Outage or Inage Gauging Tape ?
Outage or Inage gauging? Your decision.
What is an Outage Tape used for?
An outage tape is used to measure the distance from the top of a liquid in a tank to the top of the tank, or the part of the tank NOT filled with liquid. Because the exact top of the liquid is hard to find, the graduated 6" (or extended version) plumb bob d(Outage) goes into the top of the liquid. The graduations on the plumb bob start at the point where the bob is attached to the tape (the "zero point") and get higher. The reading on the bob (marked by liquid) is added to the reading on the tape, taken at the top of tank, to get the total empty portion of the tank. Knowing the total depth of the tank, you can subtract the space NOT filled from the total tank depth to determine the depth of the liquid. Multiply the depth times the surface area to get the volume or use the tank table. This type of gauging tape is useful for thick or caustic liquids such as asphalt because the tape does not go into the liquid.
How is an Inage Tape used ?
An inage tape is simply lowered into a tank until the tip of the plumb bob touches the bottom of the tank - usually resting on a datum plate. The "zero point" on an inage bob is at the tip of the bob. When it is reeled up the depth of the liquid in the tank is read ( similar to the dip stick in a car engine) where the tape is wet. Double Duty tapes have a black stripe running the length of the tape to help see the mark on light colored liquids. Water finding paste or petroleum paste can also be used to show the mark in very thin liquids.
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