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Updated February, 2006

When these tests were conducted the vessel had all of her bottom coatings in place. In order to establish a baseline for the ultrasound several areas were selected as potential areas of interest visually and then ground to bare metal. The results of these areas shows as the low values of the plating. It is assumed, and is also bore out by further clean grind test spot that the 2 part epoxy primer coatings are relativly uniform in thickness as they were sprayed.

Maritile Risk & Loss Control Technologies
PO Box 1322
Kingston, Ontario
K7L 5C6
Phone fax (613) 452 7464

Affiliation and Accreditations with:
ABYC,NFPA, SNAME, RIMS, CSNDT, Society of Accredited Marine Surveyors.

November 17, 2004

Ultrasound inspection of the 1971 trawler-styled steel yacht Defiance. Conducted on November 1, 2004; Canadian registry number 0331700, at the port of Ottawa to Robin Morrish.

 

The keel side plating showed readings as follows:

   .242, .209, .199, .164, .176, .215, .222, .234, .187, .179, .174, 173, .235, .265, .275, .240, .175, .190, .233, .145, .275

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The bottom and side plating below the waterline showed the following:
.238, .238, .218, .232, .248, .228, .222, .232 Nominal thickness of .250 or 92%

Port Side Readings from bow to stern

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The Bow Section, is strip plated to a heavier guage .273, .257, .251. (Nominal Thickness of .313")

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The main focus of the Ultrasound examination was on the keel due to the fact that it is not accessable from the inside and some damage had occurred.

There is one point of impact damage to the keel shoe roughly below the wheelhouse which measured .338". this is repairable damage by welding a bead or two accross the damaged area to restore the thickness close to the original thickness of .375"

There is an bulge in the keel amidships measuring roughly 7" by 18" which appears to have been created by water accumulating in the keel and repeated freezing while the boat was wintering ashore. This area has been identified as a void under the engine room that may have been originally intended to be a midships ballast tank. The keel is not integral to the hull structure and the damage should not compromise the sea-keeping abilities of the hull, therefore no particular repairs are wanted at this time. The void does have a few low level drains that should be removed for winter storage, and there is also a standpipe in the engine room which should be threaded and capped to prevent unwanted bilge water from accumulating into the void.

(Capt) Ian G, Campbell AMS, CRM, Mar Eng.












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Please note the images have be deliberately enhanced to show every possible flaw.

New Ice Certified Through Hull Construction

You can compare the new fabrication and mounting to the original ,but ABYC compliant TH mounting as seen below for the aft cabin head raw water inlet. It has several problems mostly that it can not be serviced from inside and there are 8 bolts that must be maintained for security from electrolis.

click image for a very large inspection image


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Note the vast difference in pipe thickness between the normal scantling and the one that is being used to the left. I have now obtained the materials to proceed with creating Ice recommended insulations's of existing through hull fittings. This was much more complex than you might think as it required securing a section of 2" seamless pipe, with a 0.25 wall thickness. No wonder this is the recommended install the through hull penetration' is constructed of materials 3 times as thick as the hull. The hull would buckle before you split a fitting assuming they are checked for flaws prior to insulation.

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Below the cabin sole in the aft cabin is a large sump with access from lifting center hatches. There are numerous service lines and the main propeller shaft running through the space.

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There is a 3/4"bronze through-hull located on the station corresponding to the mid cabin bulkhead. The through hull is mounted by means of a doubler and bolted through hull fitting. The still standing plan is to create a new ice compliant through hull using the newly fabricated internal flanges that will be the new outlet for grey water from the aft cabin. Draining the galley sinks, washbasin and bath. This will eliminate the need for a above the waterline drain from the galley sink with a large enough diameter to handle kitchen food preparation remains without clogging.

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Survey Comment: The arrangement is satisfactory for fresh water, but could pose electrolysis difficulties unless all dissimilar components are satisfactorily bonded.

Ships plan:The existing through hull connections are replaced with the schedule 120, "extra strong (pipe) stand off's as described in this document. The design and specifications are specific to Canadian Ice for passenger vessels. See survey report here.

Concept Direction by owner: I will proceed to make up the stand off's and flanges for ALL.



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The information presented here on the web site is believed to be correct, but not guaranteed against errors or ommission.
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