training rigging engineers
TRANSCRIPT
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Development of Course Material
for Training Rigging Engineers
Dannelly Brown
Naval ArchitectJune 14, 2012
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Project Team
NASSCO Initial Design and Naval Architecture Lucas Gray
Dannelly Brown
NASSCO Rigging Engineering
Romeo Moe
Saul Spykerman
NSRP Workforce Development Panel
Mark McCoy
NASSCO Project Liaison
Aris Petrov
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What training is already available?
None.
An ABET-accredited rigging engineer degree or PE license does
not exist.
The only path to knowledge is experience.
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Who is a rigging engineer?
The term “ rigging engineer” is not defined.
Shipyard rigging engineers are often:
Naval architects
Mechanical engineers
Structural engineers
Civil engineers
Weight control
Students should be engineers from a shipyard background,but not necessarily familiar with rigging.
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What is rigging engineering?
Movement by Crane Erections
Material handling
On the ground
Load support during outfitting
Ground transportation
Equipment installation
Testing
UNREP or windlass testing
Compliance Maintenance and inspection of equipment
Course covers this
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Where would a rookie start?
There is nothing thatregulates or teaches engineers:
Margins on weight estimates
Load deflection
Reserve capacity of cranes
Clearances
There is no proper training for: How to conduct a weight estimate
Where to install padeyes
How to evaluate load stability
How would a rookie know to check these,
much less know the answers?
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Training Course Format
This course doesn’t prescribe procedure, but
Reviews existing standards
Points to resources
Discusses areas of risk
Provides guidance for good engineering practice
This course is modifiable to incorporate yard-specificinformation such as:
Crane capacities and reach, spreader bar information
Weight estimation development Stages of Construction
Rules of thumb
Margins
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Training Course Format
The course comprises 8 topics:
Powerpoint Presentation
Student Guide
Instructor Notes
Instructor guide
10-question test
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Dannelly, Slow
Down!
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Rigging
Operations
High Risk LiftUnknown CG
Flexible structure
Impact load
Inclement weather
Pick points below
the CG
More than 1 crane
Water is involved
Cluttered load pathExceeds >75% of
crane capacity
Statically indeterminate
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Lift ing Tools and Vocabulary – Part I
Introduces vocabulary
Discusses cranelimitations andcapabili ties such as
One-crane is saferthan 2 due to reduced
likelihood of becomingoff lead.
Two-cranes allowsingle-axisleveling or angling.One-crane lifts mayresult in point loading.
Talks to the purpose ofspreader bars
Presents various types
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Lift ing Tools and Vocabulary – Part II
Slings
Synthetic
Wire Rope
Chain
Shackles
Padeyes
Common manufacturers and available
information Applicable ASME or OSHA regulation
Maintenance information
Common causes of failure
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Yard Information - yard tour or a powerpoint or both
Cranes (capacit ies, load charts, tracks)
Spreader bars (capacities, typical arrangements)
Storage locations for equipment
Maintenance policies
Standard units, reference points, work package information
Safety margins and high risk areas Documentation policies
Safety information (PPE, walking underneath loads)
Points of contact
It is important to tailor this topic to the audience.For example, a new graduate will require different information
than an ex-foreman who has been to night school.
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Legislation, Standards, and References
OSHA / CFR
ASME B30.20
ASME BTH-1
AWS D14.1
Due to the shortage of applicable standards, the riggingengineer should be familiar with alternative resources and
best practices.
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ASME BTH Standard
Walks through the standard for familiarity
Discusses modes of failure
References papers for design guidance
Points to areas of confusion
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Safety
Load Stabili ty Load and center of gravity
estimation
Communication
Management Pressure
Communication Exceeding the limit of the
facility
Plus Murphy’s Law
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Load Instabil ity
An instable load will overturn if there is any induced angle. An induced angle may be caused by:
Landing on an inclined surface
A poorly estimated center of gravity
Wind
Uneven crane pull
A stable arrangementexamines
Geometry
Moments caused by an
induced angle
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Weight and Center Estimation
Steel
Outfit
Rigging hardware (slings, spreader bars)
Landing equipment (fitt ing aids, pipe shores)
Production support (scaffolding, temporary lighting)
Free ride equipment Immeasurable weights (paint, welding)
Liquids (machinery)
Weight margin
Anything else (rainwater, garbage)
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Padeye Location
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Internal Structure
Reliance on available backup structure
Minimum temporary structure
Minimal load deflection
Minimal welding distortion
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Acceptable Geometry
No interference with outf itting,
especially during 180 turn
Acceptable separation of the
booms
Appropriate spreader bar
selection
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Planning for Later Lifts
Acceptable side load on padeye especially during 180 turn
Preference to downhand welding
Ease of padeye and temporary structure removal
Maximize the padeyes left on the ship
Reuse of padeyes on later lif ts
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Rigging Practice
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How to Obtain the Course
We’ve got copies here if
anyone wants one.
Contact [email protected]
to receive a CD in the
mail.