|
|
Wastewater Treatment equipment manufacturer including grit master grit washer, grit conveyor, helical skimmers, nonmetallic helical skimmers, non-metallic helical skimmers, gritmaster grit washer, rotary scum skimmers, dipping trough skimmers, flight monitoring system, DAF, Plate settlers, and Hydropneumatic systems for Water and Wastewater Treatment applications |
|
|
|
|---|---|
|
1.0 - GENERAL Helical scum skimmers shall be suitable for installation in rectangular sedimentation tanks as shown on the drawings. Each skimmer shall be designed for operation in a ____ foot wide basin in which the normal water surface may vary 2 inches from the normal elevation of ____. The equipment shall be supplied by a manufacturer with 10 years experience in similar equipment, "Helical Skimmer" by Polytech Systems, Inc. or equal. 1.3 - MATERIALS All structural steel shall conform to the Standard Specifications for Structural Steel for Building of the American Society for Testing Materials (ASTM). All iron castings shall be of tough, close-grained gray iron, free from blow holes, flaws, or excessive shrinkage and shall conform to the Standard Specification for Gray Iron Castings (ASTM). 2.0 - HELICAL REEL Each helical reel unit shall consist of a neoprene or synthetic rubber strip bolted to steel spiral blades by use of a steel clamp bar. Mounting hardware shall be 316 stainless steel. The spiral blades shall be supported by steel arms welded to Schedule 80 pipe provided with steel flanges, securely welded perpendicularly to the centerline of the pipe. For each reel unit, provide two (2) helical blades mounted diametrically opposite on the center pipe. Each blade shall be pitched to complete one spiral in the length of pipe and shall have a 1-foot 1-inch diameter. The helical blade of the adjacent unit on the same side of the scum trough shall have its pitch in the opposite direction. Maximum deflection per reel unit shall be 1/4-inch. 2.1 - REEL SHAFT All shafting shall be of cold finished steel and of ample size to transmit the power required. Key ways with fitted keys shall be provided where necessary. Collars of ample size securely attach to shaft with set screw shall be provided where necessary to keep the skimmer in proper alignment. Cast iron or fabricated steel flanges shall be keyed to the shafting for fastening to the reel. 2.2 -BEARING
ASSEMBLIES Each reel unit shall have two steel shaft ends mounted in a wall ring type with a U.H.M.W. insert bearing located generally as shown on the drawings. Bearings shall be provided with industrial type lubrication fittings with stainless steel grease tubing extended up to the operating walkways. Bearing assemblies shall be aligning. 2.3 - DRIVE CHAIN Drive chain shall be non-metallic NH-78 manufactured of a reinforced nylon resin with stainless steel pins. Chain shall consist of 2.609 inch pitch links, and shall have a minimum working load of 1740 pounds. 2.4 - SPROCKETS The collector chain drive sprockets shall have chain-saver rims and shall be split construction to> facilitate installation. Sprockets shall be 100% cast nylon-6. All sprockets to be compatible with non-metallic chain. 3.0 - DRIVE UNIT The drive unit shall consist of an electric motor and helical gear reducer, complete with properly sized shear pin, driving two ____ foot long helical reel units by means of two output shafts with a driver sprocket on each shaft connected to a driven sprocket. Two drive units shall be provided for each primary tank. Gear reducer shall have an AGMA service factor rating of 2.0 and shall be equipped with anti-friction bearing with a bearing life of 25,000 hours, minimum. Gears shall be steel, cut to accurate form and encased in a heavy moisture and oil proof case. The helical reel speed shall be 1 rpm with the drive unit operated at 1.75 rpm with an output ration of 1000 to 1. The coating shall be for corrosive overload protection and independent operation shall be provided. Approved drive unit enclosures shall be provided. 3.1 - DRIVE MOTORS The drive motor shall be rated 460 Volts, 3-phase, 60 Hz, 3/4 hp minimum, 1.800 rpm, horizontal, TEFC, with a 1.00 service factor. Motor shall comply with this specification in all other respects and all other reference specifications. 4.0 - SPARE PARTS AND SPECIAL TOOLS The following spare parts and special tools shall be furnished. All parts and tools shall be suitably marked and boxed for shipment and storage.ITEM 4.1 - ACCESSORIES
4.2 - EQUIPMENT IDENTIFICATION PLATE A 16 gauge type 316 stainless steel identification plate shall be securely mounted on all equipment in a readily visible location. The plate shall bear the 1/4 inch die-stamped equipment number indicated in this specification and shown on the drawings. Stamped equipment shall include the mechanism drives and the torque switch devices. 5.0 - WORKMANSHIP General - All parts of all equipment shall be amply proportioned for all stresses that may occur during fabrication, shipment erection and intermittent or continuous operation. Workmanship shall be of high grade in all respects. 5.1 - PAINTING Shop and finish painting shall be in accordance with, and as specified in section PAINTING _______. 5.2 - FIELD TESTS Functional Test - Prior to tank start-up, all equipment shall be inspected for proper alignment, quiet operation, proper connection and satisfactory performance by means of a functional test. Any deficiencies in alignment, operation, connection and satisfactory performance shall be corrected prior to manufacturer's certification. 5.3 - MANUFACTURER'S
CERTIFICATION The supplier or his representative shall certify the correctness of the installation. 5.4 - PREPARATION FOR
SHIPMENT Equipment shall be prepared and protected for shipment and shipped a follows. Insofar as is practical, the equipment specified herein shall be factory assembled into components as large as may be practically shipped, in order to minimize field assembly requirements. The parts and assemblies that are of necessity shipped unassembled, shall be packaged and tagged in a manner that will protect the equipment from damage and facilitate the final assembly in the field. Generally, unpainted machined parts shall be protected from damage by the elements with the application of a strippable protective coating. Provide all lubricants required for initial lubrication. There will be no storage allowed in the plant warehouse. 5.5 - GENERAL Payment for the work in this section will be included as part of the lump sum bid amount stated in the Proposal. |
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|
|
29233 106th Street East • Little Rock • CA 93543 • PH: 661 944-0855 • FX: 661 944-0813 • Email: info@polytechcorp.us
