Back pressure

Pressure resulting from restrictions to fluid flow downstream.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards


Back Pressure

The pressure resulting from restriction of fluid flow downstream.

Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001). Global Standards

Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global Standards


Pressure that exists at the outlet of a pressure-relief device or depressuring valve as a result of the pressure in the discharge system.

  • NOTE The backpressure is the sum of the superimposed and built-up backpressures.

Source:API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards

Backpressure (casing pressure, choke pressure)

The pressure existing at the surface on the casing side of the drill string/annulus flow system.

Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards

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