Pressure Safety Valve Sizing Calculation Rev.01 APU

August 16, 2017 | Author: Alvin Smith | Category: Pressure, Gases, Valve, Liquids, Heat Capacity
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psv sizing...

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STD CALCULATION FOR PSV SIZING

PRESSURE SAFETY VALVE SIZING CALCULATIONS VAPOUR OR GAS RELIEF 28-Nov-13

Client: Job No: Project: Tag No: Location: PROCESS DATA Vapour or Gas Relief Fluid Relieving Scenario Vessel Design Code Mass Flow , W kg/h Gas Molecular Weight, M kg/kmol Relief Temperature of Inlet Gas or Vapor, T °C Compressibility, Z Cp/Cv , k RV Set pressure bar(g) Back Pressure bar(g) Back Pressure Correction Factor Kb (Default value = 1) Coefficient determined from an expression of the ratio of the specific heats (k = CP/Cv) , C Accumulation / Overpressure . CALCULATIONS / RESULTS Absolute Upstream Relieving Pressure. P1

5400 28.00 50.00 1.00 1.40 13.00 10.00 1.00 356.06

%

242.79

psia

128.26 Subcritical Flow Balanced Bellow 0.975

Calculated Orifice Area, A

inch2

0.644

Selected Orifice Selected Orifice Area Relieving Capacity of Selected PSV

inch2 kg/h

H 0.785 6583

Preliminary PSV Size (Inlet x Outlet) Orifice Designation

Self Chk:________ Date:________

582

R

User Input for Kb (Optional).

.

21

psia

Critical backpressure , Pcr Critical flow / Subcritical flow Type of SV Effective coefficient of Discharge, Kd

11905 lb/hr.

Note, do not exceed defaults.

Default Value as per API-520. Refer Table 1 of API Std. 526

2"x 3" H

Chkd:________ Date:_______

Apprvd:________ Date:_______

STD CALCULATION FOR PSV SIZING

PRESSURE SAFETY VALVE SIZING CALCULATIONS VAPOUR OR GAS RELIEF 28-Nov-13

Client: Job No: Project:

ONGC URAN Intal. Of Centrifugal

Tag No: Location:

Vessel

PROCESS DATA Vapour or Gas Relief Fluid Relieving Scenario

Compressed Air

Vessel Design Code Mass Flow , W kg/h Gas Molecular Weight, M kg/kmol Relief Temperature of Inlet Gas or Vapor, T °C Compressibility, Z Z Cp/Cv , k k RV Set pressure psi(g) Back Pressure, P2 psi(g) Back Pressure Correction Factor Kb (Default value = 1) Coefficient determined from an expression of the ratio of the specific heats (k = CP/Cv) , C Accumulation / Overpressure . CALCULATIONS / RESULTS Absolute Upstream Relieving Pressure. P1 Critical backpressure , Pcr Critical flow / Subcritical flow Type of SV Effective coefficient of Discharge, Kd Calculated Orifice Area, A Selected Orifice Selected Orifice Area Relieving Capacity of Selected PSV Preliminary PSV Size (Inlet x Outlet) Orifice Designation

Self Chk:________ Date:________

6570 29.96 75.73 1.00 1.40 128.01 0.00 1.00

14454 lb/hr. 628.31 R

User Input for Kb (Optional).

356.06 %

.

21

Note, do not exceed defaults.

psia

169.59

psia

89.59 Critical Flow Conventional 0.975

inch2

1.124

7.253

inch2 lb/h

J 1.287 16546

Refer Table 1 of API Std. 526 8.303 Sq.Cm 7520.9 kg/hr

Default Value as per API-520. Sq.Cm

2.5"X4" J

Chkd:________ Date:_______

Apprvd:________ Date:_______

STD CALCULATION FOR PSV SIZING

PRESSURE SAFETY VALVE SIZING CALCULATIONS VAPOUR OR GAS RELIEF 3

B ASED ON VOLUMETRIC FLOW RATE (Nm /m in)

28-Nov-13

Client: Job No: Project: Tag No: Location: PROCESS DATA Vapour or Gas Relief Fluid Relieving Scenario Vessel Design Code Required Flow through the device , V Nm3/min Gas Molecular Weight, M kg/kmol Relief Temperature of Inlet Gas or Vapor, T °C Compressibility, Z Cp/Cv , k RV Set pressure kPag Back Pressure, P2 kPag Back Pressure Correction Factor Kb (Default value = 1) Coefficient determined from an expression of the ratio of the specific heats (k = CP/Cv) , C Accumulation / Overpressure . CALCULATIONS / RESULTS Absolute Upstream Relieving Pressure. P1

93.33333333 29.96 75.00 1.00 1.400 883.00 0.00 1.00

%

1169.76

kPaa

617.96 Critical Flow Conventional 0.975

Calculated Orifice Area, A

inch2

2.39565628892510

Self Chk:________ Date:________

inch2 Nm3/min

kg/hr. K 348

User Input for Kb (Optional).

