424 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 25, App. F 

(4) 

Pilot Burner. 

The pilot burner used to 

ignite the specimen must be a 
Bernzomatic

TM

commercial propane venturi 

torch with an axially symmetric burner tip 
and a propane supply tube with an orifice di-
ameter of 0.006 inches (0.15 mm). The length 
of the burner tube must be 2

7

⁄

8

inches (71 

mm). The propane flow must be adjusted via 
gas pressure through an in-line regulator to 
produce a blue inner cone length of 

3

⁄

4

inch 

(19 mm). A 

3

⁄

4

inch (19 mm) guide (such as a 

thin strip of metal) may be soldered to the 
top of the burner to aid in setting the flame 
height. The overall flame length must be ap-
proximately 5 inches long (127 mm). Provide 
a way to move the burner out of the ignition 
position so that the flame is horizontal and 
at least 2 inches (50 mm) above the specimen 
plane. See figure 6. 

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spaschal on DSK3GDR082PROD with CFR