This checklist is an overview intended for use with the detailed Operating Procedures (OPs) from the appropriate equipment O&M technical manual.

A. Basic Preparation:

_ 1. Verify that a recompression chamber, Diving Officer, and Diving Medical Officer shall be present on the diving station for dives of more than 190 fsw.

_2. Verify that proper signals indicating underwater operations being conducted are displayed correctly.

_3. Ensure that all personnel concerned, or in the vicinity, are informed of diving operations.

_4. Determine that all valves, switches, controls, and equipment components affecting diving operation are tagged-out to prevent accidental shut-down or activation.

_5. Verify that diving system and recompression chamber are currently certified or granted a Chief of Naval Operations (CNO) waiver to operate.

B. Equipment Protection:

_ 1. Assemble all members of the diving team and support personnel (winch operators, boat crew, watchstanders, etc.) for a predive briefing.

_2. Assemble and lay out all dive equipment, both primary equipment and standby spares for diver (or standby diver), including all accessory equipment and tools.

_3. Check all equipment for superficial wear, tears, dents, distortion, or other discrepancies.

_4. Check all masks, helmets, view ports, faceplates, seals, and visors for damage.

_5. Check all harnesses, laces, strain reliefs, and lanyards for wear; renew as needed.

_ Ensure that all Operating Procedures (OPs) have been completed in accordance with UBA

MK 21 MOD 1 Technical Manual, NAVSEA S6560-AG-OMP-010-UBA-21/1.

_ Ensure that all Operating Procedures (OPs) have been completed in accordance with UBA

MK20 MOD 0 Technical Manual, NAVSEA SS6OO-AK-MMO-O1O/MK 20 MOD 0.

E. General Equipment:

_ 1. Check that all accessory equipment - tools, lights, special systems, spares, etc., - are on site and in working order. In testing lights, tests should be conducted with lights submerged in water and extinguished before removal, to prevent overheating and failure.

_2. Erect diving stage or attach diving ladder. In the case of the stage, ensure that the screw pin shackle connecting the stage line is securely fastened with the shackle pin seized with wire or a safety shackle is used to help prevent opening.

F. Preparing the Diving System:

_ 1. Check that a primary and suitable back-up air supply is available with a capacity in terms of purity, volume, and supply pressure to completely service all divers including decompression, recompressions and accessory equipment throughout all phases of the planned operation.

_2. Verify that all diving system operating procedures have been conducted to properly align the dive system.

_3. Ensure that qualified personnel are available to operate and stand watch on the dive system.

Figure 6-21a. Surface-Supplied Diving Operations Predive Checklist (sheet 1 of 3). CHAPTER 6 — Operational Planning


(Sheet 2 of 3)

_4. Compressors:


Determine that sufficient fuel, coolant, lubricants, and antifreeze are available to service

all components throughout the operation. All compressors should be fully fueled,

lubricated, and serviced (with all spillage cleaned up completely).


Verify that all diving system operating procedures have been conducted properly to align

the dive system.


Check maintenance and repair logs to ensure the suitability of the compressor (both

primary and back-up) to support the operation.


Verify that all compressor controls are properly marked and any remote valving is tagged

with "Divers Air Supply - Do Not Touch" signs.


Ensure that compressor is secure in diving craft and shall not be subject to operating

angles, caused by roll or pitch, that will exceed 15 degrees from the horizontal.


Verify that oil in the compressor is an approved type. Check that the compressor oil does

not overflow Fill mark; contamination of air supply could result from fumes or oil mist.


Check that compressor exhaust is vented away from work areas and, specifically, does

not foul the compressor intake.


Check that compressor intake is obtaining a free and pure suction without contamination.

Use pipe to lead intake to a clear suction if necessary.


Check all filters, cleaners and oil separators for cleanliness IAW PMS.


Bleed off all condensed moisture from filters and from the bottom of volume tanks. Check

all manifold drain plugs, and that all petcocks are closed.


Check that all belt-guards are properly in place on drive units.


Check all pressure-release valves, check valves and automatic unloaders.


Verify that all supply hoses running to and from compressor have proper leads, do not

pass near high-heat areas such as steam lines, are free of kinks and bends, and are not

exposed on deck in such a way that they could be rolled over, damaged, or severed by

machinery or other means.


Verify that all pressure supply hoses have safety lines and strain reliefs properly attached.

H. Activate the Air Supply in accordance with approved OPs.

_1. Compressors:


Ensure that all warm-up procedures are completely followed.


Check all petcocks, filler valves, filler caps, overflow points, bleed valves, and drain plugs

for leakage or malfunction of any kind.


Verify that there is a properly functioning pressure gauge on the air receiver and that the

compressor is meeting its delivery requirements.

_2. Cylinders:


Gauge all cylinders for proper pressure.


Verify availability and suitability of reserve cylinders.


Check all manifolds and valves for operation.


Activate and check delivery.

_3. For all supply systems, double check "Do Not Touch" tags (tags outs).

Figure 6-21b. Surface-Supplied Diving Operations Predive Checklist (sheet 2 of 3).

Figure 6-21b. Surface-Supplied Diving Operations Predive Checklist (sheet 2 of 3).

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