ABB NGC8206 Natural Gas Chromatograph Dual Unit

ABB NGC8206  Natural Gas Chromatograph Dual Unit 

The ABB Natural Gas Chromatograph (NGC) and Process Gas Chromatograph (PGC) continually analyze natural gas or process gas streams on-site, determine composition and calorific value, and store the analysis information.

System components This compact device requires minimal installation time and is configured and calibrated at the factory. A typical installation has the following components:  Analyzer: a single analyzer supports a single or multiple streams (up to 4)  Sample probe: captures the gas sample from the pipeline  Sample conditioning module(s): prepares the sample before it enters the analyzer  Carrier gas: assists the flow of the gas sample  Calibration gas: gas blend with detectable components to determine baseline analysis  Tubing: gas lines to deliver and vent gas to and from the analyzer. Figure 1-1 shows the analyzer in a typical single stream pipeline installation. This scenario includes a sample probe, an optional sample conditioning module, and carrier and calibration gas. Lines for the entry of the gas sample, carrier gas, and calibration gas are installed into the analyzer’s feedthrough inlets. The sample probe captures the gas sample which is fed to the sample conditioning module for processing before it enters the analyzer. Carrier gas assists the gas sample flow through the device. Figure 1-1: Typical single stream installation

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.

The NGC8206 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. The user is allowed to configure the period of the data retained by the NGC8206 via the Operator Interface. 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

The NGC8206 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. The user is allowed to configure the period of the data retained by the NGC8206 via the Operator Interface. 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)