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Description
Lel-М /A-Line 32D (DDM-M)/ - system of continuous structural health monitoring of hazardous industrial objects of the enterprises of oil and gas producing, oil and gas treating, petrochemical, chemical and other industries dependent on Rostekhnadzor of the Russian Federation.
It is hardwarily implemented as a distributed system of diagnostic data acquisition and processing. It incorporates the central computer station (CCS), wiring closet of galvanic isolation and power supply (WCGI), testing, measuring and switching units (CMSU), concentrators and a set of digital multipurpose measuring modules in explosion-proof version (MMEPV).
Lel M/A-Line 32D (DDM-M)/, structural health monitoring system (SHM-system) is certificated for conformity to the requirements of the All-Union State Standard (GOST) R 51330.0-99 (IEC 60079-0-98), GOST R 51330.1-99 (IEC 60079-1-98), GOST R 51330.10-99 (IEC 60079-11-99), regulating the application of electrical equipment in the explosion hazard zone and is certified flameproof 1Exd[ib]IIСТ6, or 1Exd[ib]IIВТ6, or 1Exd[ib]IIАТ6.
Different variants of system configuration intended for solving a wide spectrum of problems can be implemented on the base of Lel-M /A-Line 32D (DDM-M)/.
Primary system members:
Central computer station
provides accumulation and precise analysis of all the data received, their display, decision-making and formation of operating commands for multipurpose measuring modules and the executive equipment. 
Wiring closet
device designed for power supply and galvanic isolation of concentrators and measuring lines. WCGI carries out galvanic isolation between the primary voltage 220V/50Hz and the secondary voltage of the direct current of 48V delivered to the line of cascading MMEPV, as well as optron galvanic isolation to the data transmission channel. 
Control, measuring and switching unit
designed for measurement of analog signals coming from gauges, formation of command analog signals for external executive devices and switching of measuring and executive circuits. Structurally CMSU represents a holder with the established motherboard with channel boards installed in the slots:
- MC is a current loop measuring channel for registration of slowly varying parameters, from the primary or secondary converters equipped with a current output of 4-20 mА;
- CC is a current loop command channel for management of various devices equipped with a command current input of 4-20 mА;
- SC is a switching channel providing switching of external circuits by means of the relay in a controlled pattern.
Measuring line (cascading line of MMEPV)
channel of command, management, synchronization, data transmission and power supply providing connection of multipurpose measuring units to the concentrator or WCGI. 
Concentrator
explosion-proof communication device providing securing support of several measuring lines for connection of multipurpose measuring units and equipped with high-speed digital communication channel (Ethernet) for communication with the central computing station. 
Multifunctional measuring unit
device providing galvanic isolation of measuring channels, reception of analog signals from diagnostic and parametrical sensors, their transformation into a digital form and the subsequent processing.
- Each unit can contain a combination of up to three blocks of measurement or formation of signals of the executive equipment command:
- AE is a channel for registration of acoustic waves; the channel contains analog and digital frequency filters, an amplifier, an analog-digital converter, a digital amplitude comparator, computers for calculation of characteristics of AE signals;
- MCC is the current loop measuring channel for registration of slowly varying parameters from the primary or secondary transducers equipped with a current output of 4-20 mA;
- CCC is the current loop command channel for command of different devices equipped with the command input of 4-20 mA;
- PB is the power bridge channel for measurement of drift of resistance in of the resistive bridge sensor arm from the originally established rate.
Acoustic emission sensors
applied to registration of acoustic emission signals coming from plastic strain of solid media, development of defects (cracks, microcracks, delamination, corrosion, hydrogen embrittlement, etc.), friction, leak (escape of liquid and gaseous media through defects). 
Pressure transducers
used for registration of values of superfluous pressure, underpressure, superfluous pressure-underpressure, absolute pressure, the difference of pressures and hydrostatic pressure (level) of liquid and gaseous, including corrosive media in the objects under investigation. 
Strain gages (resistive strain sensors)
applied to estimation of the stress-strain state of a structure and also for increase of reliability of the results of the acoustic emission tesing and other methods of monitoring used in TDM system. 
Corrosion sensors
serve for measurement of the corrosion speed by the method of electric resistance (ER) or the method of linear polarization resistance (LPR). 
Vibration sensors (current output vibration velocity sensors)
intended for transformation of average mean values of vibration velocity in tested points of the units and equipment into direct current. 
Temperature sensors (resistance sensors, thermoelectric transducers)
for measurement of the temperature of liquid and gaseous media, the working surface temperature of the tested objectl. Optional system elements:
Automated workplace (AWP) is a device used for remote access to the central computer station for reserve copying of the information and the unit setting. The automated workplace also is used for monitoring data processing and preparation of reports on the system operation.
Display
Printer
Uninterruptible power supply
Weather station is a complex of measuring devices for test of temperature and air humidity, atmospheric pressure, speed and direction of the wind, presence of precipitation. It is delivered in case of need to account the influence of meteorological factors on the work of monitoring system or the tested object.
