ABB Portable NGC8209 Natural gas chromatograph Description

Description

The truck is moved as close to the sample point as is practical.

A flexible sample line is then uncoiled and attached to the probe

in the flowing natural gas pipeline. If the dew point of the gas or

the weather demands it, this flexible tubing must be heated. A

sample of the gas is extracted from the probe in the line, purged

through the flexible line and then transported to the analyzer.

There it is processed for particle removal and phase integrity,

injected onto the chromatographic columns where component

separation occurs. These components are then quantified by

peak integration and concentration is calculated. The other data

of interest is then calculated from these concentrations.

The Portable NGC8209 analyzes each sample utilizing

established chromatographic techniques. The resulting

information consists of mole percent values for the following:

– Air (Contains N2, Ar, CO and O2 but not CO2), C1, CO2, C2,

C3, IC4, NC4, NeoC5, IC5, NC5, C6’s, C7’s, C8’s, C9+

The NGC8209 measures a C9+ (back flushed) peak. Users may

input the results of a comprehensive lab analysis that reflects

the split or ratio of C9 through C12 components. This ratio can

be used in subsequent analyses and energy calculations.

Calculated values include

– Relative density (specific gravity)

– Btu/CV (heating) value

– GPM (gallons of liquid per thousand cubic feet)

– Wobbe index

Historical data

The NGC8209 is designed to retain historical data. This data

can be used for custody transfer needs, verify transmitter

operation over time, and provide a limited data backup for

communication link reliability. In addition, various CSV file

outputs are available to download the analysis data into

spreadsheet based company specific data sheets, and

outputs to 3rd party gas accounting packages.

The default¹ memory configuration provides the most recent

480 analysis cycles containing:

– Normalized components

– Un-normalized components

– Ideal Btu/CV

– Real Btu (wet and dry) / CV (superior and inferior)

– Relative density (specific gravity)

– Density

– GPM

– Wobbe index

– Alarms

Stream averages for the (default¹) 840 last hours, 35 last

days and the most recent last month analyses. Operational

Parameters for the (default¹) last 480 cycles (Diagnostics Report):

– Selected peak times

– Selected peak areas

– Ideal Btu/CV

– Carrier regulator pressure

– Oven temperature

– Ambient temperature

– Sample pressure

– Detector noise values

– Detector balance values

Audit logs (Default¹)

– Last 480 alarms

– Last 480 events

Data retained by the NGC8209 can be collected via a remote

communication link or by the laptop PC local operator

interface PCCU 32.

Equipment

The equipment used for this analysis consists of the standard

NGC8209 mounted in a black case. It is recommended that

the unit be left in an operational mode while transporting.

All the valves, gauges, inlet ports, and PCCU32 (the laptop

driven man-machine interface) connectors are bulkhead

mounted on panel to provide the technician with ready access.