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colin1325

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About colin1325

  • Birthday 13/05/1960

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  • Gender
    Male
  • Location
    cornwall
  • Interests
    fishing, astronomy,

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    fish/chip
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    colin1325
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  • Website URL
    http://www.pvabags-katchkarp.co.uk

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  1. Overplating v replating

    Just seen this The dangers of overplating Posted on March 17, 2017 by News Hound Surveyors take note – overplating does not constitute a repair on a steel hull Feature article written by Alan Broomfield MIIMS, who tackles the thorny subject of overplating on steel hulled vessels, in particular Dutch barges and Narrowboats. It is common practice when in the field surveying steel vessels to find mild steel plates welded to the hull, a practice regularly carried out on leisure vessels as a permanent repair. If any defects are found on the shell of a metal boat during a survey, surveyors are all too quick to recommend that the area concerned be overplated. Marine surveyors who deal with steel vessels will find that very often – Dutch barges and canal boats in particular – are frequently heavily overplated and should remember at all times that such overplating does NOT constitute a repair. It merely hides the defect. I have recently seen an overplating welded job done to an existing doubling plate on a Dutch barge moored on a gravel tidal mooring. The result was a two foot crack in the second over plate allowing water to down flood between the plates nearly sinking the vessel which was only saved by the occupants having sufficient bilge pumps to keep her afloat until she could get into dock. I feel overplating should never be allowed on an existing doubling plate even though such bad practice is often found. It is a very bad practice and should be condemned and highlighted within our reports. If doubling or overplating is found on a vessel, the marine surveyor should remember the Law of Unintended Consequences. Wherever possible, doubling or overplating should be avoided and any defective steel cropped out and renewed. It should never be carried out on round bilges and never doubling over existing doubling plates. However, one occasionally sees this and it should be strictly taboo. Doubling or overplating can only ever be regarded as bad practice, a cheap bodge job and is intellectually dishonest. It is often carried out on leisure vessels to cover over areas of pitting which is not necessarily the best solution. Pitting, if small in area and localised, is often best dealt with by back filling the pits with welding rather than extensive overplating. Pitting on non structual interior bulkheads can often be satisfactorily filled with a plastic metal paste such as Belzona but this method of repair should not be used on shell plating. Plastic metal should only be used on single pits on water/ballast tank plating or in areas where heat is not allowed or unsafe (fuel tanks). Finally, the marine surveyor should remember that overplating, though a common practice, is often carried out without thought as to the unintended consequences. We should realise that it adds weight to the vessel’s structure without adding much compensating volume and, as a direct result, the vessel necessarily sinks lower in the water. It also has a number of other unintended and often unrealised side effects. 1. By increasing the draft, it reduces the available freeboard and, therefore, the amount of reserve buoyancy. 2. It also, therefore, reduces the transverse metacentric radius (BMT), and slightly, increases the height of the centre of buoyancy (KB) usually with very little compensating reduction in the height of the centre of gravity (KG) so that the end result is a reduction in the metacentric height (GM) and a negative alteration to the characteristics of the statical stability curve i.e. a reduction in the maximum GZ value and the range of positive statical stability. [The average metacentric height of a narrowboat is about 150 mm (6 inches)]. 3. It may also, depending upon where the overplating is sited, alter both the longitudinal trim and the transverse heel of the vessel with further indeterminate alterations in her statical stability curve. 4. It lowers the deck edge immersion angle and, therefore, any downflooding angle(s). 5. The double plating is usually not secured to the primary supporting structure – the shell side framing. It is also rarely fitted with centre plate plug welds and is dependent only on the edge weld for security. 6. The double plating is secured only at its edges and the greater the area of plate, the smaller the length of the attachment weld per unit area and, therefore, the greater the stresses in those welds. 7. The corrosion or pitting, being the reason for fitting the doubling plates, means the corrosion or pitting will still remain there and, if it is on the inside of the original shell plate, will still be increasing. Doubling, therefore, is merely hiding the problem, not repairing it. The marine surveyor should remember that time spent considering the consequences of his actions is never wasted. A lot (too many) of boats, particularly inland narrow boats and private pleasure boats, are doubled or over plated to various degrees in both terms of area and quality of welding and finish. When presented with a vessel that has a length of 6 mm plate some 250 mm or so wide welded astride the normally laden waterline, it is not unreasonable to conclude that the plating in way has severe corrosion or pitting (for whatever reason) and that somebody in the past has recommended overplating as a cure. At this point the marine surveyor’s mind should go into cause and effect mode and ask “How extensive was the defect? Could it have been more simply rectified by grinding out and back welding an area of pitting? Was the corrosion arrested before the doubling was fitted?” That said many of those questions are academic as the answers to most of them are well and truly hidden from view which only leads to speculation. In cases where the marine surveyor finds the situation described applied to both sides of the hull, another question arises – “Did both sides of the vessel’s hull exhibit the same degree of damage or was the double plating simply applied to both port and starboard sides to ensure maintenance of lateral stability or appearance?” If the plate is badly pitted or where the actual thicknesses, as measured, of bottom or side shell plating fall below allowable minimum, the metal structure in way requires remedial treatment within time limits to be laid down by the marine surveyor. It is, in the author’s opinion, (and for that matter also apparently that of the MCA who will not allow doubling plates of any size – particularly on passenger boats – to be fitted except as a ‘get you home’ emergency measure) far better to crop out such thin areas back to metal of an acceptable thickness and renew the plate in way although it is accepted that that is more difficult, time consuming and costly.
  2. DISTANCE NOT IMPORTANT IN CONTINUOUS CRUISING: THE COURT JUDGEMENT CRT TRIED TO HIDE December 8, 2014 nick_theboatman A recent judgement in a Section 8 case confirms that it would be unlawful for Canal & River Trust (CRT) to set a minimum distance that continuous cruisers must travel to comply with the law. The judgement in the case of CRT v Mayers states that repeated journeys between the same two places would be “bona fide navigation” if the boater had specific reason for making repeated journeys over the same stretch of canal. HHJ Halbert also stated that any requirement by CRT to use a substantial part of the canal network was not justified by Section 17(3)(c)(ii) of the British Waterways Act 1995 because the requirement to use the boat bona fide for navigation is “temporal not geographical”. In addition, Judge Halbert determined that a boat with a permanent mooring is not required ever to use its mooring. Indeed, during the course of argument CRT conceded that if Mr Mayers acquired a home mooring, he would be left undisturbed even if he did not use the mooring, provided that he did not exceed the limit of 14 days in one place. The judgement was handed down in November 2013 but CRT has not published it, unlike other judgements in Section 8 cases. Yet despite knowing about this judgement for a year, CRT is currently attempting to set a minimum distance that continuous cruisers must travel in order to comply with the law. CRT held two meetings with boating user groups on 22nd September and 3rd November 2014 in which it tried to persuade the groups to agree a minimum distance that boaters without home moorings must travel every three months and over their licence year to avoid enforcement action. CRT did not disclose this judgement at either meeting. In 2011, BW re-wrote the Mooring Guidance for Continuous Cruisers to remove the words “the law requires a genuine progressive journey (a cruise) around the network or a significant part of it” as a result of the judgement in British Waterways (BW) v Davies. The guidance was renamed Guidance for Boaters Without a Home Mooring. In 2003, British Waterways tried to introduce the Draft Moorings Code or Lock Miles Rules, which would have required continuous cruisers to travel at least 120 different lock-miles every three months without using the same stretch twice. This draconian proposal was dropped by British Waterways following the threat of legal action by a boating user group and in 2004 the Mooring Guidance for Continuous Cruisers was published instead. In spite of this judgement CRT started court action in early 2014 against a boat dweller who did not use his home mooring. It has now dropped the Section 8 claim against liveaboard Tony Dunkley. The relevant paragraphs of the CRT v Mayers judgement are reproduced below. 7.22.3 I consider the requirement imposed by CRT that a substantial part of the network is used cannot be justified by relying solely on section 17(3). That section requires “bona fide navigation throughout the period of the licence” not “bona fide navigation throughout the canal network”. The requirement is temporal not geographical. In my view it does NOT follow from: “Such journey or cruise must take place “throughout the period of the licence” that it “therefore requires progression round the network or at least a significant part of it” 7.22.4 If a person who lived permanently on his or her boat had specific reason for making repeated journeys over the same stretch of canal between two points sufficiently far apart to be regarded as different places, it would in my view be purposeful movement by water from one place to another and hence “bona fide navigation”. In the course of argument I used the example of someone who lived on his boat but was also using the vessel commercially to move coal from a mine to an iron foundry only a few miles away and then returning empty for another load. 7.22.5 To take an extreme example, in its heyday, the Mersey Ferry operated continuously to and fro over the same stretch of water which is less than a mile wide. No one would ever have accepted the suggestion that the ferry boats were not bona fide used for navigation throughout the period of their operations.
  3. Stair lift to disabled access

