Dresser Model 10C25 Series K Installation, Operation, and Maintenance Manual
© 2018 Natural Gas Solutions North America, LLC
Page 15 of 74
b.
If needed, change the orientation of the digital index for the configuration (vertical or
horizontal) in which the meter will be installed. For more information, refer to Section 12.4.
c.
Verify the impellers turn freely and no objects or contaminants are in the measuring chamber.
To check the meter, blow dry air lightly into the meter inlet to verify the free rotation of the
impellers.
Depending on the meter’s condition, the meter might ne
ed to be flushed with an approved
solvent. Verify the measuring chamber is clean and dry and the impellers turn freely before
installing.
For information about cleaning the meter, refer to Section 12.3.
2.
Connect the meter inlet to the gas supply side of the
line. Verify the gas will flow in the same direction as
the arrow on the meter body nameplate (for example,
the arrow is pointing
downward
for the top inlet or in
both directions for bi-directional flow).
Figure 10: Gas flow direction
3.
Install the meter without piping strain to prevent binding.
4.
Check the orientation of the meter with a level. The meter must be level within 1/16 inch per foot
(5mm/m) in any direction, side to side, front to back.
7
Meter Startup
After proper installation and leveling of the meter, as described in Section 6, perform the following steps
to start up the meter:
1.
Slowly open the meter inlet valve just enough to allow gas into the meter.
This gas flow allows the meter to pressurize. The Flow Indicator may start to rotate during this
process.
CAUTION
Do not exceed five (5) psig/second (35 kPa/second) maximum when pressurizing the meter.
Rapid pressurization can cause an over-speed condition, which may damage the meter.
Resulting damage is not covered by warranty.
2.
Open the bypass and outlet (downstream of meter) gas valves.
3.
Partially open the meter inlet gas valve until the meter starts operating at low speed. Throttling of the
bypass valve might be necessary to initiate gas flow through the meter.
4.
Verify gas is flowing though the meter by watching for movement of the Flow Indicator to indicate
impeller rotation, and then proceed depending on the results:
•
If movement is present, go to Step 5.
•
If the Flow Indicator is not turning, verify gas is being delivered to the meter.
•
If gas is flowing to the meter inlet and the Flow Indicator is not moving, go to Step 6.
