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