Lid assembly for a vacuum receiver vessel

A lid for use on an open top, circular cross-sectioned, vacuum receiver vessel for collecting a particulate having a mass, the vacuum receiver vessel having a first inside diameter, comprising:

• a centrally oriented first through-opening in said lid;
• a gas/air and gas/air entrained particulate intake pipe connected to communicate with said first through-opening, said intake pipe including a particulate kinetic energy reduction surface oriented immediately above said centrally oriented first through-opening, a centrally disposed non-perforated cylindrical pipe connected to and extending away from said lid on a side of said lid that is remote from said intake pipe and said particulate kinetic energy reduction surface and into the open top of the receiver vessel a finite distance that is a minimum of 2.5 times an outer diameter of said non-perforated pipe, said outer diameter of said cylindrical pipe being selected so that the relationship of said outer diameter of said cylindrical pipe and an inside diameter of the vacuum receiver vessel onto which said lid is being fastened has a ratio that is equal to or greater than 1:2.5;
• a plurality of second through-openings in said lid that are oriented circumferentially generally equidistantly spaced around said first through-opening and generally equidistantly spaced from a center of said first through-opening and specifically configured to cause a uniform volume of gas/air to flow inside the receiver vessel through a gas/air space between said outer diameter of said cylindrical pipe and an inside diameter of the vacuum receiver vessel and toward said second through-openings, a velocity of the volume of gas/air being insufficient to keep the particulate entrained in the gas/air flow;
• and
• a gas/air outlet pipe connected to communicate with each of said second through-openings, said outlet pipes being connected together at a manifold to form a single air outlet pipe configured to be connected to a vacuum source;
• whereby when the vacuum source is activated, gas/air and gas/air entrained particulate will, after the velocity of the gas/air entrained particulate has been decelerated by the particulate deceleration surface, be drawn into the vacuum receiver vessel through said non-perforated cylindrical pipe and as the gas/air and gas/air entrained particulate exit said non-perforated cylindrical pipe, the gas/air will be uniformly drawn into the aforesaid air space between said outside diameter of said non-perforated cylindrical pipe and said inside diameter of said vacuum receiver vessel to exit the vacuum receiver vessel through said second through-openings in said lid whereas the kinetic energy component of the particulate will cause the particulate to become dissociated from the gas/air flow and since the gas/air flow in the aforesaid air space is at a velocity that is below a pick-up velocity of the particulate, the particulate will be caused to be deposited, due to an influence of gravity on the particulate, into the vacuum receiver vessel.