design of marine loading arms & hose towers for · pdf filedesign of marine loading arms...
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www.sgh.com
Design of Marine Loading Arms & Hose Towers for MOTEMS Compliance
Gayle S. Johnson, P.E.
Simpson Gumpertz & Heger Inc (SGH)Oakland, CA
28 September 2016
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Agenda
• What’s happening in the world of MLAs and hose towers
• Issues with MOTEMS compliance– Seismic
• Future efforts
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Oil products transferred
through marine loading arm
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Oil products transferred
through hoses supported by
tower
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What’s New with MLAs and Hose Towers ?
• 1st MLAs since MOTEMS installed 2015– Last MLA installed in California ~early to mid 2000’s– Previously 1990’s (?)
• 1st Hose Towers designed per MOTEMS being built– Last new hose tower was (ever ???)
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Southern California MLAs
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Northern California MLAs
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New Hose Towers
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New Hose Towers
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Typical Design Practice – MLAs
• MLA designed by vendor– May be international with no knowledge of MOTEMS– Seismic design is pipe stress
• Anchorage and maybe base riser designed by structural engineers– To CBC requirements (ASCE 7)
• Entire design may be subject to local building officials review– Likely CBC / ASCE 7
• Local engineers need to review and coordinate the vendor seismic design– Loads factored properly– Units the same
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MLAs - OCIMF
• 1999 Edition
• Outdated: References “UBC” for seismic design
• No consensus on how to map with ASCE 7
• ASD
• Requires project-specific seismic design basis
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Seismic Design Code Issues - MLAs
• Categorizing structure– Nonbuilding structure– Equipment– Piping
• R / Rp values
• Code-based seismic input
• Period limitations
• Scaling dynamic results
• Drift limitations
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MOTEMS Compliance – not just seismic
• Operating envelope• QC/DC and ERS• Markings• Alarms• Hazard classification• Drainage• Electrical isolation
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Typical Design Practice – Hose Towers
• Designed by structural and mechanical engineers• Seismic design to building codes (ASCE 7 in US)
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Hose Towers
• Looks like a structure
• Straightforward
• Not so fast!!!
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Seismic Design Issues for Hose Towers
• Categorizing structure– Nonbuilding structure similar to building– Penthouse– Pipe support
• Code-based seismic input
• Structure on structure
• Amplification– Elevation– Flexibility
• Cranes on top
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Similar Issues for all Deck-Mounted Equipment & Structures
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ASCE 7
• Chapter 13 (Nonstructural Components) and Chapter 15 (Nonbuilding Structures) both revert to same equation
• 3 separate terms require interpretation
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0.41 2 13.3‐1
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Definition of: SDS ?
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USGS Code-based Spectrum Site-Specific Spectrum
?
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Definition of: 1+2(z/h)?
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“h”? “h”?
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Help is on the way !
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Changes to ASCE 61-19
• Equations will look like ASCE 7, but not reference ASCE 7 explicitly
• Take advantage of single-degree of freedom dynamic behaviors
• Use site-specific spectrum at period of wharf structure, Sw
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1 2
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Proposed Changes to ASCE 61-19
• Choice of “simplified” with amplification of 3 or “coupled” model with dynamic analysis
• Table with choice of Rp values for different items– Rp = 3.0 for MLAs
• Period dependent ap values
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Summary
• First new design and construction of MLAs and hose towers in years is happening now
• First ever with MOTEMS in place
• MOTEMS compliance is a challenge but can be done
• Lessons learned in seismic design will be helpful next time
• Experience in seismic design will be used to improve practice industry-wide
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