Lloyd's Rules, Glass Reinforced Plastics

[OldYachtie]

Does anyone know where I can get a copy? Googling it isn't working.

"Lloyd's Register of Shipping Rules and Regulations for the Classification of Yachts and Small Craft (Lloyd's Rules), Part 2, Chapter 2, Glass Reinforced Plastics" is what I am specifically looking for.

[Raggi_Thor]

Sorry, no, but try www.dnv.com :-)
tentative rules 1997...

[ChrisF]

email "rules@lr.org"

[FAST FRED]

And remember the LLoyds rules are for an all chopped glass hull.

You can have far lighter and stronger boat with a better layup.

FAST FRED

[ChrisF]

And remember the LLoyds rules are for an all chopped glass hull.

FAST FRED

Huh?? Not true at all. You can use any material properties you like. Unidirectionals, woven roving, various types of glass, aramid, and graphite reinforcements, and polyester, vinylester, epoxy and phenolic resins are all discussed within the rule. I've used it for wood/epoxy, with Lloyds' approval.

[Raggi_Thor]

In DNV's rules they say for example that the hull shell be a certain thickness based on the length of the boat and the speed if the laminate has a strength of 130Mpa. If you use a stronger laminate, the thickness can be reduced by the square root of the ratio (your laminate strength / 130).

[MikeJohns]

Raggi
I have been updating my DNV over the years, the last one the "tentative rules" came with a note saying that they were adopting the ISO rules. So I am presuming that has happened now.

I have not checked but LLoyds was going down that road too. I only have the ISO for metal constructions so I am not sure what the GRP one is like.

Cheers

[Raggi_Thor]

I am waiting for the new ISO rules for plywood skinned boats :-)
They should be available next year, I hope.

With grp, why not use the old rules?

[MikeJohns]

Ragnar

You need to check since the rules are always revised if failure becomes apparent.
Never use earlier ABS rules (pre 96 I think) for GRP since some of the scantlings turned out to be inadequate. If you have old rules check with the society that they are OK to use.

Cheers

[Greybarn]

Why not use the new ISO rules? I think the number is 12215. Covers all types of GRP, FRP, plywood, and aluminum. I don't think they have steel. In the GRP/FRP section you can vary fiber type and resin content to get the material properties and it is all based on the rules of mixtures.

[MikeJohns]

I just looked at 12215-5
I seldom use it as we have USL and DNV as the main Australian standards and all my spreadsheets are set up for compliance matching with those.


Here's the preamble

Scope
This part of ISO 12215 applies to determination of design loads, pressures, stresses, and to the determination of the scantlings, including internal structural members of monohull small craft constructed from fibre reinforced plastics, aluminium or steel alloys, wood or other suitable boat building material, with a length of the hull (LH) according to ISO 8666 of up to 24 m. It only applies to intact boats.


Note that "mild steel" such as A36 is considered a steel alloy which is where you might be getting confused.

cheers

[rxcomposite]

Does anyone know where I can get a copy? Googling it isn't working.

"Lloyd's Register of Shipping Rules and Regulations for the Classification of Yachts and Small Craft (Lloyd's Rules), Part 2, Chapter 2, Glass Reinforced Plastics" is what I am specifically looking for.


You must be referring to Rules and regulations for the Classification of Special Service Craft? It is a rulebook for watercraft that is not defined by "ships" under the IMO rule. Lloyds has a different rulebook for ships.

I'm afraid it is not downloadable. The set of rules is about $400.00 and comes with a software disc for calculating scantlings for composites, steel. or aluminum.

Hope that helps.

[Guillermo]

You must be referring to Rules and regulations for the Classification of Special Service Craft?
Those are the new ones as "Lloyd's Register of Shipping Rules and Regulations for the Classification of Yachts and Small Craft" has been 'discontinued'.

OldYachtie: A copy of what you need may most probably be get from Lloyd's, e-mailing or calling them, maybe even for free if you have a friendly Lloyd's office close to you. I've done this in the past.

[Raggi_Thor]

Maybe a bit off topic, but I did a search for iso 12215 and found this,
http://www.ce-pro.eu.com/Overview/CE-Pro06.htm

Do any of you know this tool, "ce-pro"?

[Guillermo]

Maybe a bit off topic, but I did a search for iso 12215 and found this,
http://www.ce-pro.eu.com/Overview/CE-Pro06.htm

Do any of you know this tool, "ce-pro"?
I've been considering to buy the thing for use at my office, but as I find 12215 is still not widely accepted, I'll wait for the time being. But I'd also love to hear about others' experience with CE-Pro, if any.

[Greybarn]

CE Pro is a compliance tool to help the builder document the boat for CE approval. I don't think it contains the actual standards. Just the checklists which you can download for free from IMCI.

[Raggi_Thor]

Thanks (about ce pro).

I talked to the Norwegian repesentant in the ISO commitee and emailed the Swedish secretary. They both say a new standard for plywoood hulls will be released next year.