BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
DATE
SIGNATURE
COSIGN DISCIPLINE
JOB NO. 2012BD-004
MAJOR MACHINERY EQUIPMENT CALCULATION
CNOOC RI SIGNATORY
APPROVED
SIGNATURE
DATE
REV’W EXAM. APPR.
Page 1 of 17
(O) B REV.
2012.8 ISSUED FOR REVIEW 2012.6 ISSUED FOR COMMENTS DATE DESCRIPTION
BY
CH ‘K. REV’ W. EXAM. APPR.
CLIENT
Marine Design & Research Institute of China
CNOOC Ltd. Shenzhen
MAJOR MACHINERY DESIGN CERTIF. NO .
CNOOC Research Institute A111008717 MARIC 091034-sj
EQUIPMENT CALCULATION (CN-USP-SCS(E)-EP24-2)
DOCUMENT NO. BD-CAL-FPSO(HULL)-014-002 MARIC Doc. No.: M40218-014-002JS
REV.
(O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
BD-CAL-FPSO(HULL)-014-002 REV. (O)
INDEX 1.0
Bilge system ........................................................................................................3
2.0
Fire fighting system ............................................................................................5
3.0
The ballast system ..............................................................................................7
4.0
Compressed air system .....................................................................................9
5.0
Inert gas system................................................................................................11
6.0
Fuel oil system ..................................................................................................12
7.0
The seawater system ........................................................................................16
Major Machinery Equipment Calculation MARIC Doc. No.: M40218-014-002JS
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BD-CAL-FPSO(HULL)-014-002 REV. (O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
1.0 1.1
Bilge system The min. Internal diameter of branch bilge line for machinery room : According to BV rules of offshore units: db1=2.16 L1 ( B + C ) +25 mm db1 ――The min. Internal diameter of branch bilge line mm; L1 ――The length of the machinery room m ; B ――The width of the ship m; C ――The depth of the ship m; db1=2.16 20 (48.9 + 26.7) +25 = 108.99 mm Selected diameter of branch bilge line:
1.2
Φ140 x 9.5 mm.
The min. Internal diameter of main bilge line for machinery room : According to BV rules of offshore units: The cross-section area of the main bilge line is not to be less than twice the cross-section area of the machinery space. dm =
2 db1 =
2 x 108.99 = 154.2
mm
dm――min. Internal diameter of main bilge line Selected diameter of main bilge line: 1.3
mm
Φ219 x 12.7 mm.
The capacity of bilge pump for machinery room: According to BV rules of offshore units: The capacity of each pump or group pumps is not to be less than that required by the following formula: 3 Q m = 0 . 00565 × d m2 = 134.4 m /h
1.4
1.5
Qm ――The capacity of bilge pump for machinery room
m3/h;
Selected bilge ballast & G. S. Pump in machinery room
2 sets
3
Capacity:
150 m /h
Pressure:
0.4 MPa
Type:
Vertical, Centrifugal, with self-priming device
Bilge daily pump( in machinery room ):
1 set
3
Capacity:
5
m /h
Pressure:
0.4 MPa
Type:
Piston pump
The min. internal diameter of branch bilge line for void tank of STP area: According to BV rules of offshore units: db3 = 2.16 L3 ( B + C ) +25
Major Machinery Equipment Calculation MARIC Doc. No.: M40218-014-002JS
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BD-CAL-FPSO(HULL)-014-002 REV. (O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
= 2.16 17.6 (48.9 + 26.7) +25=103.79 mm Selected diameter of branch bilge line: 1.6
Φ140 X 9.5 mm
The min. internal diameter of main bilge line for STP area void tank: According to BV rules of offshore units: dv= 2 db3=146.78 mm Selected diameter of main bilge line:
1.7
Φ168 X 11 mm
The capacity of bilge ejector for void space around STP According to BV rules of offshore units: Qv=0.00565 x db32 = 121.73 m3/h Selected bilge ejector of void tank:
1 set
3
Capacity: ~130m /h 1.8
The min. internal diameter of bilge line for void space between machinery room and cargo oil tank: According to BV rules of offshore units: ds=2.16 L2 ( B + C ) +25
mm
ds ――The min. Internal diameter of branch bilge line mm; L2 ――The length of the void space m; B ――The width of the ship m; C ――The depth of the ship m; ds=2.16 2.4 (48.9 + 26.7) +25 = 54.1 mm Selected diameter of bilge line: Φ76 X 9.5 mm 1.9
The capacity of bilge ejector for chain locker: According to BV rules of offshore units: Qv=0.00565 X ds2 = 16.54 m3/h Selected bilge ejector of void tank between machinery room and cargo oil tank: 1 set
1.10
Capacity:
20 m3/h
Total head:
~35 mlc
Selected bilge ejector of chain locker:
1 set 3
Capacity:
20 m /h
Total head:
~35 mlc
Major Machinery Equipment Calculation MARIC Doc. No.: M40218-014-002JS
Page 4 of 17
BD-CAL-FPSO(HULL)-014-002 REV. (O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
2.0
Fire fighting system
2.1
The capacity calculation of fire pump:
2.1.1
According to BV rules of offshore units: capacity of the bilge pumps. Qf =
The capacity is not less then 2/3 of the total
2 2 Qm = x (134.4 x 2) = 179.2 m3/h 3 3
2.1.2
According to BV rules of offshore units，the water supply volume for the Max. requirement of deck foam fire fighting system (Q’) to be about 368 m3 /h.
