4-9
Gas Service Follow this procedure for commissioning a remote mounted ProPlate for
gas service. Refer to Figure 2-29 and Figure 2-30 on page 2-22 for
electronics location and valve identification.
1. For an impulse piping arrangement as shown in Figure 2-29 on
page 2-21 (vertical pipe) only, open primary instrument valves PH
and PL.
2. Open drain valves DH and DL slowly to allow the condensate
to drain.
3. Close valves DH and DL.
4. Ensure that primary instrument valves PH and PL closed.
5. Open valves ME, ML and MH.
• For 5-valve manifolds, open valves MEH and MEL.
6. Slowly open valve PL, the primary high pressure instrument
valve.
7. Check electronics zero by noting the electronics reading. The
electronics should indicate a “zero” DP signal. If the signal reads
outside of the range 3.98 mA to 4.02 mA, condensate may be in the
DP electronics or system; repeat the procedure from step 1 to
remove any condensate. A signal outside the range 3.98 mA to 4.02
mA can also be caused by system leaks; check for leaks in system.
8. Close equalizer valve(s).
• For 3-valve manifolds, close valve ME.
• For 5-valve manifolds, close valves MEH and MEL.
9. Slowly open valve PH. The system is now operational.
For 5-valve manifolds only:
10. Open valve MV. If valve MV is leaking, valves MEH and/or MEL
are not fully closed or require repair. This must be done before
taking any readings.
To Next Page
Loading...
Need help?
General
