MIL-STD-1411B
argon, nitrogen, helium, oxygen, carbon dioxide, and their mixtures. It can only be used for cylinders in flammable gas service if the flammable gas is carefully purged out and replaced with an odor-free inert gas or dry air before the inspection is performed. It is normally not performed on cylinders from which the valve is to be removed.
CAUTION: Do not place the nose directly into the venting gas stream and do not take deep breaths. Discontinue sniffing any gas at the first indication of irritation of the nasal passages or at any sign of physical discomfort. Some contaminants are extremely irritating, poisonous, or toxic and can cause physical injury.
5.2.7.2.1 Odor test procedure. The following procedure for performing the odor test is recommended for use not only when cylinders are changed in service but also before each refill of the cylinders. Standing at arm's length from the cylinder to be tested and with the valve pointing to the left (to the right for left-handed individuals), crack the valve for the briefest possible moment and immediately reclose it. The valve must point away from the hand and arm used to operate the valve. Sniff cautiously without approaching the cylinder. If no odor is detected, slowly open the valve until a gas flow is heard or felt (pass the hand rapidly past the outlet) and proceed to the next step. Be prepared at all times to close the valve quickly. With the valve open to a slight flow of gas, place a cupped hand in the gas stream, close the cylinder valve, and cautiously sniff the cupped hand. If no foreign odor is detected, proceed to the next
step. Reopen the valve to a slight flow and, with a quick fanning motion of the hand, fan the gas from the cylinder toward the nose. If no order is detected, continue the fanning motion and
move progressively nearer the cylinder.
5.2.7.2.2 Classification of odor. If at any time during the inspection process an odor is detected, an attempt should be made to classify it using terms such as "acrid", "sweet", "rotten egg", "glue-like", or similarly descriptive terms, as this will help in the selection of the appropriate cleaning process.
5.2.7.2.3 Odor detection personnel. The ability to detect and classify odors is important in the detection and identification of contaminants. Persons assigned this task must be able to detect foreign odors in gases vented from cylinders. Such persons should be questioned as to their ability to detect odors. The ability to pick out a cylinder with a known contaminant, from a group of contaminated cylinders, shall be demonstrated by test. Persons temporarily unable to detect or classify odors because of head colds, hay fever, or similar conditions, shall be excluded from the assignment of inspecting cylinders for the presence of odorous contaminants.
5.2.8 Sulfur hexafluoride cylinder internal inspection. Each cylinder in sulfur hexafluoride service shall be bled to zero pressure (0 psig) in accordance with environmental requirements, devalved (see 5.3.2.1), and subjected to internal inspection by droplight (see
5.3.2.2). Internally, sulfur hexafluoride cylinders shall be free of oil, grease, and rust to the reduced metal level and shall be equivalent to the rust free examples in ASTM D2200. Cylinders requiring internal cleaning shall be scheduled for maintenance procedures in accordance with section 5.3.5, (c) and (d).
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