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NATIONAL TANKS CONFERENCE & EXPOSITION
“BURIED PIPE AWWA STANDARDS”
Bob Card Lockwood, Andrews & Newnam, Inc.
Chief Pipe Engineer March 20, 2012
© 2009 LEO A DALY All Rights Reserved
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Why Pipe? Pipe and tanks can both be “Buried Structures” or installed above ground. As such both depend on the soil surrounding them to some extent when installed in a buried environment.
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Why worry about loads on pipe?
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AWWA Standard for Steel Water Pipe
AWWA C200 Discusses: • Manufacture • Materials (Steel) • Type of Joints • Production Testing
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AWWA Manual of Practice for Steel Pipe Design
AWWA Manual M11 • Design & Installation • Pipe Design Internal Pressure Buckling External Load
• Fittings Design • Corrosion Protection • Coatings • Joints
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AWWA Standard for Fiberglass Pipe
AWWA C950 Discusses: • Fabrication Filament wound Centrifugally Cast
• Resins • Testing • Tables Sizes Strengths
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AWWA Manual of Practice for Fiberglass Pipe Design
AWWA Manual M45 • Design & Installation • Pipe Design Internal Pressure Buckling External Load
• Fittings Design •Joints
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Internal Pressure
t = PD/2s Where:
t = calculated thickness, inch P = internal pressure, psi D = pipe diameter, inches s = allowable stress, psi
Where:
HDB = hydrostatic design basis, psi FS = safety factor
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Buried Pipe Design
Passive Side Soil Support
Ring Deflection Unacceptable Buckling
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Typical Pipe/Tank Installations
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Ring Deflection
AWWA M11 Steel Pipe Design AWWA M45 Fiberglass Pipe Design
AWWA M45 Ring Bending
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Vacuum & Buckling, Finally.
AWWA M11 Formula for Above Ground Steel Pipe AWWA M11 Formula for Buried Steel Pipe
AWWA M45 Formula for Buried Fiberglass Pipe
AWWA M45 Formula for Above Ground Fiberglass Pipe
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Vacuum Failures?
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Buried Steel Tank Design
UL 58 Formula for Buried Steel Tanks
UL 1316 for Buried Fiberglass Tanks
AWWA M11 Formula for Above Ground Steel Pipe
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Buried Pipe/Tanks with External Pressure
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Major Difference
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AWWA Steel Pipe Coating Standards
C205 – Cement Mortar Lining and Coating C210 – Liquid Epoxy Lining and Coating C213 – Fusion Bonded Epoxy Lining and Coating C214 – Polyethylene Tape Coating C222 – Polyurethane Lining and Coating
Epoxy lining, polyurethane coating Tape coating Cement mortar lining & cement mortar coating
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Thank You Very Much!
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