The blow out preventer of claim 1 further comprising a tool string disposed in the blow out preventer.ġ4. The blow out preventer of claim 11, wherein the one or more control valves and fluid in the hydraulic oil control pathways prevent damaging pressure levels as one or more of the at least one pipe ram and the inverted pipe ram open or close in a respective cavity.ġ3. The blow out preventer of claim 1, wherein the pressure management system comprises one or more control valves disposed in hydraulic oil control pathways in fluid communication with control cylinders for opening or closing the at least one pipe ram and the inverted pipe ram.ġ2. The blow out preventer of claim 6, wherein the external equalizing valve manifold comprises a valve which is locked out during pressure testing.ġ1. The blow out preventer of claim 8, wherein pressure in the one or more cavities is adjusted after comparison to atmospheric pressure by fluidly connecting the one or more cavities.ġ0. The blow out preventer of claim 6, wherein the external equalizing valve manifold comprises a valve which senses pressure in one or more cavities defined by the blow out preventer, and compares the pressure to atmospheric pressure.ĩ. The blow out preventer of claim 6, wherein the external equalizing valve manifold comprises an equalizing valve and dual check valves.Ĩ. The blow out preventer of claim 1, wherein the pressure management system is an external equalizing valve manifold.ħ.

The blow out preventer of claim 1, wherein the pressure management system prevents pressure loss as the at least one pipe ram opens in at least one respective cavity.Ħ. The blow out preventer of claim 1, wherein the pressure management system decreases pressure as the at least one pipe ram and the inverted pipe ram close in respective cavities.ĥ. The blow out preventer of claim 1, wherein the pressure management system decreases pressure as the at least one pipe ram closes in at least one respective cavity.Ĥ.

The blow out preventer of claim 1 further comprising a second pipe ram disposed in the blow out preventer body which opens or closes in a respective cavity defined by the blow out preventer body.ģ.

A blow out preventer comprising: a blow out preventer body at least one pipe ram disposed in the blow out preventer body which opens or closes in at least one respective cavity defined by the blow out preventer body an inverted pipe ram disposed in the blow out preventer body which opens or closes in a respective cavity defined by the blow out preventer body and, a pressure management system for adjusting pressure within the blow out preventer below damaging pressure levels as one or more of the at least one pipe ram and the inverted pipe ram open or close in a respective cavity.Ģ.

Bop test ram pressure test