Unit conversions

This module provides convenience conversions often used in survey workflows. The conversions are intended as practical calculator functions.

Density conversions

• 15C vacuum 9 15C air: converts absolute density to apparent density.
• 15C air 9 15C vacuum: reverse conversion.
• Relative density @15C: based on a reference density of water.
• API  relative density @60/60F: API gravity to relative density.

Volume/weight conversions

• m @15C  Long tons (in air): converts a standard volume to weight using apparent density.
• m @15C  bbl @60F: uses CTL/VCF internally (high-level behaviour only).

dens15air = dens15vac * 1.000149926 - 1.199407795

dens15vac = (dens15air + 1.199407795) / 1.000149926

relDens15 = dens15vac / 999.102

relDens60 = 141.5 / (api + 131.5)

dens15air = dens15vacTo15Air(dens15vac)
kgToLongTons = 0.0009842065276
longTons = cbmAt15 * dens15air * kgToLongTons

vcf = CTL_or_VCF(dens15vac, baseTemp=15.5556C, group)
barrels = cbmAt15 / (vcf * 0.1589872949)

Notes

• If a conversion depends on CTL/VCF, treat the result as a calculation aid.
• Always confirm your units (kg/m vs kg/L, C vs F, m vs bbl).