This section applies to liquids having a pour point significantly below the lowest ambient temperature encountered at the field location of the process line and the flow meter.
The objective of this orientation is to ensure that all non-condensable gases entrained or dissolved in the process liquid will vent back into the process line.
• Locate the flow meter below the line. For vertical lines, locate the flow meter below the orifice plate.
• For horizontal meter runs, use the flange taps located below the center line of the pipe.
• Mount the flow meter and install the three- (or five) valve manifold so that the flow meter and manifold are self-venting.
• Route the tubing leads between the flow meter and the root valves so that they slope continuously upward toward the root valves and are, therefore, selfventing.
Ensure that there are no pockets where gases can get trapped.