Structural simulation erected storage tank with jacking system | MECHANICAL DESIGN TOOLS
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Static Vs Dynamic Finite
Element Analysis
A simulation called dynamic
when some of parameter are
variably in line with time
alteration or can be said time based
simulation. For examp...
Pro-Engineer WILDFIRE
Pro-Engineer adalah software
pemodelan 3D dan gambar
Common tank erection usually from bottom to top
structure but sometimes in certain location its impossible to apply,
for example at tank farm live plant which is hot work not allowed
teknik 2D untuk keperluan
visualisasi desain sehingga
dapat digunakan dalam analisa k...
in certain elevation so other erection method should be developed
in this condition such as application of water curtain, welding
habitat etc.
An alternative method is building it from top to bottom by
using jacking equipment, in this posting I'm not going to discuss
about the erection method since there are so many article and
Stress Simulation
This page will explain what kind
of Stress simulation with Finite
Element Analysis (FEA) in
Msc.Visual Nastran 4D (Vn4D).
The main idea in...
video in youtube with clear explanation, I’d like to share my
previous experience how to decide required
base on structural simulation.
PRELIMINARY DATA:
Tank Spec:
qty of jacking tools
Msc. Visual Nastran 4D
Msc.visual Nastran 4D (vN4D)
adalah software simulasi
dinamik d ari obyek 3D hasil
drawing program CAD
engineering dalam system operasi Win...
Roof type : Dome Roof
Structural simulation erected
storage tank with jacking
system
Diameter : 34747 mtrs
Total Shell Height : 23200 mtrs
Jacking tools spec:
Each Jack capacity = 12 Ton
Common tank erection usually
from bottom to top structure
but sometimes in certain location its
http://fajaryannu.blogspot.com/2016/08/structural-simulation-erected-storage_14.html[3/20/2020 3:15:57 PM]
Structural simulation erected storage tank with jacking system | MECHANICAL DESIGN TOOLS
Max space between jack = 3.5mtrs (from manufacturer)
Max. actual safe wind load at lifting = 15 m/s
impossible to apply, for example at tank ...
Show all
Other Data:
Max Height allowed for hot work = 14 m
Wind speed at site = 35 m/s per year
SIMULATION DATA:
Simulation model build in STAAD-PRO software with sequence as
below:
► 2018 ( 1 )
Jacking device layout inside of tank structure with qty = 34
divided equally at circumference
▼ 2016 ( 2 )
▼ August ( 1 )
Structural simulation erected storage
tank with ja...
► April ( 1 )
► 2010 ( 2 )
► 2009 ( 5 )
► 2008 ( 1 )
ABOUT ME
Fajar Yannu
View my complete profile
Shell Plate thickness arrangement:
TOTAL PAGEVIEWS
http://fajaryannu.blogspot.com/2016/08/structural-simulation-erected-storage_14.html[3/20/2020 3:15:57 PM]
Structural simulation erected storage tank with jacking system | MECHANICAL DESIGN TOOLS
Dead load of roof with all of appurtenance generate by manual
calculate = 119546.5 kg, then additional weight of shell plate will
generated by software.
First erected structure by jack as per picture below:
DESIGN LOAD:
Dead Load (DL)
Roof Load = Roof weight / Top angle Lenght
= 119456.5/(3.14 x 34747) =1092 kg/m = 10706.42
N/m
Roof Life Load (Lr)
Roof life load as per API 650
= 122.1 kg/sq. mtr (apply in top angle)
Roof life load = 122 x roof area / top angle length
=122 x 1042.97 / 109.5 = 1163 kg/m = 11404.97
N/m
Wind Load
http://fajaryannu.blogspot.com/2016/08/structural-simulation-erected-storage_14.html[3/20/2020 3:15:57 PM]
Structural simulation erected storage tank with jacking system | MECHANICAL DESIGN TOOLS
Wind pressure Refer to ASCE, use below equation for height
variation qz = 0.613 Kz Kzt Kd V2 (ASCE 7-10 Para.
27.3.2) P = q G Cp - qi (G Cpi) (ASCE 7-10 Para.
27.4.1) Result as per below table :
With simplification in applying load as hidrostatc load, vary lineary
as per height function
Load Model:
Combination Load:
Shell ring plate analysed with load combination for Allowable
Stress Design as per ASCE 7-10 para. 2.4
1. DL
2. DL + Lr
3. DL + 0.6 W
4. DL + 0.75(0.6W) + 0.75Lr
Design criteria to be applied with max. Von misses equivalent
stress compare with yield strength of plate material
Result for plate stress distribution by STAAD PRO for each
combination load :
http://fajaryannu.blogspot.com/2016/08/structural-simulation-erected-storage_14.html[3/20/2020 3:15:57 PM]
Structural simulation erected storage tank with jacking system | MECHANICAL DESIGN TOOLS
ANALYSIS RESULT:
Max. Plate Stress :
Max Stress caused by Load Combination no.6 DL + LR with
result find
11.8 Mpa < 205/2 Mpa (Plate Yield Strength/Safety Factor) ==>
OK
http://fajaryannu.blogspot.com/2016/08/structural-simulation-erected-storage_14.html[3/20/2020 3:15:57 PM]
Structural simulation erected storage tank with jacking system | MECHANICAL DESIGN TOOLS
Reaction Force
Max. Reaction Force caused in last lifting stage 8 with result find
Max. vertical force that carry by jack device = 11.95 ≤ 12 Ton
==> OK
(below max. jack capacity)
SUMMARY:
1. Plate stress in elastic region for every combination load, no
indication shell plate will deform in plasticity since von
misses equivalent stress result still below yield stress
material
2. Generated Max. reaction force smaller than max. capacity
of jacking device
3. Number of jacking device = 34 ea are sufficient to support
stability and integrity of structure with considering structure
weight and additional wind load
http://fajaryannu.blogspot.com/2016/08/structural-simulation-erected-storage_14.html[3/20/2020 3:15:57 PM]
Structural simulation erected storage tank with jacking system | MECHANICAL DESIGN TOOLS
Diposkan oleh Fajar Yannu
Label: Analysis, STAAD Pro
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About Author:
I'm mechanical engineer with great passion and so
-> calculation -> CAD drafting -> continuous lea
gain expertise in this field ...Read More...
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POST A COMMENT
Derrick . C 19 January 2018 at 01:47
Wonderful explanation.
mechanical designing services
Reply
Hydraulic tank jacking System 11 May 2018 at 04:06
Very nice
Reply
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Structural simulation erected storage tank with jacking system | MECHANICAL DESIGN TOOLS
calculation with an idea or my understanding
that embellish some spot in this blog.
Just keep in mind, all off these tools are
made to speed-up our engineering judgments
so like any software does “Crap input will
generate trash Output”, Engineer sense which
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knowledge comprehension will become main
asset to deliver an optimum design.
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