2.1.3
The largest protective water spray for process plant (Q’’) to be about 740 m3 /h. So, Qh= Q’+Q’’ =368+740 =1108m3/h
2.1.4
The water supply volume of the largest water spray unit for process plant: According to CNOOC requirements: Qp=1200
2.1.5
m3 /h
The max. quantity of water for fire-fighting Q = 1200 m3/h
2.2
2.3
2.4
Selected electric fire pump( in machinery room ): Capacity:
680
m3/h
Pressure:
1.3
MPa
Type:
Vertical, single stage, centrifugal pump
Selected diesel engine driven fire pump (on main deck ):
2sets
1set
3
m /h
Capacity:
1200
Pressure:
1.3
Type:
Diesel engine driven, deep well type centrifugal pump
MPa
Selected jockey pump (in machinery room ):
1 set
3
Capacity:
36
m /h
Pressure:
1.3
MPa
Type:
Horizontal, centrifugal, self-priming
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BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
2.5
BD-CAL-FPSO(HULL)-014-002 REV. (O)
Selected fire water hydrophore (in machinery room ): 1 set Capacity:
5 m3 (in gross volume)
Pressure:
1.3 MPa
Type:
Pneumatic pressure tank
Major Machinery Equipment Calculation MARIC Doc. No.: M40218-014-002JS
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BD-CAL-FPSO(HULL)-014-002 REV. (O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
3.0
Ballast system
3.1
Segregated ballast system:
3.1.1
The ballast time calculation: The capacity of segregated ballast tanks & F.P.T shall be about 58289.4m3, and two segregated ballast pumps starts simultaneously. Discharging time of ballast tanks T1:
G Z × Q ×η
T1 =
T1 ――
discharging time;
G ――
capacity of special ballast tanks & F.P.T;
~58289.4 m3
Z ――
quantity of ballast pump;
2 sets
Q ――
capacity of each ballast pump;
1700 m3/h
η――
tolerance coefficient;
0.85
T1 = 3.1.2
3.1.3
h h
58289.4 = ~ 20 h 2 x 1700 x 0.85
Selected special ballast pumps (in pump room): 2 sets m3/h
Capacity:
1700
Total head:
35 mlc
Type:
Hydraulically driven submerged centrifugal
Selected water ballast eductor:
2 set 3
Capacity:
~ 200 m /h
Total Head:
~ 35 mlc
3.2
A.P.T. ballast system:
3.2.1
Discharging time of A.P.T T2: T2=
G Z × Q ×η
h
T2 ――
discharging time;
h
G ――
volume of A.P.T;
~7706.4 m3
Z ――
quantity of bilge ballast & G.S. pump;
Q ――
capacity of each bilge ballast & G.S. pump; 150 m3/h
η ――
tolerance coefficient;
Major Machinery Equipment Calculation MARIC Doc. No.: M40218-014-002JS
2 sets 0.85 Page 7 of 17
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
T2=
3.2.2
BD-CAL-FPSO(HULL)-014-002 REV. (O)
7706 .4 = 30 h 2 × 150 × 0.85
Selected bilge ballast & G.S. pump(in machine room):
2 sets
Capacity:
150/90 m3/h
Pressure:
0.4/0.8 MPa
Type:
Vertical, centrifugal, with self-priming device
Major Machinery Equipment Calculation MARIC Doc. No.: M40218-014-002JS
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BD-CAL-FPSO(HULL)-014-002 REV. (O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
4.0 4.1
Compressed air system Consumption of instrument air Vs: Instrument air consumption for process plant V1: V1= 300
m3 /h
(Provided by CNOOC)
