OTTO FUEL II

OTTO FUEL II

Otto Fuel II is the propellant for the propulsion system of the Mk 46 (all Mods) torpedo. Otto Fuel II is first sprayed under pressure into a combustion chamber where it is ignited. The exhaust gases from the burning fuel are used to drive the torpedo engine. The major advantage of this system is the short turnaround time required for exercise weapons.

Otto Fuel II is a stable, liquid monopropellant composed of a nitrate ester in solution with a desensitizing agent and a stabilizer. It is a bright red, free-flowing, oily liquid that is heavier than water.

(NOTE: When in a thin layer, such as a spill, stain, or leak, Otto Fuel II is a yellow-orange color.)

Otto Fuel II is noncorrosive. It has an extremely low vapor pressure, minimizing explosive and toxic hazards. Otto Fuel II can detonate, but the conditions and stimulus required are so extreme that it is considered a nonexplosive. The propellant has a high flash point and other safety characteristics. It is classified as a low fire hazard material.

The ingredient of medical concern in Otto Fuel II is the nitrated ester. Nitrated esters are known for their acute effects on the human body. Symptoms of exposure to Otto Fuel II include the following:

• Headache

• Dizziness

• Drop in blood pressure

• Nasal congestion

NOTE: Depending upon the sensitivity of the individual, a temporary symptom-free tolerance may develop during the remainder of the working period. After exposure to a vapor-free environment, the first contact with Otto Fuel II vapors often causes these symptoms to recur.

A stowage space is specifically designated for each type of torpedo stowed aboard a combat ship. When handling Otto Fuel II, at least two crewmembers should handle the fuel. All personnel must know the general characteristics of Otto Fuel II, the safety precautions for handling the fuel, and protective equipment required. To avoid hazardous situations when handling Otto Fuel II, personnel should be well trained and supervised. For further information concerning Otto Fuel II, you should refer to Otto Fuel II Safety, Storage, and Handling Instructions, NAVSEA S6340-AA-MMA-010.