FED-STD-791D
Method 6052.1
September 30, 1986
HIGH-TEMPERATURE--HIGH-PRESSURE SPRAY IGNITION
1. SCOPE
1.1 This method is used for determining the relative flammability of liquids.
2. SUMMARY
2.1 The method consists of forcing the test fluid sample through a 0.0368-cm
(0.0145-in) orifice at 6.98 MPa gage (1000 psig), attempting to ignite the spray with a
torch and noting the characteristics of the resulting flame.
3. SAMPLE SIZE
3.1 Sufficient liquid to be tested to fill cylinder of spray test setup.
4. REFERENCES, STANDARDS AND APPARATUS
4.1 Apparatus.
4.1.1 Spray test setup. A setup similar to Figure 1 shall be assembled so as to
supply a constant pressure of 6984 " 69 kPa gage (1000 " 10 psig) to the sample.
4.1.2 Torch. An oxyacetylene torch equipped with a No. 3 tip or equal.
4.1.3 Nozzle. A nozzle 0.163-cm (0.064-in) thick by 0.965-cm (0.38-in)
minimum diameter with a centered orifice approximately 0.0368-cm (0.0145-in) diameter
having sharp, square edges (see Figure 1).
5. MATERIALS
5.1 CAUTION: SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
chemical materials listed in this section must be handled carefully. Federal Test Method
10000, Material Handling Safety Precautions, is a reference which lists all toxic and
hazardous materials cited in FTMS 791. The synonyms, life hazard, flammability,
handling and storage precautions, emergency treatment and measures, and spill practices
of each chemical are explained.
5.2 Nitrogen. A cylinder of nitrogen fitted with a regulator capable of supplying
6890 kPa gage (1000 " 10 psig) of pressure to the system.
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