D
R
D
p
OD A
R
J
n Q
t
OD of pipe = 10,75 in
Nozzle wall thickness n = 0,5 in
Diameter hole on in reinforcing plate D
R
= 10 78 in Distance shell to flange face, outsideJ
= 10 in Distance shell to flange face, inside
K = 8 in
Length of side of reinforcing plate , L
= 24 ½ Width of reinforcing plate
, W = 30 18 in
Distance from Bottom of tank to center of nozzle :
- Regular , Type H
= 15 in - Low
, Type G = 12 ¼ in
Gambar F.12
Dimensi nozzle
F. Desain Manhole
Manhole adalah lubang pemeriksaan yang diperlukan pada saat pembersihan
atau pemeriksaan pada bagian dalam vaporizer. Direncanakan manhole di
pasang pada bagian atas vaporizer dengan ukuran standar 20 in, berdasarkan rekomendasi API Standard 12 C Brownell and Young, App. F, dengan
spesifikasi : Tebal shell
= 38 in Tebal flange
= 38 in Jumlah
= satu Ukuran potongan : - Weld A
= 316 in - Weld
B = 316 in
Panjang sisi = 45 ½ in
Lebar reinforcement W = 54 in
Diameter manhole, ID = 20 in
Maksimum diameter lubang, Dp = 24 ½ in Diameter plat penutup cover plate
= 28 ¾ in Diameter bolt circle, D
B
= 26 ¼ in Sketsa detail desain manhole ditunjukkan pada Gambar F.7 di bawah ini :
Gambar F.13
Detail desain manhole
G. Menghitung berat total vaporizer
Bahan yang digunakan stainless steel austenitic AISI 316.
steel
= 490 lbft
3
Brownell and Young,1959.hal 156
1. Berat Shell deflector
Data perhitungan : Diameter dalam shell ID= 2,18449 m = 7,16659 ft
Ketebalan shell t
s
= 316 in Diameter luar shell OD = 2,1939 in
= 7,1979 ft Tinggi shell Z
= 25,1 ft
Volume shell = ¼ π × Hs × τD
2
– ID
2
=
4 14
, 3
× 25,1 ft × 0,4497 ft
2
= 886,536 ft
3
Berat shell = Volume shell ×
steel
= 886,536 ft
3
× 490 lbft
3
= 434.402,9925 lb = 197.455,9 kg
2. Berat Dish Head
Data perhitungan : Diameter luar head, ID = 86 in
Ketebalan head t
h
= ¼ in Panjang straight flange = 2,5 in
Inside corner radius = 5,5 in
Untuk t
h
1 in t
d
= ¼ in perkiraan blank diameter b
d
adalah : b
d
= OD +
42 OD
+ 2 . S
f
+ 23 . icr Brownell and Young. Eq.5- 12,p.88 = 96,97 in
= 8,0808 ft Volume dish head = ¼ ð b
d 2
× t
h
= ¼ ð 8,0808
2
0,25 = 1,0679 ft
3
Berat head = Volume head ×
steel
= 1,0679 ft
3
× 490 lbft
3
= 523,2857776 lb = 237,8571 kg Berat head
= 475,71 kg
3. Berat isolator
W = V x ñ R
o
=
isolasi shell
o
t D
2
,
= 3,59895 + 0,0933 = 3,6922889 ft R
i
=
2 D
shell ,
o
= 7,19792 = 3,59895 ft
W =
.
R R
3 2
3 i
3 o
ñ
is
= 271 lbft
3
W = 23 x 3,14 x 3,6922889
3
– 3,59895
3
x 271 = 131,7948 lb
= 59,9067 kg
4. Berat opening
1. Berat manhole Manhole
20 in
=
428 lb
m
Megyesy, pp. 389
Berat tutup = 29,22 lb
m
Megyesy, pp. 384 Berat manhole
= 457,22
2. Berat nozzles Tabel F.6 Perhitungan Berat Nozel
Keterangan Ukuran Nozel, in Berat Nozel, lb
Pipa umpan liquid 6
9,5 Pipa steam masuk
6 9,5
Pipa produk CH
3
OH uap 2
0,61 Total
16 20,22
Berat total Opening =
20,22 lb = 9,18 kg 5. Berat bahan dalam Deflector
“Shell and Tube”
Berat tube
Diameter tube = 0,07667 ft Panjang tube = 12 ft
ρ tube = 490 lbft
3
x l
x ID
W
2
4
