Slug Catcher Anatomy

The separator/slug catcher consists of several modules — distribution header, separation chambers, dry gas risers, storage harps, and liquids and sludge manifolds.

The distribution manifold takes the incoming gas/liquid stream, slows it down, and splits it into several smaller streams to allow uniform flow into the separation chambers.

In the separation chambers, the majority of the gas liquid separation is accomplished. The required length, size and number of these chambers is a combined function of gas flow, gas chemistry and other known conditions.

The primary function of the dry gas risers is to deliver dry gas back into the system. As some secondary separation occurs here, their sizing is important.
The storage harps hold the liquids at line pressure and the number and length of these harps is determined by the storage requirements, i.e., slug size — 2 phase and residence time — 3 phase. Secondary separation also occurs here.

The liquid and sludge manifolds provide separation of the water, oil and debris. The oil and water are then removed from the storage end for further processing (oil) or reinjection (water). The debris is cleaned out on an as needed basis. When the liquid buildup in the lines is heavy and lines are long, many barrels’ of liquid can collect. When pigging lines, this liquid arrives at the slugging rate and must be stored at pressure or flashed and disposed. In offshore applications and cold climates, thousands of barrels of storage may be required.

PDF of Slug Catcher Brochure

Standard Arrangement

Better Flow - Front end fill higher

Shorter - Separate separator fill higher
Shop Fit Required

Liquid Diverter Sooner Shorter - Separate separator fill higher Shop Fit Required

More about Harp Type Slug Catchers

Harp Type Introduction

Anatomy

Features

The Subsea Slug Catcher