This document discusses the calculation of ballast pump installation for a ship. It provides ship specifications and calculates the ship's displacement and weight of ballast water needed. It then calculates the required capacity, diameter of the main ballast pipe, and head losses in the suction and discharge pipes. Finally, it concludes the total head losses required and provides the specifications for the main ballast pump and general service pump.

1. POMPA HORIZONTAL DAN VERTIKAL
FA H R I P R I A M B U D I
5 0 1 9 2 2 1 1 5 9

2. Pompa Vertikal
Adalah pompa yang motor penggerak terletak di atas
pompa, dan poros motor diorientasikan secara vertikal.
Motor dapat digabungkan dekat dengan gearbox atau
kopling, artinya hanya digabungkan melalui penggunaan
braket pengatur jarak yang bertindak sebagai penopang
motor

3. Pompa Horizontal
Pompa Horizontal adalah pompa yang mempunyai desain dimana kepala pompa terletak
berdekatan dengan motor pada bidang horizontal. Dihubungkan dengan flange to flange dan
terdapat rubber atau gland packing bertujuan untuk menghindari bocoran akibat getaran pada
saat pompa running.

4. Perbedaan Pompa
Vertikal dan Horizontal

5. CONTOH PERHITUNGAN INSTALASI POMPA DI BIDANG MARINE
FA H R I P R I A M B U D I
5 0 1 9 2 2 1 1 5 9

6. Perhitungan Instalasi Pompa Ballast
a Ship Data
Lpp : 115.00 m
L /
B =
7.188
Lwl : 119.60 m
B /
L =
0.139
B : 16.00 m
T /
L =
0.047
H : 8.00 m
T : 5.40 m
Cb : 0.641
Vs : 16.2 Knot
: 8.33 m / s
ρ : 1.025 ton / m3
(density of sea water)
υ : 0.000001030 m2
/ s (viscosity of sea water)
g : 9.81 m / s2
b. Calculation of Volume displacement (▼)
▼ = L X B X T X Cb
= 147,97 x 24,25 x 8,45 x 0,779
= 6623.74 m3
c. Calculation of displacement ( ∆ )
∆ = ▼x ρ
= 23619,98 x 1.025
For the calculation of ballast tanks is based on the
"Marine Auxiliary Machinery and Systems" book,
page 453, ballast water weight ranges between 10-
20% of ship displacement , where the ship
displacement and weight of ballast water are as
follows:
= 6789.33 Ton
Ballast
(Wb)
= 13% x Δ
= 13% x 24210,48
= 882.61 ton
V
water
ballast
= W ballast / γ sea water
= 861.09 m3
volume of ballast tank
=
916.97 m3
(from general arrangement)
d. Calculation of capacity ballast pump
Volume is planned to be vacated in
time =
8 hours
So this capacity is
Q = V / t
= 916.97/10
= 114.6 m3
/hr
= 0.03 m3
/s

7. Perhitungan Instalasi Pompa Ballast
e. Calculation of diameter main pipe ballast
Q = A x v
Where :
A = area of pipe = π x D²/4
v = velocity ( 2 - 4) m/s, we use = 3 m/s
Q = A x v
= π x dH2
/ 4 x v
dH =
= ((0.08 x 4)/3,14 x 4))^0.5
= 0.12 m
= 116 mm
= 4.6 inch
Then for Ballast main pipe, it will be use carbon steel galvanized pipe according to JIS Japan Sizes JIS G3452 / G3454 :
Nominal Diameter 125A
Inside diameter 5.1 inch 130.8 mm
Thickness 0.17717 inch 4.5 mm
Outside diameter 5.50394 inch 139.8 mm
f. Calculation of ballast pump
1) Calculation installation in E/R
Head static (Hs) = T + 0.75
Hs = 6.2 m
Head pressure (Hp) = (Pdis - Psuc)/γ
Hp = 1 atm - 1 atm
= 0 m
2) Calculationof head losses in suction pipe
Major losses :
Re = ( D x V ) / υ
Head due to frictionin the suction pipe
Where:
υ = 0.822 on 30o
C = 0.00000082 m2
/s
dH = 130.8 mm
V = 3.0 m/s
Then:
Rn = (dH x V) / υ
= (229,4x2)/0.00000082
= 477,372 if Re <2300,"laminer"
= turbulen if Re >2300,"turbulen"
Major losses = λ x L x v^2 / (D x 2g)
Where:
λ = 0,02+0,0005/D
= 0.02+0.0005/0,229
= 0.0238
L = 110 m
V = 3 m/s
D = 130.8 mm
Then:
hf = λ x L x v2
/ ( D x 2g)
= 0.0224 x 110 x 22
/ (229,4/1000) x 2 x 9.8)
= 9.20 m
Minor losses (head because of the accessories that exist on the pipe)
No Type N k n x k
1 Elbow 90o 2 0.75 1.5
2 ButterflyValve 1 0.6 0.6
3 Gate Valve 4 0.6 2.4
4 T joint 4 1 4
5 Bulkhead FittingWatertight 1 0.02 0.02
6 Bulkhead FittingWatertight 1 0.02 0.02
7 Bellmountedpipe end 1 0.05 0.05
Total 8.59
Minor Losses (hl) = k total x v2
/ (2g)
= 8,59 x 2²
/ (2 x 9.8)
= 3.94 m

8. Perhitungan Instalasi Pompa Ballast`
3) Calculation of head at the discharge pipe
Major losses = λ x L x v^2 / (D x 2g)
Where:
λ = 0,02+0,0005/D
` = 0.02+0.0005/0.2294
= 0.0238
L = 15 m
V = 3 m/s
D = 130.8 mm
Then:
hf = λ x L x v2
/ ( D x 2g)
= 0.0222 x 15 x 22
/ 0.2294 x 2 x 9.8)
= 1.254 m
Minor losses (head because of the accessories that exist on the pipe)
No type N k n x k
1 Elbow 90o 2 0.75 1.5
2 Butterfly Valve 3 0.6 1.8
3 NRV 1 1.35 1.35
4 T joint 2 1 2
Total 6.65
Minor Losses (hl) = k total x v2
/ (2g)
= 6.65 x 22
/ (2 x 9.8)
= 3.05 m
f Conclusion
Total head losses (Hl) = hs + hv + hp + hf1 + hl1 + hf2 + hl2
= 9.2 + 0 + 0 + 7.56 + 3.94 + 1.031 + 3.05
= 24 m
a. Requirements for main Ballast System
Q = 115 m3
/h
H = 24 m
b) Pump spesification
Main Ballast Pump Spesification
Merk = SiLi Pump
Type of Pump = Centrifugal Pump (VSN-S-300)
Capacity (m3/h) = 135 = 442.913ft
Head (m) = 26.5 = 86.942ft
Pump's Electric motor
Type of motor = Y160L-2H
Power (kW) = 18.5
Freq (Hz) = 50 Hz
Speed = 2900 rpm
NPSH = 5.5= 18.044ft
Shaft power = 13.32
General Service Pump Spesification
Merk = SiLi Pump
Type = Y225M-2H
Capacity = 135 m3/hr
Head = 26.5 m
Frekuenzi = 50 Hz Hz
Rpm = 2900 rpm
Power = 18.5 kw
material impeller = Bronze
material shaft = Stainless steel
material casing = Cast Iron