Endress+Hauser NXA820 - Annex A.2

Tankvision Calculations
Endress+Hauser 71
8.9 Annex A.2
Insulation factors for various tank geometries
L00-NXA82xxx-16-00-00-xx-014
Fixed Roof
Tank
d = dry
Ts = Ifw * Tp + (1 - Ifw) * Ta
v = vapor
a = ambient
w = wet
TS =
Recommended
Insulation
Factor (IFw)
Ifw = (.825) Ifw = 1.0 Ifw = 1.0 Ifw = 1.0 Ifw = 1.0 Ifw =
p = product
Insulated
Tank
Tank with
Still. Well
(SW)
Tank with
Internal
FR & SW
External
Floating Roof
Tank with SW
Floating or
No Roof -
Direct
measurement
T
V
T
V
T
V
T
d
T
a
T
a
T
a
T
a
T
a
T
a
T
P
T
P
T
P
T
P
T
P
T
w
T
d
T
w
T
P
T
V
* Tp + * Ta
7
8
1
8
7
8
7
8
* Tp + * Ta
7
8
1
8
Tp Tp Tp Tp