List of Abbreviations

TM 5-4220-225-14 Deficiency Report). Mail it to us at: Commander, U.S. Army Troop Support Command, ATTN: AMSTR-MOF, 4300 Goodfellow Boulevard, St. Louis, Missouri 63120-1798. We will send you a reply. 1-6. List of Abbreviations. ac Alternating current ACFM Actual cubic feet per minute of gas flow CCN Closed cell neoprene CO₂ Carbon dioxide dBA Noise level standard (scale A) dc Direct current FSW Feet of seawater Hg Mercury H.P. High Pressure Hz Hertz; unit of electrical frequency (cycles per second) H₂O Water (fresh) I.D. Inside diameter Kg Kilogram Kn Knot lb Pound LPM Liters per minute, flow Nm Newton meter NWDL Normal working diving limit O.B. Overbottom O₂ Oxygen P Pressure differential psi Pounds per square inch psia Pounds per square inch, absolute psid Pounds per square inch, differential psig Pounds per square inch, gage RTV Room Temperature vulcanizing sealant SCUBA Self Contained Underwater Breathing Apparatus SEV Surface equivalent volume SSDS Surface Supported Diving System U/W Underwater VAC Vacuum Vac Volt, alternating current Vdc Volt, direct current °C Degrees Celsius °F Degrees Fahrenheit 1-2