# US 2014/0190573 A1 · System and Method for Generating a Change in Pressure Proportional to Fluid Viscocity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190573 A1 - Document ID: US20140190573A1 - Status: Published application - Kind: A1 - Application number: 13/735,258 - Filed: 2013-01-07 - Published: 2014-07-10 - Earliest claimed: 2013-01-07 - Assignees: Flowpro Well Technology a.s. - Inventors: Kristian Brekke - Web page: https://patentgrep.com/patent/US20140190573A1 ## CPC - G05D 16/14: with auxiliary non-electric power - F17D 1/14: Conveying liquids or viscous products by pumping - G01N 11/00: Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties - G01N 11/02: by measuring flow of the material - G01N 11/04: through a restricted passage, e.g. tube, aperture - G01N 11/08: by measuring pressure required to produce a known flow - Y10T 137/0396: Involving pressure control - Y10T 137/87362: Including cleaning, treating, or heat transfer feature - G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES - F17D: PIPE-LINE SYSTEMS; PIPE-LINES (pumps or compressors F04; fluid dynamics F15D; valves or the like F16K; pipes, laying pipes, supports, joints, branches, repairing, work on the entire line, accessories F16L; steam traps or the like F16T; fluid-pressure electric cables H01B9/06) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract This disclosure relates to a system and method for generating a change in pressure proportional to fluid viscosity. In particular, the disclosure discusses a viscosity dependent pressure differential system. The system can comprise a first pilot stream, a second pilot stream, and a pressure sensing device that reads a differential pressure across a first junction on the first pilot stream and a second junction on the second pilot stream. The first junction is between a first section having a first predominant pressure loss characteristic, and a second section having a second predominant pressure loss characteristic. Similarly, the second junction can be between a third section having a third predominant pressure loss characteristic and a fourth section having a fourth pressure loss characteristic. ## Claims ### Claim 1 A viscosity dependent pressure differential system comprising a first pilot stream connectable to a main stream, said first pilot stream comprising a first inlet connected to said mainstream; a first section comprising a first predominate pressure loss characteristic, connected to said first inlet; a first junction connected to said first section; a second section comprising a first predominate pressure loss characteristic, connected to said first junction; and a first outlet that connects said second section and to said mainstream; a second pilot stream connectable to a main stream, said second pilot stream comprising a second inlet connected to said mainstream; a third section comprising a third predominate pressure loss characteristic, connected to said tinlet; a second junction connected to said third section; a fourth section comprising a fourth predominate pressure loss characteristic, connected to said third junction; and a second outlet that connects said second section and to said mainstream; and a pressure sensing device connecting that reads a differential pressure across said first junction and said second junction. ### Claim 2 (depends on 1) The system of claim 1 wherein said second inlet is said first inlet. ### Claim 3 (depends on 1) The system of claim 1 wherein said first predominant pressure loss characteristic and said fourth predominant pressure loss characteristic are frictional losses. ### Claim 4 (depends on 1) The system of claim 1 wherein said first predominant pressure loss characteristic and said fourth predominant pressure loss characteristic are inertial losses. ### Claim 5 (depends on 1) The system of claim 1 further comprising a third pilot stream connectable to a main stream, said third pilot stream comprising a third inlet connected to said mainstream; a fifth section comprising a fifth predominate pressure loss characteristic, connected to said third inlet; a third junction connected to said fifth section; a sixth section comprising a sixth predominate pressure loss characteristic, connected to said third junction; and a third outlet that connects said second section and to said mainstream. ### Claim 6 A method of determining viscosity using differential pressure, comprising measuring a differential pressure between a first junction and a second junction, said first junction between a first pilot stream first section having a first predominant pressure loss characteristic, and a second section having a second predominant pressure loss characteristic, said second junction between a second pilot stream first section having a third predominant pressure loss characteristic and a second pilot stream second section having a fourth predominant pressure loss characteristic. ### Claim 7 (depends on 6) The method of claim 6 wherein said first predominant pressure loss characteristic and said fourth predominant pressure loss characteristic are frictional losses. ### Claim 8 (depends on 6) The method of claim 6 wherein said first predominant pressure loss characteristic and said fourth predominant pressure loss characteristic are inertial losses. ### Claim 9 (depends on 8) The method of claim 8 wherein said second predominant pressure loss characteristic and said third predominant pressure loss characteristic are frictional losses. ### Claim 10 (depends on 6) The method of claim 6 comprising the additional step of controlling a process depending on the value of said differential pressure. ### Claim 11 (depends on 10) The method of claim 10 wherein controlling said process comprises actuating a valve.