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(4) After the air supply has operated for approximately 30 minutes, put the sampling line of the combustible gas indicator (Fig. 205) as far into the fuel tank as possible.
NOTE: It is recommended that you take the combustible gas indicator
____ value regardless of the type of fuel that was contained in the fuel tank. If the fuel tank had contained kerosene only, then the combustible gas indicator should show zero. This shows that the tank atmosphere is in fire-safe and health-safe condition.
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(5)
Wait one minute for each foot of sampling line before you take a reading.
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(6)
Use Table 202 to convert the values on the combustible gas indicator to the actual levels.
NOTE: If you use a combustible gas indicator that is not listed
____ below, follow the manufacturer's instructions to get the actual values.
~................................................................. | TABLE 202 | ................................................................... | COMBUSTIBLE GAS | FOR PPM MULTIPLY | FOR LEL, MULTIPLY | | INDICATOR | VALUE BY: | VALUE BY: | ................................................................... |GASTECH 1314 | 2 | 3 | ................................................................... |GASTECH 1314SMPN | 2 | 3 | ................................................................... |GASTECH GT SERIES | 2 | 3 | 2.....................….....................….....................1
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WARNING: DO NOT USE A HEATER/AIR BLOWER UNTIL THE FUEL VAPOR
_______ CONCENTRATION IS 10% OR LESS OF THE LOWER EXPLOSIVE LIMIT AS SHOWN BY A COMBUSTIBLE GAS INDICATOR. IF THE FUEL VAPOR CONCENTRATION IS NOT 10% OR LESS OF THE LOWER EXPLOSIVE LIMIT, IGNITION OF THE FUEL VAPORS COULD OCCUR.
(7) When the combustible gas indicator shows the fuel vapor concentration is 10% or less of the lower explosive limit, you can put warm or cool air in the fuel tank through the tank access opening with an explosion-proof heater/air blower.
NOTE: The use of warm or cool air is for the comfort of
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