Emerson 3051S Specifikace stáhnout pdf (Strana 54)

Reference Manual

00809-0100-4803, Rev DA

Section 3: Configuration

April 2013

Configuration

5. If appropriate, enter the optional data for the Natural Gas Characterization Method that

was selected in Step 2. Optional data for each method is listed in Ta ble 3 -3 .

6. Enter the Nominal Operating Pressure, then the Nominal Operating Temperature as the

entry blanks come available. Engineering Assistant will automatically fill in suggested

operating ranges. Note that these values may be edited by the user.

7. Click Next. This will open the Fluid Properties tab.

8. Proceed with the steps in “Fluid properties” on page 20.

Custom gas

The Custom Gas option should be used for fluids not in the database such as proprietary fluids or

gas mixtures. To properly calculate the fluid properties, the compressibility factor or density

needs to be entered at specific pressure and temperature values based on the operating ranges

entered by the user. The pressure and temperature values may be edited as needed. The

editable values are shown in fields with white backgrounds. For best performance, it is

recommended that, whenever possible, the compressibility or density values be entered at the

suggested pressure and temperature values.

To ease entering the compressibility/density or viscosity values, data can be copied from a

spreadsheet and pasted into the grid. The recommended process is to copy the pressure and

temperature values from the table on the Engineering Assistant screen to assist in computing

the density or compressibility values. Once the compressibility or density values are computed,

they may then be copied from the spreadsheet and pasted into the grid on the Custom Gas Fluid

Properties tab.

1. Expand the Gas category.

2. Select the Custom Gas option.

3. Enter the Nominal and Operating Pressure and Temperature Ranges. Engineering

Assistant will use these ranges to identify the pressure and temperature values at which

the fluid properties are required.

4. Click Next to proceed to the Custom Gas Fluid Properties tab.

5. Enter the Molecular Weight of the Custom Gas. When the molecular weight of the gas is

entered, the other data entry fields on the tab are enabled as shown in Figure 3-14.

6. Select either Density or Compressibility and enter data. Note that all pressure and

temperature values may be edited except the minimum and maximum values. The

minimum and maximum values were set on the Fluid Selection tab.

7. Enter the Density or Compressibility at reference conditions.

8. Enter the Custom Gas Viscosity at the given temperatures. Note that all temperature

values may be edited except the minimum and maximum temperatures.

9. Enter the Custom Gas Isentropic Exponent.

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Emerson 3051S Specifikace Strana 54