User Guide

9
Spray Angle
Spray angles are available from 30° through 90° in most nozzle
sizes to meet the requirements of a wide variety of burner air
patterns and combustion chambers.
Usually it is desirable to fit the spray angle to the air pattern of the
burner. In today’s flame retention burner, it is possible to fire more
than one spray angle with good results. Generally, round or square
combustion chambers should be fired with 70° to 90° nozzles.
Long, narrow chambers usually require 30° to 60° spray angles.
Spray Pattern
Spray pattern is another consideration in determining which
nozzle to use. There’s a great difference between the solid pattern
on the left and the hollow pattern on the right. (See Fig. 10) These
patterns were photographed as a laser light beam passed through
the spray. Lasers are used at the Delavan test laboratory to study
patterns and spray characteristics.
Figure 10 (Left) Solid cone pattern, (Right) Hollow cone pattern
70° to 90° spray angles for round or square chambers
30° to 60° spray angles for long, narrow chambers
Figure 9
Figure 8
Spray angles
available
90° 80° 70° 60° 45° 30°