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 mountainman
Location: Helena, Montana
Gender: Male
 |  |  | interesting "how-to" for draining
< on 1/11/2004 5:20 PM >
|  | | | http://www.twistedinternet.com/library-files/Underground%20Magazines/PHUC/PHUC1~1
go to this site to find the original text.
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..
----Begin
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.
--------------End
Alright guys.. thanks.. i Don't know how useful this information it
is but remember, information is power.
-Spota
spota%[email protected]
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MacGyver
Location: St Paul, Minnesota
Gender: Male
"Someone go find me a paperclip, a D-cell battery, and a cheese grater"
| | Re: interesting "how-to" for draining
<Reply # 1 on 1/14/2004 3:13 PM >
|  | | | good find. it's always good to observe how the professionals do things now and then to make sure you aren't cutting any important corners.
Like a fiend with his dope / a drunkard his wine / a man will have lust for the lure of the mine
"If you are not part of the solution, you are not dissolved in the solvent." |
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