Roxul Industrial Insulation Process - Manual (Page 65)

Support rings
With vertical applications, the weight of the
insulation can damage the insulation layer below.
To avoid damaging the insulation, fit horizontal
support rings if higher than 14 ft (4 m). The
distance between the support rings should not
exceed 10 ft (3 m). The construction should be
built so that leakage water can be expelled from
the insulation.
expansion
Large storage tanks expand due to changes in
temperature and if the substance stored is filled
or discharged (sometimes referred to as
“bulging”). These factors can increase/decrease
the tank diameter. Example: The diameter of a
storage tank - Ø 65 ft (20 m), Avg T 430 °F (220 °C)
- will increase approx. 2 1/2" (60 mm). This
consequently increases the tank circumference by
approx. 7" (180 mm). To avoid stress/tension on
the insulation protection (aluminum sheeting)
selecting flexible ProRox
® insulation board (slab)
or wrap (mat) is important. For high
temperatures, anticipate further expansion by
fitting profiled sheeting.
Ladders and manholes
The necessary space requirements for the
insulation must be taken into account when
designing and planning the installation. The
distance between the ladder and the tanks should
be large enough to make installing insulation
afterwards possible. Insulate manholes so they
can still be used frequently without damaging the
insulation.
tank wall and tank base connection
When a tank is filled, stress may occur at the
welded seam between the wall and base of the
tank. For inspection purposes the first 1 1/2 ft
(50 cm) of the tank wall should not be insulated.
The first support ring is usually welded above this
level and constructed so that leakage water can
be expelled from the insulation.
1.5 Insulation of storage tanks
1. Tank wall - 2. Spacer - 3. ProRox ® insulation
1. Horizontal support ring - 2. Spacer - 3. Fixing
5 ft
(15
00
mm
)
5 f
t
(1
50
0 m
m)
5
ft
(1
50
0
m
m
)
5 ft
(15
00
mm
)
5 f
t
(1
50
0 m
m)
5
ft
(1
50
0
m
m
)
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