Diffused Aeration Piping Equipment

1.0 General 1.1. The specifications in this section include all components of the Diffused Aeration System with the exception of the individual diffuser units. Refer to additional specification sections for diffuser unit specification. 1.2. The complete aeration system shall be supplied by the Aeration Diffuser Manufacturer to maintain single source responsibility for the system. The complete system shall be defined as beginning at the top flange of the air supply drop pipes through all submerged piping, wall brackets, lateral supports, expansion joints, diffusers and any other equipment specified within this section of the specifications. The approved manufacturer for this system to be included within the Base Bid shall be manufactured by Tideflex Technologies, Inc. Pittsburgh, PA 412-919-0919. Any other submittals intended as equivalent or alternate must be submitted prior to the Bid Date and be pre-approved by the Engineer prior to Bid opening. 2.0 Referenced Standards ASTM A240 Chromium-Nickel Stainless Steel Plate ASTM A380 Corrosion Protection, Acid Pickling ASTM A480 Stainless Steel Finish ASTM A530 Specialized Carbon and Alloy Steel Pipe ASTM A554 Welded Stainless Steel Mechanical Tubing ASTM A774 Stainless Steel Welded Fittings ASTM A778 Stainless Steel Welded, Unannealed Austenitic Pipe ASTM D1171 Elastomer Deterioration ASTM D1784 PVC/CPVC Pipe Compounds ASTM D1785 PVC Pipe, Schedules 40, 80 & 120 ASTM D2466 PVC Solvent Cement ASTM D2855 PVC Solvent Joints ASTM D3915 PVC Pipe Fitting Compounds AISI 304 304 Stainless Steel Plate AISI 304L 304L Stainless Steel Plate AISI 316 316 Stainless Steel Plate AISI 316L 316L Stainless Steel Plate ANSI B-16.1 Pipe Flanges ANSI B-16.5 Pipe Flanges 3.0 Stainless Steel Pipe Materials 3.1. All stainless steel pipe supplied shall conform with the associated referenced standards as listed in the section Referenced Standards. 3.2. All stainless steel pipe components shall be passivated by complete immersion in nitric-hydrofluric acid as specified in the associated referenced standard as listed in the section Referenced Standards. Print Date: 06/27/05 11379.0-1

3.3. If the stainless steel stock pipe has been previously passivated prior to welding, as defined in the previous section, an acceptable alternative to re-immersion of the complete welded assembly shall consist of the following procedures: 3.3.1. Wire brush all welded joints to remove burrs and excess residual debris. 3.3.2. Liberally apply a coat of OAKITE 33 (phosphoric acid based passivating solution) at 50% concentration or immerse in the same at a concentration of 25% volume to all welds for a minimum period of 30 minutes. 3.3.3. Rinse the OAKITE 33 solution completely from the manifold or fabricated part with warm water after the curing period. Immediately towel dry the surface and inspect. 3.3.4. Repeat the procedure until all free residuals and discoloration is eliminated. 3.3.5. OAKITE 33 conforms to the following Federal Government Specifications: TT-C-490, Method VI, and MIL-C10578, Type 1. Mfg. By Oakite Products, Inc. P.O Box 602, 50 Valley Rd., Berkley Heights, NJ 07922 800-526-4473 4.0 Vertical Piping Support Brackets 4.1. All components of the bracket assembly shall be 304 stainless steel. 4.2. The components of the bracket assembly shall be 304 stainless steel. 4.3. The assembly support bracing shall be anchored to the concrete wall with drill and tap expansion anchors, the pull-out rating of the combined anchors shall be a minimum of 10 times greater than the static weight of the vertical pipe section. 4.4. All welded structural components of the assembly shall be passivated in accordance with the section Stainless Steel Pipe Materials. 5.0 Lateral Piping Support Brackets 5.1. All components of the bracket assembly shall be 304 stainless steel. 5.2. Support brackets shall allow for a minimum of 2 adjustment in elevation of the lateral pipe. 5.3. Assembly components shall consist of two riser type clamps minimum width of 2.00 and minimum thickness of 0.190, two all-thread rods minimum diameter of 0.625, one neoprene strip minimum 0.125 thick with a length equivalent to the lateral pipe circumference, and stainless steel lock nuts with integral nylon ring. Riser clamps shall provide a Print Date: 06/27/05 11379.0-2

