What if a rupture or other leakage occurs, or just down-time of the molding machine?
The patent application discusses this fully. As in any metal process, a safety pit or floor dikes must contain any possibility. The VPV or furnace is under constant, steady, pressure when operating, so that every mold is filled exactly the same (at the same speed, pressure, and temperature, eliminating variation). If rupture occurs, a valve immediately releases the pressure and another valve connected to a reserve vacuum tank immediately withdraws the metal from the mold line. Furthermore, poor quality molds cannot push the mold line through the machine. If the molds can enter the machine it is very unlikely they will rupture. The filter cloth will not fail, but if it did, it would be a very slow leak and would freeze off.