.

21

kPaa

Preliminary PSV Size (Inlet x Outlet) Orifice Designation

348.00

356.06

Critical backpressure , Pcr Critical flow / Subcritical flow Type of SV Effective coefficient of Discharge, Kd Selected Orifice Selected Orifice Area Relieving Capacity of Selected PSV

93.33333333

L 2.853 111

Note, do not exceed defaults.

Default Value as per API-520. mm2

0.003713275

Refer Table 1 of API Std. 526 Nm3/hr.

6669.070

4"x 6" L

Chkd:________ Date:_______

Apprvd:________ Date:_______

STD CALCULATION FOR PSV SIZING

PRESSURE SAFETY VALVE SIZING CALCULATIONS FIRE CONDITION (VAPOUR OR GAS RELIEF) (UNWETTED VESSEL)

28-Nov-13

Client: Job No: Project: Tag No: Location: PROCESS DATA Vapour or Gas Relief Fluid Relieving Scenario Vessel Design Code Exposed Surafce Area of Vessel, A' Normal Operating Pressure, Pn Normal Operating Temperature, Tn Max. Vessel wall Temperature Cp/Cv , k RV Set pressure Back Pressure, P2

Sq.ft PSIA °C °R bar(g) bar(g)

Coefficient determined from an expression of the ratio of the specific heats (k = CP/Cv) , C

CALCULATIONS / RESULTS Absolute Upstream Relieving Pressure. P1 Critical backpressure , Pcr Critical flow / Subcritical flow Type of SV Effective coefficient of Discharge, Kd Gas Temperature at Upstream Pressure, T1

0.026 %

21.000

psia

944.59

psia

518.23 Critical Flow Conventional 0.975 845.4937174

R

Calculated Orifice Area, A

inch2

0.075

Selected Orifice Selected Orifice Area Relieving Capacity of Selected PSV

inch2 kg/h

D 0.110 129

Preliminary PSV Size (Inlet x Outlet) Orifice Designation

Self Chk:________ Date:________

193.15 lb/hr. 582 R (API Recommends)

User Input for Kb (Optional).

345.464

F' Accumulation / Overpressure .

87.610 650.210 50.000 1760.000 1.284 53.000 3.400

.

Note, do not exceed defaults.

Default Value as per API-520. 196.4 C Refer Table 1 of API Std. 526

1"x 2" D

Chkd:________ Date:_______

Apprvd:________ Date:_______

STD CALCULATION FOR PSV SIZING

PRESSURE SAFETY VALVE SIZING CALCULATIONS FIRE CONDITION (VAPOUR OR GAS RELIEF) (WETTED VESSEL)

28-Nov-13

Client: Job No: Project: Tag No: Location: PROCESS DATA Vapour or Gas Relief Fluid Relieving Scenario Vessel Design Code Mass Flow , W kg/h Gas Molecular Weight, M kg/kmol Relief Temperature of Inlet Gas or Vapor, T °C Compressibility, Z Cp/Cv , k RV Set pressure bar(g) Back Pressure, P2 bar(g) Back Pressure Correction Factor Kb (Default value = 1) Coefficient determined from an expression of the ratio of the specific heats (k = CP/Cv) , C Accumulation / Overpressure . CALCULATIONS / RESULTS Absolute Upstream Relieving Pressure. P1

1024 28.00 147.00 1.00 1.40 11.00 0.00 1.00 356.06

%

207.70

psia

109.72 Critical Flow Conventional 0.975

Calculated Orifice Area, A

inch2

0.163

Selected Orifice Selected Orifice Area Relieving Capacity of Selected PSV

inch2 kg/h

E 0.196 1233

Preliminary PSV Size (Inlet x Outlet) Orifice Designation

Self Chk:________ Date:________

756.6 R

User Input for Kb (Optional).

.

