Rectangular Decanter Specifications



Part 1


1.01 Scope Of Work

A. Under this section of the specification, the Contractor shall provide all labor, materials and equipment necessary to furnish, install, test and ready for operation of ________ (__) Floating Decanter Unit(s) as shown on the contract drawings and as specified herein.
B. The system shall be furnished by a single manufacturer who is skilled and experienced in the design, manufacturing, production, sizing and testing of Floating Decanter Units for backwash water recovery. All components and materials furnished in the system shall be of high quality by well-known manufacturers.

1.02 Referenced Standards

A. ANSI - American National Standards Institute

B. ASTM - American Society for Testing and Materials

C. OSHA - Occupational Safety and Health Administration, Code of Federal Regulations, (CFR 29)

1.03 Quality Assurance

A. Each decanter unit shall be completely shop assembled to assure proper fit-up. The decanter shall then be broken down and packaged for shipment and jobsite storage to prevent damage or corrosion.

B. The equipment seller shall be solely and fully responsible for warranty and mechanical design adequacy of all the equipment provided under this section of the specification.

C. The manufacturer shall be completely familiar with the operations of a water filtration plant, including filter backwashing. The manufacturer shall have a minimum of five (5) years experience in design and manufacturing of Floating Decanter Units and a minimum of five (5) installations.

1.04 Submittals

A. Copies of all materials to establish compliance with the specifications shall be submitted in accordance with the provisions as outlined. Submittals shall include at least the following:

1. Complete description of all materials.

2. Drawings showing complete dimensional data of the proposed decanter design including the outline dimensions, assembly data and mounting details.

3. A complete bill of materials

4. The weight of the complete decanter assembly and each major component.

5. Description of surface preparation, shop priming and finish painting.

6. Installation, operation and maintenance information

1.05 Operation and Maintenance Data

A. Operating and maintenance instructions shall be furnished per the instructions included in the specification. The instructions shall be prepared specifically for this installation and shall include start-up data, trouble shooting guides, routine maintenance procedures, drawings, equipment lists, descriptions, etc. that are required to instruct operating personnel.

1.06 Delivery, Storage and Handling

A. All materials and equipment shall be shipped, stored, handled and installed in such a manner as to not to degrade quality, serviceability or appearance. The equipment shall be stored in a clean, dry location free from construction dust, precipitation and excess moisture.

1.07 Tools and Spare Parts

A. Furnish one set of all special tools required for the proper servicing of all equipment supplied under these specifications




2.01 General

A. The equipment herein specified is intended when installed in accordance with the drawings and the manufacturer's recommendations to permit efficient operation at the design flow of __________ GPM. Such equipment shall utilize tube settlers consisting of a number of tube-like channels at least 4.0 square inches in cross sectional area being approximately 3'-0" long and orientated at approximately 60o from the horizontal to assure that the settled particles will be purged from the tubes by force of gravity alone. The equipment shall be designed, constructed and installed in accordance with the best practice and methods, and shall operate satisfactorily when installed as shown on the drawings.

B. All parts shall be so designed and proportioned as to have liberal strength, stability and stiffness and to be especially adapted for the work to be done.

2.02 Manufacturers

A. The Floating Decanter units shall be manufactured by Enviropax, Inc., of Salt Lake City, Utah or an engineer pre-approved equal.

2.03 Materials

A. The unit shall consist of tube settler modules in a _________ ft2 area, submerged orifice collection launder system, flotation devices, outer baffle all mounted in an integral support frame, and guided by an exterior guide post and hanger assembly to be supported from the thickener walkway bridge. The unit shall be designed and manufactured into an integral unit with proper allowance for flotation operation. Reclaimed water shall be discharged from the unit through the launder system into a flexible non-collapsible discharge hose provided by the reclaim manufacturer. submerged parts shall be made of corrosion resistant materials as noted below. All fasteners required for assembly of submerged parts shall be type 316 stainless steel.

2.04 Major Components

A. The tube settlers and outer baffle shall be constructed of Acrylonitrile Budadiene Styrene (ABS) and shall be strong, rigid, resistant to chemical deterioration in an outdoor environment. The tube settler modules shall be built-up of a number of corrugated sheets with alternately placed flat sheets. The individual sheets shall be solvent welded to provide strong continuous bonds and thereby form a durable homogenous structure with each tube being continuous and imperforate, eliminating mixing currents that resuspend settled solids within the tube. The corrugated sheets shall have the inclined channel configurations molded integrally therein, so that all of the tubes shall have the same angle of inclination when installed in the basin. The finished (after thermo-forming) thickness of the plastic used in the modules shall not be less than twenty (20) mils and twenty-five (25) mils for the corrugated and flat sheets respectively. The edges of the plastic shall be clean, smooth and free from burrs caused by sawing or trimming the parts to minimize the possibility of sludge buildup or growth.


B. The submerged orifice collection launder system and integral support frame shall be constructed of 6061-T6 aluminum structural members and be adequately designed to support all the components in the system. The launder and support system shall be fully shop assembled to assure integrity and then broken down into sub-components for field assembly by others with 316 SS fasteners, which shall be provided by the decanter manufacturer. The launder system and submerged orifices shall be sized to provide even flow distribution above the entire area covered by the tube settlers.


C. The flotation devices shall be one (1) piece construction, continuous molded high density polyethylene shell provided with a solid polystyrene core. The shell material shall be provided with UV inhibitors to assure long life. The shell shall be provided with an integrally formed mounting flange for attachment to the support.


D. The discharge hose shall be a ribbed, non-collapsible, flexible hose constructed of virgin, high impact polyvinyl chloride (PVC). The hose shall be provided with factory supplied cam and grove type connectors for attachment to the reclaim discharge and outlet flanges.

E. The decanter guide and support assembly shall be constructed of 6061-T6 aluminum structural vertical and lateral members with additional stainless steel cable supports. The guide shall provide for a smooth transition through the various operating depths, and be capable of supporting the decanter unit in the low position.




3.01 Installation

A. Install in accordance with the manufacturers written instructions and as approved.

3.02 Inspection and Testing

A. After completion of installation, the equipment shall be tested by the contractor under actual operating conditions. The tests shall demonstrate that the system and individual equipment items operate properly and in all other respects fulfills its function properly and meets all requirements of the specifications.

3.03 Manufacturers Service

A. The Contractor shall have the equipment manufacturer furnish an expert factory-trained technical representative for a minimum period of two (2) full days to supervise the installation, check, the completed installation and to supervise initial operation and testing. These representatives shall also instruct the Owners personnel in the proper operation and maintenance of the equipment. No visit shall be less than five (5) hours duration.


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