structural design of fast small boats < 12m

[ringoo83]

What rules have to be applied for the purpose of structural design of fast small boats < 12m ??
If I assumed that a 6 m monohull pleasure boat with 20 knots speed, complies with the eq. that deifines a high speed craft according to HSC code; Is it still right to use the GL (Yacts & boats up to 24m) rules or I have to chande to GL HSC rules.

After a fast review of some rules I noticed:
ABS HSC Rules applicable to crafts > 12m
ISO 12215-5 applicable to crafts up to 24m
GL yachts and boats rules applicable to crafts up to 24
GL HSC – applicable length is unknown???????

I'm really confused.

Appreciate any advice especially in regard to the free rules.

Application Limits of (ABS) HSC Rules:
This Guide is applicable to high speed craft for commercial or governmental use constructed of steel,
aluminum, or FRP and having V / L not less than 2.36 where L>12m
Vessel Type Applicable Length
Mono-hull < 130 m (427 ft.)
Multi-hull < 100 m (328 ft.)
Surface Effects Ship (SES) < 90 m (295 ft.)
Hydro Foil < 60 m (197 ft.)

According to High Speed Craft Code (HSC Code):

A high speed craft is a craft capable of max. speed: 3.7 Disp.e1.667 m/s
where Disp. (m^3)


(INTERNATIONAL CODE OF SAFETY FOR HIGH-SPEED CRAFT, 2000), unless expressly provided otherwise, does not apply to:
.1 craft of war and troopcraft;
.2 craft not propelled by mechanical means;
.3 wooden craft of primitive build;
.4 pleasure craft not engaged in trade; and
.5 fishing craft


ISO 12215-5.2
Hull construction — Scantlings — Part 5: Design pressures for monuhulls, design stresses, scantlings determination

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.

Germanischer Lloyd. 3 Special Craft - 3 Yachts and Boats up to 24 m
1.1 Application
These rules apply to pleasure craft of length L from 6to 24 m and provided that the pleasure craft classed and approved in accordance therewith are at all times employed exclusively under the conditions for which they have been designed, constructed and approved
and that they are in the sense of good seamanship correctly handled and equipped and operated at a speed adopted to the respective seaway conditions

[conceptia]

Go with ISO.. a friend of mine told me that the ABS rules for vessels with L<24 m has been omitted to give space for ISO to fill up that vacancy.
So, my suggestion is ISO.. all the best..

[Alik]

ISO12215 or LR SSC

[ringoo83]

Alik,

I have noticed in many of your posts that you use ISO-12215 for your designs, I can't buy this standard but I got the initial public draft of it which was made in 2004. Could you plz tell if there is any modification/differences between this draft and the current ISO 12215

Thanks in advance

[Alik]

ringoo83, You better use final version of standard for official assessement. The draft works, but there are some changes - say, definitions of design accelerations, etc.

[Ike]

I would agree with ISO. The EU uses the RCD, (Recreational Craft Directive) which is taken driectly from ISO.