Donning Procedures (Cont)

TM 5-4220-225-14 Table 2-4. Donning Procedures (Cont). Step Procedure d. front helmet jocking strap is adjusted by the diver to his preference. e. With the diver fully dressed, perform a communication check and establish desired air flow. Gloves are task dependent. 9. AIR NECKDAM DONNING Air Neckdam Configuration. a. This configuration has no garment requirements other than the diver's preference. An undershirt is recommended which serves to minimize chafing by the harness. The system can be used with swim fins, wetsuit, weight belt or outer garment, and any combination of the above. b. The harness is donned in the same manner as for thedrysuit configuration. A lower breech ring with neckdam is placed over the head and secured to the jocking straps with the lower edge of the neckdam pointed upward around the neck. c. The helmet is put in place and secured in the same fashion as for the drysuit configuration. Gloves are task dependent. 2-13. In-Water Operations. Diving operations will be conducted at the work site according to the guidelines of the plan, and as directed by the diving supervisor. Diver air flow information is supplied in the following paragraphs. 2-14. Air Flow Indication . In the air configuration(open circuit), the amount of ventilation the diver is receiving is indicated by the MK12 flowmeter at the diving station. Since the flowmeter is calibrated in inches of water (inches of H20) and ventilation is determined in actual cubic feet per minute (ACFM), a conversion is required. Figure 2-9 shows the flow in ACFM at depth for specific flowmeter readings. To determine divers air flow, find diver's depth across the bottom of the graph. Determine the flowmeter gage reading and locate at the left of the graph. The diver ventilation is determined by locating these coordinates and interpolating between the curves. 2-39