Vacuum Tank Design Requirements

Gas/air porosity constitute a large part of the total porosity.  To reduce the porosity due to the gas/air entrainment, vacuum can be applied to remove the residual air in the die.  In some cases the application of vacuum results in high quality casting while in other cases the results are not satisfactory.  One of the keys to the success is the design of the vacuum system, especially the vacuum tank.  The present study deals with what are the design requirements of the vacuum system.  Design criteria are presented to achieve effective system.