Biodeterioration of Membrane Separators for Use in an Oil Pollution Prevention System.
NAVAL RESEARCH LAB WASHINGTON D C
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Prototype membrane materials for possible use as separators of ballast water and oil in cargo tanks of oilers and tanker ships in a membrane oil pollution prevention system, MOPPS have been evaluated for their resistance to microbial deterioration. Fabric reinforced elastomer composites of two types were tested neoprenenylon fabricnitrile and Hydrinnylon fabricHydrin. Samples with cold and hot-formed seams were also tested. Following exposure in systems inoculated with microorganisms commonly associated with fuels for periods up to one year, membrane specimens were inspected visually and by light and electron microscopy and also subjected to standard physical tests. The changes observed appeared to be due to oil and water exposure rather than to microbial deterioration. Although the neoprenenylonnitrile membrane appeared a promising choice for further performance evaluations, it is essential that pinholes and open cut edges at seams be minimized if extensive diffusion of water and oil into the fabric and the accompanying weakening of the fabric-elastomer bond are to be avoided. Numerous microscopic cracks were noted in the exposed Hydrin surfaces indicating that the formulation of this rubber should be reevaluated if it is to be retained as a possible backup membrane candidate. Author
- Elastomers and Rubber
- Civil Engineering
- Marine Engineering