Tables

Numbers I look up often enough to keep here.

Cylinder sizes in common use

NominalTare, typicalWater capacity
5 kg6.2–7.4 kg12.0 l
11 kg11.5–13.8 kg26.2 l
27 kg25–29 kg64.0 l

Vapour pressure of propane

TemperatureGauge pressure
-20 °C1.4 bar
0 °C3.7 bar
+20 °C7.4 bar
+40 °C13.1 bar

Figures are for commercial propane and vary with the butane fraction. Treat them as a sanity check, not as a specification.