International Diving Schools Association ______

IDSA OPERATIONAL & ADMINISTRATIVE PROCEDURES - APPENDIX G4
Application form for Assessment to IDSA Level 4 - Closed Bell/Mixed Gas Diver
LAST NAME FIRST NAME
Date of Birth
Address
Nationality
Male/
Female
I certify that the attached lists of Diving and Work Experience are true extracts from my
Logbook(s), and that a copy of my Medical Certificate stating that I am Fit to Dive is also attached
Date of Application
NOTES
Signature
1. The purpose of this assessment is to confirm that the diver named above has the theoretical
knowledge and practical ability required by the IDSA Level 1 (SCUBA Diver) syllabus, by ensuring that
he :
� Has a complete understanding of the principles of safe chamber operations, bell handling
systems, bell breathing gas systems, gas reclaim systems, bell diver heating systems, gas
analysis systems and emergency procedures.
� Understands the principles of closed bell and mixed gas diving operations
� Assist with the launch and recovery of a closed bell, as both bell diver and surface tender.
� Is able to mate and clamp the bell to a deck chamber system, equalise internal pressures and
effect a safe “Transfer under Pressure” of the bell and chamber occupants.
� Can work safely and competently as a bellman, bell diver and surface tender.
� Can demonstrate an understanding of the design, theory and the procedures of closed bell
diving from a dynamically positioned vessel.
2. This will be done by assessing his performance
(a) Either as a Level 3 diver - see Appendix G3.
(b) As a member of a bell diving team in preparing bell and deck chamber system for a saturation dive.
(c) Living in saturation conditions for at least 36 hours (including decompression) commencing at a
depth of at least 50 metres.
(d) Performing 5 bell lockouts, for a minimum of 30 minutes per lockout, at a minimum depth of 75
metres.
(e) Carrying out 2 open water bell runs to a depth not less than 100metres, from a storage depth of at
least 50 metres, acting both as bellman and lockout diver. Lockout time is to be at least 15 minutes
duration.
(f) Whilst acting as bellman, carry out a recovery of an unconscious diver into the bell.
(g) Carry out other emergency drills such as use of emergency through water communications, loss of
surface power, use of bell internal emergency power, diver communication failure, hotwater supply
failure, donning emergency survival equipment, and bell winch failure.
(Publications – OAP) 9 December 09 91