Pressure Safety Valve Sizing Calculation Rev.01 APU [PDF]

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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:_______