Safety approved shields

Equations 30 and 31 apply to any vented panel configuration which has been tested (e.g., all safety approved shields) and to uniformly vented structures, i.e., structures vented in the same manner through all sides and the roof. 

Methods for modifying suppressive shields to meet specific production line requirements are given in Chapter II - Safety Approved Shields. 

Department of Defense Explosives Safety Board has approved five groups of suppressive shields for protection of munitions production operations in US Army Ammunition Plants. Safety approved shields encompass seven different designs which range in size from a two foot diameter steel shell (Shield Group 6) to a ten foot diameter steel cylinder (Shield Group 3). 

Details on safety approved shields will be presented with technology study results. 

To determine limits on flame suppression capability of this shield, thermal suppression studies have been conducted beyond those required for the safety approval proof tests mentioned previously ( ). 

Single base, multiperforated, MIO gun propellant in bulk was used in the propellant tests. The illuminant material was a 50 50 mix of sodium nitrate and powdered magnesium. The safety approval tests were conducted with a smaller charge weight than that shown, 50 pounds of the illuminant mix. To be complete, the proof test charge of 2.5 pounds is shown. That charge weight stressed the shield structure to its limit and was not increased. 

Caution. Hydrofluoric acid causes severe bums and all appropriate safety literature describing precautions should be consulted before use. Lab coat, face-shield, and heavy vinyl gloves should be worn when preparing, stirring, and transferring aqueous HF solutions. The fume hood should be approved for use with hydrofluoric acid. The high-temperature oven should also be placed in the hood since aluminum fluoride and HF are evolved in the heat treatment. 

To Insure that Department of Defense safety offices approve site plans which incorporate suppressive shields, we have designed, fabricated, and proof tested several designs as listed in Table V. 

The characteristics of the shields approved by the Department of Defense Explosives Safety Board are summarized in this table. They include sizes and charge weights typical to munitions manufacturing, but they can be scaled up or down in size or charge weight to meet special laboratory requirements. 

Antimony Trichloride Bu. Mines approved respirator, face shield, leather or rubber safety shoes, rubber apron, rubber gloves, safety goggles. Move to fresh air. Keep patient warm but not hot and get medical attention immediately. Flush thoroughly with water. Remove all contaminated clothing and wash effected area with soap and water. ... 

Oleum Respirator approved by U.S. Bureau of Mines for acid mists, rubber gloves, splash proof goggles, eyewash fountain and safety shower, rubber footwear, face shield. Rush with plenty of water. Flush with water for at least 15 minutes. 

U.S. Bu. Mines approved respirator, rubber gloves, safety goggles with side shields or chemical goggles, coveralls or approved rubber apron, sleeves. 

Sulfuric Acid Safety shower, eyewash fountain, safety goggles, face shield, approved respirator, rubber safety shoes, rubber apron. Observe victim for delayed pulmonary reaction. Wash with large amounts of water. Wash with large amounts of water. Do not use oils or ointments. 

---