Finger-Type Slug Catcher Volume Sizing Calculator
Determine required liquid surge retention volume (m³), number of storage fingers, and pipe diameter to handle pigging slugs and hydrodynamic transients.
Pipeline Slug & Finger Geometry
Catcher Layout & Pipe Sizing
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Frequently Asked Questions
Why are finger-type slug catchers used instead of single large vessel separators?
For high-pressure gas transmission lines (80–150 bar), a conventional vessel required to hold 300–1000 m³ of liquid would require prohibitively thick forged steel shells (150–250 mm). Finger slug catchers use standard high-strength pipeline grade pipe (X65/X70) arranged in inclined parallel manifolds at a fraction of the cost.
What is the function of the downward slope on slug catcher fingers?
Fingers are sloped downward at 1% to 2% toward the liquid header. This allows gas to disengage upward into the gas header while liquid drains smoothly by gravity into the bottom accumulation manifold.
How does pigging impact slug catcher sizing?
When an intelligent or utility pig sweeps a multiphase gas-condensate line, it pushes the entire accumulated liquid holdup ahead of it in a continuous massive liquid slug, often requiring 3x to 5x more surge volume than normal hydrodynamic slugging.