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SEIKOWAVE Solutions for Infrastructure
Maintenance
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OUR MISSION
COMPANY PURPOSE
SEIKOWAVE INFO
SEIKOWAVE NDT develops infrastructure assessment and repair
solutions
for the energy, chemical, building, and transportation markets
based on
mobile robotic control methods, patented 3D imaging technology
and the
ability to combine these capabilities with other assessment and
repair
technologies.
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IMAGING AND ROBOTICS
PRODUCT FAMILY
3DSL Rhino 3DSL Hippo MT Eagle MR Equus
3DSL Rhino Designed to
meet field requirements
for damage assessment
Damage assessment
underwater
Motion tracking solution;
enables damage
assessment over large
areas
Mobile robotic inspection
platform; integrates with
3DSL and other NDT
Tools
SEIKOWAVE INFO
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THE APPROACH
PIPELINE
INTEGRITY
STEP 1 STEP 2 STEP 3 STEP 4
To prevent explosions Users perform direct
assessment of anomalies
To determine the impact of
corrosion
And identify required
repairs
SEIKOWAVE INFO
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MAXEY’S SURFACE FLAW APPROACH
SEIKOWAVE INFO
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SEIKOWAVE INFO
SEIKOWAVE
BARLOW’S FORMULA
Barlow's formula calculated the maximum internal pressure that a
pipe can withstand using the dimensions and material properties of
the pipe
𝑃 =𝜎𝑜2𝑡
𝐷
Where
P = burst pressure
so = allowable stress
t = pipe wall thickness
D = outside diameter of the pipe
direction of flow
t
D
D
t
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SEIKOWAVE
MAXEY’S SURFACE LAW EQUATION
SEIKOWAVE INFO
Developed in the 1960’s to describe the impact of flaws on
reducing the maximum pressure of a pipe; modifies the stress based
on the surface flaw geometry
𝜎 = 𝜎𝑜
1 − 𝐴
𝐴𝑜
1 − 𝐴
𝐴𝑜𝑀
Where 𝐴 = 𝐿𝑑
𝑑 = 𝑑𝑒𝑝𝑡ℎ 𝑜𝑓 𝑎 𝑟𝑒𝑐𝑡𝑎𝑛𝑔𝑢𝑙𝑎𝑟 𝑑𝑒𝑓𝑒𝑐𝑡
𝐴𝑜 = 𝐿𝑡
𝑀 = 1 +0.8𝐿2
𝐷𝑡
t
D
D
direction of flow
t
d
L
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ORIGINAL B31G
SEIKOWAVE INFO
SEIKOWAVE
𝑃𝑏𝑢𝑟𝑠𝑡 =𝜎𝑓𝑙𝑜𝑤2𝑡
𝐷
1 − 2𝑑3𝑡
1 − 2𝑑
3𝑡𝑀
Where
𝐴 =2
3𝑑𝐿
𝜎𝑓𝑙𝑜𝑤 = 1.1𝑆𝑀𝑌𝑆
𝑀 = 1 +0.8𝐿2
𝐷𝑡
L = defect length
d = maximum defect depth
D = pipe diameter
t = pipe wall thickness
SMYS = Specified Minimum Yield Strength
For defects defined as 𝐿 ≤ 20𝐷𝑡
t
D
D
direction of flow
t
d
L Parabolic defect model for defects
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A SECOND LOOK
MAXEY’S SURFACE FLAW EQUATION
SEIKOWAVE INFO
t
D
D
direction of flow
t
d
L
𝜎 = 𝜎𝑜
1 − 𝐴
𝐴𝑜
1 − 𝐴
𝐴𝑜𝑀
𝐴 = 𝐴𝑟𝑒𝑎 𝑜𝑓 𝑑𝑎𝑚𝑎𝑔𝑒
𝑑 = 𝑑𝑒𝑝𝑡ℎ 𝑜𝑓 𝑎 𝑑𝑒𝑓𝑒𝑐𝑡
𝐴𝑜 = 𝐿𝑡
𝑀 = Bulging stress magnification factor (Folias factor)
What’s the best method to estimate the
area of damage, A?
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INTERACTING PITS
CORROSION
PIPE SCAN
SEIKOWAVE INFO
• Isolated pits that likely interact to form a single
defect
• Data collected using a 3D surface
measurement tool
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INTERACTING PITS
CORROSION
ANALYSIS
SEIKOWAVE INFO
Defect length = 141mm
𝐿 ≤ 20𝐷𝑡 = 225𝑚𝑚
Area model for ASME B31G (1991)
𝐴𝐵31𝐺 =2
3𝐿𝑑 = 408 𝑚𝑚2
Area model of 0.85dL
𝐴0.85𝑑𝐿 = 0.85𝑑𝐿 = 520 𝑚𝑚2
Area model Effective Area
𝐴𝐸𝐴 = 263 𝑚𝑚2
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INTERACTING PITS
CORROSION
PROFILE
SEIKOWAVE INFO
Defines Original ASME B31G boundary for area estimation
Defines 0.85dL boundary for area estimation
Corrosion (River bottom) Profile
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Q&A
SEIKOWAVE INFO
