Asianloop – Custody Calculator

Inputs — Liquid

Measured Volume (V)

Units at right

Volume Unit

Measured Temperature T (°C)

Reference Temperature T_ref (°C)

CTL Mode

Thermal Expansion Coefficient α (per °C)

Density @ T_ref (kg/m³, optional)

HHV (MJ/kg, optional)

Tip: You can enter table CTL directly, or use α for a quick approximation.

Results

CTL used

—

Corrected Volume (V_corr)

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Unit

—

Mass (optional)

—

Energy (optional)

—

Inputs — Dry Gas (Natural Gas)

Volumetric Flow @ Line (Q_line)

Units at right

Q_line Unit

Standard Conditions Preset

Flowing Pressure P (absolute)

Units at right

Pressure Unit

Flowing Temperature T (°C)

Z-Factor Source

Z (dimensionless)

Optional: Gas Density @ std (kg/m³) or SG (γ_g)

≤ 2 → treated as SG; otherwise kg/m³.

Optional: Gross Calorific Value (MJ/Sm³)

Mass & energy outputs need SG/ρ and GCV.

Z note: Manual Z best (dataset). Gravity/Composition are approximations; AGA8-Detail auto-used if available.

Results — Dry Gas

Z used

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Q_std (standard volume flow)

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Standard Base

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Mass Flow

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Energy Flow

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Reference Documents

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About

This list opens official landings or public PDFs where available.

Notes

V_corr = V × CTL. If available, prefer API table CTL (Manual mode).
Approximate CTL uses CTL ≈ exp[-α (T − T_ref)]. Good for small ΔT.
Mass (kg) = V_corr (m³) × ρ_ref (kg/m³). Energy (MJ) = Mass × HHV.
Gas: Z via Papay/Kay is an approximation. For contractual accuracy, use Manual Z or AGA8-Detail.
📕 Need full guidance? Open the User Manual (PDF)