psv sizing
DESCRIPTION
Based on API 520 part 1TRANSCRIPT
Kv = Cv * 0.864 Air 1.293 Zimmerli Messtechnik AG Riehen
Cv = Kv * 1.157 1.251 +41 61 645 98 00
1 bar = 14.22 PSI 1.429
1 PSI = 0.07031 bar 0.0899
1 bar = 0.1 MPa 0.717
1 MPa = 10 bar Calculation acc. to Calame a. HengstOnly for gasesOnly for low pressure regulator ZM-R, ZM-B and LPR, LPS
Quotation No:Order No:
Tag No:Tag No:Tag No:
Seat Kv = 6.500 P1 3.000
Primary pressure 3.000 bar absolute 0.000
Secondary pressure 1.000 bar absolute 0.000Differential pressure Delta p = 2.000 bar KV* is critical or too small! 1.50
Inert gas Density = 1.251Ambience/ process Temperature = 20.0 °C Kv values
Target flow Gas = 102.000 Nm3/h 6.500 Kv Seat Kv targetTheoretically Gas = 261.761 Nm3/h
Sizing Gas = 204.000 Nm3/h 5.066 Kv Sizing 261.761
Result for reducer Differential pressure sufficient for calculationLPR, ZM-R Seat and Kv sufficient, test lower Kv value, if required
Result for relief valve Differential pressure sufficient for calculationLPS, ZM-B Seat and Kv sufficient, test lower Kv value, if required
Comment:
ZM_KV_IDAG_e2, under reserve of modifications, Zimmerli Messtechnik AG, Edition: March 2010
kg/m3
N2 kg/m3
O2 kg/m3 [email protected]
H2 kg/m3
CH4 kg/m3 www.zimmerli-inert.com
www.zimmerliag.com
p1 =
p2 =
kg/m3
2nd step:If required, test a different Kv(seat) from the data sheet Rule: (Kv Seat ≥ Kv Sizing)
1st step:Enter all known application / process parameters firstKv results upon completion
Kv = Cv * 0.864 Air 1.293 Zimmerli Messtechnik AG Riehen
Cv = Kv * 1.157 1.251 +41 61 645 98 00
1 bar = 14.22 PSI 1.429
1 PSI = 0.07031 bar 0.0899
1 bar = 0.1 MPa 0.717
1 MPa = 10 bar Calculation acc. to Calame a. HengstOnly for gasesOnly for mid-range pressure regulator PR, PPR and reflux blocking valve PRR
Quotation No:Order No:
Tag No:Tag No:Tag No:
Seat Kv = 3.00 P1 4.000
Primary pressure 4.000 bar absolute 0.000
Secondary pressure 1.000 bar absolute 0.000Differential pressure Delta p = 3.000 bar KV* is critical or too small!2.00
Gas Density = 1.251Ambience/ process Temperature = 20.0 °C Kv values
Target flow Gas = 102.000 Nm3/h 3.00 Kv SeatTheoretically Gas = 161.084 Nm3/h
Sizing Gas = 128.867 Nm3/h 2.37 Kv Sizing with 20% safety161.083814169729
Differential pressure sufficient for calculationSeat and Kv sufficient, test lower Kv value, if required
Comment:
ZM_KV_IDAG_e2, under reserve of modifications, Zimmerli Messtechnik AG, Edition: March 2010
kg/m3
N2 kg/m3
O2 kg/m3 [email protected]
H2 kg/m3
CH4 kg/m3 www.zimmerli-inert.com
www.zimmerliag.com
p1 =
p2 =
kg/m3
Result for P-seriesfor gases
2nd step:If required, testa different Kv(seat) from the data sheet Rule: (Kv Seat ≥ Kv Sizing)
1st step:Enter all known application / process parameters firstKv results upon completion
Kv = Cv * 0.864 Water 1.00 Zimmerli Messtechnik AG Riehen
Cv = Kv * 1.157 Benzol 0.88 +41 61 645 98 00
1 bar = 14.22 PSI Silicone oil 0.94
1 PSI = 0.07031 bar Trichloretylene 1.47
1 bar = 0.1 MPa Flow calculation1 MPa = 10 bar acc. to Calame a. HengstOnly for liquidsOnly for mid-range pressure regulator PR, PPR and reflux blocking valve PRR
Quotation No:Order No:
Tag No:Tag No:Tag No:
Seat Kv = 9.00 P1 4.000
Primary pressure 4.000 bar absolute 0.000
Secondary pressure 1.000 bar absolute 0.000Differential pressure Delta p = 3.000 bar KV* is critical or too small!2.00
Liquid Density = 1.251Ambience/ process Temperature = 20.0 °C Kv values
Target flow Liquid = 10.000 m3/h 9.00 Kv SeatTheoretically Liquid = 13.937 m3/h
Sizing Liquid = 11.150 m3/h 8.07 Kv Sizing with 20% safety483.251442509187
Differential pressure sufficient for calculationSeat and Kv sufficient, test lower Kv value, if required
Comment:
ZM_KV_IDAG_e2, under reserve of modifications, Zimmerli Messtechnik AG, Edition: March 2010
kg/dm3
kg/dm3
kg/dm3 [email protected]
kg/dm3
www.zimmerli-inert.com
www.zimmerliag.com
p1 =
p2 =
kg/dm3
Result for P-seriesfor liquids
2nd step:If required, test a different Kv(seat) from the data sheet Rule: (Kv Seat ≥ Kv Sizing)
1st step:Enter all known application / process parameters firstKv results upon completion
Zimmerli, Inertization
Reducer type Back pressure typeSeat-ø Kv value Seat-ø Kv value
2.0 mm 0.15 18mm 6.504.5 mm 0.65
7.5 mm 1.25
2.0 mm 0.15 18 mm 6.50
4.5 mm 0.65
7.5 mm 1.2510 mm 2.00
14 mm 2.50
14 mm 3.00 26 mm 15.0018 mm 7.00