Instrument air consumption for marine equipment V2: For pneumatic valve of heating system:
~ 10 m3/h
For IGG
~22 m3/h
For other system:
~50 m3/h
V2 = 10++22+50 = 82 m3/h m3/h
Therefore: Vs = (V1 + V2) /η= (300 + 82)/ 0.87 = 440 Vs ―― Total instrument air consumption;
m3/h
V1 ―― Instrument air consumption for process plant;
m3/h
V2 ―― Instrument air consumption for marine equipment; m3/h η ―― Efficiency of air consumption for dryer. 4.2
Consumption of utility air Vu: Consumption of utility air for process plant
V3:
~ 160 m3/h
Consumption of utility air for marine equipment V4: m3/h
Vu = V3 + V4 = 160 + 100 = 260 4.3
~ 100 m3/h
Total capacity of air consumption Va: Va= Vs+Vu = 440 +260 = 700 m3/h
4.4
Capacity of air compressor Vo: Vo = Va x m = 700 x 1.245 = 871.5 m3/h Vo ―― capacity of air compressor ;
m3/h
Va ―― total capacity of air consumption;
m3/h
m ―― coefficient of correction for environmental condition , 1.245 4.5
Selected instrument & service air compressor: Capacity:
880 m /h
Discharge pressure:
1.2 MPa
Type: 4.6
2 sets
3
air cooled, screw type
Selected instrument air dryer:
Major Machinery Equipment Calculation MARIC Doc. No.: M40218-014-002JS
1sets Page 9 of 17
BD-CAL-FPSO(HULL)-014-002 REV. (O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
Capacity:
600 m3/h
Working pressure:
1.2 MPa
Type: Heatless desiccant Twin-Tower Dew point:
-23℃
Particle diameter:
<3µ
Maximum relative humidity: 100% 4.7
Selected instrument air reservoir:
1 set
Capacity:
10 m3
Working pressure:
1.2 MPa
Note: the capacity could maintain 10 minutes for emergency operation of topside instrument. (to be confirmed by CNOOC) 4.8
Selected service air reservior: Capacity: Working pressure:
Major Machinery Equipment Calculation MARIC Doc. No.: M40218-014-002JS
2 sets 3
5m
1.2 MPa
Page 10 of 17
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
5.0
BD-CAL-FPSO(HULL)-014-002 REV. (O)
Inert gas system The volume calculation for inert gas consumption （hull part）: According to SOLAS and relative classification rules, the inert gas system shall be capable of delivering inert gas to the cargo tanks at a rate of at least 125% of the maximum rate of discharge capacity of the ship expressed as a volume. In cargo oil offloading mode, the maximum rate should be consisted of six(6) sets cargo oil pumps , One(1) slop pump, one(1) process water pump and one(1) C.O. settling tank transfer pump at the same time. According to discharge capacity of the pumps mentioned above: Q1
= 1.25×(Qc x6 + Qs x1 +Qp x1 +Qt x1) = 1.25×（6×900＋400＋300＋15） = 7643.75 m3/h
Q1
――
supplied inert gas quantity for COT at offloading condition;
Qc
――
capacity of each cargo oil pumps at offloading condition;
Qs
――
capacity of slop pump at offloading condition; ~400 m3/h
Qp
――
capacity of process water pump at offloading condition;
Qt
――
capacity of C.O. settling tank transfer pump;
m3/h , 900m3/h
~300m3/h
~15m3/h
Note: the total consumption of inert gas system should include the amount consumed by topside; and should be provided by CNOOC.
