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UBC International Training Fund

UBC International Training Fund. Presents. Tensioning. PRESENTED IN COOPERATION WITH HYTORC.

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UBC International Training Fund

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  1. UBC International Training Fund Presents

  2. Tensioning PRESENTED IN COOPERATION WITH HYTORC

  3. 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.

  4. WE SAID BEFORE - THERE ARE TWO COMMON WAYS TO PRE-LOAD A BOLT OR STUD: 1. TORQUE 2. TENSIONING  NOW THAT WE KNOW SOMETHING ABOUT TORQUE LET’S DISCUSS TENSIONING

  5. TENSIONING TENSIONING = STRETCH THE BOLT, LET IT SPRING BACK

  6. TENSIONING 3 WAYS TO TENSION  1. HEAT 2. HYDRAULIC TENSIONERS 3. MECHANICAL TENSIONERS

  7. TENSIONING TENSIONING WITH HEAT

  8. Gas Bolt Heater

  9. Objectives • Correctly setup a gas bolt heater • Properly adjust oxy-acetylene flame • Correctly adjust air flow • Safely operate a gas bolt heater

  10. Design • Heating causes a bolt to grow in length • Relieves tension on bolt • Gas Bolt Heater is machined from solid Stainless Steel • A single bolt heater can be adapted to fit most bolt sizes by changing the heating tube diameter and length

  11. Operation • Select a heating tube that is 1/8” smaller than the hole in the bolt and approximately 3” shorter than the depth of the hole • Install heating tube in bolt heater • Use stainless steel reducing bushing for smaller heating tubes • Use high temperature thread compound • Tighten hand tight • Connect air line to bolt heater • Air pressure should be between 50-100 PSI

  12. Set oxygen pressure to 14 PSI • Set Acetylene pressure to 7 PSI • Use Victor #5-W gas welding tip • Always use check valves • Adjust flame to obtain a carburizing flame • Carburizing flame has an acetylene feather

  13. Insert bolt heater into bolt • Purge bolt cavity with air • Turn air valve off • Insert welding tip into gas bolt heater • Gradually open air valve approximately 1/8 turn • Observe color of heating tube through vent holes in gas bolt heater • Maintain a cherry red color by adjusting air valve • More air is cooler • Less air is hotter

  14. For proper operation a balance of pressure must be maintained between welding tip and heating chamber back pressure • Excess back pressure will result in welding tip back-fire • If back-fire occurs, close acetylene valve, remove welding tip from bolt heater, purge bolt cavity with air, and restart heating process

  15. TENSIONING TENSIONING WITH HEAT (INDUCTION)

  16. TENSIONING TENSIONING WITH HEAT • PRO’S: • MINIMUM MUSCLE • CON’S: • HOT • SLOW • INACCURATE • HARD ON STUDS • MUST HAVE HOLE • ROUGH ON GASKETS

  17. TENSIONING 3 WAYS TO TENSION 1. HEAT  2. HYDRAULIC TENSIONERS 3. MECHANICAL TENSIONERS

  18. TENSIONING HYDRAULIC TENSIONERS

  19. TENSIONING HYDRAULIC TENSIONERS

  20. TOP CONNECT CYLINDER SIDE CONNECT CYLINDER HYDRAULIC NUT VARIOUS TYPE OF HYDRAULIC TENSIONERS

  21. TENSIONING 3 WAYS TO TENSION 1. HEAT 2. HYDRAULIC TENSIONERS  3. MECHANICAL TENSIONERS

  22. JACK SCREW TYPE

  23. TORQUING THE JACK SCREWS • MULTIPLIES WORK • TAKES FOREVER • TINY LOAD POINTS • CAN’T CHECK RESULTS

  24. The End

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