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Single-line
Gas Measuring
Station
Based on large-diameter ultrasonic transducers with on-site verification unit
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Single-line Gas Measuring Station
On-site calibration unit
Unattended block of control of physical and chemical indicators of gas
Main ultrasonic measuring complex
Operator's workstation
Main ultrasonic measuring complex
Unattended block of control of physical and chemical indicators of gas
Verification unit at the place of operation
Run calibration
Automated workplace operator
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Description
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Trunkline Ultrasonic Measurement System

The trunkline ultrasonic measurement system (TUMS) is intended for measuring gas flowrate and bringing it to standard conditions. The TUMS is directly integrated into the trunk gas pipeline (from DN 700 mm to DN 1400 mm) and located underground in a special caisson, with access for maintenance.

This measurement system uses a multi-chord layout of measurement channels with immersed piezoelectric angular input sensors. This layout accounts well for the irregularity of velocities in the velocity profile of the measured medium’s flow.

The measurement system's operating principle puts it in the category of time-pulse ultrasonic flow meters. Its operation is based on measuring the time in which the ultrasonic vibration sounding pulse passes through the primary transducer in both flow directions. The electronic module alternates reception and transmission modes of the paired sensor. Ultrasonic wave deflection during gas flow results in a change in the ultrasonic signal propagation period between the sensors. The signal propagation time reduces along the flow, and increases against the flow.

The ultrasonic measurement system has 16 measurement channels: 8 for the main measuring unit and 8 for the backup unit, for continuous monitoring of the main metrological parameters.

The TUMS is a Class A measuring unit in accordance with STO Gazprom 5.37-2011.

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Unattended Unit for Monitoring the Physical and Chemical Parameters of Gas

The Gas Physical and Chemical Parameter (PCP) Unit

Is designed for the automated determination of gas composition and gas quality parameters, presentation of analytical instrument readings and transfer of data of measurement results to a control point. The PCP unit provides measurement of gas component composition up to С6+, the water dew point, the hydrocarbon condensation temperature and oxygen concentration. The PCP unit consists of a Khromos-PGKh-1000 chromatograph (measurement of gas component composition up to С6+), two CONG-Prima-2M dew point transducers (water dew point and hydrocarbon condensation temperature measurement) and an Oxy-V oxygen analyzer (oxygen concentration measurement).

The Khromos PGKh-1000 industrial chromatograph with a gas purification system

Is intended for determining natural gas component composition up to С6+ and calculating physical and chemical parameters according to GOST 31371.7-08.

The CONG-Prima-2М transducer together with the SPG-003 gas purification system

Is intended for measuring natural gas dew point at operating pressure, as well as for filtering the analyzed gas. The inertial-gravity filter within the PG-003 system provides gas purification for all analytical equipment of the PCP unit.

The CONG-Prima-2М dew point transducer together with the SPG-005 gas purification system

Is intended for measuring hydrocarbon condensation temperature at a pressure of 2.7 MPa.

The Oxy-V oxygen analyzer with the SPG-008 gas purification system

Provides continuous in-flow measurement of oxygen concentration in natural gas.

The HyperFlow-UIVK measuring and computing system

Is intended for the collection, storage and presentation of data from the physical and chemical parameter analyzers and the flow meters, forming part of the single-line GMS.

Hydrocarbon condensation temperature analyzer
Process Gas Chromatographs
Measuring and computing complex «HyperFlow-UIVK»
Water dew point analyze
Oxygen Sensor: Oxy-V
Dismantling of the replacement line
Installation of the measuring line with the testing rig
Turning on of the bypass pipeline taps
Turning off the taps on the pipeline, leading to compressor department
Sequential inclusion of a verified ultrasonic flowmeters DN 1400 and the testing rig DN 1000
Verification at the place of operation
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Calibration Unit

The calibration unit is a comparison standard based on a Vympel-500 DN 1000 8-channel ultrasonic gas flow meter. For the time of calibration, the comparison standard is directly integrated into the bypass pipeline of the compressor station. Calibration is performed after the calibrated and reference flow meters are connected in series.

Once the calibration is completed, the reference standard is removed for use at other facilities, and a substitute spool is installed.

In order to calibrate the trunkline ultrasonic measurement system (TUMS) with an accuracy class of 0.5%, the reference standard shall have an overall expanded uncertainty of 0.3% under operating conditions.

The main advantage of the portable reference standard is the ability to “synchronize” the readings of several TUMSs with an error of 0.2%.

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Description
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Operator workstation

The trunkline ultrasonic measurement system (TUMS) is intended for measuring gas flowrate and bringing it to standard conditions. The TUMS is directly integrated into the trunk gas pipeline (from DN 700 mm to DN 1400 mm) and located underground in a special caisson, with access for maintenance.

This measurement system uses a multi-chord layout of measurement channels with immersed piezoelectric angular input sensors. This layout accounts well for the irregularity of velocities in the velocity profile of the measured medium’s flow.

According to the principle of operation, the measuring complex refers to the time-pulse ultrasonic flow meters, whose operation is based on measuring the difference the transit time of the probe pulses of ultrasonic oscillations along the direction of the flow rate of the working medium in the primary converter and against it.

Alternating switching modes " receive-transmit " A pair of sensors is provided by the electronic unit. When the gas moves, the ultrasonic wave is pulled which leads to change the propagation time of the ultrasonic signal between the sensors. The propagation time of the signal over the stream decreases, and against it — is increasing.

The ultrasonic measuring complex has 16 measuring channels: 8 — primary dimension node and 8 — backup for continuous monitoring of the main metrological parameters.

The MUIC is a measurement unit of the class  A in  in accordance with the  STO Gazprom  5.37-2011.

System interface
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Single-line
Gas Measuring
Station
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