Oil Country Tubular Goods 

Pressure in an annular area. May be a vented or trapped annuli.

American Petroleum Institute - issues standards for oil & gasindustry​

A unit ​of volume measurement for petroleum products - 7.33 barrels = 1 tonne, 6.29 barrels = 1 cubic metre.​

Barrel of Oil Equivelant. The amount of energy resource that is equal to one barrel of oil on an energy basis.​

Buttress Threaded and Coupled​

Internal pressure at which tube will yield.​