Instrument Air Consumption

Location Number of Valve

Continous

Rock Muffler 2

Sub Total 2

Intermittent

Rock Muffler 2

Sub Total 2

Instrument Air Demand ( 70% of Continous and 30% of Intermitten )

Margin of Air Leakage ( 15% of Instrument Air Demand )

Margin of growth ( 10% of Instrument Air Demand )

Margin of Compressor Rating ( 50% of Instrument Air Demand )

Total Instrument Air Demand

Note :

Utility air for flare ignition is assumed 5.25 scfm ( 8.919 Sm3/hr ) based on typical flare ignition

Mode of

Operation

Based on API 552 ( Ref. 3 ), instrument air consumption is estimated 1 scfm ( 1.699 Sm3/hr )

Utility air consumption for each area is assumed 0.15 scfm ( 0.2548 Sm3/hr ) for normal consumption

and 1.5 scfm ( 2.548 Sm3/hr ) for peak consumption

Instrument Air Consumption

3.40

0.00

0.00

0.00

3.40

3.40

0.00

0.00

0.00

0.00

0.00

0.00

3.40

3.40

0.51

0.34

1.70

5.95

Total Consumption

( Sm3/hr)

/hr ) for normal consumption

Utility Air Consumption

Utility Air ConsumerNormal

Separation Area 0.25

Compression System Area 0.25

Flue Gas System Area 0.25

Dehydration System Area 0.25

Produce Water Treatment Area 0.25

Flare System Area 0.25

Diesel System Area 0.25

Fire Water System Area 0.25

Gas and Diesel Engine Generator Area 0.25

Receiver Area 0.25

Sales Gas Superheater Area 0.25

Launcher Area 0.25

Total Utility Air 3.06

Utility Air Demand ( 70% Normal and 30% Peak )

Flare Ignition

Sub Total

Margin of Air Leakage ( 15% ofSub Total )

Margin of growth ( 10% of Instrument Air Demand )

Margin of Compressor Rating ( 50% of Instrument Air Demand )

Total Utility Air Demand

Note :

Utility air for flare ignition is assumed 5.25 scfm ( 8.919 Sm3/hr ) based on typical flare ignition

Total Consumption ( Sm3/hr)

Based on API 552 ( Ref. 3 ), instrument air consumption is estimated 1 scfm ( 1.699 Sm3/hr )

Utility air consumption for each area is assumed 0.15 scfm ( 0.2548 Sm3/hr ) for normal consumption

and 1.5 scfm ( 2.548 Sm3/hr ) for peak consumption

Utility Air Consumption

Peak

2.55

2.55

2.55

2.55

2.55

2.55

2.55

2.55

2.55

2.55

2.55

2.55

30.58

11.31

8.92

20.23

3.03

2.02

10.12

35.41

Total Consumption ( Sm3/hr)

/hr ) for normal consumption

KWARSA HEXAGON INSTRUMENT AIR RECEIVER CALCULATION

Client :Project :Calculation Number :

General InputEquipment Number =Unit = SIPiping Fluid/Service = Air

BasisAir Receiver Holding Time = 10 minuteInstrument Air Pressure Minimum = 80 PsigInstrument Air Pressure Maximum = 140 PsigInstrument Air Pressure Normal = 100 Psig

Total Instrument Air consumption = 13.20= 7.77 SCFM

Process ConditionVessel Type = VerticalMolecular Weight of Instrument Air = 28.85 kg / kgmolHolding Time = 10 minuteStandard Pressure = 14.7 PsiaMinimum Supply Pressure ( P2 ) = 94.7 PsiaNormal Supply Pressure ( P1 ) = 114.7 PsiaMaximum Supply Pressure ( P3 ) = 154.7 Psia

Temperatur Standard = 520

Temperatur Normal = 80.24

= 540.910Air Compressibility @ P2, T = 0.9966Air Compressibility @ P3, T = 0.9941Air Compressibility @ P1, T = 0.9957

Air Density @ P2, T = 7.58

Air Density @ P3, T = 12.42

Air Density @ P1, T = 9.19

Air Receiver Calculation Result

Volume of Air Receicer Tank = 59.40

= 1.68Vessel Calculation Result

L/D = 2Internal Diameter ( ID ) = 1.00 mLength ( T/T ) = 2.30

Avaiable Volume = 1.81

= 63.76Instrument Air Consumption = 0.26 Kg/min15 Holding Time = 3.87 kgMass of AIr @ P2, T = 13.686 kgMass of AIr @ P3, T = 22.424 kgAvaiable Hold Up = 8.74 kgRequired Hold Up = 3.87 kgRequired Holding Time = 10 minute

