O-A-445C
b. Each tank car.
c. Bulk storage tank. When specified (see 6.2), bulk liquid ammonia used exclusively for filling an entire order of small cylinders may be sampled and tested prior to the actual transfer.
4.3.3 Examination. All cylinders shall be examined as specified in 4.4.1. Presence of any defect shall be cause for rejection.
4.3.4 Tests. Samples selected in accordance with 4.3.2 shall be tested as specified in 4.4.
4.3.5 Inspection procedure.
4.3.5.1 Examination. The filled ammonia cylinders shall be examined as specified herein for the following defects:
101 Cylinder and valve not as specified.
102 Cylinder not processed and dried as specified.
103 Painting, color coding, and marking not as
104 Capaicfiityd at 70 °F (21 °C) not as specified.
105 Container or valve leakage.
4.4. Test methods.
4.4.1 Sampling.
a. The flasks, tubes, and assemblies shall be cleaned with chlorinated solvent and dried. Boiling chips of known volume shall be placed in the sample containers and the following samples shall be taken from each inspection lot. For moisture residual and purity tests, use standard ASTM 100 milliliter (ml) centrifuge tubes calibrated in 0.05 ml increments to 1.0 ml. Prepare an adapter from a 1/2-inch Pyrex tube with a 1/4-inch lateral vent. Fit one end to receive the sampling hose and fit the other end with a one-hole stopper that will mate with the mouth of the centrifuge tube for a snug fit. Assemble the adapter, hose, and centrifuge tube into a unit and provide a vented stopper for each flask to be used. If possible, chill this equipment before taking samples.
b. Attach the hose of the 100 ml tube assembly to the container of ammonia to be tested, and as quickly and accurately as possible draw 100 ml into the centrifuge tube with the container shut-off valve. With the apparatus intact, allow the ammonia to evaporate to less than 0.5 ml. Repeat this sampling procedure four more times for a total sample size of 500 ml. With the final residue in the centrifuge tube and with the assembly intact, loosen the hose from the adapter and allow the ammonia to continue to evaporate at room temperature.
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