68
Reference Manual
00809-0100-4809, Rev DA
Section 3: Commissioning
September 2015
Commissioning
Steam service 5-valve manifold
The following procedures assume the process pipe is pressurized to normal operating pressure
and should be followed to obtain a true zero at static or “pipe” pressure.
After flow has been started and allowed to reach operating conditions a zero trim procedure
needs to be performed.
1. Using the drain/vent valves DVH and DVL; burp (carefully crack vents open and closed
to ensure that no air is present, this may need to be done more than one time.) Refer to
Figure 3-2 for valve designations.
Note
Step 1 would cause a loss of some water column in both the high and low sides, due to draining
of the water legs. If Step 2 is performed, the Annubar sensor assembly should be given sufficient
time to re-stabilize before continuing to Step 3.
2. Close the low side valve ML.
3. Open manifold vent MV; Bleed until no liquid is present in the gas.
4. Close manifold vent MV.
5. Close low side manifold valve ML.
6. Check transmitter zero by noting the output. If the signal reads outside of the range
3.98 mA to 4.02 mA then, perform a zero trim procedure as described in the
transmitter manual.
3.3.2 Remote mount transmitter
Prepare transmitter for service
Prior to commissioning the flowmeter, a zero trim procedure (or “dry” zero) should be
performed to eliminate any positional effects to the transmitter. Refer to Figure 3-1 and Figure
3-2 for valve designations.
1. Open first the equalizer valve(s) MEL and MEH or ME.
2. Close valves MH and ML.
3. Read the transmitter output. It should read within the range 3.98 mA to 4.02 mA. If the
output is outside of this range, perform a zero trim procedure as described in
transmitter manual (see Table 3-1 for transmitter manual document numbers).
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