ABB NGC8206 Natural gas chromatograph Description

Description

The NGC8206 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+

Using process chromatographic techniques, the columns are

back flushed so that the NGC8206 measures a C6+ peak. Users

may input the results of a comprehensive lab analysis that

reflects the split or ratio of C6 through C10 components. This

ratio can be used in subsequent analysis and energy

calculations. Calculated values include:

• Gas compressibility per AGA 8

• Real Relative Density (Specific Gravity)

• Btu/CV Value

• GPM (gallons of liquid per thousand cubic feet)

• Wobbe Index

• Methane Number

• Optional calculations can include: AGA 10 speed of sound,

Hydrocarbon Dew Point

Installation

The NGC8206 is a weatherproof device designed for

installation “on the pipe” near to the sampling point. This

means it is acceptable to mount outside - in a temperature

range of 0°F to 130°F (–18°C to 55°C) [provides reliable

operation for –20°F to 130°F (–29°C to 55°C) with low

temperature option] onto a pipeline with 2" to 12" pipe sizes or

with an optional pole mount configuration. A cold weather

enclosure is also available if ambient conditions are below

either the sampled gas dew point or the operational

specifications of the unit.

Sample conditioning system

The integral stream selector for the NGC8206 allows sampling

up to four (4) different natural gas streams. Up to two of these

sample streams can be designated as the “calibration/

validation sample”. Optional sample conditioning modules are

available to address natural gas streams that need additional

filtering and “speed loops” to reduce sample transport lag times.

Operator interface

Functional setup and operation of the NGC8206

is accomplished by using a graphical user’s interface software

package called PCCU 32 (supplied with each unit) operating on

a laptop PC in a Microsoft® Windows® environment. The

“Windows®” utilities, combined with software designed

specifically for the NGC8206, provide a powerful tool for

operations, diagnostics, and downstream data handling.

The PC can be directly connected to the NGC8206 via an

RS-232, USB, or Ethernet connection, or indirectly by remote

telemetry (phone modem, radio, cell phone, satellite, etc.).

The user is prompted through push-buttons, drop-down

boxes, wizards, and dialog boxes for setup, operations, data

collection and monitoring.

In addition, the unit has an optional ¼ VGA interactive display

screen allowing the user access to basic analysis data. The

user can also accomplish most of the “operator” functions

from the front panel display with out the use of a laptop PC.

The “Run-Hold-Calibrate” functions can be done via a magnet

interface through the explosion proof glass in the display