Calculators›Slug Catcher Sizing
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Slug Catcher Sizing Calculator

GPSA Ch. 7 API 1160 ASME B31.8

Slug Catcher Type:
Multiple parallel pipes for high-pressure gathering systems. Common for onshore gas processing inlet facilities.

Pipeline Parameters

inches
miles
ft
Total elevation change along pipeline route

Operating Conditions

psig
°F
MMscfd

Fluid Properties

air=1
water=1
Condensate: 0.60-0.80, Crude oil: 0.78-0.95
cP
cP

Slug Source

Terrain slugs form in hilly pipelines where liquid accumulates in low spots.
×
Applied to estimated slug volume. Typical: 1.3-2.0

Design Parameters

min
Buffer for downstream processing. Typical: 3-10 min
inches
Typical: 24"-48" OD pipe for fingers
ft
Typical: 100-400 ft per finger

Learn the Theory

Slug formation, pipeline transients, finger vs. vessel design, and liquid holdup fundamentals

Read Engineering Guide

Engineering Basis

Slug Volume Estimation
V_slug = A_pipe × L_slug × H_L

Pipeline slugs form from terrain undulations, pigging operations, or production rate changes. Volume depends on holdup and pipeline geometry.

Pigging Slug
V_pig = A_pipe × L_pipe × H_L × η_pig

During pigging, the pig sweeps liquid ahead of it. Slug volume equals pipeline liquid inventory times pig sweep efficiency (~80%).

GPSA Ch. 7 & 9 API 1160 ASME B31.8

Slug Catcher Quick Reference

Finger typeHP gathering
Vessel typeLP / offshore
Pigging slugLargest volume
Design factor1.3 – 2.0×
Retention3 – 10 min

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