BS EN ISO 15758:2014

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Calculation formulae
5 Boundary conditions
6 Calculation procedure
Annex A (informative) - Examples
Annex B (informative) - System with capacity for
        drying and experimental determination of
        evaporation rate from surface of wet wick
        fabric
Bibliography

Provides 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 International 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. The 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.

This International Standard is applicable when the temperature of the medium in the pipe is above 0°C. It applies to pipes inside buildings as well as in the open air.