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

PLANNING | ENGINEERING | PROGRAM MANAGEMENT

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

PLANNING | ENGINEERING | PROGRAM MANAGEMENT

AWWA Standard for Fiberglass Pipe

AWWA C950 Discusses: • Fabrication Filament wound Centrifugally Cast

• Resins • Testing • Tables Sizes Strengths

PLANNING | ENGINEERING | PROGRAM MANAGEMENT

AWWA Manual of Practice for Fiberglass Pipe Design

AWWA Manual M45 • Design & Installation • Pipe Design Internal Pressure Buckling External Load

• Fittings Design •Joints

PLANNING | ENGINEERING | PROGRAM MANAGEMENT

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!