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Tekran - Model 2537Xi-NG -Natural Gas Mercury Monitor
Based upon our highly successful 2537 platform, the 2537Xi-NG on-line natural gas analyzer provides an automated application of ASTM D6340 and ISO 6978 methods. Working with an industry partner, we provide a fully integrated sampling solution including probes, pressure let-down, integrated purge cabinets, and analysis. The Tekran Model 2537Xi-NG Natural Gas Mercury Monitor is designed for automated analysis of Natural Gas and other hydrocarbon gases from pressurized sources. The 2537Xi-NG System is configured specifically to fully comply requirements of ISO Method 6978 and ASTM Method D6340. The system automatically performs a range of quality control checks such as breakthrough and recovery tests to assure system accuracy.
- Liquid mercury embrittlement (LME) will damage aluminum heat exchangers in LNG, hydrocarbon and petrochemical processing plants
- Shutdowns, costly repairs and fires have been documented due to mercury induced heat exchanger failure at processing plants
- Health hazard to workers from residual liquid mercury and vapors may increase cost and complicate plant maintenance
- LNG sales contracts have been cancelled when mercury levels exceed the set threshold
Method ASTMD6350-14
- Manual Method requiring CVAFS
- Requires 2 gold traps in series
- 1 ng/m3detection limit required
- Requires multi-point calibration curve
- Recommends 100-200 ml/min flow & -15 minute sample
- Minimal QA: Periodic breakthrough check, no acceptance criteria
Method ISO-6978-2
- ManualMethod(CVAFSofCVAAS)
- Gold-coated quartz traps acceptable; two in series
- Requires heating of gold traps
- Multipoint Calibration with RSD
- QA- must test gold trap blank level
- QA- Trap efficiency checked with 10 ng spike and measurement
Mercury is the only heavy metal with a high vapor pressure that exists in the vapor phase at room temperature. Mercury vapor has a high affinity for metal, organic residues and other reactive surfaces. Sampling mercury from the complex natural gas sample matrix from a high-pressure pipeline creates a unique set of sampling challenges.
Primary Sampling Issues:
- Filtration: Particles in the NG matrix must be removed priorto sampling
- Surface Losses: Wetted surfaces must be coated with an inert material to prevent losses. Sampling through a system with constant diameter tubing, with no stagnant areas or dead legs, and an electro-polished surface to maintain laminar flow is critical for achieving a representative sample.
- Joule-Thompson Cooling: Large pressure letdown dramatically cools the sample gas, increasing the potential for condensation of Hg, water and other organics in the NG sample stream.
- Only 2 components in entire sample pathway: Filters Critical Orifice
- Conditioning Unit maintains optimal flow path with easy servicing
- Full compliance with ASTM-6350 and ISO-6978
- Analytical cartridge never exposed to sample gas for clean operation
- Multiple automated QA routines validate method performance
- Range 1 ng/m3 to 2000 ug/m3
- Network enabled for remote operation and data retrieval
- Easy servicing of optical components
For more information and a full listing of specifications and uses, please Download the Fact Sheet.
Below is a summary of key features:
- Complies fully with ASTM-6350 and ISO-6978
- Unique dual-bed gold-quartz trap and pure gold analytical cartridge
- Analytical cartridge never exposed to sample gas for clean operation
- Multiple automated QA routines validate method performance
- Range 1 ng/m3 to 2000 ug/m3
- Network enabled for remote operation
- High sensitivity CVAFS Detector
- Complies fully with ASTM-6350 and ISO-6978
- Unique dual-bed gold-quartz trap and pure gold analytical cartridge
- Analytical cartridge never exposed to sample gas for clean operation
- Multiple automated QA routines validate method performance
- Range 1 ng/m to 2000 ug/m3 3
- Network enabled for remote operation
- Touch screen interface
- Local data storage and front panel USB port for data retrieval
- Additional functionality via optional s/w plugins (i.e. valve multiplexer)
- New lamp stabilizer and detector electronics w/ digital PMT control and display
- Easy cuvette removal via convenient fitting interface
- Valve assemblies with low dead-volume and inert PEEK surfaces
- Integrated sample and breakthrough trap assessment with option for single or combined heat provides options for measurement and QA assessment
- Constant power heater control insures consistent temperature over heater life
- Unique design isolates analytical trap from complex natural gas matrix; the trap is only exposed to carrier gas for improve accuracy, precision and robustness
- Integrated permeation source allows assessment of trapping efficiency, matrix effects, and routine automated calibration.
- Instrument case design allows free air exchange throughout instrument to improve overall safety rating
- Improved component accessibility for routine maintenance
- Analyte: Total gaseous mercury in natural gas
- Principle: Dual-bed gold pre-concentration with CVAFS detection.
- Range: 1.0 ng/m3 to 2000 ug/m3
- Sampling Cycle: 2.0 - 60 min
- Sampling: Alternating sample collection and analysis cycles
- Data Outputs: Network (1), USB Device (1), USB Host (2), RS-485 (2), RS-232(1), AnalogChart(2)
- Sample Flow: 0.1 - 0.5 L/min
- Flow Totalization: Precision mass flow controller (MFC)
- Pump: Internal, variable speed (MFC feedback loop control)
- Carrier Gas: Argon or Nitrogen
- Consumption: < 6 L/day (full size tank lasts 2 to 3 months)
- Carrier Setpoint: Precision mass flow controller. Carrier flow is set to one of 3 settings during each desorption cycle. MFC provides superior stability and accuracy.
- Calibration: Automatic multi-point calibration using internal permeation source. Manual injection port also provided
- Physical: Self-contained with maximum internal and external case venting. 19" rack mountable (4U height)