Proea IS online water analyzer

A cost-effective solution for online moisture measurement of process gases

The moisture content in natural gas is an important indicator in natural gas processing and transportation sales contracts. ProEA IS is a low-cost explosion-proof online moisture analyzer that integrates all experience and professional skills into one, meeting customers' requirements for installation, measurement, display, remote transmission, and measurement standards - ProEA IS.
The measurement of moisture in natural gas is one of the most difficult tasks in the natural gas industry process. Natural gas sources are generally high-pressure, unclean, and corrosive, containing high molecular weight components. Removing moisture is a crucial industrial process before natural gas enters pipelines. The efficiency of the moisture removal process is also crucial for the supplier to fulfill their sales contract obligations responsibly, ensure the good performance and safe transportation of natural gas.
The presence of water vapor at a concentration of 1 ppm per million molecules implies serious and adverse consequences. The lifespan of a pipeline is closely related to the corrosion rate of the fluid inside the pipeline, and the corrosion rate is directly related to the moisture content in the gas that exacerbates oxidation. In addition, the formation of hydroxides can reduce the flow capacity of pipelines and even cause pipeline blockage. When excessive water vapor and liquid combine, hydroxides are produced, which can damage filtration systems, valves, and compressors in industrial processes. During the transmission process, it will condense from the gas into an emulsion, and then form a solid block under pressure conditions. In addition, due to the temperature changes in the main pipeline caused by climate change, low-temperature separators are often used in industrial processes before gas transportation to separate high molecular weight compounds and avoid condensation of these high molecular weight hydrocarbon liquids. The dehumidification dew point of natural gas is lower than the operating temperature of the cooling plant, which is important to prevent flow restrictions caused by freezing issues from affecting the efficiency of the plant.
Given the above reasons, in order to ensure the smooth, efficient, and reliable operation of industrial processes, the standard practice for natural gas production at sea and on land confirms that online measurement of moisture content in natural gas is crucial. The successful design, installation, and operation of industrial humidity measuring instruments for these application scenarios require special, professional, and precise consideration of the natural characteristics and composition of the measured gas, as well as the industrial process technology used.

feature

◆ Intrinsically safe type
◆ Simple, highly cost-effective, low maintenance required
◆ Range -120oC~+30oC Dew Point (0.001~30000ppmv)
◆ It can resist the interference of sulfides and can also be used with H2S content as high as 30% in natural gas (sour gas)
The sampling system can protect the instrument from erosion by alcohols and other liquid pollutants
Accurate direct dew point measurement, with a maximum pressure resistance of 40MPa
Single channel or multi-channel measurement
◆ Traceability of verification standards to NPL (UK) and NIST (USA)
◆ Voltage release contact alarm of process and instrument

Sour natural gas

At present, many natural gas oil fields encounter such difficulties in the production process. When it is necessary to convert the measurement of water dew point to the unit of moisture content, such as humidity, if the gas compounds contain a significant amount of carbon dioxide or hydrogen sulfide, then measuring the water dew point of natural gas becomes an additional challenge. Recently, many oil fields have encountered such "acidic" natural gas. At the same temperature, the humidity required to achieve saturated water vapor pressure in H2S and CO2 will be significantly higher than that in methane or "sweet" gas desulfurization gas compounds. Ignoring the measurement principle, the water dew point measured in sour gas (sulfur-containing natural gas) will be significantly lower than that of "sweet" gas with the same moisture content, namely desulfurized gas. This also requires professional knowledge in the condensation of natural gas components.
In the typical case of sour gas produced by major natural gas producers in northern Germany, the maximum allowable moisture content is set at 50mg H2O/m3 (equivalent to a dew point of -12oC for sweet natural gas at a pipeline pressure of 7MPa, but lower than the dew point of -20oC for natural gas with extremely high sulfur content). This limit is established due to safety standards and enforced by Bergamt (the German federal regulatory agency) to control severe corrosion issues caused by acid gas. The concentration of H2S in natural gas obtained from such sulfur-containing oil fields is generally 9 to 15% (mol), and in some extreme cases can be as high as 33% (mol). In the initial processing of sulfurization production operation, natural gas production, including desulfurization plants, is an important part. Treating the gas in this way before desulfurization means that the design of industrial process plants and humidity analyzers must be considered very comprehensively and thoughtfully. It is evident that corrosion issues are closely related to the characteristics of H2S, which can promote the cracking of sulfide stress on metal materials and potentially lead to fatal consequences of H2S gas leakage. However, the human sense of smell cannot detect H2S gas with a concentration higher than 200 ppm, which is highly toxic to the human nervous system. The application of acid gas measurement requires humidity analyzers to work in highly corrosive gas media. Ceramic humidity sensors have a successful application history of many years in such working environments. The active part of the sensor is made of specialized ceramic materials, and the bottom metal is a naturally inert material that provides good resilience to chemical erosion. The sturdy structural design and carefully selected material combination for the sensor's air wet section enable the sensor to provide reliable service in such working environments.

