Definition(s)
Passive barrier
Passive barriers are typically “permanent” barriers that are not actuated or routinely disturbed once they are in place, such as the following: cement (and competent underground strata); downhole packers (including seal-bore extensions); downhole components, such as mandrels and valves for gaslift and chemical injection; subsea wellheads (including wellhead gaskets); casing and tubing strings (including hangers and seal assemblies); subsea tree bodies and valve blocks (including interfacing gaskets); pipeline systems (including jumpers, connector bodies, gaskets and pipe); tree and manifold piping; pressure-sealing caps (including gaskets).1
Source(s)
1. API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards