Diving should not be done by untrained personnel unless under the supervision of a diving officer or trained divers designated by the diving officer, and the depth of dive should not exceed 36 feet. Make sure the air-control valve of the diver’s oxygen pump is connected to a standard 7/16-inch oxygen hose fitting. Several activities have reported very positive results as a result of the converted masks. The Bureau suggests that you convert using the following method. Service gas masks ND-MkIII or ND-V are appropriate for scuba diving. The trailing hose is vulnerable to burning if there is an intervening flame or if there is an obstruction or wreck in the path of the trailing hose. Longer lengths may be used if the pump has a longer capacity. A hose can be used without a pump or compressed air bank in addition to a maximum length of 25′ and a minimum inside diameter of 1″. When fully charged with compressed air, a one-minute charge can be completed in just one and a half hours. According to the findings of the tests, a standard 200 mL container holds 200 mL of water. A compressed air supply should be used in place of a pressurized air supply. ND Mark III and Mark IV gas masks are equipped with wire bails that suspend the canisters and allow them to remain in place. Drill a hole large enough to hold an air hose or a 5/16 inch inside diameter piece of tubing.Īpply several coats of cement over the entire manifold and then tape it together with rubber tape. Drill two 14 holes, one near each end, to ensure that air does not escape. Air manifolds made by DIY Air Manifolders use one low-pressure seamless brass tube. The gas mask facepiece and air hose mask are the most commonly used, and they typically have a gas mask facepiece with an air hose extension and an air hose head harness. ( 688), EN28/A2-11, 22 April 1944, All military units and commandants must perform their functions in the same manner. This is an official publication of the Navy Department. Each of these masks has a different purpose, and the Navy will choose the best mask for the job depending on the mission requirements. The M45 mask is the least protective of the three, but it provides the best visibility. The M40 mask provides good protection and better visibility, but it is not as protective as the M50. The full face M50 mask is the most protective of the three, but it also has the poorest visibility. Each of these masks has different benefits and drawbacks depending on the situation. Some of the most common masks include the full face M50 mask, the M40 mask, and the M45 mask. The United States Navy uses a variety of different gas masks depending on the specific mission requirements.
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