DIN EN ISO 15758:2014-09

This standard specifies a method for calculating the density of the water vapour flow rate in cold pipe insulation systems, and the total amount of water diffused into the insulation over time. This calculation method presupposes that water vapour can only migrate into the insulation system by diffusion, with no contribution from airflow. It also assumes the use of homogeneous, isotropic insulation materials so that the water vapour partial pressure is constant at all points equidistant from the axis of the pipe. The standard is applicable to pipes inside buildings as well as in the open air when the temperature of the medium in the pipe is above 0 °C. The committee responsible for this standard is NA 005-56-10 AA "Dämmarbeiten an technischen Anlagen" ("Insulation work for industrial installations") at DIN.