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1 Gas Lift Slide 2 2 Several Installations Slide 3 StarPac Flow Calculation & StarTalk Slide 4 4 Where does the Valtek Flow Equation come from? ANSI/ISA -S75.01-1985 defines the flow equations as they relate to control valves. Valtek Sizing and Selection Manual Section 3 contains the information in a simplified form. Valve Flow equations are quite good with accurate characterization data. Slide 5 5 The Basic flow equation Based on Bernoullis equation. Fundamentally differential pressure measurement Slide 6 6 Similarities with Orifice plate Differential pressure measurement. Capacity factor part of equation. Restriction of flow required. Slide 7 7 Differences from Orifice plate Valve is a designed restriction in the process, orifice plate is not. Valve differential pressure increases at low flow rates. StarPac works in a wide range of flow conditions: Flashing, cavitating, etc. Slide 8 8 Differences from Orifice plate (Cont.) Orifice requires a repeatable meter run, StarPac generates its own. StarPac has 30:1 rangeability. Slide 9 9 Flow vs. DP for an Orifice Slide 10 10 Flow vs. DP for StarPac Slide 11 11 ISA Flow Equation as Programmed into StarPac A B C D E Slide 12 12 Measure Inputs, Determine Phase (A) Slide 13 13 Gas Properties (B) Slide 14 14 Gas Flow (C) Slide 15 15 Liquid Properties (D) Slide 16 16 Liquid Flow (E) Slide 17 How it works... T P2 P1 Valve Cv, Fl & Xt Data stored as function of stroke Digital Positioner Slide 18 18 Short Lag System Higher Integral (pepeats/minute) can be applied Faster response system (Dp device), Flow controller and final control element are the same. Slide 19 19 Accuracy Repeatability and response time are key closed loop control issues. StarPac Calibration is generalized for very wide range of operating conditions. Slide 20 20 StarTalk Slide 21 21 StarTalk Slide 22 22 StarTalk Real Time logging of P1, P2, T, Flow Valve Position and Flow Total Simple configuration & calibration of sensors Security & Event Logger Tech Analyst & Tech Rx Slide 23 23 Thank You