Table of Contents

Foreword<br>Standards Committee Roster<br>Introduction<br>1. Scope<br>2. Field of Application<br>3. References<br>4. Pressure Taps<br>4.1 Location of Pressure Taps in Horizontal Pipes<br>4.2 Location of Pressure Taps in Vertical Pipes<br>4.3 Pressure Taps and Connections<br>4.4 Practical Requirements<br>5. Block Valves<br>5.1 General<br>5.2 Valve Passages<br>6. Condensation Chambers<br>7. Gas Collecting Chambers and Settling Chambers<br>7.1 Gas Collecting Chambers<br>7.2 Settling Chambers<br>8. Special Techniques Used as Protection Against Very<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Cold Ambient Conditions<br>9. Seal Pots and Purge Systems<br>9.1 Seal Pots<br>9.2 Purge Systems<br>9.3 Rodding Units<br>10. Lead Lines<br>11. Installation<br>11.1 Arrangement of Valves<br>11.2 Arrangement of Lead Lines<br>Figures<br>1. Typical Arrangements for Pressure Taps<br>2. Condensation Chamber Characteristics, Types A,B and <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C<br>3. Range of Application of Condensation Chambers<br>4. Arrangement of Wall Mounted Gas Collecting Chambers<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;and Valves<br>5. Settling Chamber<br>6. Seal Pots - Metered Fluid Heavier Than Sealing <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fluid<br>7. Seal Pots - Metered Fluid Lighter Than Sealing <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fluid<br>8. Example of Purge System Installation<br>9. Example of Purge System Installation in the Case of<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Long Lead Lines<br>10. Horizontal Installation for Clean Liquids - <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Secondary Device Below Pipe Line<br>11. Horizontal Installation for Cold Clean Liquids - <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Secondary Device Above Pipe Line<br>12. Vertical Installation for Hot Clean Liquids<br>13. Horizontal Installation for Clean Noncondensable <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gases - Secondary Device Above Pipe Line<br>14. Horizontal Installation for Clean Noncondensable<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gases - Secondary Device Below Pipe Line<br>15. Vertical Installation for Clean Noncondensable <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gases - Secondary Device Above Pressure Taps<br>16. Vertical Installation for Clean Noncondensable <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gases - Secondary Device Below Pressure Taps<br>17. Horizontal Installation for Vapor (Steam), <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Condensable Gases, or Dirty Gases - Secondary<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Device Below Pipe Line<br>18. Alternative (Closed-Coupled) Horizontal <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Installation for Vapor (Steam) - Secondary Device <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Below Pipe Line<br>19. Horizontal Installation for Vapor (Steam), <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Condensable Gases, or Dirty Gases - Secondary <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Device Above Pipe Line<br>20. Vertical Installation for Vapor (Steam), <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Condensable Gases, or Dirty Gases - Secondary<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Device Below Pressure Taps<br>21. Horizontal Installation for Clean Wet Gases - <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Secondary Device Below Pipe Line<br>22. Alternative Horizontal Installation for Clean Wet<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gases - Secondary Device Below Pipe Line<br>23. Horizontal Installation for Clean Wet Gases - <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Secondary Device Above Pipe Line<br>24. Vertical Installation for Clean Wet Gases - <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Secondary Device Below Pressure Taps<br>25. Vertical Installation for Clean Wet Gases - <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Secondary Device Above Pressure Taps<br>26. High-Pressure/Temperature Steam Installation for<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Vertical Pipe<br>27. High-Pressure/Temperature Steam Installation for<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Horizontal Pipe<br>Tables<br>1. Condensation Chambers<br>2. Properties of Sealing Liquids<br>3. Internal Diameter of Lead Lines<br>4. Applications<br>Appendices<br>A. Formulas for Differential Pressure Calculation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;When Seal Pots Are Used<br>B. Description of Typical Rodding Units<br>Figures<br>A1. Differential Secondary Device With a U-Tube Used<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;With Seal Pots<br>A2. Differential Secondary Device With an Equalizing<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Vessel on One Branch, Used With Seal Pots<br>B1. Rodding Unit<br>B2. Arrangement of Rodding Unit and Settling Chamber

Abstract

Explains the practices and means which allow the pressure at a head type primary device to be conveyed to the secondary device in a flow measurement system without introducing unnecessary measurement uncertainties. Concerned only with the transmission of the pressure difference developed by a head type primary flow element.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	American Society of Mechanical Engineers
ProductNote	Reconfirmed 2011
Pages
ISBN