minimum of 0.0625 of compression of the neoprene strip when assembled around the lateral piping. 5.4. Threaded rods shall be anchored to the concrete floor using Epoxy type anchors. 6.0 Stainless Steel Welding 6.1. All welding of pipe and structural support members shall be conducted at the factory using TIG, MIG, inert gas or plasma-arc welding methods. 6.2. Field welding will not be permitted without the approval of the Engineer. 6.3. All welded components shall be passivated in accordance with the specifications defined in this section. 6.4. Weld cross-sections shall have a thickness equal to or greater than the welded material. 6.5. All butt welds shall be fully penetrated with gas shielding to the interior and exterior of the joint. 6.6. All face rings and flanges shall be continuously welded on both sides unless lap joint flanges are specified. 6.7. All welding practices shall be in accordance with the referenced standards listed in the section Referenced Standards. 7.0 Polyvinyl Chloride (PVC) Pipe 7.1. All PVC pipe and PVC pipe fittings shall be a minimum schedule 40. 7.2. SDR 33.5, sewer drainage pipe or plastic pipe with a sidewall thickness less than schedule 40 will not be accepted for any portions of the piping material. 7.3. PVC pipe compounds shall be in accordance with the standards listed in the section Referenced Standards. 7.4. PVC solvent and solvent joints shall be in accordance with the standards listed in section Referenced Standards. Field solvent welding will not be allowed unless approved by the Engineer or if field pressure testing is required within these specifications. 8.0 Vertical, Air Supply Piping 8.1. Vertical air supply piping shall be a minimum of Schedule-10 304 stainless steel. Print Date: 06/27/05 11379.0-3

8.2. Lap Joint type (follower flange) plate flanges shall be provided at the top end of the pipe section, flanges shall be in accordance with ANSI bolt hole diameters and spacing. 8.3. Each drop pipe shall be equipped with a stainless steel lifting lug capable of sustaining twice the static weight of the drop pipe assembly. 8.4. Stainless steel bolts, nuts and neoprene gasket shall be provided for field connection of each vertical pipe to the non-wetted field routed air supply piping at the top of the tank. 9.0 Lateral, Air Distribution Piping 9.1. Lateral air distribution piping shall be a minimum of schedule 40 PVC in accordance with the specifications for PVC pipe as listed in the section Polyvinyl Chloride (PVC) Pipe. 9.2. All PVC lateral pipe components shall be completely submerged during normal system operation. Any portions that would be exposed to atmosphere during normal operation must be a minimum of Schedule-10 304 stainless steel. 10.0 Pipe Joints 10.1. All pipe joints that are to be field connected shall be either flanged or threaded union type. No ball and socket, slip-on or compression fit joints will be accepted when joining PVC to PVC. 10.2. Flanged connections shall be in accordance with ANSI bolt diameter and hole spacing standards. Flange material shall be either stainless steel or PVC to match the associated pipe material. Bolts and nuts shall be a minimum of 304 stainless steel. Gasket material shall be neoprene or EPDM elastomer. 10.3. Threaded union connections shall be a minimum schedule 40 PVC with EPDM internal o-ring. Threaded connections will only be allowed for pipe diameters of 4 and less. 6 pipe diameter and greater shall be a flanged connection. 11.0 Pipe Clean-Outs 11.1. Pipe clean-outs shall be provided at the end of each lateral distribution pipe. 11.2. For PVC pipes a transition coupling, socket x FIPT, with a threaded plug with square nut shall be provided. The diameter of the transition piece and plug shall be equal to the lateral pipe diameter. All fittings shall be a Print Date: 06/27/05 11379.0-4

minimum schedule 40 PVC. 11.3. For stainless steel lateral piping, a flange and blind flange plate shall be provided at the end of each lateral pipe. Stainless steel bolts, nuts and neoprene gasket shall be provided. 12.0 Expansion Joints 12.1. Expansion joints shall be provided at the end of each vertical air supply piping at the transition point to the lateral distribution piping. 12.2. The joint shall be a stainless steel compression type with a minimum length of 6 and fully gasketed at 6 long by ½ thick neoprene or PGR and have a pressure capacity of 50 psi. 12.3. The expansion joint shall be capable rated for a minimum operating pressure of 50 psi and a maximum temperature of 250 F. 13.0 Diffuser Connection Assemblies 13.1. Diffusers shall be connected to the lateral distribution piping or saddle assembly by an NPT threaded connection. 13.2. PVC distribution piping shall have a removable type saddle fitted with an FIPT thread. Saddle assemblies not providing a threaded connection for the diffusers will not be accepted. 13.3. The diffuser saddle assembly shall be constructed of PVC schedule 40, with an independent top section and bottom section which are to be connected together around the manifold piping by means of (4) 304SS bolts. The bottom section must be equipped with a stem extension which extends into the port hole on the manifold to prevent against rotation of the saddle on the manifold pipe. The stem extension must include a recessed ring and equipped with an EPDM elastomer ring gasket for sealing the outlet port. The saddle must be rated to 150 psi pressure capacity. Saddles with eccentric compression wedge closure mechanisms and fabricated of PVC Type II material will not be accepted (due to the effects of expansion and contraction by thermal differentials upon this grade of PVC) unless the Contractor provides one additional replacement saddle assembly for every individual saddle provided. 14.0 Airflow Monitoring Equipment 14.1. The Aeration System manufacturer shall provide pressure differential assemblies consisting of 316 stainless steel pitot tubes, magnehelic gauge, pressure tubing, conversion chart, and Nema-4X enclosure with handrail mounting hardware as specified within the specifications section titled Airflow Indication Equipment. Print Date: 06/27/05 11379.0-5

