"Rule of Thumb" Guide for ASME LP-Gas Storage Containers
- D = Outside tank diameter in inches
- L = Overall length of tank in inches
- K = Constant for percent volume of liquid in container
| Percentage of Container Filled |
K equals | Vapourization Capacity at 0 F (in BTU/hr) |
| 60 | 100 | D x L x 100 |
| 50 | 90 | D x L x 90 |
| 40 | 80 | D x L x 80 |
| 30 | 70 | D x L x 70 |
| 20 | 60 | D x L x 60 |
| 10 | 45 | D x L x 45 |
These formulae allow for the temperature of the liquid to refrigerate at -20 degrees F. (below zero), producing a temperature differential of 20 degrees F for the transfer of heat from the air to the container's "wetted" surface and then into the liquid. The vapour space area of the vessel is not considered. It's effect is negligible.
Vapourizing Capacities for Other Air Temperatures
Multiply the results obtained with the above formulae, by one of the following factors for the prevailing air temperature.
| Prevailing Air | Prevailing Air | ||
| Temperature | Multiplier | Temperature | Multiplier |
| -15 F | 0.25 | +5 F | 1.25 |
| -10 F | 0.50 | +10 F | 1.50 |
| -5 F | 0.75 | +15 F | 1.75 |
| 0 F | 1.0 | +20 F | 2.00 |
