Skipper ETNSTCI - Important Considerations; Welding Notes

Edition: 2021-01-29
Page 5 of 14
ETNSTCI/ETNSTCILF Installation Manual
Important
To comply with POLAR class requirements the Echo sounder transducer should be installed below
any ice belt
An echo sounder transducer installed into a tank with ice protection plate in front will have certain
disadvantages compared without a plate
• The plate will decrease the acoustic signal and decrease the general performance of the Echo
sounder
• The area between transducer and protection plate must be lled with water with no air bobbles
present at all time when echo sounder is in operation. Transducers pinging into air bubbles may
become defective after few minutes of operation.
To install the transducer in a tank with ice protection plate in stead of in a sea valve ush with
the hull result in worse performance (still inside IMO requirement) and higher risk of transducer
damage. Transducer damage in a tank with Ice protection is normally not covered by any SKIPPER
warranty.
”Transducers for Echo Sounder are delivered with a xed cable. Needed attention must be taken to
allow easy replacement/pulling of new cable during maintenance”.
SKIPPER Electronics AS will recommend installation positions if GA-drawings (General
arrangements) and frame drawings are made available for study.
Condition.
The welding to hull structures and structural support of the items may be subject to separate approval by
classication societies for each installation on board a ship.
Standard welding practice, methods and procedures should be observed, but may vary. (See welding notes).
Welding notes!
All bottom parts and anges for welding are precisely machined parts. During welding of these parts
to the ship’s hull plates, careful attention must be paid to avoid construction strain on the bottom
parts and anges.
• Let parts cool down during welding.
• Over heating may change t and form and result in non-conformity with intended sensor/
transducer.
• Welding to thick hull steel plates will exert high stress on bottom parts and anges.
• Especially care must be taken during welding of stainless steel anges.
• Work must be performed by a qualied and certied welder.
SKIPPER Electronics AS