Demister Selection Guide
How to choose the right demister grade, thickness and material for your separator, scrubber or column.
Most demisters are replaced like for like, but a change of grade, density or material often fixes a recurring problem: plugging in dirty service, carry-over at high gas load, or corrosion. Use the tables below as a starting point and send us your process data for a sized recommendation.
Dirty-service (DS) grades have open, low-density mesh that resists fouling; general-purpose (GP) grades balance efficiency and pressure drop; high-efficiency (HED) grades use finer wire for small droplets in clean service.
- Round, rectangular, segmented and two-layer pads
- Sizes from 300 mm to above 5.9 m diameter
- York 421-type and other original-make equivalents
- Support grids, tie wires, J-bolts and clamps supplied
- SS304/316L, duplex, Monel, Inconel, Hastelloy, PP, PTFE
- Site measurement and installation support
Typical Oil & Gas Services
Design & Construction
| Pad thickness | 100–150 mm standard; up to 300 mm for difficult duties |
|---|---|
| Pad density | 50–400 kg/m³ (DS, GP and HED grades, see table) |
| Wire diameter | 0.11–0.28 mm typical |
| Efficiency | > 99.5 % for droplets ≥ 3–5 µm (mesh); < 1 µm with fibre beds |
| Pressure drop | About 10–25 mm H₂O clean and dry for mesh pads |
| Sizing | Souders-Brown: Vmax = K × √((ρL − ρG) / ρG); K ≈ 0.10–0.12 m/s for standard mesh, lower for vacuum service |
| Materials | SS304/304L, 316/316L, 321, duplex, Monel 400, Nickel, Inconel, Hastelloy, titanium, PP, PTFE |
Documents Supplied
- Material test certificates to EN 10204 3.1
- Positive material identification (PMI) on alloy parts
- Hydrostatic test certificate (pressure-retaining items)
- Dimensional and visual inspection report
- NDT reports when specified: RT, UT, PT, MT
- Inspection & test plan (ITP) for client witness points
- Painting / surface preparation report and nameplate data
- JKKP documentation for pressure vessels and tanks
Documentation is prepared to your purchase order and ITP. Third-party inspection welcome.
Demister Selection
Knitted-mesh pad grades. DS = dirty service, GP = general purpose, HED = high efficiency.
| Grade | Density (kg/m³) | Surface area (m²/m³) | Voidage | Typical application |
|---|---|---|---|---|
| DS-50 | 50 | 90 | 99.4 % | Heavy fouling, e.g. evaporators |
| DS-80 | 80 | 145 | 99.0 % | Moderate fouling |
| DS-110 | 110 | 200 | 98.6 % | Light fouling |
| DS-145 | 145 | 265 | 98.2 % | Heavy duty, e.g. oil & gas separators |
| GP-170 | 170 | 310 | 97.9 % | General purpose, not totally clean |
| GP-195 | 195 | 355 | 97.6 % | Optimum efficiency and pressure drop |
| GP-240 | 240 | 443 | 97.0 % | High density, high separation efficiency |
| HED-112 | 112 | 375 | 98.6 % | General purpose, clean service |
| HED-145 | 145 | 480 | 98.2 % | Fine droplets, clean service |
| HED-195 | 195 | 650 | 97.5 % | Very high efficiency, clean service |
| HED-400 | 400 | 1284 | 95.1 % | Special applications |
Comparing Mist Eliminator Types
| Type | Droplet size | Efficiency | Pressure drop | Fouling resistance | Typical use |
|---|---|---|---|---|---|
| Wire mesh pad | 3–10 µm | 99.5 % | 10–25 mm H₂O | Low–moderate | KO drums, separators, columns |
| Co-knit mesh | 1–3 µm | 99.8 % | 15–35 mm H₂O | Moderate | Corrosive mists, high purity |
| Vane pack | 10–40 µm | 99 % | 5–15 mm H₂O | High | Dirty gas, high velocity |
| Mesh + vane | 2–10 µm | 99.9 % | 20–40 mm H₂O | High | High liquid-load scrubbers |
| Fibre bed | < 1 µm | > 99.9 % | 100–250 mm H₂O | Low | Acid mist, fine aerosols |
Typical values; final design depends on gas and liquid properties, load and vessel geometry.
From Our Workshop
Related Products
Send Us Your Datasheet or Line List
Tell us the service, size, rating and materials. We reply with a technical proposal, drawing and lead time, usually within two working days.
Call +607 598 5796 / 5797 · [email protected]