Absolute Pressure

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Internal pressure that the equipment is designed to contain and/or control, or that is zero-referenced against a perfect vacuum; measured in “psia”.

Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards

Hydrostatic pressure plus applied pressure.

Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards

Pressure measured with respect to zero pressure; the sum of atmospheric pressure and gauge pressure.

Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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