Section 3 Hull envelope design criteria
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Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 5 Design and Load Criteria - Chapter 4 Local Design Criteria for Craft Operating in Displacement Mode - Section 3 Hull envelope design criteria

Section 3 Hull envelope design criteria

Parent topic: Chapter 4 Local Design Criteria for Craft Operating in Displacement Mode

3.1 Hull structures

3.1.1 The design pressures, in kN/m2, to be used to determine the scantlings of structural elements are to be taken as specified in Table 4.3.1 Design pressures for displacement craft.

Table 4.3.1 Design pressures for displacement craft

Category/location Craft type Symbol Plating pressure Min. Symbol Stiffener pressure Min.
Mono-hull craft
Bottom shell Basic craft P BP Greater of   P BF Greater of  
H f S f Ps δf H f S f P s
H f S f G f P dh δf H f S f G f P dh
H f S f G f P f δf H f S f G f P f
Side shell   P SP P BP   P SF δf P BP  
Mono-hull craft
Bottom shell Partially submerged hulls P BP Greater of   P BF Greater of  
H f S f P s δf H f S f P s
H f S f G f P dh δf H f S f G f P d h
H f S f G f P f δf H f S f G f P f
Fully submerged hulls P BP Greater of   P BF Greater of  
H f S f P s δf H f S f P s
H f S f G f P f δf H f S f G f P f
Outboard side shell   P SP P BP   P SF δf P BP  
Inboard side shell   P SP Greater of   P SF Greater of  
P BP δf P BP
1,6 P WDP at wet deck 1,9 P WDP at wet deck
Wet deck   P CP Greater of   P CF Greater of  
H f S f P s δf H f S f P s
H f S f P pc δf H f S f P pc
Components
Weather deck, see Note 1   P WDP Greater of 7 P WDF Greater of 7
H f S f G f P wh δf H f S f G f P wh
P cd P cd
Coachroof, see Note 1   P CRP H f S f G f P wl 7 P CRF δf H f S f G f P w1 (see Note1) 7
Interior deck   P IDP Greater of 3,5 P IDF Greater of 3,5
H f S f P wh δf H f S f P wh
P cd P cd
Deckhouses, bulwarks and superstructure   P DHP H f S f G f P dhp   P DHF δf H f S f G f P dhp  
Deckhouse windows of toughened safety glass   PDHP Hf Sf Gf Pdhp        
For windows on first tier and deckhouse fronts

All other windows

 7

5
Inner bottom   P IBP H f S f P m + P h 10T P IBF δf ( Hf Sf Ps + Ph ) 10T
Watertight and deep tank bulkheads   P BHP P bh   P BHF P bh  

Note 1. G f is not to be taken less than 1,0.

Note 2. The result of each row in each cell is found as the product of all items on that row in that cell.

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