ADDENDUM NO. 3 DAYTON WASTEWATER TREATMENT FACILITIES AERATION SYSTEM IMPROVEMENTS 15% SBE PARTICIPATION April 28, 2014 TO ALL BIDDERS: This addendum is issued to clarify and/or modify the specifications and contract documents for the titled project. This addendum, including all articles and corrections listed below, shall be taken into account in preparing the “Proposals” and shall become part of the Contract except as noted. All bidders are requested to attach this Addendum to the Bid Form and return portions to the City as noted below. This Addendum No. 3 includes: Pages AD3-1 through AD3-4 (must be attached to Bid Form). Appendix A – Sulzer ABS Clarification Letter (one page). CHANGES TO SPECIFICATIONS AND CONTRACT DOCUMENTS 1. SECTION 11570 – HIGH SPEED SINGLE STAGE CENTRIFUGAL BLOWER A. 2. Page 11570-21, paragraph 2.08 A.2.h. Delete the word “Professional” from the first paragraph. APPENDIX A – SULZER-ABS HIGH SPEED TURBO COMPRESSOR PROPOSAL (DATED 03/14/2014) A. Add the attached manufacturer’s letter to Appendix A updating delivery information in proposal. CHANGES TO CONTRACT DRAWINGS 1. Drawing M103 – SECTION AND DETAILS A. Add the following note to this drawing: “3. Valves and electric actuators to be provided and installed by Contractor for the aeration basins are shown on drawing E200. These valves are overhead, centerline greater than 8 feet above the walkway.” Stephen Finke, Assistant Director Department of Public Works Addendum No. 3 Page AD3-1 B. Add the following note to this drawing: “4. In addition to the air valves and related actuators, the Contractor shall supply 20 electric actuators for the Owner to install per specification Section 15100, paragraph 2.04.” 2. Drawing E103 – COMPRESSOR BUILDING ELECTRICAL SUBSTATION DETAIL. A. Add the following notes to this drawing: “Notes: 1. Electrical equipment including transformer shown demolished, shall be removed and properly disposed of by the Contractor. Contractor shall have the dielectric fluid tested for PCBs prior to disposal to confirm that fluid does not contain them. 2. Owner will be given the opportunity to salvage some parts from CB-MCC-1 prior to its removal and disposal by the Contractor.” Stephen Finke, Assistant Director Department of Public Works Addendum No. 3 Page AD3-2 QUESTIONS BY CONTRACTORS The following questions have been posed by potential bidders for this project. The clarifications are provided for information only and are not made part of the Contract Documents. Where necessary, modifications to the Contract Documents have been made by addenda. 1. I intend to bid on the above mentioned project and I noticed in the specifications, 15012 2.04 T, and 15020 1.03 3 , that the successful bidder is to supply engineered drawings for the structural design of the stainless piping, and the pipe support systems. If the project is installed as shown on the drawings would engineered drawings still be required? Please advise. CLARIFICATION: Yes, Contractor shall have responsibility for the design of piping support system as specified in Section 15020, Paragraph 2.01. As noted on the Contract Documents on Sheet M102, Note 2, all pipe supports are not shown and detailed on the Contract Documents with Contractor responsible of design of pipe supports in accordance with the Contract Documents. See clarifications provided in Addendum No. 2. 2. On a recent visit to the water treatment facility, I was unable to locate “existing J-Box 25” within the compressor building. There were some pallets in the general area, which could have been covering it up, but I wanted to find out if this junction box and the conduits routing through it has been confirmed? Note 9 on sheet E101 states “asbuilt drawings indicate that existing junction box 25 is installed in the area…” CLARIFICATION: Addressed in Addendum No. 2 (showed updated location) 3. Is the blow off piping to be type A stainless or carbon steel? None of the blow off piping is noted either way on the drawings. Please advise. CLARIFICATION: The blowoff piping is air piping and shall be stainless steel; addressed in Addendum No. 2. 4. Would the attached Bray Valve be an acceptable equal to Pratt or Mueller? CLARIFICATION: At this point in the bid process, alternative manufacturers are not being evaluated. Proposed substitutions shall follow the City’s specification requirements after award of contract. 