---
title: "Specific collection area (SCA)"
description: "Specific collection area (SCA) is the ratio of total collecting-electrode area to volumetric gas flow rate through an ESP. It is normally expressed in m²/(m³/s) or in ft²/1000 acfm in US practice. SCA is the single most informative sizing parameter for predicting collection efficiency."
canonical_url: "https://sylio.co/glossary/specific-collection-area"
last_updated: "2026-06-28T02:29:31.448Z"
---

**Specific collection area (SCA)** is the ratio of total [collecting-electrode](/glossary/collecting-electrode) area to volumetric gas flow rate through an [ESP](/glossary/electrostatic-precipitator). It is normally expressed in m²/(m³/s) or in ft²/1000 acfm in US practice. SCA is the single most informative sizing parameter for predicting [collection efficiency](/glossary/collection-efficiency).

## Typical SCA ranges

<table>
<thead>
  <tr>
    <th>
      Application
    </th>
    
    <th>
      Typical SCA (m²/(m³/s))
    </th>
  </tr>
</thead>

<tbody>
  <tr>
    <td>
      Coal-fired utility boiler, high-sulphur fuel
    </td>
    
    <td>
      40–60
    </td>
  </tr>
  
  <tr>
    <td>
      Coal-fired utility boiler, low-sulphur fuel
    </td>
    
    <td>
      80–140
    </td>
  </tr>
  
  <tr>
    <td>
      Cement kiln ESP
    </td>
    
    <td>
      60–120
    </td>
  </tr>
  
  <tr>
    <td>
      WtE / biomass
    </td>
    
    <td>
      50–100
    </td>
  </tr>
  
  <tr>
    <td>
      Iron-ore sinter plant
    </td>
    
    <td>
      80–150
    </td>
  </tr>
</tbody>
</table>

Higher SCA buys more efficiency for the same gas flow, but at higher capital cost.

## Effective SCA and fouling

The nameplate SCA assumes clean, fully active plates. As dust builds up, the *effective* SCA falls because the electrical and aerodynamic performance of fouled plates is lower than that of clean plates. Keeping plates clean with [sonic horns](/glossary/sonic-horn) maintains the effective SCA closer to the design value, which is one of the underlying reasons acoustic cleaning extends collection efficiency over the operating cycle.

## Related terms

- [Electrostatic precipitator](/glossary/electrostatic-precipitator)
- [Collecting electrode](/glossary/collecting-electrode)
- [Collection efficiency](/glossary/collection-efficiency)