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Figure 5.11: Flow diagram Sample Conditioning and Selection System
5.4.1 Double Block and Bleed Function
After small particles are filtered out by the inlet filters in the inlet couplings, the pressure
is reduced to approximately 0.8 barg. From the pressure regulators the gas will flow to
the manifold. There are several valves mounted on the manifold.
The two most right valves are purge valves. The upper purge valve is the sample bypass
valve (Activated by timed relay 2). The lower is a helium purge valve and activated by
timed relay 3.
The stream and calibration valves form pairs that are actuated at the same time.
The valves left from the purge valves are used for the calibration. Next to the calibration
valves there are 1 up to 5 pairs used for the streams. Depending on the configuration
the manifold can support up to 3 or up to 6 streams (including the calibration gas
stream). Unused positions on the manifold are blocked.
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