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F I E L D J O I N T C O A T I N G C O N F E R E N C E
L O N D O N , 2 2 - 2 4 S E P T E M B E R 2 0 1 5 .
Comparative Studies: Grit Blasting and Bristle Blasting
Processes for Field Pipeline Surface Preparation
Professor of Mechanical Engineering
1515 West Wisconsin Avenue
Marquette University
Milwaukee, WI 53233 USA
Robert J. Stango, Ph.D.
Presentation Summary
I Surface Preparation Tools/Processes: FJC and CFR
II Functional Aspects of Grit Blast and Bristle Blast Processes Grit Blast
Bristle Blast
III Comparative Studies: Bristle Blast and Grit Blast Processes Surface cleanliness
Weld cleaning
Texture/anchor profile
Residual stress state
IV Summary/Conclusion
Acknowledgment/Questions/Discussion
l. Surface Preparation Tools/Processes
FJC and CFR
I. Surface Preparation
Processes … continued
Key Issues
Key Issues: ► clean and profile in one step ?
► Texture/anchor profile
► compressive residual stress (enhanced life, SCC resistance) ?
I. Surface Preparation
Processes … continued
Key Issues
Key Issues: ► clean and profile in one step ?
► negligible thermal loading ?
► compressive residual stress (enhanced life, SCC resistance) ?
a a r
II. Functional Aspects of Grit Blast and
Bristle Blast Processes
Grit Blast Process II. Functional Aspects of Grit
Blast and Bristle Blast Processes
apparatus
Grit Blast Process II. Functional Aspects of Grit
Blast and Bristle Blast Processes
mechanics
Grit Blast Process II. Functional Aspects of Grit
Blast and Bristle Blast Processes
mechanics/morphology
Grit Blast Process II. Functional Aspects of Grit
Blast and Bristle Blast Processes
morphology
Bristle Blast Process II. Functional Aspects of Grit
Blast and Bristle Blast Processes
apparatus
Bristle Blast Process II. Functional Aspects of Grit
Blast and Bristle Blast Processes
mechanics
Bristle Blast Process II. Functional Aspects of Grit
Blast and Bristle Blast Processes
mechanics/morphology
Bristle Blast Process II. Functional Aspects of Grit
Blast and Bristle Blast Processes
morphology
III. Comparative Studies: Bristle Blast and
Grit Blast Processes
[left top] As-received corroded pipe section having severe corrosion
[right] bristle blast treated surface (top).
API-5L
corroded piping
III. Comparative Studies:
Bristle Blast and
Grit Blast Processes
SSPC-SP 10 (near-white blast cleaning)
SSPC-SP 5 (white metal blast cleaning)
cleanliness
Bri
stl
e B
last
III. Comparative Studies:
Bristle Blast and
Grit Blast Processes
SSPC-SP 10 (near-white blast cleaning) SSPC-SP 5 (white metal blast cleaning)
cleanliness
welded joint
ABS-A specimen.
III. Comparative Studies:
Bristle Blast and
Grit Blast Processes Texture/anchor profile
Bristle Blast
Grit Blast
Photo micro-graph and profilometry
III. Comparative Studies:
Bristle Blast and
Grit Blast Processes Texture/anchor profile
Bristle Blast
III. Comparative Studies:
Bristle Blast and
Grit Blast Processes Texture/anchor profile
Wilds, N., 2009, NACE Corrosion
Conference, Atlanta, GA
Khullar, P, 2009,, M. S. Thesis,
Marquette University, Milwaukee, WI.
ad
he
siv
e b
on
d s
tre
ng
th
of coating s
yste
ms
III. Comparative Studies:
Bristle Blast and
Grit Blast Processes Residual stress state
Surface/subsurface
deformation
Bristle Blast
III. Comparative Studies:
Bristle Blast and
Grit Blast Processes Residual stress state
Residual stresses measured using x-ray diffraction
[ABS-A bristle blast surface]
Bristle Blast
III. Comparative Studies:
Bristle Blast and
Grit Blast Processes Residual stress state
Bristle Blast
IV. Summary and Conclusion
… Relevance for
Field Joint Coating (FJC) and
Coating Field Repair (CFR) operations
Grit blast and Bristle blast processes
● Process Mechanics/Surface Morphology
● Cleanliness
● Texture/Anchor Profile
● Residual Stress State
Discussion
AC K N O W L E D G E M E N T
S U P P O R T P R O V I D E D B Y T H E P R O J E C T S P O N S O R
M O N T I W E R K Z E U G E , G M B H H E N N E F , G E R M A N Y
I S D E E P LY A P P R E C I AT E D
… A L O N G W I T H D E D I C A T E D F A C U L T Y A N D E F F O R T S O F F O R M E R
M A R Q U E T T E U N I V E R S I T Y G R A D U A T E S T U D E N T S
P I Y U S H K H U L L A R ( M S 2 0 0 9 ) A N D J O R G E M A R T I N E Z ( M S 2 0 1 1 ) .
