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Tip
To avoid excessive pressure drops in your sample pipeline, be sure to monitor the condition of the
filters. Do this by varying the sample flow rate and monitoring the magnitude of the resultant density
changes. Pressure drops through the filters can cause density errors if they become too large.
1.6.2
Meter installation in a vented gas application
The vented gas method allows the gas to be vented to flare or, in some cases, to
atmosphere. With this method, the full-pipe pressure is available as a pressure drop. For
high-pressure applications, a two-stage letdown system may be required to prevent icing.
CAUTION!
Because the full-pipe pressure is available as a pressure drop, ensure that the flow is
adequately controlled by the control valve.
Installation Manual
Planning
11
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