Sm3/hr

0R0F0R

kg/m3

kg/m3

kg/m3

ft3

m3

m

m3

ft3

Actual Holding Time = 10.73 minute

CheckVolumeRequired Volume < Available Volume OKHol Up CapacityRequired Capacity < Available Capacity OKActual Holding TimeReq. Holding Time < Actual Holding Time OK

CONCLUSION

1000 mm ID X 2300 mm T/T

Note OriginatorChecker

ApproverRev

1.173 Kg/m3 is Air density in Normal condition ( 80.24 0F and 101 kPa )

MEINDO ELANG INDAHUTILITY AIR RECEIVER CALCULATION

Client :Project :Calculation Number :

General InputEquipment Number =Unit = SIPiping Fluid/Service = Air

BasisAir Receiver Holding Time = 15 minuteInstrument Air Pressure Minimum = 80 PsigInstrument Air Pressure Maximum = 140 PsigInstrument Air Pressure Normal = 100 Psig

Total Instrument Air consumption = 35.41= 20.84 SCFM

Process ConditionVessel Type = VerticalMolecular Weight of Instrument Air = 28.85 kg / kgmolHolding Time = 15 minuteStandard Pressure = 14.7 PsiaMinimum Supply Pressure ( P2 ) = 74.7 PsiaNormal Supply Pressure ( P1 ) = 114.7 PsiaMaximum Supply Pressure ( P3 ) = 154.7 Psia

Temperatur Standard = 520

Temperatur Normal = 80.24

= 540.910Air Compressibility @ P2, T = 0.9974Air Compressibility @ P3, T = 0.9941Air Compressibility @ P1, T = 0.9957

Air Density @ P2, T = 5.98

Air Density @ P3, T = 12.42

Air Density @ P1, T = 9.19

Air Receiver Calculation Result

Volume of Air Receicer Tank = 119.50

= 3.38Vessel Calculation Result

L/D = 3Internal Diameter ( ID ) = 1.15 mLength ( T/T ) = 3.45

Avaiable Volume = 3.58

= 126.49Instrument Air Consumption = 0.69 Kg/min15 Holding Time = 10.38 kgMass of AIr @ P2, T = 21.418 kgMass of AIr @ P3, T = 44.484 kgAvaiable Hold Up = 23.07 kgRequired Hold Up = 10.38 kgRequired Holding Time = 15 minute

Sm3/hr

0R0F0R

kg/m3

kg/m3

kg/m3

ft3

m3

m

m3

ft3

Actual Holding Time = 15.88 minute

CheckVolumeRequired Volume < Available Volume OKHol Up CapacityRequired Capacity < Available Capacity OKActual Holding TimeReq. Holding Time < Actual Holding Time OK

CONCLUSION

1150 mm ID X 3450 mm T/T

OriginatorChecker

ApproverRev

1.173 Kg/m3 is Air density in Normal condition ( 80.24 0F and 101 kPa )

ῤ = P / ( R * T )Example

ῤ = Density 1.173013P = Pressure kPa 101

R = Specific gas constant 287.058

T = Temperature 299.95

Kg/m3

J/Kg oK0K

Density ρ 277.6 DensityTemperature Normal Tn 536.7 R Temperature StandardPressure Normal Pn 14.7 Psia Pressure Standard

Volumetric Flow at Normal Vn 14.4 Volumetric Flow ActualTemperature Standar Ts 492.0 R Temperature ActualPressure Standar Ps 14.7 Psia Pressure Actual

Volumetric Flow Standar Vs 13.201 Volumetric Flow at STD550058.7 CFH

Mass Flow Actual Qa 15577.7 CMH Mass Flow Actual4324359.0 Kg/hr9533568.4 lb/hr

15.5776622505

2.87 BPD0.018999 M3/H

994 kg/m318.8854 kg/hr

Kg/m3

Nm3/Hr

Sm3/Hr

Density ρ 11.12 T 59 CTemperature Standard Ts 519.8 R P 35.9 BarPressure Standard Ps 14.7 Psia

Volumetric Flow Actual Va 673.050 ACMHTemperature Actual Ta 598.2 RPressure Actual Pa 535.4 Psia

Volumetric Flow at STD Vs 21303.123 SCMH 0.511 MMSCMD752302.8 SCFH 18.0553 MMSCFD

Mass Flow Actual Qa 673.1 CMH7484.3 Kg/hr16500 lb/hr

17613.21 1752313.412 SCFH 17714.84 2

12517.27 317306.01 417634.62 57718.645 6

Kg/m3