These tape blades have no coating, with numbers and grad lines etched directly into the metal, making them less likely to be worn away by abrasives.Īlthough not as strong as a carbon-plated blade, a stainless-steel tape will hold up better in a caustic or wet environment. Using etched stainless-steel blades can help you avoid abrasive damage. Storing the tape blade in wet environments or neglecting to clean substances from the blade can also cause damage. Abrasive materials such as sand can also shorten the life of the coating. However, more exotic chemicals, acids, bases or a mix of chemicals can affect the outer lacquer. Using these tapes with gasoline, fuel oil, crude oil and other petroleum products should not remove the tape’s protective coating. Oil gauging tapes are plated with chrome nickel and are also double coated with two different lacquers. The tape has a black line along one edge allowing you to see light-colored fluids. USING DOUBLE DUTY TAPEĭouble duty oil gauge tapes allow you to get measurements when working with both light and dark liquids. Both of these standards deal with the method for determining the accuracy of a tank gauging tape and the acceptable deviation. Loop the plumb bob string around a nail or other object. To use a plumb bob, mark the location above the area where you want to draw a vertical line. # A-A-52216 and American Petroleum Institute Standard 2545. A plumb bob is a long string with a piece of weight. HOW ACCURATE ARE THESE TAPES?Īll of our oil gauging tapes meet both Mil Spec. This type of oil gauging tape is good for thick or caustic materials because the tape doesn’t go into the liquid.
You can conclude the volume of the tank by multiplying depth times surface area. When you know the depth of the tank, you can subtract the space that isn’t filled from the total depth to figure out the depth of the liquid. The reading on the bob – as shown by the liquid – is added to the reading on the tape to determine the total empty portion of the tank. The graduations on the bob begin where the bob is attached to the tape and get higher. It’s difficult to determine where the top of the liquid actually begins, so the graduated plumb bob is slowly lowered from the reference point just until it reaches the liquid. In other words, the part of the tank without liquid. The tool was generally a pointed weight on the end of a string and was used in building to ensure walls were being constructed vertically An earlier form of a spirit.
#Homemade plumb bob how to
HOW TO USE OIL GAUGING TAPE – OUTAGE TAPEĪn outage tape measures the distance from the surface of a liquid in a tank to the top of the tank. A plumb bob is a tool that was historically used to establish a vertical or plumb line, it’s a method that is known to have been used at least as far back as ancient Egypt.
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