Convenient intrinsically safe installation
ProEA IS can be used in hazardous environments with safety barriers, ATEX - Ex II 1G EX ia IIC T4, FM - I.S. I 1 ABCD T4 (ta=+60 ° C), CSA - IS Class 1 Div 1 Groups ABCD T4. The sensor and sampling system are installed in a convenient location near the pipeline, with only a sample gas collection port, exhaust pipeline, and 24V DC power provided. The secondary display table and safety barrier are placed in a safe area.

Superb measurement stability
To ensure continuous optimal performance, the ProEA IS sampling system adopts internal temperature control to greatly reduce the impact of potential temperature fluctuations. Temperature fluctuations can cause moisture migration (absorption and release) within various components of the sampling system, leading to measurement errors. The successful case also proves the necessity of maintaining a high temperature in the sampling pipeline. Therefore, from the perspective of user convenience, we can also provide an automatic temperature controlled heat tracing tube as an option for the ProEA IS sampling system.

application

★ Natural gas production and transportation ★ Pipeline drying
★ Export natural gas pipeline ★ Pipeline transportation inspection
★ Natural gas billing and metering ★ Natural gas storage equipment
★ Refinery circulating gas - catalytic reforming ★ LNG product processing and receiving terminal

Communication performance of instrument integration
ProEA IS can provide standard analog and/or digital signals
RS232 signal
◆ 4-20mA standard signal
Users can set alarm relays
◆ Use universal signal cables for instruments

Sampling system
The sampling system for humidity measurement is crucial. Because the humidity sensor must be directly exposed to the measured gas to measure the current moisture, the correct measurement operation requires that the sample gas must go through steps such as particle filtration and liquid pollutant filtration. The ProEA IS sampling system optimized and designed by our company is very perfect.

The following two core designs can be used for single channel or dual channel:

Sampling system for natural gas processing and transportation

It is a reliable solution for the dehydration process of ethylene glycol at sea and on land, as well as for natural gas trade pipelines. Including the most advanced microporous membrane filtration technology and continuous blowing bypass for queuing liquid pollutants; The ethylene glycol adsorption filter removes residual ethylene glycol vapor that may affect humidity signals.

Sampling system for monitoring the moisture content of hydrocarbon gases

The optimized design is used for continuous monitoring of low humidity levels (in the ppmv and ppb range) after molecular sieve dehydration during low-temperature liquefaction of natural gas, and can also be applied to trace moisture monitoring of process gases in many petroleum refining industries. The simplest sampling system design essentially ensures the dynamic response to changes in gas humidity during the process; The particle filter and isolation valve are the only components installed in front of the sensor. Humidity measurement is entirely carried out in a pipeline state, without the use of unnecessary pressure reducing valves and other complex upstream components, ensuring that ProEA IS can continuously maintain consistency with the process gas without any signal lag.

Comprehensive measurement unit
ProEA IS online water analyzer is a robust and durable industrial humidity measurement system that can be used in natural gas platforms and transmission ends, petrochemical plants, industrial gas manufacturing, and other fields to measure high-pressure process gases or vaporized liquid substances. ProEA IS, combined with the latest humidity sensing technology and standard sampling system from Michell Instruments, provides highly reliable and easy-to-use multi-channel online measurement for ordinary and combustible gases.
Simple verification system
Maintaining traceable standards is crucial for all analytical instruments. Special attention should be paid to some viewpoints of "automatic verification", which are non traceable internal checks and cannot actually represent true verification!
The verification and maintenance of ProEA IS is very simple. Xi'an Saipu Automation Instrument Technology Co., Ltd. can provide unique, fast, and up-to-date ceramic sensor calibration and replacement services worldwide, and ensure traceability to the National Institute of Metrology in China. Because standard data is written on the memory circuit board of the sensor, installing and replacing a newly calibrated sensor is equivalent to a new calibration task. This process only requires a short downtime. Users do not need to input any programs or data during the repair and verification process.
The verification and exchange service shortens the time and reduces quality management costs compared to traditional return to factory calibration services. It is recommended to perform a calibration or replacement service for sweet (sour) gas every 6 months.