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BD-CAL-FPSO(HULL)-014-002 REV. (O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
6.0 Fuel oil system Basic formula of oil consumption for equipment: Q=Zx or
gx
Nx
Q=Zx
qx
10 – 6
Tx
(t)
10 – 6
Tx
(t)
Q ―― the quantity of consumption for this equipment
(t)
Z ―― quantity of equipment g ―― specific fuel oil consumption rate q ―― fuel oil consumption rate
(g/h)
N ―― rated output of equipment T ―― service time 6.1
( g / kW h ) ( kW )
( h ) (self-sustained running time:
504h )
Calculation of fuel oil consumption : The quantity of storage oil shall be according to calculation for twenty-one (21) days.
6.1.1
Fuel oil consumption for generator sets: Q1 = q1 x T1
(t)
q1－ oil consumption under cargo oil offloading;
6 x 1820
l/h
(according to submitted by CNOOC) According to requirement of CNOOC, the MDO used for engine starting and before stopping. (to be confirmed by CNOOC) T1－the time of using MDO
~40 h
Q1 = 6 x 1820 x 40 x 10 – 3 = 436.8 ( m3 ) 6.1.2
Fuel oil consumption for emergency generator set: Q2 = Z x
Tx
10 – 3
(t)
Z － quantity of equipment;
1set
g － fuel oil consumption rate;
~340kg / h
T － service time;
24 ( h )
Q2 = 1 x 6.1.3
qx
340 x
24 x
10-3 /0.84 = 9.72
(m3)
Fuel oil consumption for diesel engine of emergency fire pump: Q3 = Z x
qx
Tx
10 – 6
(t)
Z － quantity of equipment;
1set
q － fuel oil consumption rate;
(165) l/ h
N － rated output of equipment;
360 kW
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BD-CAL-FPSO(HULL)-014-002 REV. (O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
T － service time; Q3 = 1 x 165x 6.1.4
18 x
18 ( h ) 10 – 3 = 2.97 m3
Fuel oil consumption for thermal oil boiler: Q4 = q x T x n
(t)
q1 － consumption of thermal oil boiler under normal loading; n
1500
l/h
－ number of running boiler, 3 for re-starup after typhoon retreat
According to requirement of CNOOC, the MDO only used for boiler starting and before stopping. T － service time;
~40 h m3
Q4 = 1.5 x 40 x 3 = 180 6.1.5
Fuel oil consumption for I.G.G. units: Q5 = q1 x
Gx
T/
(t)
q1 － fuel oil consumption for producing one I.G. ; kg/m3
q1 ≈ 0.074
(8000 m3/h)
G － requirement quantity of I.G. ; T1 － The time of offloading; Q4 = 0.074 x 8000 x 72 / 840 = 50.7 6.1.6
~72
h
3
m
Total fuel oil consumption: Q = Q1 + Q2 + Q3 + Q4 = 436.8 + 9.72+ 2.97 + 180 + 50.7 = 680.2
m3
There are three D.O.T. on board, total volume is ~1398 m3 , one cleaning D.O.T. is 170.7 m3 , and one D. O. overflow tank is 99 m3 . Totally more than 1500m3. So it is enough. 6.2
The calculation of diesel oil tank volume: Basic formula of diesel oil service tank:
V=
g xT
γ
xk
m3
g － fuel oil consumption for per hour;
kg/h
T － time of continuous service;
h
γ － fuel oil specific gravity;
840 kg/ m3
k － coefficient.