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Characteristics
General parametersSupply voltage for Central computer station, Communication and service device, Intermediate station (technologic node)
- voltage, V
- frequency, Hz
220
50Maximum number of Measuring modules in CDM system, not over, pcs768Maximum number of measuring channels in CDM system, not over, pcs2304Measuring moduleNumber of simultaneously used channels for measuring, control,
communication and switching6Composition of channels for measuring, control, communication and switching:
- acoustic emission channel;
- current loop measuring channel;
- current loop control channel;
- bridge measuring channel.Data transmission typedigital self-synchronizing codeCable typetwisted pairMaximum cable length between adjacent Measuring modules, m120Galvanic isolation, not less than, V500Operating temperature range, °С-40 ÷ +60Supply voltage, V48Power consumption, not over, W10Weight, not over, kg5Acoustic emission channelOperating frequency range, kHz1÷1000 (15÷500 in standard version)Gain slope:- analogue filter, dB/octave22- digital filter, dB/octave60Bandpass flatness, dB+1/-3Maximum measured amplitude of AE signal, dB94Accuracy of AE signal amplitude measuring, dB± 1Noise in the operating frequency range, not over, µV5Accuracy of measuring time parameters, µs1AE channel performance, not less than, events/channel1000Current loop measuring channelOperating range, mA4 ÷ 20Accuracy, %0,2Current loop control channelOperating range, mA0 ÷ 20Maximum load resistance, Ω600Accuracy, %0,2Bridge measuring channelOperation modes¼ of bridge, ½ of bridge, full bridgeMinimum bridge resistance, Ω120Accuracy, %0,1 -
Application
Main gas pipeline crossing under railways
Basic elements of a monitoring system
Module for control, measurement and commutation (MCMC)
Central computing station using satellite communication
Satellite
Remote terminalSensors
Аcoustic emission sensor
Corrosion sensor
Cup rum-sulphat comparison electrode
Strain gage
Gas sensor
Sensor for electrolyte contact presence
Temperature sensor
Acoustic emission system for the chain mount component of the skating-rink
Basic elements of a monitoring system
Multifunctional measurement module
Concentrator
Сentral computing station (CCS)
Meteorology stationSensors
Аcoustic emission sensor
Stationary AE monitoring of isothermal tanks
Main elements of a stationary AE monitoring system:
MNM multifunctional measurement module
MNC concentrator
SHM power supply device
SHM serverSensors:
Аcoustic emission sensor
Input/outlet pipe vibration sensor
Gas analyzer of the interwall space
Gas phase pressure sensor
Liquid phase pressure sensor
Space temperature sensor between tank shells
Foundation temperature sensor
Foundation plate slope sensor
Lel-М /A-Line 32D (DDM-M)/ - system of continuous structural health monitoring of hazardous industrial objects of the enterprises of oil and gas producing, oil and gas treating, petrochemical, chemical and other industries dependent on Rostekhnadzor of the Russian Federation.
It is hardwarily implemented as a distributed system of diagnostic data acquisition and processing. It incorporates the central computer station (CCS), wiring closet of galvanic isolation and power supply (WCGI), testing, measuring and switching units (CMSU), concentrators and a set of digital multipurpose measuring modules in explosion-proof version (MMEPV).
Lel M/A-Line 32D (DDM-M)/, structural health monitoring system (SHM-system) is certificated for conformity to the requirements of the All-Union State Standard (GOST) R 51330.0-99 (IEC 60079-0-98), GOST R 51330.1-99 (IEC 60079-1-98), GOST R 51330.10-99 (IEC 60079-11-99), regulating the application of electrical equipment in the explosion hazard zone and is certified flameproof 1Exd[ib]IIСТ6, or 1Exd[ib]IIВТ6, or 1Exd[ib]IIАТ6.
Different variants of system configuration intended for solving a wide spectrum of problems can be implemented on the base of Lel-M /A-Line 32D (DDM-M)/.
| Primary system members: | |
|
Central computer station |
provides accumulation and precise analysis of all the data received, their display, decision-making and formation of operating commands for multipurpose measuring modules and the executive equipment. |
|
Wiring closet |
device designed for power supply and galvanic isolation of concentrators and measuring lines. WCGI carries out galvanic isolation between the primary voltage 220V/50Hz and the secondary voltage of the direct current of 48V delivered to the line of cascading MMEPV, as well as optron galvanic isolation to the data transmission channel. |
|
Control, measuring and switching unit |
designed for measurement of analog signals coming from gauges, formation of command analog signals for external executive devices and switching of measuring and executive circuits. Structurally CMSU represents a holder with the established motherboard with channel boards installed in the slots:
|
|
Measuring line (cascading line of MMEPV) |
channel of command, management, synchronization, data transmission and power supply providing connection of multipurpose measuring units to the concentrator or WCGI. |
|
Concentrator |
explosion-proof communication device providing securing support of several measuring lines for connection of multipurpose measuring units and equipped with high-speed digital communication channel (Ethernet) for communication with the central computing station. |
|
Multifunctional measuring unit |
device providing galvanic isolation of measuring channels, reception of analog signals from diagnostic and parametrical sensors, their transformation into a digital form and the subsequent processing.
