New Technology in Oil Content Monitors
Abstract
With legislation of international antipollution requirements to regulate the oil content of bilge effluent from ships, the U.S. Navy is installing pollution abatement equipment on all vessels. The equipment will consist of an oil/water separator in the bilge discharge line, followed by an oil content monitor which makes the final decision on whether or not the water is clean enough to be pumped overboard. The monitor is required to make a real time measurement of oil concentration in the range 15 + or - 5 to 100 + or - 20 ppm for flow rates up to 50 gal/min. and possibly in the presence of interfering contaminants, such as rust. This paper presents results of the current effort to develop a monitor which satisfies all these requirements and is sufficiently rugged for fleet deployment. The monitor employs two fiber optic systems and a small microprocessor. The first optical system measures the concentration of particles in the flow as function of their sizes, using small angle forward scattering. The second determines what percentage of the particles in the flow are oil, using large angle scattering. The microprocessor takes these data and calculates the oil concentration in the flow.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1987
- Accession Number
- ADA183941
Entities
People
- Grant H. Stokes
- John A. Nardella
- Timothy T. Raw