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Media density, pad thickness and material selected for the mist and gas velocity.

Round, rectangular or segmented pads made to fit the vessel. All characteristics

For new equipment or replacement of existing demister pads.

5-Year guarantee

Easy installation and operation

Over 10 years of service life

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Mesh Pad Mist Eliminators

Demister Pads for Scrubbers, Columns and Separators

Capture entrained liquid droplets inside scrubbers, columns and separators and allow the collected liquid to drain.

Mesh Pad Description

REQUEST PDF CATALOG MIST ELIMINATORS

Torch-Air mesh pad mist eliminators, also called demister pads, are separating elements installed in scrubbers, packed towers, absorption columns, separators and mist eliminator housings. They remove liquid droplets, aerosols and fine mist from industrial gas streams.
The pad is made of structured mesh media. Its three-dimensional fiber arrangement forces the gas to change direction continuously, so droplets are captured by impaction, interception and coalescence. Captured droplets merge into larger drops that drain by gravity, back to the process or to a drain, depending on the equipment.
Each pad is designed for the operating conditions of the application. Media density, fiber diameter, pad thickness and material are selected to balance collection efficiency, pressure drop, fouling resistance and service life. Pads are supplied for new equipment and as replacements in existing vessels.
This page covers the pad as a component. For a complete in-line unit with housing, flanged connections, access door and drain, see the OPTIMINATOR two-stage mist eliminator.

Made for the vessel

Pads are available in virtually any diameter, thickness and vessel configuration, for new equipment or retrofit.

High open area

The open media structure limits fouling and plugging in service.

Washable and reusable

Media can be cleaned and reinstalled, which extends its service life.

Mesh Pad Benefits

Media and Materials

The three-dimensional fiber arrangement provides a large collection surface within a compact pad depth.

Polypropylene, PVDF, ETFE, PFA, stainless steel, Hastelloy, Monel and other alloys for corrosive service and elevated temperatures.

Media density and pad thickness are matched to the operating gas velocity range and the allowable pressure drop.

Structured mesh media

Corrosion-resistant materials

Selected for gas velocity

Shapes and Media Options

-1-

Round pad

For round vessels and columns. One-piece or segmented: segments make installation through the access opening easier.

-2-

Rectangular pad

For rectangular housings, ducts and frames, including removable framed cassettes for service access. One-piece or segmented.

-3-

Single-layer or multi-layer media

Round and rectangular pads can both be made as a multi-layer mesh pad. Multi-layer pads combine mesh layers with different structures and densities. The layer arrangement is selected to balance droplet capture, drainage and pressure drop for the application.

Spheres of Use

Mesh pads are installed wherever entrained liquid must be separated from a gas stream.

Scrubbers, packed towers and absorption columns

Final droplet separation after the gas–liquid contact section; replacement of existing demister pads.
Acid systems

Acid gas scrubbers, sulfuric acid systems, chlorine and hydrochloric acid processes.
Metal finishing and pickling lines

Droplets from plating, anodizing and pickling exhaust, with media selected for the chemistry.
Semiconductor and battery manufacturing

Corrosive wet-process exhaust and acidic or alkaline process mist.
Chemical, petrochemical and fertilizer plants

Liquid carryover from process vessels, columns and exhaust systems.
Pharmaceutical, food and wastewater

Compatible process aerosols, water mist and tank exhaust.

QUICK SELECTION BY SECTOR

Material Selection

Material is selected for the gas temperature, chemical concentration, condensate chemistry and abrasion. The options below are representative and require application review.

Material Selection

HURRICANE flow sequence from lower inlet through two separation stages to top outlet

1. Gas reaches the pad. Mist-laden gas flows to the pad face and is distributed across the pad area.

2. Impaction. Larger droplets cannot follow the changing gas path and strike the fibers.

3. Interception. Smaller droplets follow the gas between the fibers and are captured on contact.

4. Coalescence. Captured droplets merge into larger drops on the fiber surfaces.

5. Drainage. The drops drain from the pad by gravity, back to the process or to a drain, depending on the equipment. The cleaned gas leaves the pad.

Specifications

Pad dimensions, media and materials are specified for each vessel. Performance is established for the actual gas velocity, droplet size and liquid loading.

Package

Basic package

The pad is supplied complete for installation in the vessel.

Mesh pad, one-piece or segmented

1 set

Retaining components and fasteners

Set

Pad and support arrangement drawing

Included

Support grids and/or frame to suit the vessel

Set

Segment identification, for segmented pads

Included

Additional package elements

Selected with the client according to the vessel, the mist and the maintenance plan.

ENGINEERING SUPPORT

Media selection for gas velocity, droplet size and liquid loading
Fit check against vessel drawings and access opening
Replacement made to the drawing or dimensions of the existing pad

DESIGN AND FILTER

Multi-layer mesh pads
PVDF, ETFE, PFA, stainless steel or alloy media
FRP support structures
Framed pad cassettes for housings and hoods
Spare pads for planned replacement

Sizes and Ordering Data

Pads are made to order. To size a new or replacement pad, send:

vessel inside diameter, or opening length and width;
required pad thickness, or the thickness of the existing pad;
size of the access opening, to define the number of segments;
support arrangement: support ring, beams, hold-down grid;
pad orientation and gas flow direction;
gas flow rate, temperature and pressure;
mist composition, droplet size and liquid loading;
material requirements and chemical compatibility;
allowable pressure drop and required outlet carryover or removal efficiency.

For a replacement, a drawing or photo of the existing pad and its supports speeds up the selection.

Mesh Pad Design

A pad consists of mesh media held between support grids or in a frame. Large pads are made in segments that pass through the vessel access opening and are joined in place; each segment is marked for assembly. Multi-layer pads combine mesh layers with different structures and densities. The layer arrangement is selected to balance droplet capture, drainage and pressure drop for the application. Retaining components and fasteners are supplied with the pad, and the support grids or frame are made to suit the vessel.

Operation and Maintenance

A differential-pressure gauge across the pad indicates media condition and airflow restriction. Inspect the pad, seals and drain path during scheduled shutdowns: gaps at the vessel wall or between segments let gas bypass the media.

Pads may be washed in place where the chemistry and drainage arrangement allow it, or removed for cleaning. The correct interval depends on contaminant concentration, stickiness, chemical crystallization, gas flow and media density. Damaged media is replaced.