Glossary
Spray angle
Definition
Cone angle of the spray at the nozzle outlet, selected to match the flame tube of the burner.
The spray angle is the full cone angle of the fuel spray measured at the nozzle outlet, quoted in degrees. Together with the spray pattern it decides how the flame fills the flame tube.
The angle is not an isolated nozzle property: it depends on the fuel pressure, the viscosity and the geometry of the combustion head. A nozzle quoted at 60° at the rated pressure will produce a narrower cone at lower pressure. That is why the angle is always fixed together with the burner head drawing rather than chosen from a table alone.
Fluid Control Instruments Ltd supplies nominal spray angles of 30°, 35°, 45°, 50°, 60°, 70° and 80° for the pressure atomizers, 30° to 80° for the disc atomizer and 20° to 120° for the air/steam atomizer. Intermediate angles are available on request.