Fuel
Dispensers
TATSUNO
EUROPE
‐
Installation
and
User
Manual
,
revision
10,
January
2022
97
Picture
73
–
Example
of
connection
of
the
dispenser
with
suction
pumps
to
the
aboveground
storage
tank
Legend:
1
–
dispenser,
2
–
vapor
return
line
(recuperation),
3
–
suction
fuel
line,
4
–
suction
basket
(without
non
‐
return
valve),
5
–
above
‐
ground
fuel
tank,
6
–
overpressure
non
‐
return
valve
(OPW
199ASW),
7
–Drain
and
shut
‐
off
valve,
8
–
return
line
from
the
dispenser
pump
separator,
9
–
drip
tray
with
base
frame
of
the
dispenser,
10
–
connection
piece
(bellows)
with
flange
NOTICE
Overground
storage
tank
.
The
pumping
monoblock
of
dispensers
is
designed
with
a
permanently
open
‐
air
separator
into
the
venting
chamber
formed
by
the
space
in
the
monoblock
body
and
the
monoblock
lid
space.
A
hole
with
an
integrated
DN6
connection
for
connecting
the
air
exhaust
pipe
is
in
the
top
of
the
lid.
To
prevent
overfilling
of
the
pumping
monoblock
venting
chamber
and
leakage
of
the
medium
into
the
dispenser
interior
and
then
into
its
surroundings
in
case
of
leakage
or
blockage
of
the
check
valve
when
the
dispenser
is
out
of
operation,
it
is
necessary
to
connect
the
outlet
of
the
pumping
monoblock
separator
to
the
storage
tank
.
This
connection
can
be
made
using
a
pipe
Ø
10
x
1
(DN8)
connected
to
the
DN8
pipe
connection.
The
pipe
connection
is
screwed
through
the
seal
in
the
M12x1.5
hole
in
the
top
of
the
monoblock
lid.
The
pipe
outlet
must
be
inserted
into
the
storage
tank
lid
using
the
DN8
corner
connection
.
3.3.6.
DESIGN
OF
PIPELINES
The
dispenser
manufacturer
recommends
conducting
piping
in
a
standard
way
where
a
separate
pipeline
runs
from
each
pump
in
the
dispenser
to
a
relevant
fuel
tank.
NOTE
There
is
also
a
so
‐
called
backbone
piping
system
where
several
dispensers
(pumps)
are
connected
to
one
supply
pipeline
from
the
storage
tank.
The
dispenser
manufacturer
does
not
recommend
this
backbone
piping
system
due
to
possible
instability
of
the
fuel
suction
from
storage
tanks.
If
the
designer
decides
for
the
backbone
piping
system,
the
dispenser
manufacturer
requires
to
include
disk
valves
in
the
suction
pipeline
which
will
functionally
separate
the
dispensers
from
one
another.
