Dive_Man_ChangeA

4-4 U.S. Navy Diving Manual—Volume 1 ! System: (Name or description, consistent with drawings) ! Step, Component, Description, Procedure, Location, Check, Note (read in seven columns) 4-2.6.5 Example. ! System: High Pressure Air ! Step/Component/Description/Procedure/Location /Initials /Note 1. ALP-15/Reducer outlet/Open/Salvage Hold/Initials/Note 2. ALP-GA-7/Reducer outlet/Record Pressure/Salvage Hold/Initials/Note 1 The operator executing the procedure shall initial the Check column. Hazards and items of particular concern shall be identified in the Note column. Once NAVSEA or NAVFAC has approved the system OP/EPs, they shall not be changed without specific written approval from NAVSEA or NAVFAC. 4-3 DIVER’S BREATHING GAS PURITY STANDARDS 4-3.1 Diver’s Breathing Air. Diver’s air compressed from ANU or certified diving system sources shall meet the U.S. Military Diver’s Breathing Air Standards contained in Table 4-1. Diver’s breathing air may be procured from commercial sources if a source of military diver’s air is not readily available. Diver’s air procured from commercial sources shall be certified in writing by the vendor as meeting the purity standards of FED SPEC BB-A-1034 Grade A Source I (pressurized container) or Source II (compressor) air. Specifications for this standard are outlined in Table 4-2. 4-3.2 Diver’s Breathing Oxygen. Oxygen used for breathing at 100-percent concentra- tions and for mixing of diver’s breathing gases shall meet Military Specification Table 4-1. U.S. Military Diver’s Compressed Air Breathing Purity Requirements for ANU Approved or Certified Sources. Constituent Specification Oxygen (percent by volume) 20-22% Carbon dioxide (by volume) 1,000 ppm (max) Carbon monoxide (by volume) 20 ppm (max) Total hydrocarbons (as CH₄ by volume) 25 ppm (max) Odor and taste Not objectionable Oil, mist, particulates 5 mg/m3 (max)