362
Y. Xu et al.
30.4 Results and Conclusions
According to the structural characteristics of three kinds of common double wall
cryogenic tanks, different acoustic conduction methods are adopted in this paper to
realize on-line AE detection of these kinds of tanks. These practices have proved
the practicability and effectiveness of these acoustic conduction methods. Thus, the
technical problems of AE on-line detection of these vertical double-wall cryogenic
storage tanks have been well solved. It is believed that these methods and solutions
on acoustic conduction can provide some reference for colleagues engaged in AE
detection.
In addition, when designing and selecting the appropriate acoustic conduction
mode for vertical double-layer cryogenic tanks, the following suggestions can be
taken:
1. If some components of the tank can transmit the acoustic wave from the inner
tank, and it is also suitable for direct sensor installation to receive these AE
signals, the most direct mode of acoustic transmission should be preferred.
2. When it is necessary to design and make a special wave guide rod or its auxiliary
structure, its structure shall be as simple as possible and easy to make and install,
and its acoustic attenuation shall be as small as possible. At the same time, good
coupling between the waveguide rod and the inner tank wall or between the
auxiliary structure and the fixed rod shall be ensured. After the installation of the
waveguide rod or its auxiliary structure, the overall acoustic conduction effect
still need to be tested.
Reference
1. Y.T. Xu, X.W. Wang, Effectiveness of AE on-line testing results of atmospheric vertical storage
tank floors. PVP2012-78067, Toronto, Ontario, Canada (2012)
2. H.G. Li, G.P. Peng, AE on-line testing of liquid ammonia tanks. Nondestructive Test. Technol.
(04) (2008)
3. Y.T. Xu, Y.D. Wang, Acoustic emission in-service detection of cryogenic storage tank floors, in
17WCNDT World Nondestructive Testing Congress, Shanghai, China (2008)
Y. Xu et al.
30.4 Results and Conclusions
According to the structural characteristics of three kinds of common double wall
cryogenic tanks, different acoustic conduction methods are adopted in this paper to
realize on-line AE detection of these kinds of tanks. These practices have proved
the practicability and effectiveness of these acoustic conduction methods. Thus, the
technical problems of AE on-line detection of these vertical double-wall cryogenic
storage tanks have been well solved. It is believed that these methods and solutions
on acoustic conduction can provide some reference for colleagues engaged in AE
detection.
In addition, when designing and selecting the appropriate acoustic conduction
mode for vertical double-layer cryogenic tanks, the following suggestions can be
taken:
1. If some components of the tank can transmit the acoustic wave from the inner
tank, and it is also suitable for direct sensor installation to receive these AE
signals, the most direct mode of acoustic transmission should be preferred.
2. When it is necessary to design and make a special wave guide rod or its auxiliary
structure, its structure shall be as simple as possible and easy to make and install,
and its acoustic attenuation shall be as small as possible. At the same time, good
coupling between the waveguide rod and the inner tank wall or between the
auxiliary structure and the fixed rod shall be ensured. After the installation of the
waveguide rod or its auxiliary structure, the overall acoustic conduction effect
still need to be tested.
Reference
1. Y.T. Xu, X.W. Wang, Effectiveness of AE on-line testing results of atmospheric vertical storage
tank floors. PVP2012-78067, Toronto, Ontario, Canada (2012)
2. H.G. Li, G.P. Peng, AE on-line testing of liquid ammonia tanks. Nondestructive Test. Technol.
(04) (2008)
3. Y.T. Xu, Y.D. Wang, Acoustic emission in-service detection of cryogenic storage tank floors, in
17WCNDT World Nondestructive Testing Congress, Shanghai, China (2008)