A closed-purge sampling system eliminates emissions due to purging either by returning the purge material directly to the process or by collecting the purge in a system that is not open to the atmosphere for recycling or disposal.
A closed-loop sampling system also eliminates emissions due to purging by returning process fluid to the process
through an enclosed system that is not directly vented to the atmosphere. A closed-vent system captures and transports the purged process fluid to a control device.
Figure 5.24.8 shows two such systems.
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