TEST OF GERMAN SAND-TYPE FILTER
Abstract
Presented is a sand filter evaluated with respect to ventilation characteristics and effectiveness in protecting a shelter from the hot blast of a nuclear explosion. Tests indicated an airflow of 4 cfm per square foot of filter area for a 36-in. depth of sand, 6 cfm for a 24-inch depth, and 12 cfm for a 12-in. depth when the pressure drop is 1-in. water-gaged. Special equipment was built to release compressed air to simulate the blast from a nuclear explosion. A model shelter consisting of steel tank was connected to the air-blast device through an 8-in.-diameter sand filter. The filter proved to be reasonably effective in attentating blast when subjected to overpressures up to 100 psi with a positive time duration of about 2 seconds. However, the effectiveness varied with changes in the size of sand grains even though the changes were within the filter specifications. The heatabsorbing characteristics of the sand were studied under conditions similar to a nuclear blast, by subjecting the filter to blasts of hot pressurized air. Heat-absorption characteristics were also studied, in 24-hour tests simulating night and day, when ventilating air of varying temperatures was passed through the filter. The sand proved to be an excellent heat absorber, maintaining the outlet temperature at an acceptable level.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 11, 1963
- Accession Number
- AD0424552
Entities
People
- J. M. Stephenson
Organizations
- Naval Facilities Engineering Service Center