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TORQUE  WRENCHES
Chapter 12 Shipboard Electrical Equipment

Fireman - Navy Firefighter, Fireman training manual
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Figure 11-26.—Torque wrenches. use it. When using deflecting-beam or dial-indicating wrenches, hold the torque at the desired value until the reading  is  steady. Torque  wrenches  are  delicate  and  expensive  tools. When using them, always follow these precautions: l l l l l l When you use the micrometer-setting type, do not move the setting handle below the lowest torque setting. However, place it at its lowest setting  before  you  return  it  to  storage. Do not use the torque wrench to apply greater amounts of torque than its rated capacity. Do not use the torque wrench to break loose bolts that  have  been  previously  tightened. Do not drop the wrench. If a torque wrench is dropped,  its  accuracy  will  be  affected. Do not apply a torque wrench to a nut that has been tightened. Back off the nut one turn with a nontorque wrench and retighten it to the correct torque with the indicating-torque wrench. Calibration intervals have been established for all torque tools used in the Navy. When a tool is calibrated by a qualified calibration activity at a shipyard, tender, or repair ship, a label showing the next calibration due date is attached to the handle. Before you use a torque tool, check this date to make sure the tool is not overdue for calibration. SUMMARY Only a few of the many types of instruments used by  Navy  personnel  have  been  covered  in  this  chapter. For  the  operating  principle  of  individual  systems,  you should consult the specific equipment technical manuals and the NSTM, chapter 504. Just as we monitor automobile instruments (oil pressure gauge/light, fuel tank level indicator, water temperature gauge, and so forth) to determine how an automobile   is   operating,   we   use   instruments   to determine how the engineering plant is operating. In addition  to  the  use  of  visual  indicating  equipment  in  an engineering  plant,  audible  alarms  warn  operating personnel of actions required or of unsafe conditions that  are  approaching.  You  may  avoid  machinery damage,  personnel  injury,  and  expensive  and time-consuming  repairs  by  taking  proper  operator action.  However,  proper  operator  actions  can  take  place only when the instruments (temperature indicators, pressure  gauges,  and  so  forth)  are  properly  calibrated and  properly  interpreted  by  operating  personnel. 11-15






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