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The line of sucker rods is represented in this diagram by the solid black line in the center of the well. A sucker rod is a steel rod, typically between 7 and 9 metres (25 and 30 ft) in length, and threaded at both ends, used in the oil industry to join together the surface and downhole components of a reciprocating piston pump installed in an oil well.
The polished rod is connected to a long string of rods called sucker rods, which run through the tubing to the down-hole pump, usually positioned near the bottom of the well. Picture of a pump jack used to mechanically lift liquid out of the well if there is not enough bottom hole pressure for the liquid to flow all the way to the surface.
This template is a convenience template to provide multiple-digit numbers in the rod numeral system. Each parameter is the value to be passed; the template currently can handle up to ten numerals. Each parameter is the value to be passed; the template currently can handle up to ten numerals.
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[[Category:Bar chart templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Bar chart templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
For example, when the material should be both stiff and light, for a rod a combination of high Young's modulus and low density indicates the best material, whereas for a plate the cube root of stiffness divided by density / is the best indicator, since a plate's bending stiffness scales by its thickness cubed.
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The rod is used in levelling procedures to determine elevations and is read using a level. A Philadelphia rod consists of two sliding sections graduated in hundredths of a foot. On the front of the rod the graduation increasing from zero at the bottom. On the back of the rod the graduation decrease from 13.09 ft at the bottom to 7 ft.