CHAPTER 8 Surface-Supplied Air Diving Operations
Change A 8-33
stability when applying force (as to a wrench), or when working with a power
tool that transmits a force back through the diver.
Tying a hogging line to the work also gives the diver leverage while keeping
him close to his task without continually having to fight a current.
Safety Procedures. The best safety factors are a positive, confident attitude about
diving and careful advance planning for emergencies. A diver in trouble under-
water should relax, avoid panic, communicate the problem to the surface and
carefully think through the possible solutions to the situation. Topside support
personnel should implement emergency job-site procedures as indicated in
Chapter 6. In all situations, the Diving Supervisor should ensure that common
sense and good seamanship prevail to safely resolve each emergency.
Emergency procedures are covered specifically for each equipment in its appro-
priate operations and maintenance manual and in general in Chapter 6. However,
there are a number of situations a diver is likely to encounter in the normal range
of activity which, if not promptly solved, can lead to full-scale emergencies. These
situations and the appropriate action to be taken follow.
Fouled Umbilical Lines. As soon as a diver discovers that the umbilical has
become fouled, the diver must stop and examine the situation. Pulling or tugging
without a plan may only serve to complicate the problem and could lead to a
severed hose. The Diving Supervisor is notified if possible (the fouling may
prevent transmission of line-pull signals). If the lines are fouled on an obstruction,
retracing steps should free them. If the lines cannot be cleared quickly and easily,
the standby diver is sent down to assist. The standby diver is sent down as normal
procedure, should communications be interrupted and the tender be unable to haul
the diver up. The standby diver, using the first divers umbilical (as a descent line),
should be able to trace and release the lines. If it is impossible to free the first
diver, the standby diver should signal for a replacement umbilical.
Fouled Descent Lines. If the diver becomes fouled with the descent line and
cannot be easily cleared, it is necessary to haul the diver and the line to the surface,
or to cut the weight free of the line and attempt to pull it free from topside. If the
descent line is secured to an object or if the weight is too heavy, the diver may
have to cut the line before being hauled up. For this reason, a diver should not
descend on a line that cannot be cut.
If job conditions call for using a steel cable or a chain as a descent line,
the Diving Officer must approve such use.
Falling. When working at mid-depth in the water column, the diver should keep a
hand on the stage or rigging to avoid falling. The diver avoids putting an arm over-
head in a dry suit; air leakage around the edges of the cuffs may change the suit
buoyancy and increase the possibility of a fall in the water column.
Damage to Helmet and Diving Dress. If a leak occurs in the helmet, the divers
head is lowered and the air pressure slightly increased to prevent water leakage. A