15.0 Delivery, Storage, and Material Handling 15.1. Individual diffuser units shall be packaged separately and wrapped in protective plastic or packaging paper separate from the piping equipment. 15.2. All flanges shall be protected by using plastic inserts or plank wood, pipe sections are to be fully supported to prevent pipe deflection or damage to fittings or connections. 15.3. All equipment shall be shipped on pallets capable of fully supporting the pipe sections across their entire length. Pallets should be accessible for fork lift transport or strap and hoist means without causing any load to the pipe equipment. 15.4. All stainless steel components shall be stored separately away from any carbon steel components or other materials which could stain or deface the stainless steel finish from run-off of oxidized ferrous materials. 15.5. All pipe equipment should be covered and stored in areas free from contact with construction site sediment erosion to prevent accumulation of materials within pipe threaded connections. 15.6. Diffuser membranes should be protected from contact with rigid objects during handling and storage. The contractor shall be responsible for replacing any diffuser membranes or elastomer components which are damaged after arrival on the site through installation and start-up of the system. 16.0 Submittals 16.1. System Installation Drawings 16.1.1. The aeration equipment manufacturer shall be responsible for providing engineering installation drawings of the complete aeration system supplied by the manufacturer. These drawings shall include plan view piping arrangement, sections and elevations as required, support bracket installation details, diffuser orientation details, and all dimensions required for locating the system within the specified dimensions of the tank. 16.1.2. Drawings shall be a minimum of 11 x 17 inches. 16.1.3. Six (6) sets of plans shall be provided to the Engineer for review and approval. Print Date: 06/27/05 11379.0-6

16.1.4. Two (2) sets of final fabrication and installation drawings shall be included with the shipment of aeration equipment. 16.2. Installation, Operation and Maintenance Manuals 17.0 Installation 16.2.1. Within 30 days of final approval of the installation drawings, by the Engineer, the aeration manufacturer shall provide four (4) sets of the installation portion of the Installation, Operation and Maintenance (IOM) Manuals for the applicable aeration system. Within 30 days of final approval, by the Engineer, of the installed aeration system the aeration manufacturer shall provide six (6) copies of the complete Installation, Operation and Maintenance (IOM) Manual for final review and approval. 16.2.2. The manuals shall be in the following format and include the listed required information as a minimum: Enclosed in separate binders with project title and system designation shown on the front cover. Table of contents. Copy of Process calculations for aeration system (as developed by aeration manufacturer). Copy of complete set of installation plans. Parts and equipment list with specification numbers for ordering of replacement parts. Product specification sheets for diffusers, expansion joints, expansion anchors, flow metering equipment and any other specialized items supplied with the system. Installation guidelines for the aeration system and individual diffuser units. Operational procedures for the aeration system. Guidelines for repair of system components. Schedule for suggested periodic maintenance of the aeration system. 17.1. Installation of the aeration system shall be in accordance with the guidelines provided by the aeration manufacturer as specified in the installation section of the IOM manual. Refer to section on Submittals for quantities and delivery schedules of the documents. 18.0 Start-Up and Testing Procedures 18.1. Start-up and testing procedures of the aeration system shall be in accordance with the guidelines provided by the aeration manufacturer as Print Date: 06/27/05 11379.0-7

19.0 Warranty 11379.0 Diffused Aeration Piping Equipment specified in the installation section of the IOM manual. Refer to section on Submittals for quantities and delivery schedules of the documents. 19.1. All piping, support brackets, saddle assemblies, joint connections, expansion joints, and anchors shall be warranted by the aeration manufacturer against failure under design conditions for a period on one (1) year from the date of final installation and field testing certification. End of Section Contact Valve and Equipment for Microsoft Word Versions of this document Valve & Equipment Consultants, Inc. 24116 Yoakum St Huffman, TX 77336 Phone: 281-324-1500 Fax 281-324-4595 Email: sales@valveandequipment.com Web Site: www.valveandequipment.com Print Date: 06/27/05 11379.0-8