    Hi all Thanx for your thoughts and ideas food for thought one thing's for sure it won't be straight forward lol life never is though colin
  4. Stair lift to disabled access

    Hi has anyone or is anyone using a stair lift on a WB / nb regarding disabled access Hi any thoughts about a stairlift ie .. stanna type colin
  5. Hi has anyone thought about a stairlift .Second hand one would be good colin
  6. hi all which are the uks quietest canals least used?

    Really great link Thanx colin
  7. hi all which are the uks quietest canals least used?

    thanx your a buzz oh im a secret agent for the crt and we dont like quiet canals we need more holiday companies ill pass these names on
  8. hi anyone considered which are the uks least used quietest canals? look foward to your replies
  9. Reclaiming VAT?

    Hi my wife is disabled could we claim vat back on a new boat narrow or otherwise colin
  10. powering a washing machine ?

    Thanx brilliant as usual
  11. powering a washing machine ?

    thanx for answers hi i did think that would might b an option cheers colin
  12. powering a washing machine ?

    hi other than marina hookup what other way can u run a w/m t/d cheers
  13. Hi cheers oh well another idea grounded
  14. hi cheers for answers . ive seen something called a power lift and same thing but cheaper motor lift but they only lift to a height of 24" 600mm ... generally would that be high enough to get up to the deck from inside floor?
  15. hi i realise that this thread is an old one but does anyone know is it easy to get a lift fitted bow and stern to a narrowboat these days also any suppliers out there it seems hard to flush em out colin
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