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PF-036 · Verified method

Equivalent Conductance in Parallel Calculator

Combine parallel pneumatic branches/components.

Inputs

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ENGINEERING GUIDE

Use the Equivalent Conductance in Parallel Calculator to combine parallel pneumatic branches/components. The calculator uses Parallel branches: C_Lsbar,b,m — one per line, Upstream absolute pressure, Downstream absolute pressure and Air temperature and reports equivalent conductance/flow.

How to interpret the result

Read the result in the context of the selected units and pressure basis. For this tool, the primary outputs are equivalent conductance/flow. Change one input at a time when comparing scenarios so the effect of each variable remains clear.

Formula and methodology

PneumaForge applies this verified method: Compute each parallel branch with ENG-16 at common P1/P2 and sum mass/reference flows; optional equivalent characteristic fitted numerically. The functional engine is shared with related tools in the iso6358-system family, while this page solves the specific intent represented by pneumatic components parallel flow calculator.

Compute each parallel branch with ENG-16 at common P1/P2 and sum mass/reference flows; optional equivalent characteristic fitted numerically.

Variables and inputs

  • Parallel branches: C_Lsbar,b,m — one per line
  • Upstream absolute pressure
  • Downstream absolute pressure
  • Air temperature

Worked example

Reproducible example: start with the calculator's default values (Parallel branches: C_Lsbar,b,m — one per line = 2,0.3,0.5\n1.5,0.35,0.5; Upstream absolute pressure = 7.01325; Downstream absolute pressure = 1.01325; Air temperature = 20) and calculate the result. Then change the variable most relevant to your application and compare the new equivalent conductance/flow against the baseline.

Assumptions and limits

Branches share inlet/outlet states; no interaction other than shared nodes.

Engineering tips

  • Use absolute upstream and downstream pressure for compressible-flow equations.
  • Check whether the flow is choked before applying a subcritical relation.
  • For ISO 6358 calculations, use measured C, b and m data from the component manufacturer whenever available.
  • Keep the inputs used for equivalent conductance in parallel calculator on a consistent engineering basis before comparing alternatives.

Frequently asked questions

What does the Equivalent Conductance in Parallel Calculator calculate?

It is designed to combine parallel pneumatic branches/components. The reported outputs are equivalent conductance/flow.

What inputs does the Equivalent Conductance in Parallel Calculator use?

The calculator uses Parallel branches: C_Lsbar,b,m — one per line, Upstream absolute pressure, Downstream absolute pressure and Air temperature. Only use values that represent the same operating condition or design case.

What formula or method is used?

The calculation follows: Compute each parallel branch with ENG-16 at common P1/P2 and sum mass/reference flows; optional equivalent characteristic fitted numerically. The page also states the assumptions that define where the method is valid.

Which assumptions can affect the result?

Branches share inlet/outlet states; no interaction other than shared nodes.

Can I use different units?

Yes. PneumaForge converts supported units through canonical engineering units. For compressed-air reference flows and pressure bases, the reference pressure and temperature must also remain consistent.