Chemical Engineering March 2017 - 80

TABLE 4. EXAMPLE PROCESS DESIGN SHEET
Row
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
Storage tank process datasheet
Client: A1 Chemical Company
Project: Perfect project
Location: Houston
Service: To hold off-specification batch of olefin material
No. required: one (1)
Design conditions
I.D.: 9 m
Internal pressure: (Opt.):
External pressure: (Opt.):
Operating temperature:
Liquid stored: Light olefin (C6, C8, C10)
Specific gravity (Max.): 0.72 at 110°F
Capacity (Working/Max.):
Code: API 650
Radiography: (1)
Hydrotest:(shop/field): (1)
Stress relieve: (1)
Mag. particle: (1)
Windload: (1)
21 Weight (empty/full): (1)
22
Shell
Roof
Nozzle-MH / flanges
Floor
Boot
Lining:
Gaskets:
Bolting:
Internals:
Roof support:
Paint:
Insulation:
Accessories
Insulation rings
Davit
Pipe support rings
Ladder and platform clips
Internal piping
Fire proofing clips
Agitator
Materials of construction
Component
Basic material
Killed carbon steel (2)
Killed carbon steel (2)
Killed carbon steel (2)
Killed carbon steel (2)
Killed carbon steel (2)
N.A.
(1)
(1)
Internal floating roof (3), jet mixer (4)
(1)
(1)
N.A.
N.A.
(1)
(1)
(1)
(1)
(1)
N.A.
continued on next page
lated in Table 2, are acceptable.
In general, tank heights do not exceed
1.5 times the tank diameter. As
the tank height increases, the wall
thickness increases and a bigger
load is imposed on the soil, thus requiring
heavier foundations. Often, for
very large diameter tanks, L/D is kept
less than 1, leading to squatter tanks.
From a fire-fighting point of view, the
maximum tank height considered is
20 m. Tank diameters are standard80
ized
based on shell-plate lengths,
but tank heights are never standardized.
To obtain an economical unit,
it is the tank manufacturer who will
choose the number of courses and
plate widths to obtain the height required
for a given diameter. Hence, a
process or mechanical design engineer
does not necessarily specify the
number of shell-plate courses. The
shell-plate sizes are generally kept as
large as possible and within available
standard sizes so as to reduce the
length of welded seam, loss of plate
material, amount of edge preparation
and the degree of handling during
erection. Shell heights are typically
rounded off to the nearest meter and
as far as possible, standard diameters
are used. For this discussion, we
will consider an L/D of 1 and proceed
with our design.
The initial dimensions quickly obtained
from the table may be used
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
MARCH 2017
0.0361 psig
ATM
110°F
103,500
Roof type: (fixed/floating): Internal floating roof
Blanket gas: Nitrogen
Tag No.: T-1001
Job No.: 820918
Height: 9 m
Design: 0.2167 psig
Design: 0.0625 psig
Design: 150
°F
gal
147,857 gal
Vapor pressure @Tmax: 6 psi(a)
Stamp: yes
Efficiency: (1)
Dye penetrant: (1)
Earthquake: (1)
Corrosion allowance (in.)
1/16
1/16
1/16
1/16
1/16
Orientation: Vertical
Sketch
Rev Issued
for
A
Preliminary
Date
Made
by
Checked
Approved
1-Jan-16 KEPR SISA
KOQU
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Chemical Engineering March 2017

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