30 CFR §75.1101-15

1. (a)Each self-contained dry powder system shall be equipped with hose or pipe lines which are no longer than necessary.
2. (b)Metal piping and/or hose between control valves and nozzles shall have a minimum bursting pressure of 500 p.s.i.g.
3. (c)Hose shall be protected by wire braid or its equivalent.
4. (d)Nozzles and reservoirs shall be sufficient in number to provide maximum protection to each belt, belt takeup, electrical controls, and gear reducing unit.
5. (e)Each belt shall be protected on the top surface of both the top and bottom belts and the bottom surface of the top belt.