Oil, gas & pipelines
Line fill, capacity and displacement for pipelines, drill pipe and gas lines — in barrels, m³ and cubic feet.
Why this topic matters
On the pipeline and rig side, volume becomes line fill, capacity factors and displacement. Line fill is the per-foot capacity times the run length; a barrel here is the 42-US-gallon oil barrel, not a drum; and capacity (what a string holds) is distinct from displacement (what it pushes aside). Small bore errors magnify over miles of line, so these tools insist on the true internal diameter for the grade and schedule, and they report barrels-per-foot so a figure scales cleanly from a jumper to a gathering line. Gas lines add one wrinkle: the geometric volume is the physical space, while the standard-condition quantity also depends on pressure and temperature.
For fieldwork the per-foot capacity is the number to carry: multiply it by the run length for line fill, or by the string length for pipe capacity, and keep capacity and displacement separate on the sheet. Over long runs a small error in the assumed bore compounds, so confirm the grade and wall before committing a figure to a hydrotest or batching plan.
These tools also share a discipline the field rewards: separate the geometry from the operating conditions. The calculators give you the clean geometric capacity; you then adjust for scale, deposits, annular strings or gas pressure in your own procedure. Keeping that split explicit is what makes a barrels figure defensible when it feeds a transfer, a batch interface or a spill estimate.
Tools & guides tagged “Oil, gas & pipelines”
الأسئلة الشائعة
What is line fill?
The volume a pipeline holds when full — its internal capacity. It sets hydrotest water, batch timing and the inventory in an isolated section.
Is an oil barrel 42 or 55 gallons?
The petroleum barrel is 42 US gallons. The 55-gallon figure is a steel drum, a container size, not the barrel used for line volume.
What is the difference between capacity and displacement?
Capacity is the fluid a pipe or string holds inside; displacement is the volume its wall pushes aside when run into a full hole. These tools give capacity — adjust for displacement in your procedure.
How do I get barrels per foot?
Barrels per foot equals the inside diameter in inches squared divided by 1029.4; a 6-inch line holds about 0.036 bbl/ft.
Does gas line volume change with pressure?
The geometric volume does not, but the amount of gas inside does — higher pressure packs more gas into the same space.