MIL-PRF-26539F
4.2.2.1.2. Cylinders, portable tanks, cargo tanks, tank cars and other containers. A sample shall
be taken from each individual shipping container.
4.2.2.1.3 Method of taking sample. Samples taken from the shipping container shall be
representative of the entire contents of the container. The container's dip tube must be completely
purged of product prior to taking the sample (approximately 2.0 liters).
4.2.3 Rejection. When any sample of the propellant tested in accordance with 4.3 fails to
conform to the requirements specified herein, the entire contents of the shipping container represented by
the sample shall be rejected.
4.3 Test methods.
4.3.1 Examination of product. The sample (4.2.2.1.2) shall be examined with transmitted light to
satisfy the qualitative requirements. Place 100 mL of sample in a clean, clear glass container (graduated
cylinder or large test tube), cool in an ice-bath for 10 minutes, wipe dry, and examine visually by
transmitted light from a light bulb or sunlight. The presence of visible sediment in the sample shall be
cause for rejection.
4.3.2 Nitric oxide (NO) content. The NO content of MON type samples shall be determined by
the procedure specified in 4.3.2.1 or by the alternate procedure described in 4.3.2.2. In the event of
dispute, the procedure specified in 4.3.2.1 shall be used as the referee method.
4.3.2.1 Nitric oxide assay. The NO content of the sample shall be determined by the following
method.
4.3.2.1.1 Tared sample. Evacuate and weigh to the nearest 0.001 gram (g) a sample bomb of
approximately 60 mL capacity, fitted with a needle valve. Support the sampler in a vertical position on a
ring stand in a hood. Connect the sample bomb to the sampler and provide for evacuating the connecting
line. Evacuate the connecting line, then, open the sample bomb and sampler valves. Transfer 40 to 60 g
of the sample. Close all valves and then evacuate the connecting line. Disconnect the sample bomb and
flush the exposed opening of the valve with nitrogen gas conforming to MIL-PRF-27401, until residual
N2O4 disappears. Accurately reweigh the sample bomb to the nearest 0.001 g, obtaining the sample
weight by difference. If sample weight is below 40 g, another sample shall be taken.
4.3.2.1.2 Procedure. Attach a rotameter with stainless steel tubing to the reducing valve of a
cylinder of oxygen (O2) gas conforming to MIL-PRF-25508. Connect a length of 1/16 inch stainless steel
tubing to the exit end of the rotameter. Open the cylinder valve and purge residual air from the
connecting lines and rotameter. Immediately attach the sample bomb to the other end of the 1/16 inch
tubing and, using the reducing valve, adjust the oxygen pressure to 30 pounds per square inch (psi).
Close the cylinder valve. Place the sample bomb in an ice bath and maintain the temperature at
approximately 32°F (0°C). After the sample has been allowed to cool for 10 minutes, permit O2 to flow
into the sample bomb by first opening the cylinder valve and then the bomb valve. Occasionally shake
the bomb to hasten absorption and oxidation. Lack of O2 flow through the rotameter indicates completion
of reaction. Allow the sample bomb to remain in the ice bath for 15 minutes, with valves open after
reaction has been completed. Disconnect the sample bomb, remove from the bath, warm to ambient
temperature and wipe dry. Place on a balance and record the weight to the nearest 0.001 g.
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