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PF-054 · Verified method

Compressed Air Ring Main Sizing Calculator

Size a loop/ring distribution main considering two-direction feed.

Inputs

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ENGINEERING GUIDE

Use the Compressed Air Ring Main Sizing Calculator to size a loop/ring distribution main considering two-direction feed. The calculator uses Reference air flow, Total ring length, Upstream absolute pressure and Allowable pressure drop and reports recommended main size; branch flows; worst-point pressure.

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 recommended main size; branch flows; worst-point pressure. 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: Solve ring network by mass balance at nodes and pressure-loss relation on each path; iterate flow split until both path pressure drops to each demand node agree. The functional engine is shared with related tools in the pipe-network family, while this page solves the specific intent represented by compressed air ring main sizing calculator.

Solve ring network by mass balance at nodes and pressure-loss relation on each path; iterate flow split until both path pressure drops to each demand node agree.

Variables and inputs

  • Reference air flow
  • Total ring length
  • Upstream absolute pressure
  • Allowable pressure drop

Worked example

Reproducible example: start with the calculator's default values (Reference air flow = 500; Total ring length = 100; Upstream absolute pressure = 7.01325; Allowable pressure drop = 0.2) and calculate the result. Then change the variable most relevant to your application and compare the new recommended main size; branch flows; worst-point pressure against the baseline.

Assumptions and limits

Steady state; known topology/demands; positive absolute pressures.

Engineering tips

  • Use internal pipe diameter, not nominal outside diameter.
  • Include fittings and local losses when the run contains many bends, tees or valves.
  • Check the worst pressure at the point of use rather than only total system pressure drop.
  • Keep the inputs used for compressed air ring main sizing calculator on a consistent engineering basis before comparing alternatives.

Frequently asked questions

What does the Compressed Air Ring Main Sizing Calculator calculate?

It is designed to size a loop/ring distribution main considering two-direction feed. The reported outputs are recommended main size; branch flows; worst-point pressure.

What inputs does the Compressed Air Ring Main Sizing Calculator use?

The calculator uses Reference air flow, Total ring length, Upstream absolute pressure and Allowable pressure drop. Only use values that represent the same operating condition or design case.

What formula or method is used?

The calculation follows: Solve ring network by mass balance at nodes and pressure-loss relation on each path; iterate flow split until both path pressure drops to each demand node agree. The page also states the assumptions that define where the method is valid.

Which assumptions can affect the result?

Steady state; known topology/demands; positive absolute pressures.

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.