1. Instrumentation Analyzer Pressure Regulation and Vent Recovery System Frank Ruiz, Ruiz & Associates

2. Analyzer Pressure Regulation & Vent Recovery System Topics n CURRENT TECHNOLOGY n PROBLEMS CONTROLLING SAMPLE FLOW AND PRESSURE n PRESSURE REGULATORS AND FLOW CONTROLLERS n COMBINATION OF PRESSURE AND FLOW CONTROL n TEST RESULTS n SAMPLE SYSTEM WITH FLOW AND PRESSURE REGULATION

3. Analyzer Pressure Regulation & Vent Recovery System Typical Continuous Analyzer System

4. Analyzer Pressure Regulation & Vent Recovery System Typical Continuous Analyzer System n FLOW RATE CONTROLLED WITH A NEEDLE VALVE n FLOW RATE IS A FUNCTION OF  P ACROSS VALVE n  P VARIES WITH INLET PRESSURES CHANGES PRESSURES CHANGES n THEREFORE: FLOW VARIES WITH INLET PRESSURE CHANGES

5. Analyzer Pressure Regulation & Vent Recovery System WHAT HAPPENS TO ANALYZER PRESSURE WHEN FLOW RATE VARIES?

6. Analyzer Pressure Regulation & Vent Recovery System Control Pressure vs. Flow

7. Analyzer Pressure Regulation & Vent Recovery System How Can We Control Flow?

8. Analyzer Pressure Regulation & Vent Recovery System Flow Controllers

9. Analyzer Pressure Regulation & Vent Recovery System Flow Controllers n FLOW CONTROLLERS MAINTAIN A CONSTANT PRESSURE DIFFERENTIAL ACROSS A RESTRICTOR n ABILITY TO REFERENCE UPSTREAM OR DOWNSTREAM PRESSURE n CONTROL VOLUMETRIC FLOW, NOT MASS FLOW. n IMPORTANT TO MAINTAIN A CONSTANT REFERENCE PRESSURE

10. Analyzer Pressure Regulation & Vent Recovery System IF A PRESSURE REGULATOR IS USED TO MAINTAIN A CONSTANT REFERENCE PRESSURE TO THE FLOW CONTROLLER, THE FLOW WILL REMAIN CONSTANT. IF A FLOW CONTROLLER IS USED TO MAINTAIN A CONSTANT FLOW THROUGH THE PRESURE REGULATOR, THE REGULATED PRESSURE WILL REMAIN CONSTANT.

11. Analyzer Pressure Regulation & Vent Recovery System Combining Pressure and Flow Control

12. Analyzer Pressure Regulation & Vent Recovery System Test Setup

13. Analyzer Pressure Regulation & Vent Recovery System Test Objectives n TEST PRESSURE AND FLOW STABILITY BY VARYING SUPPLY PRESSURE FROM 15 TO 90 PSIG WHILE KEEPING THE OUTLET PRESSURE CONSTANT n TEST STABILITY BY VARYING THE OUTLET PRESSURE FROM 0 TO 30” Hg WHILE KEEPING THE SUPPLY PRESSURE CONSTANT n THE FLOW RATE WILL BE 1 LPM FOR ALL TESTS

14. Analyzer Pressure Regulation & Vent Recovery System Pressure Control Test #1 n ANALYZER PRESSURE SET PRESSURE SET @ 5 PSIG n SUPPLY PRESSURE VARIED 20 TO 90 PSIG

15. Analyzer Pressure Regulation & Vent Recovery System Pressure Control Test #2 n ANALYZER PRESSURE SET PRESSURE SET @ 20.5 PSIG n SUPPLY PRESSURE VARIED 30 TO 90 PSIG 90 PSIG

16. Analyzer Pressure Regulation & Vent Recovery System Pressure Control Test #3 n ANALYZER PRESSURE SET PRESSURE SET @ 30 PSIG n SUPPLY PRESSURE SET @ 50 PSIG n OUTLET PRESSURE VARIED 0 TO 30 PSIG

17. Analyzer Pressure Regulation & Vent Recovery System Pressure Control Test #4 n ANALYZER PRESSURE SET PRESSURE SET @ 12.7 PSIA n SUPPLY PRESSURE SET @ ATMOSPHERIC n OUTLET PRESSURE VARIED 1 TO 11 PSIA

18. Analyzer Pressure Regulation & Vent Recovery System CONCLUSION The flow and pressure were held very steady with the combination of Flow and Pressure Regulators

19. Analyzer Pressure Regulation & Vent Recovery System n EVEN BETTER REGULATION IS ACHIEVED BY OPTIMIZING THE REGULATOR CONTROL RANGE AND Cv

20. Analyzer Pressure Regulation & Vent Recovery System Example System

21. Analyzer Pressure Regulation & Vent Recovery System Continuous Analyzer Sample System

22. Analyzer Pressure Regulation & Vent Recovery System

23. Thank you! Questions?