26 mm 15.00
42 mm 35.00 55 mm 70.00
55 mm 70.00
Zimmerli, pressure regulator
11 mm, Viton, EPDM 1.50 11 mm, Viton,EPDM 1.50
11 mm, HC, PTFE 1.50 11 mm, HC, PTFE 1.50
17 mm, HC, PTFE 2.80 17 mm, Viton,EPDM 2.80
17 mm, Viton,EPDM 4.80 17 mm, HC, PTFE 4.80
14 mm 3.00 14 mm 3.0018 mm 7.00 18 mm 7.0026 mm, HC, PTFE 10.00 26 mm, HC, PTFE 10.00
26 mm, Viton,EPDM 15.00 26 mm, Viton,EPDM 15.00
42 mm 35.00 42 mm 35.00
55 mm 70.00 55 mm 70.00
Zimmerli, reflux blocking valve
11 mm, Viton, EPDM 1.50
11 mm, HC, PTFE 1.50
17 mm, HC, PTFE 2.80
17 mm, Viton,EPDM 4.80
26 mm, PTFE 15.00
55 mm, PTFE 70.00
Comment:ZM_KV_IDAG_e2, under reserve of modifications, Zimmerli Messtechnik AG, Edition: March 2010
LPR25 [mbar] LPS25 [mbar]
ZM-R15 [mbar] ZM-B15 [mbar]ZM-R25 [mbar] ZM-B25 [mbar]
ZM-R50 [mbar] ZM-B50 [mbar]
ZM-R100 [mbar] ZM-B100 [mbar]
PR15 [PN40] PPR15 [PN40]
PR25 [PN40] PPR25 [PN40]
PR50 [PN16] PPR50 [PN16]
PR100 [PN16] PPR100 [PN16]
PRR15 [PN40]
PRR25 [PN40]
PRR50 [PN16]
PRR100 [PN16]
Weather effects
Temperature drop: VA [m3/h] Heating: VE [m3/h]
LPR, ZM-R LPS, ZM-B
Example: Example:
105 130.703 105 5 3 8.202
Comment:ZM_KV_IDAG_e2, under reserve of modifications, Zimmerli Messtechnik AG, Edition: March 2010
Additional shielding gas volume flow VA [m3/h], which must be supplied in case of a temperature drop. Concerns: - Outdoor tanks - without temperature insulation
Additional shielding gas volume flow VE [m3/h], which must be discharged in case of heating. Concerns: - Outdoor tanks - without temperature insulation
Important for the calculation in case of a temperature drop: - Tank discharging gradient, pump output [m3/h] - Weather factor in case of uninsulated outdoor tanks VA = 4.8*VB
0.71
VA = Volume flow in cooling (e.g. thunder storm) [m3/h] VB = Tank volume [m3] Source: TRbF120
Important for the calculation of the volume flow: - Tank filling gradient, pump output [m3/h] - Weather factor in case of uninsulated outdoor tanks VE=0.17*(H/D)-(0.52)*VB
0.89
VE = Volume flow due to warming [m3/h] VB = Tank volume [m3]
H = Tank jacket height [m] D = Tank diameter [m] Source: TRbF120
VB [m3] VA [m3/h] VB [m3] H [m] D [m] VE [m3/h]
LPR, ZM-R LPS, ZM-B
Comment:ZM_KV_IDAG_e2, under reserve of modifications, Zimmerli Messtechnik AG, Edition: March 2010
Comments concerning pressure reducing valve
Comments concerningpressure relief valve
Always choose a Kv value which is sufficiently high and, if possible, never chose the Kv value which is too low.
Always choose a Kv value which is sufficiently high and, if possible, never chose the Kv value which is too low.
Important for the calculation of the volume flow: - Tank discharge gradient, pump output [m3/h] - Weather factor in case of uninsulated outdoor tanks VA = 4.8*VB
0.71
VA = Volume flow in case of cooling (e.g. thunder storm) [m3/h]
Important for the calculation of the volume flow: - Tank filling gradient, pump output [m3/h] - Weather factor in case of uninsulated outdoor tanks VE=0.17*(H/D)-(0.52)*VB
0.89
VE = Volume flow due to warming [m3/h]
If the Kv indication states too high and the selection of the next lower Kv states too low, always select the higher Kv value.
If the Kv indication states too high and the selection of the next lower Kv states too low, always select the higher Kv value.
Attention please:The flow calculation is already designed for twice the theoretical value. Avoid further flow doubling since this might cause an unfavourable control behaviour.
Attention please:The flow calculation is already designed for twice the theoretical value. Avoid further flow doubling since this might cause an unfavourable control behaviour.
PR PPR
Starting at a pressure difference of < 3bar above the valve, the control behaviour is increasingly unlinear.The possible maximum flow quantities strongly decrease and partly amount to merely 1/10 of the calculated value. In extreme cases, the flow is even 0.
Starting at a pressure difference of < 3bar above the valve, the control behaviour is increasingly unlinear.The possible maximum flow quantities strongly decrease and partly amount to merely 1/10 of the calculated value. In extreme cases, the flow is even 0.
The flow calculation in relation to the theoretical value is based on 20% safety.
The flow calculation in relation to the theoretical value is based on 20% safety.