HYDROCARBON DEW POINT

HYDROCARBON DEW POINT

For natural gas producers and pipeline operators and direct contract buyers, hydrocarbon dew point is difficult to measure and control – but it is vital to avoid custody transfer disputes frequently resulting in shut-ins due to today’s tighter contractual limits.

Accurate hydrocarbon dew point measurement and control has emerged as THE issue at gas quality conferences, including the AGA. The need for harmonization of analysis methods to ensure consistent best practice is being promoted by research groups within independent organizations such as API in North America and GTE and GERG in Europe.

CONDUMAX II

Automatic, on-line measurement of hydrocarbon and water dew point in natural gas.

Product Features:

Fully automatic on-line analysis
Objective, highly repeatable
0.5°C hydrocarbon dew-point accuracy
Fundamental cooled mirror principle
Patented detection technique
Self-cleaning
No purge or cooling gas needed
Optional water dew point analysis
Modbus RTU

Technical Specifications

Hazardous Area Certification	II 2 G EExd IIB + H2 T4 Tamb =60°C Certificate number TRL04ATEX11060X CSA (US) certified to Class 1, Div 1, Groups B, C & D, T4. Certificate number 1722693.
Hydrocarbon Dew-Point Measurement
Measuring technique	DARK SPOT™ fixed sample analysis. Direct photo-detection of hydrocarbon condensate at hydrocarbon dew-point temperature.
Sensor cooling	Automatic via 3-stage Peltier effect electronic cooler under adoptive control
Maximum range	Up to Δ 55°C measurement depression from Main Unit operating temperature
Accuracy	±0.5°C hydrocarbon dew point (single and multiple condensible component analysis)
Sample flow	0.03 m3/hr (0.5 l/min) – alarm standard
Measurement frequency	6 cycles/hour (recommended) 12 cycles/hour (maximum)
Water Dew-Point Measurement (optional)
Measuring Technique	Michell Ceramic Moisture Sensor
Range	Calibrated from -100 to +20°C dew point
Accuracy	±1°C from -59 to +20°C dew point ±2°C from -100 to -60°C dew point
Sample flow	0.06 to 0.3 m3/hr (1 to 5 ln/min) – alarm standard
Pressure Measurement
Units	MPa, Barg, psig
Range	HCdp: 0 to 100 Barg Wdp: 0 to 200 barg
Accuracy	±0.25 % FS
Hydrocarbon Dew-Point Analyser
Resolution	Hydrocarbon and water dew point: 0.1°C Pressure: 0.1 MPa and Barg, 1 psig
Sample gas supply	Natural gas up to 100 Barg, pressure regulated in sampling system.
Enclosure	EExd cast enclosure with removable glass window viewing port. Internally heated for condensation protection.
Sample gas connections	1/4″ NPT female ports for both hydrocarbon and water dew-point channels. Sampling system: 6 mm OD Std / ¼” OD optional
Operating environment	Indoors/Outdoors -20 to 50°C. Max 95 % rh.
Power supply	90 – 264 Vac 50/60 Hz, 200 W Main Unit; 300W c/w indoor sampling system; 400W c/w outdoor sampling system
Weight	Main Unit 22.5 Kg 42 kg (approx) c/w Sampling System (indoor) 57 kg (approx) c/w Sampling system (outdoor)
Integrated display/keyboard	Touch screen with vacuum fl uorescent display
Outputs	Modbus RTU, RS485 @ 9600 baud rate. Two 4-20 mA linear (non-isolated) outputs, user configurable for any combination of dew point or pressure parameters.
Alarms	Process and analyser status via software register and display annotation. Integrated low flow alarms for each sample flow. Analyser status fault flag 23mA on mA output 1.
Remote Interface	Optional for indoor safe area installation
Host capacity	Up to 31 Michell EExd Process Instrumentation Range Analyzers in any combination of models via Modbus
Display	Backlit color 15 cm/6″ LCD
User interface	Integral mouse, on-screen keyboard
Function	View and modify analyser operating settings. Record parameters to file and view virtual chart recorder Analyser diagnostics.
Ports	LAN, USB2, Modbus Retransmission
Data download	CSV (comma separated variable) format for easy import to ExcelTM
Remote access	OPC (OLE for Process Control) over a LAN Imbedded web page/unique IP address for PC access. Remote data reading via modbus RTU.
Power supply	100-280 V, 50/60 Hz
Plant control integration	ActiveX components to be used by software programmers for integration of Modbus protocol into a general plant software system.

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9 Apr 2011 5:14 PM
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HYDROCARBON DEW POINT

CONDUMAX II

Automatic, on-line measurement of hydrocarbon and water dew point in natural gas.

Technical Specifications

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