CHART TRIFECTA 2K, Руководство по обслуживанию

Страница: 9 / 33

Trifecta 2K
It is important to locate an oxygen system in a well-ventilated location since oxygen-rich
atmospheres may collect temporarily in confined areas during the functioning of a safety relief
device or leakage from the system.
Oxygen system components, including but not limited to, containers, valves, valve seats,
lubricants, fittings, gaskets and interconnecting equipment including hoses, shall have adequate
compatibility with oxygen under the conditions of temperature and pressure to which the
components may be exposed in the containment and use of oxygen. Easily ignitable materials
shall be avoided unless they are parts of equipment or systems that are approved, listed, or
proved suitable by tests or by past experience.
Compatibility involves both combustibility and ease of ignition. Materials that burn in air
may burn violently in pure oxygen at normal pressure, and explosively in pressurized oxygen.
In addition, many materials that do not burn in air may do so in pure oxygen, particularly when
under pressure. Metals for containers and piping must be carefully selected, depending on
service conditions. The various steels are acceptable for many applications, but some service
conditions may call for other materials (usually copper or its alloys) because of their greater
resistance to ignition and lower rate of combustion.
Similarly, materials that can be ignited in air have lower ignition energies in oxygen. Many
such materials may be ignited by friction at a valve seat or stem packing, or by adiabatic
compression produced when oxygen at high pressure is rapidly introduced into a system
initially at low pressure.
NITROGEN AND ARGON
Nitrogen and argon (inert gases) are simple asphyxiants. Neither gas will support or sustain
life and can produce immediate hazardous conditions through the displacement of oxygen.
Under high pressure these gases may produce narcosis even though an adequate oxygen supply,
sufficient for life, is present.
Nitrogen and argon vapors in air dilute the concentration of oxygen necessary to support or
sustain life. Inhalation of high concentrations of these gases can cause anoxia, resulting in
dizziness, nausea, vomiting, or unconsciousness and possibly death. Individuals should be
prohibited from entering areas where the oxygen content is below 19% unless equipped with a
self-contained breathing apparatus. Unconsciousness and death may occur with virtually no
warning if the oxygen concentration is below approximately 8%. Contact with cold nitrogen or
argon gas or liquid can cause cryogenic (extreme low temperature) burns and freeze body tissue.
Persons suffering from lack of oxygen should be immediately moved to areas with normal
atmospheres. SELF CONTAINED BREATHING APPARATUS MAY BE REQUIRED TO
PREVENT ASPHYXIATION OF RESCUE WORKERS. Assisted respiration and supplemental
oxygen should be given if the victim is not breathing. If cryogenic liquid or cold boil-off gas
contacts a worker’s skin or eyes, the affected tissues should be promptly flooded or soaked with
tepid water (105-115
o
F; 41-46
o
C). DO NOT USE HOT WATER. Cryogenic burns, which result
in blistering or deeper tissue freezing, should be examined promptly by a physician.
5