• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
CBR  PROTECTIVE  EQUIPMENT
FITTING  AND  TESTING  THE  ND  MK  V MASK

Military Requirements for Petty Officer 2nd Class - index
Page Navigation
  76    77    78    79    80  81  82    83    84    85    86  
Figure 6-2.-The ND Mk V sensory effects, such as a continuous flow of tears, might indicate that replacement is needed. Two types of protective masks have been in general use in the Navy: the M17A1, issued to shore-based personnel, and the ND Mark (Mk) V, issued to forces afloat. Both of these, however, are  being  phased  out  and  replaced  by  the MCU-2/P mask. All masks consist of a facepiece and filter system. The facepiece provides a gastight seal around the face, protecting the eyes, lungs, and facial skin. The filter system is attached to the facepiece; it filters out or absorbs airborne radioactive material and BW/CW agents before air enters the facepiece for inhalation. The main purpose of the mask is to purify the air being breathed by its wearer. To effectively purify the air, the mask must meet two requirements. First, the facepiece must fit snugly over the face to provide a perfect seal. Second, the filter system must prevent any contaminated material or chemical agent from entering the mask. ND Mk V Protective Mask A unique design feature of the ND Mk V protective mask makes it ideally suited for shipboard use. A pneumatic cushion located around the underside edge of the facepiece allows the facepiece to conform to the wearer’s face; therefore, an airtight seal is possible for virtually all facial shapes. This feature permits the issue protective mask. of the mask in only one size and, thus, eliminates the need for stowing and issuing various sizes of protective masks aboard ship. The major components of the ND Mk V pro- tective mask are shown in figure 6-2. The mask facepiece  is  made  of  a  black,  flexible  rubber compound formulated to retard the penetration of chemical agents. The wide-vision eyepiece is a clear, flexible, one-piece plastic lens curved to the shape of the facepiece. Voice transmission is permitted by a thin plastic membrane in the diaphragm  assembly.  Other  features  of  the facepiece include the air-inlet and exhaust valves and the canister holders. Air deflectors, located inside the mask, create a flow of air from the air-inlet valves across the eyepiece to reduce fogging. Filtration for the mask is provided by filter canisters mounted on the two canister holders on the facepiece. Each of these filter canisters contains a treated paper filter and an activated charcoal filter. The treated paper filter removes particulate matter, and the activated charcoal filter absorbs toxic vapors and aerosols from the inhaled air. A rubber apron affixed to each canister attaches the canister to the holder on the facepiece. The rubber apron provides an airtight seal around this connection when it is rolled over the back of the canister holder. 6-10







Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.