TM   5-4220-231-14&P Table 2-1. Operator Preventive Maintenance Checks and Services For   Diving    Operations -  (Con't). B-Before D-During A-After W-Weekly ITEM INTERVAL ITEM   TO   BE   INSPECTED. Equipment is NO Not   Ready/ B D A W PROCEDURE Available If: 18 0 0 Flasks, HP   (Con't) Con't Delamination A  whitish patch like   a blister or airspace is present. Fire   Damage Fire   damage is   evident by charring or burning of   the composite labels, paint, or   plastic components of   the    valves. WARNING Before testing flask valves, ensure all  personnel are    clear of   area to   avoid possible injury   from flying    debris. DO   NOT    OPEN VALVE    IF  ANY DAMAGE IS   DETECTED. Before opening valves, ensure protective caps have been removed from hose couplings. When inspecting valve    control, DO   NOT    OPEN VALVE FULLY. Failure to comply could result in  death or   injury   to personnel. Wear protective eyewear when inspecting HP   flask    to   avoid eye injury   due to flying    debris. 19 0 0 Valves, HP   Flask (19). Inspect valve for Any   damage damaged shaft, handle, and assembly. Replace is  noted. handle if  broken. 0 (Partially open valve until   air   flow   is  confirmed. Close valve.) o Inspect thermo relief    valve    and pressure relief valve for   damage. L 2-26