Glossary
Materials and construction
Flange standards (DN and ANSI)
Also known as DN flange, ANSI flange, ANSI 150 lb, flange standards.
DN (EN 1092 European nominal-diameter) and ANSI B16.5 (American National Standards Institute, with pressure classes 150 / 300 / 600 lb) are the two dominant industrial flange standards used for sonic horn mounting to process vessels.
Common horn mounting flanges
| Horn size band | Typical DN flange | Typical ANSI flange |
|---|---|---|
| Small horn (75 Hz, 230 Hz) | DN50–DN80 | 2–3 inch 150 lb |
| Mid-size (60 Hz) | DN100–DN150 | 4–6 inch 150 lb |
| Large infrasonic | DN200+ | 8 inch 150 lb |
Specification practice
European-market horns typically ship with DN flanges as standard, with ANSI options available. North American-market horns ship with ANSI 150 lb as standard. International projects sometimes specify both flange faces (e.g. ANSI weld-neck flange on the horn, DN flange on the vessel adaptor) — this is the integrator's problem to resolve.
Related terms
Related terms
- Bell hornA bell horn is the conical or exponential flare that amplifies and projects sound from an industrial sonic horn's driver into the vessel being cleaned.
- Sonic hornA sonic horn is a pneumatically-driven low-frequency sound emitter (typically 60–400 Hz at 140–180 dB SPL) used to dislodge particulate fouling from boilers, ESPs, baghouses and process vessels.