|
|
Acoustic emission sensors |
applied to registration of acoustic emission signals coming from plastic strain of solid media, development of defects (cracks, microcracks, delamination, corrosion, hydrogen embrittlement, etc.), friction, leak (escape of liquid and gaseous media through defects). |
|
Pressure transducers |
used for registration of values of superfluous pressure, underpressure, superfluous pressure-underpressure, absolute pressure, the difference of pressures and hydrostatic pressure (level) of liquid and gaseous, including corrosive media in the objects under investigation. |
|
Strain gages (resistive strain sensors) |
applied to estimation of the stress-strain state of a structure and also for increase of reliability of the results of the acoustic emission tesing and other methods of monitoring used in TDM system. |
|
Corrosion sensors |
serve for measurement of the corrosion speed by the method of electric resistance (ER) or the method of linear polarization resistance (LPR). |
|
Vibration sensors (current output vibration velocity sensors) |
intended for transformation of average mean values of vibration velocity in tested points of the units and equipment into direct current. |
|
Temperature sensors (resistance sensors, thermoelectric transducers) |
for measurement of the temperature of liquid and gaseous media, the working surface temperature of the tested objectl. |
| Optional system elements: |
|
|
Automated workplace (AWP) is a device used for remote access to the central computer station for reserve copying of the information and the unit setting. The automated workplace also is used for monitoring data processing and preparation of reports on the system operation. Display Printer Uninterruptible power supply Weather station is a complex of measuring devices for test of temperature and air humidity, atmospheric pressure, speed and direction of the wind, presence of precipitation. It is delivered in case of need to account the influence of meteorological factors on the work of monitoring system or the tested object. |
|
|
General parameters |
|
|
Supply voltage for Central computer station, Communication and service device, Intermediate station (technologic node) - voltage, V - frequency, Hz |
220 50 |
|
Maximum number of Measuring modules in CDM system, not over, pcs |
768 |
|
Maximum number of measuring channels in CDM system, not over, pcs |
2304 |
|
Measuring module |
|
|
Number of simultaneously used channels for measuring, control, communication and switching |
6 |
|
Composition of channels for measuring, control, communication and switching: - acoustic emission channel; - current loop measuring channel; - current loop control channel; - bridge measuring channel. |
|
|
Data transmission type |
digital self-synchronizing code |
|
Cable type |
twisted pair |
|
Maximum cable length between adjacent Measuring modules, m |
120 |
|
Galvanic isolation, not less than, V |
500 |
|
Operating temperature range, °С |
-40 ÷ +60 |
|
Supply voltage, V |
48 |
|
Power consumption, not over, W |
10 |
|
Weight, not over, kg |
5 |
|
Acoustic emission channel |
|
|
Operating frequency range, kHz |
1÷1000 (15÷500 in standard version) |
|
Gain slope: |
|
|
- analogue filter, dB/octave |
22 |
|
- digital filter, dB/octave |
60 |
|
Bandpass flatness, dB |
+1/-3 |
|
Maximum measured amplitude of AE signal, dB |
94 |
|
Accuracy of AE signal amplitude measuring, dB |
± 1 |
|
Noise in the operating frequency range, not over, µV |
5 |
|
Accuracy of measuring time parameters, µs |
1 |
|
AE channel performance, not less than, events/channel |
1000 |
|
Current loop measuring channel |
|
|
Operating range, mA |
4 ÷ 20 |
|
Accuracy, % |
0,2 |
|
Current loop control channel |
|
|
Operating range, mA |
0 ÷ 20 |
|
Maximum load resistance, Ω |
600 |
|
Accuracy, % |
0,2 |
|
Bridge measuring channel |
|
|
Operation modes |
¼ of bridge, ½ of bridge, full bridge |
|
Minimum bridge resistance, Ω |
120 |
|
Accuracy, % |
0,1 |
Main gas pipeline crossing under railways
Basic elements of a monitoring system
Module for control, measurement and commutation (MCMC)
Central computing station using satellite communication
Satellite
Remote terminal
Sensors
Аcoustic emission sensor
Corrosion sensor
Cup rum-sulphat comparison electrode
Strain gage
Gas sensor
Sensor for electrolyte contact presence
Temperature sensor
Acoustic emission system for the chain mount component of the skating-rink
Basic elements of a monitoring system
Multifunctional measurement module
Concentrator
Сentral computing station (CCS)
Meteorology station
Sensors
Аcoustic emission sensor
Stationary AE monitoring of isothermal tanks
Main elements of a stationary AE monitoring system:
MNM multifunctional measurement module
MNC concentrator
SHM power supply device
SHM server
Sensors:
Аcoustic emission sensor
Input/outlet pipe vibration sensor
Gas analyzer of the interwall space
Gas phase pressure sensor
Liquid phase pressure sensor
Space temperature sensor between tank shells
Foundation temperature sensor
Foundation plate slope sensor