Header and Header Trench Construction - Accessible Header Trench
The preferred method of installation is to install a header trench outside the ice surface with removable covers. This permits service procedures to be carried out in the event of leaks or blockages. The addition of a header trench will increase the initial cost of the facility but will pay for itself with the ease of repair of just one problem. When headers are installed in an external trench it is important to provide frost protection in the viewing area to minimize a slip hazard. When PVC headers are installed in an accessible header trench there is approximately a 1% power penalty due to heat gain through the header. To insulate the headers is not usually cost effective. The money would be better spent elsewhere in the system.