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REV. NO DATE PREP'D CHK'D
K02 19-Jul-10 NP SCJ
K03 21-Jun-11 JOA SCJ
L01 24-Oct-11 JOA SCJ
L02 14-Feb-13 RAU KSJ
L03 13-Mar-13 RAU YA
Project : DSO Offshore Unit : NWP
CNL Sheet : 1 OF 3
Service : Vent KO Drum Liquid Pump Item No. : PSV-0764 C/D
1
2 1. Objective
3 Identify reliving contingencies and determine relieving flowrate of Pressure Relief Valve PSV-0764 C/D
4
5 2. Reference P&ID
6 SOM-NWP1-PRO-PID-HHI-0000-00020-02
7
8 3. Equipment Protected :
9 Vent K/O Drum Liquid Pump, 176-PBB-0764 A/B
10
11 4. Equipment Design Pressure :
12 324.1 barg
13 5. PSV Set Pressure
14 124.1 barg
15 6. Reliving Contingencies
16
17 No. Case Flowrate(kg/hr) Remarks
18 A Fire (Wetted Surface Area) N/A
19 B Fire (Unwetted Surface Area) N/A
20 C Blocked Discharge Yes 10200 (Note 1)
21 D Reflux Failure N/A
22 E Check Valve Malfunction N/A
23 F Tube Rupture N/A
24 G Control Valve Failure N/A
25 H Power Failure N/A
26 I Gas Blowby N/A
27 J Loss of air or gas instrument N/A
28 K Loss of cooling N/A
29 L Excessive heat input N/A
30
31
32 Notes. 1. The calculated orifice size of water case is bigger than the size of oil case.
33 Therefore the sizing case is Water case.
34 2. PSV type : Conventional
35
36
37
38
39
40
41
42
43
44
CALCULATION SHEET FOR PRESSURE RELIEF VALVE
Client :
Applicable or not
REV. NO DATE PREP'D CHK'D
K02 19-Jul-10 NP SCJ
K03 21-Jun-11 JOA SCJ
L01 24-Oct-11 JOA SCJ
L02 14-Feb-13 RAU KSJ
L03 13-Mar-13 RAU YA
DSO Offshore Unit : NWP
Client : CNL Sheet : 2 OF 3
Service : Vent KO Drum Liquid Pump Item No. : PSV-0764 C/D
1 1. Cause of Overpressure Blocked Case (Sizing Case)
23 2. Relieving Condition
4 Fluid Viscosious (Y or N) N Water (Note 1)
5
6 Relief Temperature (T): 35 ℃
7 Set Pressure : 12,410 KPag
8 Over Pressure (%) : 10 %
9 Relief Pressure (P1) : 13,651 KPag
1011 Molecular Weight of vapor (M):
12 Density at standard condition 1,000.0
13 Required Relieving Rate (Q): 10.2
14 170.0 L/min
15 10,200 kg/hr
16 Back Pressure (P2 ) : 100.0 Kpag
17 Viscosity 0.73 cP
18 Correction Factor due to Viscosity(Kv) 1.0000 (for nonviscosious)
19 (Figure 36) #VALUE! (for viscosious) 71
20 Reynolds Number ® 847,584
2122 4. Calculate required relieving area.
2324 A = 11.78*Q
25 KdKw KcKv
26 = 26.5
27 0.0410
2829 Kd = 0.65 (w/o Rup.D) Effective coefficient of discharge
30 Kw = 1 (find Kw ) 0.81% (Pb/Ps *100 Fig 31 in API 520)
31 Kc = 1 (rupture disk =0.9, others =1.0)
3233 5. Selection of Orifice Size & Type
34 The quantity of PSV to be installed : 1 SETs
35 Inlet size X Outlet size
36 Cal. 1.5 * D * 3.0 (Note 2)
373839 6. Selected Orifice Area :
40 0.110
41 70.968 mm2
4243 7. Rated Flow rate :
44 27,350 kg/hr (for nonviscosious)
45 60,297 lb/hr (for nonviscosious)
46NOTE. 1. The above property is based on Water.
2. Orifice size selected and confirmed by Vendor.
CALCULATION SHEET FOR PRESSURE RELIEF VALVE
BY API RP 520 ( Blocked- Liquid)
Project :
kg/㎥㎥/hr
√(G/P1-P2)
mm2
in2
inch2
REV. NO DATE PREP'D CHK'D
K02 19-Jul-10 NP SCJ
K03 21-Jun-11 JOA SCJ
L01 24-Oct-11 JOA SCJ
L02 14-Feb-13 RAU KSJ
L03 13-Mar-13 RAU YA
DSO Offshore Unit : NWP
Client : CNL Sheet : 3 OF 3
Service : Vent KO Drum Liquid Pump Item No. : PSV-0764 C/D
1 1. Cause of Overpressure Blocked Case
23 2. Relieving Condition
4 Fluid Viscosious (Y or N) N Oil (Note 1)
5 PFD stream
6 Relief Temperature (T): 35 ℃
7 Set Pressure : 12,410 KPag
8 Over Pressure (%) : 10 %
9 Relief Pressure (P1) : 13,651 KPag
1011 Molecular Weight of vapor (M):
12 Density at standard condition 695.0
13 Required Relieving Rate (Q): 10.2
14 170.0 L/min
15 7,089 kg/hr
16 Back Pressure (P2 ) : 100.0 Kpag
17 Viscosity 0.36 cP
18 Correction Factor due to Viscosity(Kv) 1.0000 (for nonviscosious)
19 (Figure 36) #VALUE! (for viscosious) 71
20 Reynolds Number ® 1,321,328
2122 4. Calculate required relieving area.
2324 A = 11.78*Q
25 KdKw KcKv
26 = 22.1
27 0.0342
2829 Kd = 0.65 (w/o Rup.D) Effective coefficient of discharge
30 Kw = 1 (find Kw ) 0.81% (Pb/Ps *100 Fig 31 in API 520)
31 Kc = 1 (rupture disk =0.9, others =1.0)
3233 5. Selection of Orifice Size & Type
34 The quantity of PSV to be installed : 1 SETs
35 Inlet size X Outlet size
36 Cal. 1.5 * D * 3.0 (Note 2)
3738 6. Selected Orifice Area :
39 0.110
40 70.968 mm2
4142 7. Rated Flow rate :
43 22,801 kg/hr (for nonviscosious)
44 50,268 lb/hr (for nonviscosious)
45NOTE. 1. The above property is based on Oil
2. Orifice size selected and confirmed by Vendor.
CALCULATION SHEET FOR PRESSURE RELIEF VALVE
BY API RP 520 ( Blocked- Liquid)
Project :
kg/㎥㎥/hr
√(G/P1-P2)
mm2
in2
inch2