Defines the environmental factor according to Table 9 of API- 2000.
English Units:
|
Configuration |
Conductance (BTU/hr ft2 F) |
Insulation Thickness (in) |
F Factor |
|---|---|---|---|
|
Bare metal tank |
--- |
0 |
1.0 |
|
Insulated tank |
4.0 |
1 |
0.3 |
|
Insulated tank |
2.0 |
2 |
0.15 |
|
Insulated tank |
1.0 |
4 |
0.075 |
|
Insulated tank |
0.67 |
6 |
0.05 |
|
Insulated tank |
0.50 |
8 |
0.375 |
|
Insulated tank |
0.40 |
10 |
0.300 |
|
Insulated tank |
0.33 |
12 |
0.025 |
|
Concrete or Fireproofing |
--- |
--- |
see note C |
|
Water-application facilities |
--- |
--- |
1.0 |
|
Depressuring and emptying |
--- |
--- |
1.0 |
|
Underground Storage |
--- |
--- |
0.0 |
|
Earth-covered storage above Grade |
--- |
--- |
0.03 |
|
Impoundment away from tank |
--- |
--- |
0.5 |
Metric Units:
|
Configuration |
Conductance (Watts/m2 K) |
Insulation Thickness (cm) |
F Factor |
|---|---|---|---|
|
Bare metal tank |
--- |
0 |
1.0 |
|
Insulated tank |
22.7 |
2.5 |
0.3 |
|
Insulated tank |
11.4 |
5 |
0.15 |
|
Insulated tank |
5.7 |
10 |
0.075 |
|
Insulated tank |
3.8 |
15 |
0.05 |
|
Insulated tank |
2.8 |
20 |
0.375 |
|
Insulated tank |
2.3 |
25 |
0.300 |
|
Insulated tank |
0.19 |
30 |
0.025 |
|
Concrete or Fireproofing |
--- |
--- |
see note C |
|
Water-application facilities |
--- |
--- |
1.0 |
|
Depressuring and emptying |
--- |
--- |
1.0 |
|
Underground Storage |
--- |
--- |
0.0 |
|
Earth-covered storage above Grade |
--- |
--- |
0.03 |
|
Impoundment away from tank |
--- |
--- |
0.5 |