Balanced Pressure Proportioner System.
Abstract
Water motor proportioners have been used in the Fleet since 1947 as part of the shipboard fire protection system. These proportioners, which were originally designed to deliver protein foam concentrate, have been a source of many problems since the introduction of the less viscous Aqueous Film Forming Foam (AFFF) concentrate in 1968. The relaxation of the requirement that foam proportioners be water powered has made possible the development of more reliable systems, such as the balanced pressure proportioner, which employs an electrically driven pump. The proportioner employs two ratio controllers: Type II to cover the range of 50 to 5000 gpm and Type III for 50 to 1000 gpm. The system has been tested in the laboratory over the flow rate range of 50-1000 gpm at firemain pressures of 100-200 psi and found to meet the requirements of the specification for concentration of AFFF and for pressure drop with one exception, namely, the pressure drop for the Type II exceeded the limited at 500 gpm. It was recommended that the specification be modified to allow for this excessive pressure drop. Keywords: Firefighting systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 12, 1986
- Accession Number
- ADA168968
Entities
People
- C. L. Whitehurst
- R. E. Burns
- R. L. Gipe
- Susan Cater
Organizations
- United States Naval Research Laboratory