21

psia

Critical backpressure , Pcr Critical flow / Subcritical flow Type of SV Effective coefficient of Discharge, Kd

2257.5 lb/hr.

Note, do not exceed defaults.

Default Value as per API-520. Refer Table 1 of API Std. 526

1"x 2" E

Chkd:________ Date:_______

Apprvd:________ Date:_______

Wetted Surface Area, Awet in square feet: Vessel diameter, Vessel end-to-end length

D L

15 30

Calculation fo Effective Liquid Level, E H 15 Vessel elevation F 12.25 Liquid depth in vessel Total Height of Liquid K1 27.25 surface Effective total height of K 25 Liquid surface E1 10 Initial Liquid Level E 10 Effective Liquid Level Effective Liquid Level B 109.47122 angle

feet feet

feet feet feet feet feet feet degrees

Vertical Cylinder with spherical ends: Awet 471.2389 sq.ft

Vertical Cylinder with flat ends: Awet

647.95348 sq.ft

Horizontal Cylinder with flat ends: Awet

1075.8957 sq.ft

Horizontal Cylinder with spherical ends: Awet 901.13138 sq.ft

#NUM!

6E-17 #NAME?

-0.333333333 1.907099902 0.985930887

PROJ No:_________ CALC No:_________

Self Chk:________ Date:________

Chkd:________ Apprvd:________ Date:_______ Date:_______

RELIEF VALVE SIZING CALCULATIONS LIQUID RELIEF

Client: Job No: Project:

Software validation PEL-BMS-CAL-P-0304 Liquid service

Tag No: Location

20-PSV-011 TEST SEPARATOR (V-2005)

PROCESS DATA Liquid relief Relieving Scenario

Blocked outlet

Vessel Design Code Mass Flow kg/h Density at flowing conditions kg/m³ Absolute Viscosity at FC cP RV Set pressure Ps bar(g) Back Pressure Pb bar(g) Accumulation % CALCULATIONS / RESULTS Upstream Relieving Pressure psig % of guage backpressure (Pb/Ps)x100 Back Pressure Correction Factor Kw Based on API 520 Fig.35 Based on API 520 Fig.36 Viscosity Correction Factor Kv Effective coefficient of Discharge K d (API-520 default=0.65) Type of RV inch2 Calculated Orifice Area Selected Orifice inch2 Selected Orifice Area Relieving Capacity of Selected RV kg/h

515.00 1130.00 3.49 1812.50 4.60 10.00 28909.38 0.25 1.00 0.96 0.65 Conventional 0.001 D 0.110 107076

Preliminary RV Size (Inlet x Outlet) Orifice Designation

STD CALCULATION NO: PEL-BMS-CAL-P-0300

1"x 2" D

User Input for accumulation (Optional)

User Input for accumulation (Optional)

STD CALCULATION FOR PSV SIZING

PRESSURE SAFETY VALVE SIZING CALCULATIONS LIQUID RELIEF 28-Nov-13

Client: Job No: Project:

Reliance Well head Manifold

Tag No: Location: PROCESS DATA Vapour or Gas Relief Fluid Relieving Scenario Vessel Design Code Flow Rate, Q

Produced Water Blocked Outlet m3/hr

13.24

Relief Temperature of Inlet Gas or Vapor, T °C Specific Gravity of Liquid, G Viscosity , cP RV Set pressure kPa(g) Back Pressure, P2 kPa(g) Back Pressure Correction Factor Kw (Default value = 1)

45.00 1.00 0.50 493.00 70.00 1.00

Coefficient factor due to viscosity from fig.36 (kv) , Accumulation / Overpressure .

0.88 %

10

CALCULATIONS / RESULTS Absolute Upstream Relieving Pressure. P1

psia

543.29

Critical backpressure , Pcr

psia

407.46

Effective coefficient of Discharge, Kd

0.975

Calculated Orifice Area, A

inch2

0.216

Selected Orifice Selected Orifice Area Relieving Capacity of Selected PSV

inch2 m3/hr

F 0.307 19

Preliminary PSV Size (Inlet x Outlet) Orifice Designation

Self Chk:________ Date:________

220.67 Litres/min 573

R

User Input for Kb (Optional).

.

10.2

Note, do not exceed defaults.

Default Value as per API-520. Refer Table 1 of API Std. 526

1.5"x 2" F

Chkd:________ Date:_______

Apprvd:________ Date:_______

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