SLIDE 1
Where do we monitor pipelines
- Landslide areas
- Black coal undermined areas (settlement)
Monitoring High Pressure Natural Gas Pipeline Ludek Novosad, - - PowerPoint PPT Presentation
Monitoring High Pressure Natural Gas Pipeline Ludek Novosad, - - PowerPoint PPT Presentation
Long Term Axial Strain Monitoring High Pressure Natural Gas Pipeline Ludek Novosad, Geomonitoring s.r.o., Prague, Czech Republic Where do we monitor pipelines Landslide areas Black coal undermined areas (settlement) How do we measure
SLIDE 2
SLIDE 3
How do we measure axial strain
- 3 spot weldable strain gages in a profile
- Manual measurement with readout box
- Automatic measurement with datalogger
- Pipeline diameters are from 200 to 500mm
SLIDE 4
Position of the sensors
- 3 strain gages in each
profile - every 120°
- distribution of the
strain around circle profile forms a sine curve
- calculation of
maximum, minimum and their position on the circle
SLIDE 5
Sine curve theory
- y1 = a*sin(x1 + b) + c
- y2 = a*sin(x2 + b) + c
- y3 = a*sin(x3 + b) + c
- where
- y1, y2, y3…reading at A,B,C [MPa]
- x1, x2, x3 …A,B,C position [rad]
- a … multiply constant - pipeline
bending
- b … deflection of bending plane
- c … average strain without bending
SLIDE 6
Manual readings
- We started in 1995
- Mostly undermined
areas
- Till now:
- 173 profiles
- 519 strain gages
- They are measured 4
times a year (only the newest once a month)
SLIDE 7
Manual readings graph
Axial Strain Changes in Time
- 180.00
- 150.00
- 120.00
- 90.00
- 60.00
- 30.00
0.00 30.00 60.00 90.00 120.00 150.00 180.00 1.7.2005 30.12.2005 1.7.2006 30.12.2006 1.7.2007 31.12.2007 30.6.2008 30.12.2008 1.7.2009 30.12.2009 1.7.2010 30.12.2010 1.7.2011 31.12.2011 30.6.2012 30.12.2012 1.7.2013 30.12.2013 1.7.2014 30.12.2014 1.7.2015 time axial strain change [MPa] 0.0° 30.0° 60.0° 90.0° 120.0° 150.0° 180.0° 210.0° 240.0° 270.0° 300.0° 330.0° 360.0° A [Mpa] B [Mpa] C [Mpa] average A,B,C [Mpa] average A,B,C [°C] strain change limit value (+) strain change limit value (-) maximum [Mpa] minimum [Mpa] bending = (max - min)*.5 position of maximum [deg] position of minimum [deg]
SLIDE 8
Manual readings graph
Axial Strain Changes in Time
- 50.00
- 40.00
- 30.00
- 20.00
- 10.00
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 1.1.1997 1.1.1998 1.1.1999 1.1.2000 1.1.2001 1.1.2002 1.1.2003 1.1.2004 1.1.2005 1.1.2006 1.1.2007 1.1.2008 1.1.2009 1.1.2010 1.1.2011 1.1.2012 1.1.2013 1.1.2014 1.1.2015 1.1.2016 Time Axial Strain Change [MPa] 0.0° 30.0° 60.0° 90.0° 120.0° 150.0° 180.0° 210.0° 240.0° 270.0° 300.0° 330.0° 360.0° Average A,B,C [Mpa] Average A,B,C [°C] maximum [Mpa] minimum [Mpa] bending = (max - min)*.5 position of maximum [deg] position of minimum [deg]
SLIDE 9
Relation between strain and temperature
SLIDE 10
Automatic readings
SLIDE 11
Pipeline construction
SLIDE 12
Automatic readings history
- Started in year 2000 (249 strain gages, 11
CR10X, 22 MUXs, Siemens M20 modules)
- 2008: New profiles (111 strain gages, 4
CR800, 9 MUXs, Siemens TC35i modules)
- 2012: Dialed GSM connection changed to
IP GPRS and Internet connection
- 2013: AVW1 changed to AVW200
- 2013: Server rental (cloud) with Windows
2008 Server, LoggerNet Admin and VDV
SLIDE 13
Vista Data Vision (VDV)
SLIDE 14
VDV - Data visualization and their control
- Feeding databases with historical data
- Data update
- Battery supply
- Read data evaluation
- rate of change
- percentage of given limits
- setting alarms (e-mails, SMS)
- documentation data storage in the server
SLIDE 15
Battery supply and datalogger temperature since 2000
SLIDE 16
A profile graphs since 2008
SLIDE 17
Maximum and minimums
SLIDE 18
Percentage of maximum and minimum (3 profiles)
SLIDE 19
Rate of change
SLIDE 20
Relation between strain and temperature
SLIDE 21
A profile going to tension
SLIDE 22
Reading improvement after AVW200 installation (RoC)
SLIDE 23