d. Liquid Level Indicators. Each tank should be equipped with positive
liquid level indicators with readout at the control station.
e. Pressure Interlock. Waste water tank drain valve should have a
pressure interlock to prevent opening under high pressure and exhausting high
pressure gasses into municipal sewer lines.
f. Mixing Valve. The shower should have a mixing valve to prevent
accidental scalding of the PV occupants.
g. Waste Line Size. Waste lines and valves should have a minimum inside
diameter of 3 inches. Valves should open to pass 3-inch diameter solids.
All piping and components should be of
corrosion resisting material.