Designed by :
Project : Above Ground Water Tank
Reviewed by : Cled Bagas
Date : Feb-28-18
Client : SAIPEM S.P.A
Rev. 0
Doc no : AWF-TDC-01
Design Calculation for DN1200 cylindrical shell (Horizontal Tank) according to BS EN13121-3:2006
Given Data :
Vessel Diameter (D) =
1.2
m
Saddle Distance (L) =
1.3
m
Length of Cylinder (Ls) =
2.4
m
51 kg/m2
Internal Pressure (PSop) =
Hydrostatic Pressure (Php) = 6656.92 kg/m2
Design Temperature (TS) = 93
3
°C
Cured Resin density (ρ F ) =
1140
kg/m
Weight of Content(Wc)=
2910
kg
Resin HDT =
150
°C
Weight of Vessel (Wv) =
595.2
kg
Density of Content (ρ F ) =
1000
kg/m3
Wind Pressure (Pwind) =
120.2
kg/m2
Laminate Density =
1600
kg/m3
Width of Saddle (b1) =
0.25
m
Laminate Flexural Modulus Eɸb =
3800
Mpa
Laminate Axial Modulus Ex =
1725
Mpa
Design Factor , K 7.9.5.1,7.9.5.7,Table-7/EN 1994-4/Table-18
Fiberglass properties (Table 3 BS EN 13121-3 2016)
Fiberglass Type
CSM
WR
mass per layer(m) = 0.450
ultimate tensile strength (ui)=
unit Tensile Modulus (Xi)=
CFW
Factor
Unit
2
0.600
0.594
kg/m
200
600
500
N/mm
14000
16000
28000
N/mm
γ M γ F ,i A 1
1.4
Value
1.0
A2
1.5
A3
1.2
A4
1.2
A5
1.0
y F,w y F,p
K5
2.4 1.35 1.50 0.76
Ultimate Tensile Unit Load,
Ulam,k= u1.m1. n1.+ u2 .m2. n2... + uz mz nz _Eq. 12
=
Proposed laminate thickness t (BS 4994)
1.1
0.72
n=
2
1
6
mz=
0.9
0.6
3.56 kg/m
tn =
2
0.7
2.57 mm
5.21
mm
t=
N/mm
Remarks
CSM WR CFW Unit
tc = 2.2
2322.00
layers
2
thickness constant,figure 5
Limit Design Laminate Unit Loading
No of layers
No.
Ui,d,R = ulam,k/(y M .A
A 1 .A
A 2 .A
A 3 .A
A 4 ) Eq.
Eq 9
=
mz=n x m,mass of each layer
743.088
N/mm
tn=(mz)(tc)thickness of each laminate
overall thickness of laminate
Factored External Design Pressure 10.10.3.5
Eq.182
=
180.300
2
kg/m
Check for Circumferencial Unit Load due to vessel weight
Check for Circumferencial Unit Load due to content and
10.10.10.3.1 ,
internal pressure 10.10.10.3.1
Eq.157
Eq.156
126.47
=
N/mm
< Ui,d,R
∴ SATISFACTORY
Check for maximum tensile Unit Load due to Vessel + content +
=
112.25
Ui,d,R ∴ SATISFACTORY
N/mm <
Check for Unit Load at Mid Span 10.10.3.2.3
internal pressure 10.10.10.3.1 ,
Eq.162
where :
Eq.158
=
238.72
N/mm
< Ui,d,R
∴ SATISFACTORY
Check thickness for critical axial buckling unit load 10.3.2
=
47.56
Check the thickness for Max Unit Load due at nadir of Sadle
10.10.4.2.2
Eq.190
W1 = (Wc + Wv)/2
Eq.41
=
220.30
N/mm
< Ui,d,R
∴ SATISFACTORY
Check for critical circumferential buckling pressure 10.3.3
C0 =
=
473.01
kg/m2
> Pd,cr
1.0
Ui,d,R ∴ SATISFACTORY
N/mm <
=
140.16
N/mm <
Eq.189
Ui,d,R ∴ SATISFACTORY
Summary :
CSM =
2 layers
Eq.45
WR =
1 layers
∴ SATISFACTORY
CFW =
6 layers
Thickness =
Eq.187
5 21 mm
5.21