Meriam 70H_72H High Pressure Wet Tap Accutubes with Integral 3-Valve Head and Optional RTD - Manual (Page 26)

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5 OPERATION
5.1 Once the Accutube is installed in the proper location and the instrument lines are
installed to the indicator, the unit is prepared for operation. Operation of the Accutube
involves setting valves in the proper sequence. Refer to Figure 5.1 in the following
steps.
5.2
Verify that the operating pressure and temperature are within the Accutube and valve
limitations (see Table 5).
5.3
Close Accutube valves A and B and start up the system.
5.4
Open valves C, D, and E on the three valve manifold (the indicator should read zero).
5.5
Open valves A and B.
5.6
Close valve E.
5.7
For liquid applications, open and bleed off air at any points where vent valves have been
included.
5.8
The Accutube is now in operation. In most cases the system can be shut down and
turned on again without performing the startup sequence. For liquid applications, air
venting should be done on a regular basis and also upon system restarts. On steam
installations a stabilization period of 1/2 hour may sometimes be required
FIGURE 5.1 TYPICAL VALVE ARRANGEMENT