pressure safety valve sizing calculation rev.01 apu

STD CALCULATION FOR PSV SIZING

Self Chk:________Date:________

Chkd:________ Date:_______

Apprvd:________Date:_______

PRESSURE SAFETY VALVE SIZING CALCULATIONSVAPOUR OR GAS RELIEF

17-Apr-23

Client:Job No:Project:

Tag No:Location:

PROCESS DATAVapour or Gas ReliefFluid

Relieving Scenario

Vessel Design Code

Mass Flow , W kg/h 5400 11905 lb/hr.Gas Molecular Weight, M kg/kmol 28.00Relief Temperature of Inlet Gas or Vapor, T °C 50.00 582 RCompressibility, Z 1.00Cp/Cv , k 1.40RV Set pressure bar(g) 13.00Back Pressure bar(g) 10.00 User Input for Kb (Optional).

1.00

356.06 .

% 21 Note, do not exceed defaults.

CALCULATIONS / RESULTS

psia 242.79

psia 128.26

Critical flow / Subcritical flow Subcritical FlowType of SV Balanced Bellow

0.975 Default Value as per API-520.

Calculated Orifice Area, A 0.644

Selected Orifice H Refer Table 1 of API Std. 526Selected Orifice Area 0.785Relieving Capacity of Selected PSV kg/h 6583

Preliminary PSV Size (Inlet x Outlet) 2"x 3"

Orifice Designation H

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 .

Absolute Upstream Relieving Pressure. P1

Critical backpressure , Pcr

Effective coefficient of Discharge, Kd

inch2

inch2


Self Chk:________Date:________

Chkd:________ Date:_______

Apprvd:________Date:_______


17-Apr-23

Client: ONGC URANJob No:Project: Intal. Of Centrifugal

Tag No:Location: Vessel

PROCESS DATAVapour or Gas ReliefFluid Compressed Air

Relieving Scenario

Vessel Design Code

Mass Flow , W kg/h 6570 14454 lb/hr.Gas Molecular Weight, M kg/kmol 29.96Relief Temperature of Inlet Gas or Vapor, T °C 75.73 628.31 RCompressibility, Z Z 1.00Cp/Cv , k k 1.40RV Set pressure psi(g) 128.01

psi(g) 0.00 User Input for Kb (Optional).

1.00

356.06 .



psia 169.59

psia 89.59

Critical flow / Subcritical flow Critical FlowType of SV Conventional


Calculated Orifice Area, A 1.124 7.253 Sq.Cm

Selected Orifice J Refer Table 1 of API Std. 526Selected Orifice Area 1.287 8.303 Sq.CmRelieving Capacity of Selected PSV lb/h 16546 7520.9 kg/hr

Preliminary PSV Size (Inlet x Outlet) 2.5"X4"

Orifice Designation J

Back Pressure, P2







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inch2


Self Chk:________Date:________

Chkd:________ Date:_______

Apprvd:________Date:_______


17-Apr-23


Tag No:Location:


Relieving Scenario

Vessel Design Code

Required Flow through the device , V 93.3333333333333 93.3333333333 kg/hr.

Gas Molecular Weight, M kg/kmol 29.96Relief Temperature of Inlet Gas or Vapor, T °C 75.00 348.00 KCompressibility, Z 1.00 348Cp/Cv , k 1.400RV Set pressure kPag 883.00

kPag 0.00 User Input for Kb (Optional).

1.00

356.06 .



kPaa 1169.76

kPaa 617.96



Calculated Orifice Area, A 2.39565628892510 0.003713275

Selected Orifice L Refer Table 1 of API Std. 526Selected Orifice Area 2.853Relieving Capacity of Selected PSV Nm3/min 111 Nm3/hr. 6669.070


Orifice Designation L

BASED ON VOLUMETRIC FLOW RATE (Nm3/min)

Nm3/min

Back Pressure, P2







inch2 mm2

inch2


Self Chk:________Date:________

Chkd:________ Date:_______

Apprvd:________Date:_______

PRESSURE SAFETY VALVE SIZING CALCULATIONSFIRE CONDITION (VAPOUR OR GAS RELIEF)

(UNWETTED VESSEL) 17-Apr-23


Tag No:Location:


Relieving Scenario

Vessel Design Code

Exposed Surafce Area of Vessel, A' Sq.ft 87.610 193.15 lb/hr.PSIA 650.210

°C 50.000 582 RMax. Vessel wall Temperature °R 1760.000 (API Recommends)Cp/Cv , k 1.284RV Set pressure bar(g) 53.000

bar(g) 3.400 User Input for Kb (Optional).

345.464

F' 0.026 .

