Piping to roof shall conform to the following:
1. Piping or tubing used to transfer heated material to the roof shall be Schedule 40 or equivalent. Flexible steel piping shall be of an approved type. Flexible piping shall not be used anywhere in the system except at the connection immediately adjacent to the pump or kettle and shall not exceed 6 feet in length.
2. Remote operated bypass valves used in a single supply line system shall be of a fail-safe type which opens automatically if the control line or lanyard fails.
3. All piping shall be firmly supported at not more than 12-foot intervals.