Regulator & Station Piping Sizing

Sizing of regulator is performed using Universal Gas Equation:
1. For Subsonic Flow

𝑄 = Gas Flowrate,[scf/h]
𝐺_𝑓 = Gas Specific Gravity
𝑇 = Absolute Temperature,[°R]
𝐶_𝑔 = Gas Sizing Coefficient
𝐶_𝑣 = Liquid Sizing Coefficient
𝐶₁ =  𝑃₁ = Gas Sizing Coefficient
∆𝑃 = 𝑃₁ − 𝑃₂ − Differential Pressure Across Valve
𝑃₂ = Outlet Pressure, [psia]
2. For Sonic Flow equation is reduced to:

Input Parameters

1. To create a new case, click the “Add Case” button
2. Select the Regulator & Station Piping Sizing application from the Regulators & Meters module list.
3. Enter Case Name, Location, Date and any necessary notes.
4. Fill out all required fields.
5. Make sure the values you are inputting are in the correct units.
6. Click the CALCULATE button.

• Class Location
• Temperature
• F – Design Factor
• T – Temperature Derating Factor
• Gas Specific Gravity
• Regulator Sizing Data
  • P1 – Inlet Pressure
  • P2 – Outlet Pressure
  • Q – Flow Rate
  • Gas Specific Gravity
  • Flowing Gas Temperature
  • C1 – Valve Recovery Coefficient
  • Capacity Factor (80% Recommended)
• Upstream Pipe and Operational Data
  • P1 – Operating Pressure – Upstream
  • Q – Flow Rate
  • V – Assumed Gas Velocity
  • F – Design Factor
  • T – Temperature Derating Factor
  • SMYS – Specified Minimum Yield Strength
  • E – Longitudinal Joint Factor
• Downstream Pipe Operational Data
  • P2 – Operating Pressure – Downstream
  • Q – Flow Rate
  • V – Assumed Gas Velocity
  • F – Design Factor
  • T – Temperature Derating Factor
  • SMYS – Specified Minimum Yield Strength
  • E – Longitudinal Joint Factor

Outputs/Reports

1. View the results.
2. If an input parameter needs to be edited be sure to hit the CALCULATE button after the change.
3. To SAVE, fill out all required case details then click the SAVE button.
4. To rename an existing file, click the SAVE As button. Provide all case info then click SAVE.
5. To generate a REPORT, click the REPORT button.
6. The user may export the Case/Report by clicking the Export to Excel/PowerPoint icon.
7. To delete a case, click the DELETE icon near the top of the widget.

• Regulator Sizing Results
  • Cg – Gas Sizing Coefficient – Calculated
  • Cgr – Gas Sizing Coefficient – Recommended
  • Flow Conditions:
• Upstream Results
  • ID1 – Calculated Inside Diameter
  • Minimum Required Pipe Wall Thickness
  • OD1 – Calculated Outside Diameter

• Downstream Results
  • ID1 – Calculated Inside Diameter
  • Minimum Required Pipe Wall Thickness
  • OD1 – Calculated Outside Diameter

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