The zero point of an Innage gauging tape is at the bottom of the bob. Innage oil gauging tapes are used with Innage plumb bobs. Sometimes water-finding paste or petroleum paste can be used to help show the mark in very thin liquids. When the tape is reeled back up the depth of the liquid in the tank is read where the tape is wet (like a dipstick in a car). (We have a new plumb bob that has a rubber end tip to help avoid this kind of damage).
Also, if the bob hits the bottom of the tank with too much force, it can damage or puncture the tank. This will cause an inaccurate measurement. Care should be taken to lower slowly so the bob does not reach the bottom and then tilt over. An oil gauging tape measure with a plumb bob is lowered down from the reference point just to the point that the bob touches the bottom of the tank or datum plate. The Innage method will tell you the actual depth of the liquid in the tank. Innage is the more prevalent technique used.
Simply stated, there are 2 techniques to manually gauge the level of liquids in a large storage tank using a tank gauging tape measure-Innage or Outage. So, this question and answer is really geared towards distributors of products generally used in the oil and gas industry.
Define plumb bob manual#
I would have thought, if you needed one of these measuring devices, you would know which one you need, since manual liquid or oil tank gauging is an activity undertaken by professionals, who have been trained in safety procedures and proper techniques. Surprisingly, we get asked this question a lot.
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