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Definition(s)

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Branch

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

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Brake Horsepower (BHP)

Effective (useful) horsepower developed by an engine brake. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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Booster Pumps

Mechanical devices used to raise the head of liquid to meet minimum head requirements of the main line pumps downstream. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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Blowout Preventers

High-pressure wellhead valves designed to shut off the uncontrolled flow of hydrocarbons. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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Blooie Line

Large diameter flow line for air or gas drilling that diverts the flow of air or gas from the rig into a pit area. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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Block Valve

Valve that is either open or closed; used to isolated equipment or pipeline sections. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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Bleed Off Line

Component of pressure containment system on a snubbing stack to drain cavity and reduce trapped wellbore pressure. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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Best Efficiency Point (BEP)

Point on the speed- efficiency curve where the pump or compressor is operating at its highest efficiency. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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Bernoulli's Principle

Liquid pressure is inversely proportional to the square of liquid velocity. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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Bernoulli's Equation

Relates to the total energy at two points in an incompressible liquid flowing at a steady rate. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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Base Load

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

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Ball Check Valve

A valve permitting flow in one direction only by lifting a spring-loaded ball off its seat. Valve opens when pressure differential acts in the desired flow direction. The valve seals by forcing the ball tightly against the seat when a pressure differential acts opposite the desired flow direction. Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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Balance

Steady state of flow line or vessel has three critical characteristics:

1. a single flow rate from node to node;
2. an even pack throughout the system; and
3. approximately equal volumes entering and leaving the line or vessel.

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