Advanced sensor technology
ProEA IS uses highly reliable ceramic sensors from the British company Micir, which are widely used in the natural gas and petrochemical industries worldwide. They are very durable, with high sensitivity to measure moisture content up to 10ppbv, and can withstand pressure up to 30MPa.
Michell's advanced thick film semiconductor technology creates highly durable sensors with excellent measurement sensitivity at a micro water content level of 10ppbv, and can withstand pressures up to 40MPa.
Unlike traditional alumina technology, the ceramic substrate of ceramic alumina sensors has unique resistance to pressure impact, which can fully cope with instantaneous pressure changes during operation or shutdown, avoiding sensor fracture and damage. At the same time, the internal characteristics of the sensor enable it to resist corrosive substances in the gas for a long time. The circuit with a microprocessor inside the sensor stores calibration data and provides a stable 4-20mA output, corresponding to a dynamic dew point (ppmv) range. All Michell ceramic humidity sensors have a maximum accuracy of 1oC and excellent long-term stability in process applications.

Ceramic alumina sensors can sense changes in the partial pressure of water vapor in gases, which is directly related to the dew point temperature. At the same time, its unique inertness allows it to withstand the effects of many chemicals for a long time, even in very acidic gases containing a certain percentage concentration (30% H2S). Every ProEA IS sensor is validated in the world's top laboratories at Micir using a benchmark dew point measurement system, internationally recognized and directly traceable to NPL (UK) and NIST (US) standards.

Applicable to all installed projects:
Designed for use in medium to high pressure environments, it can also be used to measure atmospheric dew point by changing the position of the measuring probe.
When measuring acid gas, all sampling pipelines are made of dedicated 36/316L (EN 1.4401/1.4404) stainless steel material that complies with the latest version of NACE MR0175
In all systems, the moisture content and dew point temperature are measured under pipe pressure conditions, thus avoiding any impact caused by depressurization condensation.
Therefore, most of the quality specifications for natural gas handover are directly measured by Xu.
The powerful option functions of ProEA IS sampling system can be customized according to user requirements. All versions of the sampling system offer an open design for on-site analysis of wall installations inside the cabin.
However, for the convenience of installation and cost reduction, the main unit and sampling system of ProEA IS can also be installed in a high protection level cabinet near the gas collection point of the pipeline or processing point. The outdoor installation type uses a stainless steel cabinet with a fixed temperature point heater to ensure that the analyzer operates at a constant ambient temperature. In addition, options are provided, including temperature regulation devices and refrigeration systems, to ensure optimal performance in extreme hot and cold weather conditions.
We recommend sampling pipeline heat tracing in all installation methods. This can prevent the sample gas from condensing in the pipeline and reduce the adsorption effect caused by daily temperature changes.

Technical Specifications
Measurement technology: Micellar ceramic humidity sensor
Sensor model: Easew IS
Measurement range: -120oC~+30oC Dew point
Verification range: -100oC~+20oC dew point
Accuracy:+/-2oC
Measurement resolution: 0.1oC
Display resolution: 0.1oC
Temperature coefficient: compensated for
Operating pressure: maximum 40MPa
Verification: Traceable to the national humidity standards of NPL and NIST
Intrinsic Safety Certificate: ATEX Certified Ex II 1G EEx ia IIC T4
CSA certification Class I, Division 1, Group A, B, C&D, T4
Safety barrier: isolated, internally integrated
Sample gas connection: 1/4 "(or 6mm) card sleeve
Sample gas flow rate: Test channel 0-6L/min
Fast response channel 0-6L/min
Power supply: 90~264V 47~63Hz
Operating environment: Indoor/Outdoor -20oC~+60oC
Maximum humidity 95% RH


Communication and Control
RS232 or 485 digital signal
4-20mA standard signal
Users can set alarm relays
Use instrument universal signal cable
High quality sampling system
Shell: 304 stainless steel, can be upgraded to 316 stainless steel
Installation method: Stainless steel wall mounted
Shell protection: IP66
Box temperature control: Fixed 20oC temperature control heating controller
Or 0~50oC temperature adjustable type
Heater power supply: 220V AC, 50/60Hz Power consumption: 100W
Working conditions: shaded area, onshore or offshore -20~50oC Xi'an Saipu Automation Instrument Technology Co., Ltd