PHUC     Bell Info file #1 (Manholes)
                  information obtained and typed by spota
                  PHUC is:

                  Piz Zart
                  Krazihorz
                  Spota


This file is an excerpt from the Bell issued manual "BSAPP Key Point 
Reference Book #6" it is subject number 23, questions 145-155, which 
are on pages 51-54 of the actual manual..

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MANHOLES

References - BSP 081-310-103 Manhole tent
             BSP 081-700-100, 105, 106, 107, 110, 120, 122
             Gas Indicators
             BSP 620-140-501 Testing and Ventilating Manholes
             BSP 620-140-010 Petroleum Products in Underground
             BSP 620-150-010 Placing and Removing Manhole Covers


D   145.  What do you do prior to the opening of a manhole?

            -Place work area protection devices

DE  146.  How do you test the operation of a gas indicator?

          NOTE: Failure to pass any of the below tests requires
                replacement of the meter or parts thereof. Do not 
                enter a manhole with a defective meter.

            -Test the battery by sqeezing the aspirator bulb five 
             times to clear residual gas and zero in the indicator
             within the limits prescribed by the manufacturer.
        
            -Using a gas test kit allow the gas to enter the meter
             per instructions.

            -The indicator should register readings as prescribed by
             the manufacturer.

            -Test for tightness by squeezing the aspirator bulb. 
             After releasing the bulb should inflate within five 
             seconds.
      
    147.  When do you test for gas in a manhole?

            -Immediately after removing the manhole cover.

            -After purging and entering a manhole

            -A minimum of every two hours after making initial tests.

            -A minimum of one hour if manhole tent is used.

            -When opening a duct.

            -After removal of water from a manhole
       
            -At every shift change.

    148.  How do you remove a manhole cover?

            -One person can remove the cover by placing the feet 
             solidly clear of the cover bending the knees and 
             keeping the back straight.

            -Two persons should first both use their hooks on the 
             same side to break the manhole cover seal. One person
             then moves to the opposite side of the cover and lifts
             and assists while the other person pulls.

            -Frozen manhole covers should never be thawed with an
             open flame. Covers can be loosened with a digging bar
             , hammer or chisel, or by directing a ventilating 
             heater hose at the cover.


    149.  How do you test manhole atmosphere?

            -Lower the free end of the indicator hose to the point 
             where a person's head will be when working in the 
             manhole.

            -If sufficient water is present in the manhole to require
             pumping, hold the sampling hose one foot above the water

            -Draw a sample of the atmosphere through the gas 
             indicator by compressing and releasing the aspirator
             bulb five times plus one squeeze for each five feet of
             sampling hose.

            -Observe the meter pointer continuously from the first
             squeeze of the bulb until the test is completed.

            -If the meter point moves rapidly to the top of the
             scale then returns to a point above zero, a heavy 
             concentration of gas is indicated.

E   150.  What do the different indicator readings mean?

            -A near full scale or full scale movement of the 
             indicator indicates an explosive level of gas.

            -A indicator reading over 1.0 or 100% requires purging 
             and retesting with the blower in operation. If a second 
             test still reads .1 to 1.0 or 10% to 100% do not enter 
             and notify the supervisor

            -An indicator reading below 0.1 or 10% indicates that the
             manhole may be entered after purging.

E   151.  What do you do if gasoline fumes are smelled?

            -Use a gas indicator and a crushed inhibitor filter (if
             required for your indicator) to determine if the 
             atmosphere is safe to work in.

            -Notify your supervisor immediately if required.

 
E   152.  Why must a manhole be purged?
            

            -No manhole should ever be entered unless the manhole is 
             purged for the required time to dissipate any stagnant
             gas, ensure against oxygen deficiency and provide a 
             complete air change in the manhole.

            -The purging time requirements can be found in BSP 
             620-140-501

            -Only one 90(degree) bend in the blower hose is permitted
             while purging.


DE  153.   Where do you locate the ventilating equipment?

            -The blower intake must be away from exhaust fumes.

            -The propane source should be in a secured upright 
             position away from the blower intake and if possible
             lower than the manhole opening.

            -Only two 90(degree) bends are permitted in the blower
             hose ands the end must be secured in a horizontal 
             position directed toward the end wall of the manhole.


D   154.    How do you enter a manhole?

            -Facing traffic and maintaining three points of contact.

            -Use only an appropriate ladder whose first step is no 
             more than one foot below the ground surface.


D   155.    What additional tests are required after entry?

            -Duct entrances, corners and generally throughout the 
             manhole.






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Alright guys.. thanks.. i Don't know how useful this information it 
is but remember, information is power.


        -Spota

                            spota%tacobel@merk.com