Riken Keiki OHC-800, Руководство по эксплуатации

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3 How to Install Calorimeter 3-4. How to tube
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The table below shows the guideline values for the "setting pressures of external pressure regulator" and
"bypass flow rates" corresponding to the "tubing diameters" and "tubing lengths" from the external pressure
regulator to GAS IN of the sampling device in the tubing system shown on the previous page.
Use this table only for your reference because it shows estimated values for assumed arrival time of six
seconds or shorter, without any view for upstream tubing structure from external pressure regulator or filters
installed at any point of the tubing.
Tubing length
Tubing diameter
10 m 20 m
Φ 3, 1/8"
Setting pressure: 0.04 MPa
Bypass: Not required
Setting pressure: 0.2 - 3 MPa
Bypass flow rate: 2 - 5 L/min
Φ 6, 1/4"
Setting pressure: 0.1 MPa
Bypass flow rate: 2.5 - 5 L/min
Setting pressure: 0.1 MPa
Bypass flow rate: 5 L/min
Φ 8, 5/16"
Setting pressure: 0.1 MPa
Bypass flow rate: 5 - 10 L/min
Setting pressure: 0.1 MPa
Bypass flow rate: 10 L/min
Φ 10, 3/8"
Setting pressure: 0.1 MPa
Bypass flow rate: 10 - 20 L/min
Setting pressure: 0.1 MPa
Bypass flow rate: 20 L/min
Use tubing with a large inner diameter for GAS OUT and RELIEF OUT.
Φ 6-4 Φ 8-6 Φ 10-8
GAS OUT 5 m or shorter 25 m or shorter -----
RELIEF OUT 0.5 m or shorter 4 m or shorter 10 m or shorter
3-4-3. Precautions on tubing work

Use stainless tubing.

After the tube is cut, its cut point may have a smaller inner diameter.
Use a file etc. to expand the inner diameter of the cut point.

Cut-dust of tubing may cause failures of the needle valve, flow rate detection mechanism, switching
valve etc. To remove cut-dust remaining inside of the tube, blow compressed air etc., into the tube before
connecting it to the calorimeter.

Determine a sampling point inlet for the measuring gas, considering the airflow of the measuring gas line,
unevenness in the manufacturing process of the fuel gas.

Adjust the measuring gas equivalent to the ambient temperature before supplying it to the sampling
device.