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PROCEPTOR®
TECHNICAL MANUAL
7 Installation
7.1 INSTALLATION PROCEDURES
INSTALLATION MANUAL
PROCEDURE
Use this procedure together with the applicable installation drawing.
A) EXCAVATION
1. Excavation for the installation of a Proceptor separator must conform to OSHA and/or local excavation codes and
standards. Topsoil removed during excavation should not be used as approved backfill material.
2. Excavation should include an allowance for shoring and bracing where required. For multiple tank units, ensure
adequate space between tanks for performing compaction when required and making connections between tanks.
3. In areas with a high water table, continuous dewatering must be provided to ensure that the excavation is stable and
free of water.
B) INSTALL AND LEVEL GRANULAR BASE
1. A 6" layer of pea gravel (or approved equivalent backfill compacted to 98% S.P.D.) must be installed and leveled at the
bottom of the excavation to the proper elevation for the installation of the separator base.
2. For installations where the subsurface water level may rise above the bottom of the tank at any time, continue to step C.
Otherwise, install and level the tank(s) and go to step D.
C) ANTI-BUOYANCY SLAB FOR HIGH SUBSURFACE WATER LEVELS
An anti-buoyancy slab is required for installations where the subsurface water level may rise above the bottom of the tank
at any time. There is potential for significant buoyancy forces on empty fiberglass tanks during periods of high subsurface
water levels. Accordingly, 20 MPa (3000 psi) concrete must be poured around the lower portion of the tank as an anti-
buoyancy backfill.
1. If material other than pea gravel is used, install a geo-textile filter fabric in the excavation to prevent migration and
compact backfill in 6" to 8" layers to 98% S.P.D. The contractor is responsible for purchasing and installing the filter
fabric.
2. Install and level the tank on the backfill. Use metal lifting lugs on upper sides of tank for handling, if equipped. Do not
use any of the pipe fittings on the tank for lifting purposes. When lifting with slings, use load level beams
3. The contractor must fill the separator with water to the recommended weight of the buoyancy slab as indicated on the
Installation Procedure Drawing prior to pouring concrete around the unit.
4. Pour concrete ready mix buoyancy slab all around the separator cells to the weight shown on the Installation Procedure
Drawing. Ensure that the anchor brackets (if equipped) on the side of the tank are covered.
D) BALLAST TANK
If continuing from Step B), fill the separator with water up to the outlet pipe.
E) GRANULAR BACKFILL TO THE INLET AND OUTLET PIPES
Pea gravel (or an approved equivalent backfill compacted to 98% of Standard Proctor Density in each layer) must be placed
in uniform layers of 150 mm (6") to not more than 200 mm (8") in depth up to the bedding for the inlet and outlet pipes.
Note: Backfill is not to contain topsoil. See end of document for backfill specification.
