SHIPBOARD DAMAGE CONTROL, PERSONNEL PROTECTION, FIREFIGHTING AND CBR-D
 MUSEUM WEBSITE
 
DAMAGE CONTROL MUSEUM
DC EQUIPMENT Museum
 
Gas Free Equipment
Flame Safety Lamp
 
The flame safety lamp was used for many years, from before WWII until the 1970s. While it could detect the presence of flammable gases, it was intended solely to test an atmosphere for oxygen deficiency, to ensure that sufficient oxygen was present to support life. The lamp was constructed of non-sparking brass and had a glass globe and cotton wick. The lamp used naphtha as its fuel. Explosions did occur because of defective parts, incorrect procedure, or improper assembly of the lamp. When testing with the flame safety lamp, it had to be moved carefully and slowly while holding it as close to vertical as possible. The following indications of flame behavior were a result of conditions in the atmosphere being tested; these indications had to be assessed by the test observer: Flame dies out: insufficient oxygen (less than 16% by volume) Flame dies out with a slight “pop”: explosive concentration of gases or vapors Flame flares up brightly: less explosive concentration of gases or vapors Flame flares up, then goes out: rich concentration of explosive gases or vapors The test observer had to ensure that the flame safety lamp flame burned for five minutes, with the flame adjusted to 3/8 inch, for proper warm up before it was allowed to be taken into a space. It had to remain under constant observation while testing, and it had to be kept still for several seconds in each location. When entering a tank, void or compartment with the flame safety lamp, the test observer had to wear an OBA or hose air-line mask.
Image of Flame Safety Lamp
 
For more information, see the Index.