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Dear Members,
I need to select a Restriction Orifice (RO) to meet the process conditions below.
1) Fluid: Gas
2) Normal Flow: 397111 Nm3/h
3) Upstream Pressure: 152.4 kg/cm2
4) Diff. Pressure: 150.9 kg/cm2
5) Operating Temp.: 56 deg C
6) Density: 21.82 kg/m3
7) Viscosity @temp.: 0.01
8) Molecular weight: 5.196
9) Gas "Z": 1,08
10) Line size: 10", Sch160 CS(A106) pipe
11) Orifice material: SS316
However I have some questions regarding the type and calculation basis of the above particular RO and I would like to proceed the work after verification. Please comment with your valuable experience.
1. Possibility of Single Stage Restriction Orifice (RO).
Whether single stage orifice would be applicable or not. We could ignore big noise due to high velocity since this RO would apply only emergency depressuring of system pressure.
2. In case of Multi-stage RO considering high Velocity:
1) Bore Sizing Basis
- Background of sizing basis ex) AGA, ISO 5167 or any other code/standard.
2) Example (Former executed project...)
- Bore Calculation sheet
Note: Frankly speaking, I have doubt bore size of first and last stage.
In other words, bore size of all stage should be same or bigger down the line in sequence from inlet to outlet up to the last stage considering volume of gas at each stage.
Please do reply... Thanks in advance.
Regards,
Sanjay Varma
I need to select a Restriction Orifice (RO) to meet the process conditions below.
1) Fluid: Gas
2) Normal Flow: 397111 Nm3/h
3) Upstream Pressure: 152.4 kg/cm2
4) Diff. Pressure: 150.9 kg/cm2
5) Operating Temp.: 56 deg C
6) Density: 21.82 kg/m3
7) Viscosity @temp.: 0.01
8) Molecular weight: 5.196
9) Gas "Z": 1,08
10) Line size: 10", Sch160 CS(A106) pipe
11) Orifice material: SS316
However I have some questions regarding the type and calculation basis of the above particular RO and I would like to proceed the work after verification. Please comment with your valuable experience.
1. Possibility of Single Stage Restriction Orifice (RO).
Whether single stage orifice would be applicable or not. We could ignore big noise due to high velocity since this RO would apply only emergency depressuring of system pressure.
2. In case of Multi-stage RO considering high Velocity:
1) Bore Sizing Basis
- Background of sizing basis ex) AGA, ISO 5167 or any other code/standard.
2) Example (Former executed project...)
- Bore Calculation sheet
Note: Frankly speaking, I have doubt bore size of first and last stage.
In other words, bore size of all stage should be same or bigger down the line in sequence from inlet to outlet up to the last stage considering volume of gas at each stage.
Please do reply... Thanks in advance.
Regards,
Sanjay Varma