UBC International Training Fund. Presents. Millwright Training Program. FOR TURBINE ASSEMBLY AND GENERAL INDUSTRIAL BOLTING. PRESENTED IN COOPERATION WITH HYTORC.
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Millwright Training Program
FOR TURBINE ASSEMBLY
AND GENERAL INDUSTRIAL BOLTING
PRESENTED IN COOPERATION WITH HYTORC
The following material is intended to make you awareof 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.
THE WORLD’S LARGEST MAKER
OF HYDRAULIC BOLTING TOOLS
ALWAYS A FEW REVOLUTIONS AHEAD!
In every industry - wherever there is a bolting challenge!
EVERY INVESTMENT MUST PAY FOR ITSELF..
HYTORC PAYS BACK BIGTIME!!
THE GOALS OF THIS COURSE:
To Help You -
1. Increase Your ValueIn The Workplace Because Of Your Skills
2. Increase Your Job Satisfaction As A Professional
3. Become A Safer Worker
Give Me These Tools,
And I Will Give You
The Results You Want.
CHANGE IS HARD FOR SOME PEOPLE...
BUT YOU CAN MAKE A DIFFERENCE!
LET'S GET STARTED!
MANY INDUSTRIES - HUNDREDS OF APPLICATIONS
AT ITS HEART,
HOLDING EVERYTHING TOGETHER IS
THE HUMBLE LITTLE BOLT
LET ME INTRODUCE YOU TO
THERE ARE MANY TYPES OF BOLTS AND STUDS...
BUT THEY ALL HAVE THE SAME BASIC PURPOSE:
Unlike A Pin Or A Clip -
A Bolt Holds Surfaces Together
THE SECRET IS...
A BOLT IS A SPRING
STRETCH THE BOLT AND AS IT SPRINGS BACK
IT SQUEEZES THE JOINT TOGETHER
The Key Is To Get Enough Spring Action
To Hold The Joint Together - But Not Too
Much Stretch So That That The Bolt Yields -
Or No Longer Springs Back
TIGHTER IS NOT ALWAYS BETTER!!
WE CALL THIS
ON THIS FLANGE
24BOLTS@58,000 Lbs. PER BOLT
TOTAL PRE-LOAD 1,392,000 Lbs.
THE TOTAL THE PRE-LOAD
MUST BE GREATER
THAN THE PRESSURES TRYING TO ESCAPE
THERE ARE TWO COMMON WAYS THAT PRE-LOAD
Let’s Briefly Examine The Ways Each Of
These Is Done And Their Relative
Advantages And Problems
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 DISTANCE
OF 1 FOOT FROM THE CENTER
you can double the torque by doubling either
the force or the distance
If you want more torque…
Get a bigger hammer or a longer lever!
By Using A Strain Gauge (Scale) It Is Possible
To Measure How Much Pre-load Is Developed
Per Unit Of Torque Applied To Any Given Bolt
CHANGEWEIGHT OR DISTANCE AND YOU CHANGE LOAD
KEEP IN MIND:
In Bolting We Are Interested In
Pre-load Or Clamping Force Not Torque.
(But Since Load Is Difficult To Measure We
Measure Torque As Away To Approximate Load)
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 The
SINCE THE THREADED BOLT WAS INVENTED PEOPLE
HAVE COME UP WITH SOME VERY CREATIVE WAYS
OF TIGHTENING THEM
(An Accident Waiting To Happen)
Oh, My Aching Back!!
Watch Out Below!!
IMPACT WRENCHES - small and large
Noise And Vibration
Fast Run-down But Fizzle At The End
How Tight Is Tight??
Examples Of Tools Used To Turn A Nut Or Bolt
But None Of These
So People Have Come Up With Some Other Ways
Of Guessing At Load When Using These Tools
With Hydraulics, Unlike Other Methods
We Can Measure The Forces With Great
1. Each Bolt Will Be Exactly Tight Enough
And What Is More Important-
2. Evenly Tight With Its Neighbors