PALLETIZED UNIT LOAD SPRAY FACILITY, DESIGN AND TEST.
ARMY NATICK LABS MASS
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A palletized unit load spray facility was designed to provide approximately the equivalent exposure as prescribed for small boxes by ASTM D-951-51, except that clear area dimensions were expanded to accommodate specimens up to and including pallet size unit loads. Various sizes and types of nozzles were investigated to establish optimum spray pattern coverage and flow characteristics. Final design gave a clear space of approximately 10ft. x 9ft. 4in. x 8ft. high with sufficient maneuver room to bring in specimens up to and including full palletized unit loads and CONEX inserts. The completed unit was calibrated for flow versus pressure using a variable built-in line pressure regulator and flow meter to approximate the ASTM requirement for 2 to 2-12 gallons hoursquare foot, which is approximately 4-13 inches per hour or a steady tropical rain, with the added provision for horizontal spray to simulate wind-blown rain. In view of the spray strike pattern and surface wetting characteristics obtained, the design is considered a successful compromise of all the factors and limitations involved for the purpose intended. Author