ubc international training fund
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UBC International Training Fund. Presents. Millwright Training Program. FOR TURBINE ASSEMBLY AND GENERAL INDUSTRIAL BOLTING. PRESENTED IN COOPERATION WITH HYTORC. - PowerPoint PPT PresentationTRANSCRIPT
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UBC International Training Fund
PresentsPresents
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The following material is intended to make you aware
of the currently acceptable and recognized methods of
performing the tasks described in this presentation.
However, every possible application of these methods
cannot be foreseen and the following material is not
designed to cover every potential application. Therefore,
you must always follow all current procedures and safety
regulations whenever you perform any of the tasks
discussed in this presentation.
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HYTORC
• World Wide Coverage
• Customer Specific Solutions
• On-site Training And Support
• Superior Design And Materials
THE WORLD’S LARGEST MAKER OF HYDRAULIC BOLTING TOOLS
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HYTORC Covers the WorldIn every industry - wherever there is a bolting challenge!
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HYTORCEVERY INVESTMENT MUST PAY FOR ITSELF..
HYTORC PAYS BACK BIGTIME!!
•PRECISION = GET THE JOB DONE RIGHT!
•POWER = GET THE JOB DONE FAST!
•PROTECTION = GET THE JOB DONE SAFELY!
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THE GOALS OF THIS COURSE:
To Help You -
1. Increase Your Value In The Workplace Because Of Your Skills
2. Increase Your Job Satisfaction As A Professional
3. Become A Safer Worker
AND...
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YOU NEED TO UNDERSTAND THE WHY AND HOW OF BOLTING
BOSS…Give Me These Tools, And I Will Give YouThe Results You Want.
FASTER SAFER BETTER
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CHANGE IS HARD FOR SOME PEOPLE...
BUT YOU CAN MAKE A DIFFERENCE!
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WHAT YOU WILL LEARN IN THIS COURSE:
• Elements Of Bolting Theory• Advantages And Disadvantages Of Various
Bolting Methods On Common Bolting Problems
• How To Properly Use Gaskets, Tube Compression Fittings And Bolt Locking Devices
• Proper Operation Of Modern Hydraulic Torquing/tensioning Tools
• Hands-on Practical Application Not Just Talk!
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TODAY’S MILLWRIGHT WEARS MANY HATS • Power Plants• Steam Turbines• Generators• Nuclear Reactors• Gas Pipelines• Hydro Units• Diesel/gas Engines• Pumps And Compressors• Structural Assemblies
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AND WAY THE WORK IS DONE AIN’T EXACTLY LIKE YOUR DADDY DID IT!
• Increased Complexity• New And Tighter
Tolerances• Safety And Work Rules• Less Time For Maintenance• Higher Costs
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MANY INDUSTRIES - HUNDREDS OF APPLICATIONS
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NO MATTER HOW BIG AND COMPLEX THE MACHINERY GETS...
AT ITS HEART, HOLDING EVERYTHING TOGETHER IS
THE HUMBLE LITTLE BOLT
LET ME INTRODUCE YOU TO
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THERE ARE MANY TYPES OF BOLTS AND STUDS...
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BUT THEY ALL HAVE THE SAME BASIC PURPOSE:
Unlike A Pin Or A Clip - A Bolt Holds Surfaces Together
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THE SECRET IS...
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STRETCH THE BOLT AND AS IT SPRINGS BACKIT SQUEEZES THE JOINT TOGETHER
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The Key Is To Get Enough Spring ActionTo Hold The Joint Together - But Not TooMuch Stretch So That That The Bolt Yields - Or No Longer Springs Back
TIGHTER IS NOT ALWAYS BETTER!!
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WE CALL THIS SPRING ACTION
ON THIS FLANGE24 BOLTS @58,000 Lbs. PER BOLTTOTAL PRE-LOAD 1,392,000 Lbs.
OR..
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THE TOTAL THE PRE-LOAD MUST BE GREATERTHAN THE PRESSURES TRYING TO ESCAPE
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THERE ARE TWO COMMON WAYS THAT PRE-LOADIS ACHIEVED:
1. TORQUE
2. TENSIONING
Let’s Briefly Examine The Ways Each Of These Is Done And Their Relative
Advantages And Problems
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SOME DEFINITIONS:
TORQUE= ANGULAR MOMENTUM (CIRCULAR FORCE)usually measured in foot/pounds(sometimes also in newton/meters or kilogram/meters)
FOOT/POUND= A TORQUE OF 1 POUND AT A DISTANCEOF 1 FOOT FROM THE CENTERyou can double the torque by doubling eitherthe force or the distance
If you want more torque…Get a bigger hammer or a longer lever!
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By Using A Strain Gauge (Scale) It Is PossibleTo Measure How Much Pre-load Is DevelopedPer Unit Of Torque Applied To Any Given Bolt
CHANGE WEIGHT OR DISTANCE AND YOU CHANGE LOAD
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KEEP IN MIND:In Bolting We Are Interested InPre-load Or Clamping Force Not Torque.
(But Since Load Is Difficult To Measure WeMeasure Torque As Away To Approximate Load)
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The Advantages Of Using Torque Are:
1. It Is Relatively Easy To Measure
2. Even Torque Means Even Load
The Consistency Of Load From Bolt To Bolt…
Is Often More Important Than How Tight TheBolts Are
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SINCE THE THREADED BOLT WAS INVENTED PEOPLEHAVE COME UP WITH SOME VERY CREATIVE WAYSOF TIGHTENING THEM
CHEATER BARS
(An Accident Waiting To Happen)
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HAMMER WRENCHES
Oh, My Aching Back!!Watch Out Below!!
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IMPACT WRENCHES - small and large
Noise And Vibration
Fast Run-down But Fizzle At The End
How Tight Is Tight??
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Examples Of Tools Used To Turn A Nut Or Bolt
But None Of TheseCan Measure How Tight?
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So People Have Come Up With Some Other Ways Of Guessing At Load When Using These Tools
•TORQUE/TURN •BOLT STRETCH
•ULTRA-SONIC •LOAD INDICATORS
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With Hydraulics, Unlike Other Methods We Can Measure The Forces With Great
Accuracy And Consistency
1. Each Bolt Will Be Exactly Tight Enough
And What Is More Important-
2. Evenly Tight With Its Neighbors
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Let’s see if we got these concepts straight…
Quiz #1
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The EndThe End