5. The BFV spec for process air butterfly valves is unclear. Section 2.02, excerpt below, asks for an AWWA, EPDM seated BFV. It also asks for stainless body with Teflon seats. The latter part of this spec section suggests the use of industrial high performance BFV rather than a cast bodied AWWA BFV with EPDM seats. Please clarify the requirements. Using the cross sectional drawing view, we are unable to Stephen Finke, Assistant Director Department of Public Works Addendum No. 3 Page AD3-3 identify if the manual valves are at a height that require chainwheels. Can you clarify if chainwheels are required? Spec section 2.03 H – This spec section calls for electric actuator motors to be fit with AC Squirrel cage motors. For smaller ¼ turn valve applications, electric actuator designs most commonly use DC motors. Rotork model IQT and IQTM (modulating version) are suitable for all the valves to be automated on this project. However, the IQT and IQTM both use DC motors, and do not require class H insulation for the modulating version. H class insulation is not an option for the DC motors. In spec section 2.03.A. 1 &2, the spec is allowing the Limitorque model QX actuator. It also uses a DC motor. We request confirmation that the Rotork Models IQT and IQTM be also approved for use. Also, we request the squirrel cage motor requirement be deleted, as well as the H class insulation for the modulating build actuator spec. CLARIFICATION: BFV specification clarification was provided in Addendum No. 2. Chains are required for valves over 6’ above floor. Air inlet piping is below this, discharge piping is above this (see drawing sections). Electric actuators shall be 480 volt/3 phase as specified in Section 15100 paragraph 2.03. Stephen Finke, Assistant Director Department of Public Works Addendum No. 3 Page AD3-4 Sulzer ABS USA 140 Pond View Drive Meriden, CT 06450 Phone (203) 238 2700 Fax (203) 238 0738 www.sulzer.com April 25, 2014 Mr. Scott Phipps, PE Hazen & Sawyer 150 E. Campus View Boulevard Suite 133 Columbus, OH 43235 Subject: Dayton AWTP Delivery Qualification Dear Scott This letter addresses the delivery qualification for the 4 (four) HST40 units as specified for this project: Quote #2013-283-Rev3A cited our standard delivery time of 26-28 weeks EX Works. Actual delivery time is affected by the production and therefore is determined/confirmed at the time of release to manufacturing. At present, our order HST order levels are far higher than when this was originally quoted. Improvement steps are underway including the opening of a new state of the art production facility in Karhula Finland which has more than doubled the capacity of our factory in Lappeenranta. Based on current production loading during the new factory start up, current deliveries are temporarily running behind our normal/standard lead times. We fully understand the critical impact of delivery on this very important project/client…and have commitment from our Corporate Management Team that, once the order is released for production, it will have an EX Works delivery closer to our standard. The bid date is May 1, 2014 and obviously there are no purchase contracts signed – but if we had a letter of intent from the City of Dayton we could start the submittal process upon receipt of the LOI, save time therefore shortening the approval process so the release to production can be advanced…in addition to the aforementioned production prioritization. The very worst case delivery is based on current factory loading, i.e. 41 weeks EX works delivery (plus transit time) – but we have a high level of confidence and offer a firm commitment to Hazen and Sawyer and the City of Dayton that we will exert our best efforts once we receive a formal release to production to reduce the delivery time and deliver the blowers closer to the quoted lead time vs. the worst case scenario disclosed above. Should you have any questions please contact Dave Parsons. Sincerely, David R. Parsons Product Manager High Speed Turbocompressors James R. Torony V.P. – Engineering, Technical Services & Sales Cc: Tom Schaefer – Hazen & Sawyer, Dave Berthiaume – Sulzer|ABS, Ray Wilkey – Southern Sales
© Copyright 2024 ExpyDoc
