Top version
Ø (mm)
150S
2900
150L
3200
4.2.2 Prepare the pit base
• Check that the pit bottom is even before preparing the base.
• Check that the base is flat, evenly compacted, and horizontally leveled before installing
the unit.
• Prepare a pit base as per the applicable requirement.
WS007153A
Figure 8: Pit base design
1. Compacted fill
2. Flange
3. Backfill
4. Concrete base, cast at site
5. Prefabricated concrete base
Top version
Pit base requirement
50-65-80
Compacted sand
100–150
Prefabricated concrete base or concrete footing
case at site. See
4.2.3 Install the unit
1. Before installing the unit, visually check that the tank and the internal pipework are
undamaged.
2. Lift the unit on to the pit base in a vertical position and align it.
NOTICE:
Never lift the unit with a pump inside it.
Use both lifting eyes when lifting the unit.
WS007151A
3. Check that the unit is in level.
4.2.4 Anchorage
TOP 50-65-80 units are equipped with a horizontal flange at the bottom. The weight of
backfill material on the flange prevents the unit from floating up.
For TOP 100–150 units, the anchoring bars that are fixed to the unit must either be bolted to
a prefabricated concrete base or secured by a concrete footing cast at site.
Requirements for concrete footing:
• The minimum concrete quality is ENV 206, C30/37.
• To make sure sufficient anchorage, use concrete footing dimensions according to the
table.
4 Installation
14
Flygt Top Installation, Operation, and Maintenance Manual
