insulation can be used on operating systems that reach as high as 1200° F (650°C).To ensure protection for workers on the job, the system or project designer needs to calculate the correct thickness for the insulation to achieve a safe-to-touch environment.
Johns Manville Industrial Insulation Group provides a set of tables for guidance on the minimum insulation thickness required to maintain an outside surface temperature at or below a desired level — with one-inch thickness as the baseline. The tables were generated using the NAIMA 3E-Plus computer program, which follows the heat-transfer calculation methodology in ASTM C680.