Pipeline Pig Travel Speed & Bypass Calculator

Model pipeline inspection (ILI) and cleaning pig velocity from volumetric throughput, and size pig bypass orifices to reduce pig velocity in high-rate gas lines.

Pipeline Flow & Geometry

Pipeline Section Length (miles):

Pipe Inside Diameter ID (in): 24" pipe Sch 40 ≈ 23.25" ID

Pipeline Medium:

Flow Throughput: Liquid: Barrels/Day (BPD)

Pig Body Bypass Fraction (%): Bypass ports slow pig relative to gas flow

ILI Tool Optimum Window (mph): Standard MFL tool: 3 to 8 mph

Pig Velocity & Run Duration

Pig Travel Speed:

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Estimated Run Transit Time (ETA):

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Pig Velocity in Metric:

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Line Barrel Fill Volume:

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Inspection Data Quality Window:

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Displacement Pumping Rate:

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Recommended Tools & Equipment

Tested hardware and components for high reliability

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Inline Inspection (ILI) Pig Travel Speed Rules

Intelligent pipeline inspection pigs (Magnetic Flux Leakage - MFL, Ultrasonic - UT, and Caliper tools) require strict velocity control ($3 - 8 ext{ mph}$) to capture high-resolution magnetic sensor data without sensor lift-off or data saturation.

Pig Speed vs Throughput Relationship

V_pig (mph) = [ Q_bpd / (D_id² · 101.4) ] · (1 - % Bypass)

In high-rate natural gas pipelines, flow velocities often exceed 15-20 mph. Internal flow bypass nozzles are installed in the pig nose to allow a fraction of gas to slip through the tool body, decelerating the pig to legal inspection speed limits.

Pipeline Pig Travel Speed & Bypass Calculator

Pipeline Flow & Geometry

Pig Velocity & Run Duration

Inline Inspection (ILI) Pig Travel Speed Rules

Pig Speed vs Throughput Relationship

Frequently Asked Questions