LPG composition

100% Propane Default (Indian LPG) Customize

Propane (C3H8)

Propylene (C3H6)

n-Butane (C4H10)

Iso-butane (C4H10)

Butylene (C4H8)

Pentane (C5H12)

Pentene (C5H10)

Ethane (C2H6)

Ethylene (C2H4)

Total percentage 100.00 %

Operating conditions

Relative humidity of air (%)

Temperature (°C)

Gauge pressure (bar)

Net calorific value

Free

GCV — kCal/kg

Energy loss in process — kCal/kg Energy loss = latent heat of water vapor (combustion water + atmospheric humidity in combustion air). Air taken at sea-level conditions with 21% oxygen by mole; atmospheric humidity evaluated at 25 °C ambient with the RH entered above.

 NCV for the composition — kCal/kg 

Density

Locked Unlocked

Z factor 0.00000 dimensionless

Molecular weight 0.0000 g/mol

 Density 0.0000 kg/m³ 

Z factor calculated using the Peng-Robinson equation of state with mole-fraction mixing rules.

Pipe sizing

Locked Unlocked

LPG flow (kg/hr)

Velocity (m/s)

Ideal is 10 to 15 m/s.

in AM³ 0.00 m³/hr

in SM³ 0.00 m³/hr at 15 °C and 1 ATM

in NM³ 0.00 m³/hr at 0 °C and 1 ATM

NCV for the total LPG flow 0

 Required pipe diameter 0.00 mm 

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Branded PDF with composition, conditions, NCV, density and pipe sizing — formatted for engineering review and sharing.

Methodology: Z Factor by Peng-Robinson EOS with k_ij = 0 mixing. GCV per BIS IS 1448 / NIST. NCV via ASTM/ISO latent heat reference (583 kCal/kg at 25 °C, water vapor from combustion + atmospheric humidity). Atmospheric humidity is evaluated at 25 °C ambient with the user-specified RH — combustion air is drawn from ambient, not from the LPG operating temperature. Density via ideal gas + Z compressibility. Pipe sizing for vapor-phase flow at operating P, T. Standard volumes (SM³, NM³) are ideal-gas conversions for display.

Disclaimer: Indicative engineering output only. Actual values depend on composition certification, calibration of instruments, fluid properties at non-standard conditions, and installation factors not modelled here. Not a substitute for engineering review. Contact GASSOL for system design.

Branch line sizing

Sizing branches for a complex system?

Mainline plus multiple branches with varying flows and pressures across a single installation is project engineering territory. Our team handles full system sizing — including pressure drop reconciliation, regulator selection, and burner-side validation — as part of design consultation. The single pipe-sizing tool above covers individual line sizing; for full system design, talk to engineering.

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