Mist Eliminators & Separation Solutions

A **demister pad** (also known as a **mesh mist eliminator**) is a wire mesh device used to remove liquid droplets from gas or vapor streams. It works by causing mist-laden gas to pass through a dense mesh of metal or plastic wires, where the droplets collide, coalesce, and drain away due to gravity. Demister pads are widely used in **separators, scrubbers, and process columns** for efficient mist removal with **low pressure drop**, typically capturing droplets ≥3–5 microns.

A **vane type mist eliminator** is a gas-liquid separation device designed to remove entrained liquid droplets from a gas stream. It consists of a series of angled or curved vanes that force the gas to change direction. As the gas flows through the vanes, liquid droplets collide with the surfaces, coalesce, and drain away, allowing clean gas to exit. It offers **high efficiency** for droplets ≥8–10 microns with **low pressure drop**, making it ideal for use in **separators, scrubbers, and process vessels**.

Product Overview

Shreewire’s Vane Type Mist Eliminators are designed for high-performance separation of liquid particles from gas streams in process systems. These Chevron-type vane packs consist of a series of specially engineered vanes with defined geometry that cause directional changes in the gas flow. The liquid droplets, having higher inertia than the gas molecules, impact the vane surfaces, coalesce, and drain away due to gravity.

Operating Principle

As the gas stream passes through the vane pack, the liquid droplets are forced to change direction multiple times. Due to their inertia, the droplets contact and wet the vane surfaces, particularly in the corrugations. As they accumulate and grow in size, gravity causes them to fall out of the gas stream, effectively removing them before the gas exits the separator.

Efficiency

• Capable of removing over 99.5% of liquid droplets

• Effective for particles ≥ 20 µm and 8 µm, depending on configuration

• High separation efficiency even at high gas velocities and liquid loads

Material of Construction (MOC)

• SS316 / SS314 (other materials available upon request)

Size & Configuration

• Custom-built as per project specifications or quotation

• Available in multiple vane geometries depending on service conditions

Vane Pack Type

• Chevron Type Vane Pack

  • Specially designed vanes with precise flow path geometry

  • Suitable for horizontal or vertical flow

Key Advantages

• Suitable for high velocity gas streams

• Handles high liquid loading and high liquid viscosity

• Resistant to fouling and clogging

• Long corrosion life due to high-grade stainless steel

• Low pressure drop for energy-efficient operation

A **demister pad** (also known as a **mesh mist eliminator**) is a wire mesh device used to remove liquid droplets from gas or vapor streams. It works by causing mist-laden gas to pass through a dense mesh of metal or plastic wires, where the droplets collide, coalesce, and drain away due to gravity. Demister pads are widely used in **separators, scrubbers, and process columns** for efficient mist removal with **low pressure drop**, typically capturing droplets ≥3–5 microns.

What is Shreewire Mist Eliminator?

Shreewire Mist Eliminator is a static, in-line separation device fabricated in pad form from symmetrical interlocking loops of knitted metal wire or plastic monofilaments. With high free volume and a large impingement surface area, the mist eliminator ensures separation efficiency of up to 99% for particles as small as 5 microns, while maintaining a low pressure drop around 25 mm WC.

It can be installed in new or existing process vessels—such as evaporators, scrubbers, and pressure vessels—without the need for special housing. It is virtually maintenance-free, requiring only occasional cleaning in fouling service.

How Does the Shreewire Mist Eliminator Work?

As vapor carrying entrained liquid droplets or mist passes through the Shreewire Mist Eliminator, the vapor moves freely through the layered mesh. The droplets, having greater inertia, impact the wire surface and are temporarily held. As they collect and coalesce, they grow larger and eventually drain back into the system. The result is an overhead vapor stream that is nearly free of liquid.

Efficiency and Performance

• Removes droplets down to 5 microns

• Separation efficiency up to 99%

• Available in multiple mesh styles and materials

• Pressure drop typically less than 25 mm WC; around 5 mm WC in vacuum service

• Special high-efficiency designs available upon request

Applications

Shreewire Mist Eliminators are suitable for a wide range of industrial applications, including:

• Distillation Equipment

• Knockout Drums

• Scrubbers

• Absorbers

• Evaporators

• Vacuum Towers

• Steam Drums

• Strippers and Regenerators

Selection Criteria

The selection and sizing of a Shreewire Mist Eliminator depends on several factors:

• Gas or vapor flow rate and entrained liquid content

• Droplet size distribution and separation efficiency required

• Allowable design velocity

• Physical and chemical properties of the gas and liquid phases

• Material of construction

Installation Details

The mist eliminator consists of a wire mesh pad sandwiched between a top hold-down grid and a bottom support grid. These grids are specially designed with a high percentage of open area to minimize pressure drop.

Key installation requirements:

• The pad is slightly oversized to ensure a tight fit within the vessel

• A 50 to 75 mm wide annular support ring, drilled with 3 to 6 mm diameter holes, should be welded to the vessel wall

• The pad and grid assembly is secured using 2 mm diameter tie wires or spacer pipes with appropriate bolts and fasteners

• Intermediate support beams are recommended for spans larger than 1800–2000 mm