Non-invasive structural health monitoring of storage tank floors
Large above ground storage tanks filled with hydrocarbon and hazardous liquids such as oil, oil-derived products, chemicals and process plant liquids are in widespread use in the UK, Europe and throughout the world. Tank farms are normally located in coastal areas close to large centres of populat...
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| Дата: | 2013 |
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Інститут електрозварювання ім. Є.О. Патона НАН України
2013
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| Цитувати: | Non-invasive structural health monitoring of storage tank floors / V. Dimlaye, P. Mudge, P. Jackson, Tat-Hean Gan, Slim Soua // Автоматическая сварка. — 2013. — № 10-11 (726). — С. 80-82. — Бібліогр.: 3 назв. — англ. |
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Dimlaye, V. Mudge, P. Jackson, P. Tat-Hean, Gan Slim, Soua 2016-06-14T19:01:40Z 2016-06-14T19:01:40Z 2013 Non-invasive structural health monitoring of storage tank floors / V. Dimlaye, P. Mudge, P. Jackson, Tat-Hean Gan, Slim Soua // Автоматическая сварка. — 2013. — № 10-11 (726). — С. 80-82. — Бібліогр.: 3 назв. — англ. https://nasplib.isofts.kiev.ua/handle/123456789/103224 621.791.1:621.642.2/.3 Large above ground storage tanks filled with hydrocarbon and hazardous liquids such as oil, oil-derived products, chemicals and process plant liquids are in widespread use in the UK, Europe and throughout the world. Tank farms are normally located in coastal areas close to large centres of population. Leakage from corroded storage tanks, especially from their floors, is a major environmental and economic hazard and poses a significant threat to those living in the vicinity of tank farms, as well as to the rest of the UK and Europe. The current, and growing, risk of tank failure together with the potential risk for fire and explosion at nearby petrochemical plants is wholly unacceptable. This paper illustrates the work carried out in the UK Technology Strategy Board (TSB) Tank Integrity Monitoring (TIM) project, for the structural health monitoring of large above ground bulk liquid storage tank floors without the need to access the inside of the tank or to empty its contents, using ultrasonic guided waves (UGW) as a non-destructive testing technique. A structural health monitoring system for acquiring ultrasonic guided wave data over long periods of time was developed. The performance of the permanent attached transducers and the structural health monitoring system was also investigated to demonstrate their reliability. The propagation of the guided wave signals has been validated experimentally on a 4 m diameter tank floor, and tomography imaging has been developed for detection and location of defects. The work was sponsored by the Technology Strategy Board (TSB) under the Tank Integrity Monitoring (TIM; www.timproject.co.uk) project. The project was managed by TWI Ltd (UK). The author would like to express thanks for the support from the TIM project partners namely Shell, Vopak and NuStar Energy en Інститут електрозварювання ім. Є.О. Патона НАН України Автоматическая сварка Пленарные доклады Международной конференции Non-invasive structural health monitoring of storage tank floors Неразрушающий контроль конструкционной целостности элементов резервуара Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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DSpace DC |
| title |
Non-invasive structural health monitoring of storage tank floors |
| spellingShingle |
Non-invasive structural health monitoring of storage tank floors Dimlaye, V. Mudge, P. Jackson, P. Tat-Hean, Gan Slim, Soua Пленарные доклады Международной конференции |
| title_short |
Non-invasive structural health monitoring of storage tank floors |
| title_full |
Non-invasive structural health monitoring of storage tank floors |
| title_fullStr |
Non-invasive structural health monitoring of storage tank floors |
| title_full_unstemmed |
Non-invasive structural health monitoring of storage tank floors |
| title_sort |
non-invasive structural health monitoring of storage tank floors |
| author |
Dimlaye, V. Mudge, P. Jackson, P. Tat-Hean, Gan Slim, Soua |
| author_facet |
Dimlaye, V. Mudge, P. Jackson, P. Tat-Hean, Gan Slim, Soua |
| topic |
Пленарные доклады Международной конференции |
| topic_facet |
Пленарные доклады Международной конференции |
| publishDate |
2013 |
| language |
English |
| container_title |
Автоматическая сварка |
| publisher |
Інститут електрозварювання ім. Є.О. Патона НАН України |
| format |
Article |
| title_alt |
Неразрушающий контроль конструкционной целостности элементов резервуара |
| description |
Large above ground storage tanks filled with hydrocarbon and hazardous liquids such as oil, oil-derived products, chemicals
and process plant liquids are in widespread use in the UK, Europe and throughout the world. Tank farms are normally located in
coastal areas close to large centres of population. Leakage from corroded storage tanks, especially from their floors, is a major
environmental and economic hazard and poses a significant threat to those living in the vicinity of tank farms, as well as to the
rest of the UK and Europe. The current, and growing, risk of tank failure together with the potential risk for fire and explosion at
nearby petrochemical plants is wholly unacceptable. This paper illustrates the work carried out in the UK Technology Strategy
Board (TSB) Tank Integrity Monitoring (TIM) project, for the structural health monitoring of large above ground bulk liquid
storage tank floors without the need to access the inside of the tank or to empty its contents, using ultrasonic guided waves
(UGW) as a non-destructive testing technique. A structural health monitoring system for acquiring ultrasonic guided wave data
over long periods of time was developed. The performance of the permanent attached transducers and the structural health
monitoring system was also investigated to demonstrate their reliability. The propagation of the guided wave signals has been
validated experimentally on a 4 m diameter tank floor, and tomography imaging has been developed for detection and location
of defects.
