3
Rail Support Brackets:
The TL lift-outs are designed to
use 2" standard pipe for guide
rails. A top rail support bracket
is available to be mounted to
the hatch frame. Intermediate
brackets are available for deep
basins. It is recommended that if
the rail length is over 21', that an
intermediate bracket be installed.
After every additional 20' of rail,
another intermediate bracket
should be used for proper rail
support.
Basin Covers:
Hydromatic has several types of
basin covers available for use
with either fiberglass or concrete
basins. Basin hatch type covers
are available in either steel or
aluminum construction. The
basin cover frame is designed to
allow for mounting of rail support
brackets.
Basin Bottom:
All cement pipe basins must have
a smooth level troweled bottom
for level mounting of discharge
casting.
Level Sensing Controls:
Intrinsically safe type float
controls are recommended for
all applications and required for
hazardous location/nonsparking
service. An intrinsically safe
control panel relay will limit the
current and voltage to the level
controls. A Hydromatic control
panel can be supplied with this
type circuitry.
The float level controls maintain
the basin sewage water level by
controlling pump turn-on and
turn-off levels.
1. The lower turn-off control
should be set so that the pump
stops at approximately the
top of the pump. Consult the
factory for any settings below
this point.
2. The upper turn-on control
should be set above the
lower turn-off control. The
exact height between the two
controls is determined by
the number of pump starts
desired and the depth of basin.
A maximum of 10 starts per
hour should not be exceeded.
3. The override control is set at
a specified height above the
upper turn-on control.
4. The alarm control is set about
6" – 12" above the override
control.
5. No control should be set
above the inlet invert.
Valves:
It is recommended that all check
valves and shut-off valves be
mounted outside the sump in a
valve box. (See typical drawing
detail, Fig. 1.) Shut-off valves
should be of the water works
approved type with resilient
rubber disk seat.
CAUTION: After the pump
is installed and sewage has
entered the basin there is
danger. Sewage water gives off
methane and hydrogen sulfide
gases, which are poisonous.
Never enter a wetwell unless
proper confined space entry
procedures are followed.
Installing Rail
System Parts
(Fig. 3)
Mounting Cover, Discharge
Base and Rails:
1. Set concrete cover with hatch
opening in position.
2. Bolt top rail support plates
(Fig. 4) to hatch frame. The
plate has slots so the two
plates in a duplex system
can be adjusted to obtain
required center-to-center
distance between pumps.
3. Lower the base or base/elbow
assembly into the basin.
4. Position the base elbow
assembly by dropping a
plumb line from center of
pipe supports, located on top
rail support plate, to center
of tapered pins protruding
from the top of the base elbow
assembly. Level the elbow
flange in two directions, 90°
to each other. Shims may
be required under the base
in order to obtain this level
condition. Mark the position
of the base hold-down bolts
through the holes in the base.
5. Move the base aside to allow
drilling of the concrete for
3/4" expansion bolts, 2-1/2"
long. Move the base over the
bolt holes and recheck with
level and plumb line. Install
expansion bolts.
6. Cut the pipe guide rails to the
proper length and install them
between the pipe supports at
the top of the basin and pins
on the base. Guide rails are
Schedule 40, galvanized or
stainless steel.
7. Install discharge pipe as
required by the particular job
specifications.
IMPORTANT: Discharge
pipe and guide rails must
be parallel if intermediate
guide bracket is used.
8. If the top rail support plate
cannot be attached to the
hatch cover frame, a special
rail bracket (Fig. 5) can
be furnished for mounting
directly to a pipe cemented in
the basin wall. This bracket is
