7/31/2019 Self Supported Tank

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A.5.1.1 GeneralThis methodis used forverificationof projects andnon-circular tanks,with a pressure of less than 0.14 bar.

A.5.1.2 Calculation MethodologyCheck the tankin the 3 condi ions described by A.5.1.2.1 to A.5.1.2.3.

Theresult of the 3 conditionsdetermines the minimum thickness to be taken to differentparts of the plating(see

A.5.1.4)

Basedon themain characeris icsof thepla ing(see A.5.1.3), the minimum thickness willbe calcula edaccording

to formulas ADR6.8.2.1.17. Theresult is shown in Table A9(A.5.1.5)

Theminimum required thickness of shell, according to 6.8.1 and 6.8.2 (forplating protected),is shown in Table

A.10(see A.5.1.5)

A.5.1.2.1 Test According to ADR

A.5.1.2.2.Checks ressesin the tes condi ionin accordancewi h EN13 0946.4 (see A.5.1.6and A.5.5) wi h

respect to thevalues reportedin 6.7, namely: = min.0.75Re; 0.5Rm ( SeeTable A.7)

A.5.1.2.3 Condi . 3) Check s ressesin opera ingcondiions (see A.5.1.7and A.5.6)wi h respec to thevaluesof

maximum stresses required, namely: = min.0.75Ret ; 0.5 Rmt (seeTable A.5)

With the calculation pressures equal to those defined in a),b) andc) thefollowing:

a) plaing: maximum workingpressure increasedby thes a ic pressure equivalen to two times theheigh of the

denser the substance tobe transported to the section of the hull design;

b) Provisions:Fron cover of fixed tanks andbo toms tankcon ainers / swapbodies: themaximum opera ing

pressure of increased staticpressure due to 1 times the heightof the denser thesubstance to be transported to the

fund the projectand the dynamic pressure due to 2g push on the bottomfront of the substance;rear-end fixed tank:

the maximum operating pressure increases the staticpressure due to 2 times the height of the denser substance to

be transported back to the fundconcerned;

c) closeddiaphragms: maximum workingpressure increased by the s a ic pressure due to 1 times theheigh of the

substance to be transported to the densest section of shellprojec ;

A.5.1.3 Key features of the tank

Main dimensions (Table A.1);

Pressure induced by the product transported (Table A.2);

Designpressure under serviceconditions (Table A.3);

Temperature (Table A.4)

Mechanicalproperties of materialsforming the shelland accessories (Table A.5);

Rm x A valuesselectedfor calculationof equivalent thickness

(Table A.6);

A.5.1.4 Minimum thicknessadopted

See Table A.8

A.5.1.5 Minimum thickness required

from the calculations (Table A.9);

from thenorm (Table A.10);

A.5.1.6 Checkstresses at the test pressure

shellon the walls (Tables A.11and A.12);

Funds (Table A.14and A.16, for which the valuesof the mechanical and geometrical characteristics A.13 andA.15 in tables)

A.5.1.7 Verifying the stresses under serviceconditions

Circumferential stress on the walls of the Shell(Table A.17and A.18);

Dynamic stressduring transport on the walls of the Shell (A.5.6.2);

Solicia ionof funds (Table A.20 and A.22,for which thevaluesof the mechanical andgeomericalcharaceris icsare given in Tables A.19 andA.21);,

Stressof diaphragms (Table A.24 and A.26,for which the valuesof the mechanicaland geometrical characteristics are given in TablesA.23 andA.25).

A.5.2 data

A.5.2.1 Features tanker

Tank Corps: two free-s andingsec ions wi h trunca edcone be ween.

Tankshell rings interspersedwith circumferentialprofiles extruded, applied with the caps of the diaphragms.

Figure A.1- Features tanker

X = position of maximum bending moment

h = height of product to 96%of profit under the lower edge of the manhole