By Safety Panel British Cryogenics Council Safety Panel British Cryogenics Council
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Additional info for Cryogenics Safety Manual. A Guide to Good Practice
Caustic cleaning. Strong alkaline solutions are used to remove heavy or tenacious surface contaminants. Such solutions are generally more effective when warm, and may be applied by spraying, immersion or flushing. Acid cleaning This method may be used to remove oxides and other contaminants by immersion or flushing with a suitable acid solution, usually at room temperature. Commonly used acids are phosphoric acid or hydrochloric acid. The former is used on most metals for removal of oxides, light rust, and fluxes, whereas the latter is used primarily on carbon and low alloy steels for removal of rust, scale, and oxide coatings.
2 Selection of materials for oxygen service Only materials which have been properly tested and approved may be used in service with oxygen. Information regarding the selection of such materials should be obtained either from the industrial gas suppliers or published data. The behaviour of several common substances in contact with gaseous or liquid oxygen is summarized below. The list is not exhaustive, but serves as an indication of the types of materials which may be safely used in oxygen service and those which are not acceptable for use.
The contaminants of greatest concern are those which are flammable, such as hydrocarbons, and which can pass through to the oxygen-rich sections of the process system. Acetylene is of particular concern, because of its relatively low solubility and high reactivity in liquid oxygen. Although air separation plants normally incorporate equipment for removal of hydrocarbon contaminants from the gas and liquid streams, the design of which is based on measured or estimated pollution levels, it is advisable to be aware of local sources of contamination which may on occasions give rise to peak levels and jeopardize the safety of the plant.
Cryogenics Safety Manual. A Guide to Good Practice by Safety Panel British Cryogenics Council Safety Panel British Cryogenics Council