Pre-Dive Checks; Mechanical; Depth Rating - Teledyne 440 System Manual

6 – Operating Procedure

6.2 Pre-dive Checks

DeepView for Windows has a comprehensive Help structure written specially for
it. The Help structure includes a set of pre-dive checks that you should perform
before you deploy the 440 System underwater. You may configure DeepView for
Windows to display a summary of these checks automatically after you complete
the System Configuration Wizard.
The pre-dive procedure requires you to check the mechanical installation, the electrical and
communications connections throughout the System, and its configuration. You should perform these
simple and sensible checks on the System as a routine part of every survey deployment. They should
not take long to complete and will help to prevent expensive mistakes.

6.2.1 Mechanical

6.2.1.1 Depth rating

Note that the depth rating of sub-sea components will be impaired if the housings suffer from damage
or corrosion, or if they have been disassembled and reassembled carelessly.
To maintain the depth rating of your 440 System:
❐
Wash the sub-sea installation with clean fresh water and inspect the sub-sea housings for
damage after each survey operation. Make any necessary repairs as soon as possible. Never
deploy the System on a survey if any of the sub-sea housings show signs of damage.
❐
Install the housings where there is no danger of damage from snagging on debris or contact
with other equipment on the ROV. Secure the housings so that they cannot move or vibrate
against the ROV frame.
❐ Follow the instructions in
electrical grounding of the 440 System.
❐
Do not open the sub-sea housings without good reason. Follow the instructions in
9.2.2 "Sub-sea Installation" on page 9-6
ings. Check the condition of the O-ring seals and apply a very thin coating of the same silicone
oil that you use to maintain the connectors – see
on page 4-3.
When opening the sub-sea housing Teledyne TSS recommend that you use
screws inserted into the drilled holes to jack the endcap off. Under no circum-
stances should a screwdriver (or similar) be used to lever the endcap off as this
will result in damage to the o-ring seal and the casing.
6-4
NOTE
section 4.1.1 "Ground Connections" on page 4-3
to disassemble and reassemble the sub-sea hous-
NOTE
© Teledyne TSS
section 4.1.2 "Care of Sub-sea Connectors"
DPN 402196 Issue 4.1
concerning the
section