1.1
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BD-CAL-FPSO(HULL)-014-002 REV. (O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
6.2.1
The volume of fuel oil service tank for emergency generator set: q = 340
kg/h
T = 24
h
V2 = 340 (kg /h ) x
24(h) x
1.1 / 840(kg/ m3) = 10.7
m3
Selected volume of fuel oil service tank for emergency generator set: ~17 m3 1set 6.2.2
The volume of fuel oil service tank for emergency fire pump: q = 165 T = 18
l/h h
V3 = 165 (l/h ) x
18(h ) x
According to NFPA20:
1.1 /1000
= 3.3 m3
V3’=Nx 5.07 l/kWx (1+5%+5%) =649x 5.07 l/kWx (1+5%+5%) =3.62 m3
Selected volume of fuel oil service tank for emergency fire pump: ~5.2 m3 6.2.3
Selected cleaning D.O.T : Capacity:
170.7
1 set
1 set
3
m
6.3
Diesel oil pump & D.O. separator:
6.3.1
The capacity of diesel fuel transfer pump: Q = V1-2 /T = 35 / 2.5 = 14 m3/ h T － Filling time (to finish filling by two pumps within 2.5 hours);
h
V1-2－ The selected volume of MDO service tank for generator sets; m3 provided by CNOOC) 6.3.2
The capacity of transfer pump for emergency service tanks
(to
be
2 sets
3
Q = ( V2 + V3 )/T = (17 + 5.2 )/2 = 11.1 m /h T － Filling time;
h
V2－ The selected volume of fuel oil service tank for emergency generator set. V3－ The selected volume of fuel oil service tank for emergency fire pump. 6.3.3
Selected diesel oil transfer pump: Capacity:
20 m3/h
Pressure:
0.65 MPa
Type:
Horizontal gear pump
Major Machinery Equipment Calculation MARIC Doc. No.: M40218-014-002JS
2 sets
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BD-CAL-FPSO(HULL)-014-002 REV. (O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
6.3.4
Diesel oil separator: Total volume of fuel oil consumption:Q = q1+q4 q1 － Volume of fuel oil consumption for generator sets; q1 = 1820 x 2 (l/h) x 10-3 = 3.64
m3/h
m3/h
q4 － Volume of fuel oil consumption for thermal oil boiler; q4 = 1500 (l/h) x 1 x 10-3 = 1.5
m3/h
m3/h
Q = 3.64+ 1.5= 5.14 m3/h = 5140 l /h Required capacity:
Q’ = Q x a x 24 / t
a － coefficient;
a = 1.18
t － effective service time; Q’ = 5140 (l/h) x
1.18 x
24 / 24 = 6065
Selected diesel oil separator: Effective capacity: Type:
for partial discharge t = 24 h l/h
1 set 7100
l/h
Self-cleaning, partial discharge
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BD-CAL-FPSO(HULL)-014-002 REV. (O)
BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
7.0 7.1
The seawater system Capacity of center seawater system: ~840m 3 /h
Cooling seawater capacity for process unit Q1: Cooling seawater capacity for HVAC of topside unit
Q1’:
~100 m3/h ~1980 m 3 /h
Cooling seawater capacity for main generators Q2: Cooling seawater capacity for main inert gas generator unit Q3:
~600 m3/h ~18 m 3 /h
Cooling seawater capacity for SPT HPU Q5: Cooling seawater capacity for air conditioning compressor Q6:
~150 m3/h x2 ~65 m 3 /h
Cooling seawater capacity for air condition (control space) Q7: Cooling seawater capacity for refrigerating compressors Q8:
~8 m 3 /h
Cooling seawater capacity for air conditioner of No.1 machinery workshop Q9:
~4.4 m3/h
Cooling seawater capacity for air conditioner of No.2 machinery workshop Q10:
~4.4 m3/h
Seawater capacity for fresh water generator Q11:
~16 m3/h
Seawater capacity for anti-fouling system Q12:
~20 m3/h
Cooling SW capacity for fore deck machinery hydr. Oil cooler Q13:
~5 m 3 /h
Cooling SW capacity for aft. deck machinery hydr. Oil cooler Q14: Cooling SW capacity for stern off-loadind system’s HPU cooler Q15: Cooling SW capacity for cargo oil pump HPU cooler Q16:
~13
m3/h
~ 13 m 3 /h ~185m3/h x2
The max. Supply capacity: Qmax.= Q1+ Q1’+ Q2+ Q3+ Q5+ Q6+ Q7+ Q8+ Q9+ Q10+ Q11+ Q12+ Q13+Q14+Q15+Q15+Q16 = 4356.8 m3/h In emergency case, the seawater capacity as follows: QE.= Q6+ Q7+ Q8+ Q12= 393 m3/h 7.2
7.3
Main sea water pump:
6 sets (one for stand-by)
Capacity:
~950 m3/h
Pressure:
0.8 MPa
Type:
vertical, single stage, centrifugal
Aux. Sea water pump
1 sets
Capacity:
420 m3/h
Pressure:
0.6 MPa
Type:
vertical, single stage, centrifugal
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BASIC DESIGN OF EP24-2 OFFSHORE OIL FIELD DEVELOPMENT
7.4
Deck water seal pump for I.G.G
BD-CAL-FPSO(HULL)-014-002 REV. (O)
2 sets
3
Capacity:
~6 m /h
Pressure:
50mlc
Type:
horizontal, single stage, centrifugal
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