Load line regs

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Vegman
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Load line regs

Postby Vegman » Tue Oct 09, 2018 6:09 pm

Hi , hoping someone has had this issue before.
We are replacing the overboard discharge butterfly valve for a fresh water generator in drydock , but the class surveyor is telling us that it has to be a non return valve as per load line regs. I think he is wrong.
The system was fitted from new building in the 90's but has been blanked off for the last five years. We are just putting it back as per the original ships drawings which show a butterfly valve at the O/B and must have been approved by Class.
The load line regs 22 states ;
Discharges led through the shell either from spaces below the freeboard deck or from within superstructures and deckhouses on the freeboard deck fitted with doors complying with the requirements of Regulation 12 shall be fitted with efficient and accessible means for preventing water from passing inboard. Normally each separate discharge shall have one automatic non-return valve with a positive means of closing it from a position above the freeboard deck.

I think the key here is the word "spaces" . This is not meant to apply to closed systems.
I think the regulations is meant to apply to system that are open at one end , like bilge systems, sanitary systems, scuppers.

I do remember having this argument many years ago in a small ship yard that was building a luxury yacht to survey, and I am sure that was the decision.
Has anyone else been down that road?

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JK
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Currently located: East Coast, Canada

Re: Load line regs

Postby JK » Wed Oct 10, 2018 8:03 am

Are they the most recent version? Anytime this has happened to me, reinstalling meant complying to most recent not as-built.
Second thought, it doesn't necessarily mean you are looking at the as-built. You could be referring to a drawing that was never updated to what was installed.

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Big Pete
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Re: Load line regs

Postby Big Pete » Wed Oct 10, 2018 11:35 pm

All valves connected to the ships shell or side plating have to be spheroidal Graphitic cast iron or cast steel, if they fracture and break off the ship will sink!
Similarly if the pipe between your Fresh Water Generator and the overboard valve rusts through- Hot concentrated Salt Water so very likely-, you could sink the ship.
There might have been a separate non return valve in addition to the Butterfly valve, if they were wasn't any pipe between the shell plating and the two valves that would be OK. Whatever valves you fit should not cause any back pressure on the FWG or you will lose vacuum and water output.
I can't quote chapter and verse on the Regs but it is common sense and your safety.

BP
It is always better to ask a stupid question than to do a stupid thing.


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