% 21.000 Note, do not exceed defaults.


psia 944.59

psia 518.23


0.975 Default Value as per API-520.R 845.493717414374 196.4 C


Selected Orifice D Refer Table 1 of API Std. 526Selected Orifice Area 0.110Relieving Capacity of Selected PSV kg/h 129


Orifice Designation D

Normal Operating Pressure, Pn

Normal Operating Temperature, Tn

Back Pressure, P2






Gas Temperature at Upstream Pressure, T1

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inch2


Self Chk:________Date:________

Chkd:________ Date:_______

Apprvd:________Date:_______

PRESSURE SAFETY VALVE SIZING CALCULATIONSFIRE CONDITION (VAPOUR OR GAS RELIEF)

(WETTED VESSEL) 17-Apr-23


Tag No:Location:


Relieving Scenario

Vessel Design Code

Mass Flow , W kg/h 1024 2257.5 lb/hr.Gas Molecular Weight, M kg/kmol 28.00Relief Temperature of Inlet Gas or Vapor, T °C 147.00 756.6 RCompressibility, Z 1.00Cp/Cv , k 1.40RV Set pressure bar(g) 11.00

bar(g) 0.00 User Input for Kb (Optional).

1.00

356.06 .



psia 207.69

psia 109.72




Selected Orifice E Refer Table 1 of API Std. 526Selected Orifice Area 0.196Relieving Capacity of Selected PSV kg/h 1233


Orifice Designation E

Back Pressure, P2







inch2

inch2

Vessel diameter, D 15 feetVessel end-to-end length L 30 feet

Vessel elevation H 15 feetLiquid depth in vessel F 12.25 feet

Total Height of Liquid surface 27.25 feet

K 25 feet

Initial Liquid Level 10 feetEffective Liquid Level E 10 feet

Effective Liquid Level angle B 109.4712206 degrees

Vertical Cylinder with spherical ends:471.238898 sq.ft

Vertical Cylinder with flat ends:647.9534848 sq.ft

Horizontal Cylinder with flat ends:1075.89566 sq.ft

Horizontal Cylinder with spherical ends:901.1313762 sq.ft

Wetted Surface Area, Awet in square feet:

Calculation fo Effective Liquid Level, E

K1

Effective total height of Liquid surface

E1

Awet

Awet

Awet

Awet

6E-17

#NAME?

#NUM!

-0.33333333333

1.907099901949

0.98593088656

PROJ No:_________CALC No:_________

Self Chk:________Date:________

Chkd:________ Apprvd:________Date:_______ Date:_______

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

RELIEF VALVE SIZING CALCULATIONSLIQUID RELIEF

Client: Software validationJob No: PEL-BMS-CAL-P-0304Project: Liquid service

Tag No: 20-PSV-011Location TEST SEPARATOR (V-2005)

PROCESS DATALiquid relief

Relieving Scenario Blocked outlet

Vessel Design CodeMass Flow kg/h 515.00Density at flowing conditions kg/m³ 1130.00Absolute Viscosity at FC cP 3.49RV Set pressure Ps bar(g) 1812.50Back Pressure Pb bar(g) 4.60 User Input for accumulation (Optional)

Accumulation % 10.00CALCULATIONS / RESULTSUpstream Relieving Pressure psig 28909.38% of guage backpressure (Pb/Ps)x100 0.25Back Pressure Correction Factor Kw Based on API 520 Fig.35 1.00Viscosity Correction Factor Kv Based on API 520 Fig.36 0.96 User Input for accumulation (Optional)

0.65

Type of RV ConventionalCalculated Orifice Area 0.001Selected Orifice DSelected Orifice Area 0.110Relieving Capacity of Selected RV kg/h 107076

Preliminary RV Size (Inlet x Outlet) 1"x 2"

Orifice Designation D

Effective coefficient of Discharge Kd (API-520 default=0.65)

inch2

inch2


Self Chk:________Date:________

Chkd:________ Date:_______

Apprvd:________Date:_______

PRESSURE SAFETY VALVE SIZING CALCULATIONSLIQUID RELIEF

17-Apr-23

Client: RelianceJob No:Project: Well head Manifold

Tag No:Location:

PROCESS DATAVapour or Gas ReliefFluid Produced Water

Relieving Scenario Blocked Outlet

Vessel Design Code

Flow Rate, Q 13.24 220.67 Litres/min

Relief Temperature of Inlet Gas or Vapor, T °C 45.00 573 RSpecific Gravity of Liquid, G 1.00Viscosity , cP 0.50RV Set pressure kPa(g) 493.00

kPa(g) 70.00 User Input for Kb (Optional).

1.00

0.88 .

% 10 10.2 Note, do not exceed defaults.


psia 543.29

psia 407.46



Selected Orifice F Refer Table 1 of API Std. 526Selected Orifice Area 0.307

Relieving Capacity of Selected PSV 19

Preliminary PSV Size (Inlet x Outlet) 1.5"x 2"

Orifice Designation F

m3/hr

Back Pressure, P2

Back Pressure Correction Factor Kw (Default value = 1)

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





inch2

inch2

m3/hr

pressure safety valve sizing calculation rev.01 apu

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