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Automatic density control system for blending operation

  • US 4,779,186 A
  • Filed: 12/24/1986
  • Issued: 10/18/1988
  • Est. Priority Date: 12/24/1986
  • Status: Expired due to Term
First Claim
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1. Retrofit apparatus for controlling the blending of a solid substance with a liquid substance, said apparatus comprising:

  • a multiple-conductor electrical cable;

    local terminal means, mountable on a conventional blender previously manufactured for use at a well site, for connecting respective ones of the conductors at one end of said cable to respective components mounted on said blender; and

    control means, mountable at a location within the vicinity of the well site but spaced from said blender and connectable to said respective ones of the conductors at the other end of said cable, for providing one of manual control signals and automatically calculated control signals through conductors of said cable in response to signals received by said control means through other conductors of said cable from said components of said blender connected by said terminal means to said cable, said control signals controlling the amount of the solid substance added to the liquid substance.

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