|
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/103224 |
| citation_txt |
Non-invasive structural health monitoring of storage tank floors / V. Dimlaye, P. Mudge, P. Jackson, Tat-Hean Gan, Slim Soua // Автоматическая сварка. — 2013. — № 10-11 (726). — С. 80-82. — Бібліогр.: 3 назв. — англ. |
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2025-11-26T08:05:23Z |
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2025-11-26T08:05:23Z |
| _version_ |
1850615075207905280 |
| fulltext |
80 10-11/2013
UDC 621.791.1:621.642.2/.3
NON-INVASIVE STRUCTURAL HEALTH MONITORING
Of STORAGE TANK fLOORS
V. DIMLAYE1, P. MUDGE1, P. JACKSON2,
TAT-HEAN GAN1 and SLIM SOUA1
1 NDT and Asset Reliability Technology Group, TWI Ltd., Cambridge, CB21 6AL, Great Britain
2 Plant Integrity Ltd., Cambridge, CB21 6GP, Great Britain. E-mail: tat-hean.gan@twi.co.uk
Large above ground storage tanks filled with hydrocarbon and hazardous liquids such as oil, oil-derived products, chemicals
and process plant liquids are in widespread use in the UK, Europe and throughout the world. Tank farms are normally located in
coastal areas close to large centres of population. Leakage from corroded storage tanks, especially from their floors, is a major
environmental and economic hazard and poses a significant threat to those living in the vicinity of tank farms, as well as to the
rest of the UK and Europe. The current, and growing, risk of tank failure together with the potential risk for fire and explosion at
nearby petrochemical plants is wholly unacceptable. This paper illustrates the work carried out in the UK Technology Strategy
Board (TSB) Tank Integrity Monitoring (TIM) project, for the structural health monitoring of large above ground bulk liquid
storage tank floors without the need to access the inside of the tank or to empty its contents, using ultrasonic guided waves
(UGW) as a non-destructive testing technique. A structural health monitoring system for acquiring ultrasonic guided wave data
over long periods of time was developed. The performance of the permanent attached transducers and the structural health
monitoring system was also investigated to demonstrate their reliability. The propagation of the guided wave signals has been
validated experimentally on a 4 m diameter tank floor, and tomography imaging has been developed for detection and location
of defects. 3 Ref., 6 figures.
K e y w o r d s : guided wave, ultrasonic, tank floor, tomography, storage tanks, structural health monitoring system
1. Introduction
Various NDT methods such as penetrant testing,
magnetic particle, radiographic testing, eddy current,
thermography and acoustic emission were used to in-
spect storage tank floors [1,2]. Current inspection meth-
ods require the tank to be drained in order to create a
safe environment, suitable for personnel entry, in order
to carry out inspections which can be time consuming
and expensive. As such, there is a need to develop a fast-
er, lower cost and safer method to assess the structural
integrity of tank floors. The objective of this study was
to develop a structural health monitoring method for the
tank floors using low frequency UGW. The low frequen-
cy UGW have the ability to propagate long distances in
planar and tubular structures and is already used for the
inspection of pipes [3].
2.Experimental Set-Up
2.1.Tank Monitoring System
A 4 m diameter tank floor was used to carry out the
structural health monitoring experiments for damage
locality and detection. The wall thickness of the tank
floor was 7 mm with a seam weld running along the
diameter of the tank floor. The tank is shown in figure 1.
