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Installation
5
If a concrete hold-down/anti-floatation pad is required
(see
Anchorage
), this bedding can be reduced to a depth
of at least 6 inches (
F
, Figure 1).
Basin Preparation
the sewage inlet flange must be mounted to the basin
at the depth required to achieve gravity flow into the
basin. the bottom of the basin must be at least 39” (1 m)
below the inlet pipe. one inlet flange for 4” sCH80
PVC is supplied. More than one inlet pipe may be used,
if desired. obtain additional inlet flanges from your
local dealer.
use a 5 inch hole saw to cut through the fiberglass basin
at the desired inlet location(s). Install the inlet flange
after deburring the inside and outside edges of the basin
hole(s). Chamfer the ends of the inlet pipe(s) for ease
of installation.
Position Basin in Excavation
NOTICE
under no circumstances is the use of chains or
cables around the basin shell permitted.
the proper way of moving a basin is by lifting it
with straps or cables (
B
, Figure 1) and spreader bar
(
C
, Figure 1) using optional lifting lugs (
A
, Figure 1) (not
more than 30° included angle) or by using a non-marring
sling around the basin. Before any attempt is made to
move the basin, it should be established that all the
equipment and accessories have sufficient capacity and
reach to lift and lower the basins without dragging and/or
dropping. Basins should be maneuvered with guide ropes
attached to the sides.
NOTICE
placement of a basin on a concrete pad or
compacted sub-base smaller than the total basin bottom
area or on intermediate supports (saddles) will cause
uneven distribution of loads. this may contribute to
structure failure and is never permitted.
Insert inlet pipe(s) so that 1” (3 cm) protrudes into the
basin. lubricate the inlet flange and pipe with soapy
water to ease installation.
the discharge piping must not be smaller than the
pump discharge. reduce the number of bends in the
discharge piping to keep the outlet flow as smooth
as possible. Full dimensional information is found in
Product Specifications
.
Be sure all inlet and discharge piping is properly
connected before backfilling. support for piping,
equipment and other accessories must be provided
during backfilling.
NOTICE
using the basin to support piping, equipment,
cribbing, bracing or blocking is never permitted. during
backfilling, temporary supporting materials must be
carefully installed and removed to prevent damage to the
basin, piping or equipment.
Backfill material (
E
, Figure 2) should be clean, well
granulated, free flowing, non corrosive and inert. It
should be free of ice, snow, debris, rock, or organic
material, all of which could damage the tank and
interfere with the compaction of the backfill material.
the largest particles should not be larger than ¾ inch.
approved backfill materials include:
• Pea gravel, naturally rounded particles with a
minimum diameter of 1/8 inch and a maximum
diameter of ¾ inch.
• Crushed rock, washed and free-flowing angular
particles between 1/8 inch and ½ inch in size.
Compaction of backfill materials should be adequate to
ensure the support of the tank and to prevent movement
or settlement. Backfill materials should be placed in
12 inch lifts (
B
and
E
, Figure 2) and compacted to
a minimum soil modulus of 700 pounds per square
inch (psi).
Anchorage
When basin installations are located in areas subject
to high water tables or flooding, provision should be
made to prevent the basins, either empty or filled, from
floating. all methods of anchoring basins (
D
, Figure 2)
use the weight of the backfill materials to offset the
buoyancy forces. the use of supplemental mechanical
anchoring methods (a concrete hold-down pad) increases
the amount of backfill ballast which is mechanically
attached to the basin. the recommended method of
attachment is to pour concrete grout (
F
, Figure 2) over
the basin’s anti-floatation flange (
H
, Figure 1) and
concrete hold-down pad (
F
, Figure 1).
requirements for anchorage, thickness of concrete
hold-down pads, as well as the size of anchors and
reinforcement must be calculated for each installation
based on the environmental conditions of that
specific installation.
