FED-STD-791D
Method 1151.2
September 30, 1986
EXPLOSIVE VAPORS IN BOILER FUEL OIL
1. SCOPE
1.1 This method is used for determining the approximate percent explosiveness of gas
and vapor mixture given off by fuel oil.
2. SUMMARY
2.1 The test consists of measuring the explosiveness of fuel-oil vapors produced under
specified conditions, using a hot-wire type combustible-gas indicator that has been calibrated
against a hydrocarbon gas of known explosiveness.
3. SAMPLE SIZE
3.1 Approximately 1 L (1 qt) of oil representative of the lot to be tested.
CAUTION:
The one sample is to have been immediately stoppered (allowing a minimum
of air space) upon removal from the lot.
4. REFERENCES, STANDARDS, AND APPARATUS
4.l Indicator, combustible-gas, hot-wire (Explosimeter Model No. 2, Mine Safety
Appliances Co., Pittsburgh, Pa., or equivalent).
4.2 Flask, volumetric, 2 L, with 2-hole rubber stopper.
4.3 Graduated cylinder, 100 mL.
4.4 Tank, water (deep enough to accommodate 2-L volumetric flask and 100-mL
graduated cylinder.).
4.5 Tube, drying, containing anhydrous calcium chloride.
4.6 Bulb, aspirator.
4.7 Vapor generating apparatus (Figure 1), consisting of:
a.
Bottles (2), glass, 1 qt, wide mouth.
b.
Stopper, rubber, 2-hole (for 1-qt bottle).
c.
Stopper, rubber, 3-hole (for 1-qt bottle).
Thermometer, 40 to 82C (100 to 180F) (ASTM El).
d.
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