A multitude of transducers were permanently at-
tached around the perimeter of the tank floor. The
commercially available 24 channel Teletest system
and an additional 80 channel multiplexer were used
to collect a broadband frequency range of data. The
botany of the tank floor structural health monitoring
system is illustrated in figure 2.
2.2.Ultrasonic Guided Waves
The ultrasonic guided waves propagating within
the plate structure contain various wave modes; de-
pending on the frequency of excitation, the funda-
mental wave modes generated are the symmetric S0
and asymmetric A0 wave modes. In this study, the
characteristics of the S0 wave mode are used. The
presence of the S0 and A0 in the acquired time do-
main signals is illustrated in figure 3.. Time domain
signals acquired.
3. Result
3.1. Reliability
The structural health monitoring system was used
to collect data continuously over three months. One
very important factor for a robust structural health
monitoring system is the reliability of the transducers
© V. Dimlaye, P. Mudge, P. Jackson, Tat-Hean Gan, Slim Soua, 2013
figure 1. Tank floor of 4 m diameter
8110-11/2013
and electronics. The stability of the aforementioned
transducers, which were studied over the three month
time period, are illustrated in figure 4. Tomography
representation for the stability of transducersfigure
4, the results of which can be displayed using tomo-
grams that were intermittently generated. It can be
seen that the distribution of the energy over the circu-
lar structure is fairly constant over a prolonged peri-
od of time suggesting no failure or degradation in the
performance of the transducers and electronics.
4. Defect Detection and Location
The capability of defect defection in terms of size
and location was studied. A large set of baseline data
were acquired which covers wide environmental con-
dition changes.
A single defect of diameter 70 mm and through
thickness were introduced initially, then a second and
third defect of 70 mm and 20 mm, respectively, were
then added to the tank floor. A set of data was then
collected after each defect addition. The positions of
the defects are shown infigure 5. Defect size and lo-
cation: 70 mm defect (left) and 70 mm, 70 mm, 20
mm defect (right) figure 5.
The tomograms were generated using character-
istics of the S0 wave mode acquired at the opposite
receiving transducers. The detection and location of
the added defects have been made possible by the to-
mography technique used. The tomograms are shown
ifigure 6. Tomograms for 70 mm defect (left) and for 70
mm, 70 mm, 20 mm defects (right)n figure 6.
5. Conclusion
The use of ultrasonic guided waves for the structur-
al health monitoring of storage tanks has been investi-
gated on a 4m diameter tank floor. for the purpose of
figure 2. Tank floor structural health monitoring system
figure 3. Time domain signals acquired
figure 4. Tomography representation for the stability of transducers
figure 5. Defect size and location: 70 mm defect (left) and 70 mm,
70 mm, 20 mm defect (right)
82 10-11/2013
structural health monitoring, it is of paramount impor-
tance to have a reliable system in terms of transducer
performance and a stable pulser-receiver system.
The experiments carried out, based on the data
acquired, demonstrate the stable performance of the
permanently attached transducer and of the pulser-re-
ceiver used. The S0 wave mode from the receiving
transducers has been used to generate the tomograms.
The tomography technique has been successful-
ly implemented alongside the developed structural
health monitoring system for the detection and loca-
tion of defects of 20 mm to 70 mm in size.
6. Acknowledgements
The work was sponsored by the Technology Strat-
egy Board (TSB) under the Tank Integrity Monitor-
ing (TIM; www.timproject.co.uk) project. The project
was managed by TWI Ltd (UK). The author would
like to express thanks for the support from the TIM
project partners namely Shell, Vopak and NuStar
Energy.
1. Cawley, P., Lowe, M.J.S. et al. (2003) Practical long range
guided wave testing application to pipe and rail. Material
Evaluation., 61(1), 66–74.
2. Pei, J., Yousuf, M.I., Degertekin, f.L. et al. (1996) Lamb wave
tomography and its application in pipe erosion/corrosion
monitoring. Research in Nondestructive Evaluation. 8(4),
189–197
3. Sicard, R., Goyette, J., zellouf, D. (2002) A SAfT algorithm
for lamb wave imaging of isotropic plate-like structures.
Ultrasonics, Vol. 39, 487–494.
Recieved 06.06.2013
figure 6. Tomograms for 70 mm defect (left) and for 70 mm, 70
mm, 20 mm defects (right)
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