04779186 is referenced by 53 patents and cites 51 patents.

A control system is provided which can be retrofit to existing conventional blender devices, such as a blender trailer used for combining a pregelled liquid with a solid particulate additive at a well site. The control is provided either manually or automatically from a remote location where a display unit and a computer unit of the invention are located, such as in a frac van. The display unit and the computer unit are connected together by a multi-conductor cable, and the display unit is connected by a multi-conductor cable to a terminal unit mounted on the blender. Control signals are output from the display unit, under automatic control by the computer unit or under manual control by potentiometers attached to the display unit, to control electrohydraulic valves associated with screw conveyors mounted on the blender. Linear variable differential transformer signals from the electrohydraulic valves, rotational speed signals from the screw conveyors, and flow rate signals from the inlet pregelled liquid are communicated to the display unit for use by it and the computer unit in generating the valve control signals.

Title
Automatic density control system for blending operation
Application Number
6/946711
Publication Number
4779186
Application Date
December 24, 1986
Publication Date
October 18, 1988
Inventor
Scott A Berning
Duncan
OK, US
Wayne A Handke
Duncan
OK, US
Agent
E Harrison Gilbert III
James R Duzan
Assignee
Halliburton Company
OK, US
IPC
G05D 11/13
G06F 15/46
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