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8645 Scope of WorkPage 1 of 9 Technical Specification For the Purchase of: GALVANIZED STEEL STRUCTURES FOR SUBSTATIONS RFP #8645 I. PURPOSE The purpose of this specification is to provide information necessary for prospective suppliers to prepare a proposal for fabricating and delivering standardized galvanized steel structures for use in Denton Municipal Electric (DME) 138kV substations in accordance with structural design and fabrication drawings provided by DME. The owner is seeking proposals for both tubular steel structures and square tube & I-beam steel structures as shown on the pricing sheet and described later in this section. Proposers may bid on one or both sections of the pricing sheet. A price is required for each unit independently. DME will award the contract for tapered tubular structures to a single fabricator and the contract for all other structures to a single fabricator. This does not preclude any fabricator from submitting proposals for both types of structures. DME’s objective in structuring the proposal in this way is to utilize standard structures for all substation projects to the extent possible. DME has developed standard substation structure drawings. These standard structures will be used to construct multiple stations. As such, pricing is requested to fabricate these standard steel structures on a unit price basis that can be used for multiple orders over time. The drawing package provided for this RFP is for one substation project to illustrate how the structures will be used. The estimated quantities shown on the pricing sheet will be used for evaluating the proposal. These quantities are not the quantities that will be required to construct the station described in the drawings. The work items required by this specification are to fabricate, assemble to the extent feasible, and deliver the galvanized steel structures, anchor bolts, anchor bolt templates, and assembly bolts as described in the structural design and fabrication drawings. Structural design and fabrication drawings supplied with this proposal are believed to be accurate and final; however, final drawings will be issued for fabrication. Any fabrication drawing errors discovered shall be promptly reported to DME for resolution. Structural assemblies shall be factory assembled to the fullest extent possible consistent with shipping limitations. The drawings indicate the extent of assembly expected. Should the steel order be received in an assembly state other than as indicated on the drawings, an amount will be deducted from the supplier’s final invoice to cover the cost of the owner’s time for that assembly unless some other arrangements are proposed and accepted by DME. The proposal is structured to have the steel separated into units as follows and as detailed in the drawings: A. Tapered Tubular Structures and Anchor Bolts 1. 65-OHSM01 – 65’ overhead shield wire pole Technical Specification for Purchase of Galvanized Steel Structures RFP #8645 Page 2 of 9 2. 40-TOS02 – 138kV H-frame transmission termination structure 3. LB01 – light bracket for tapered tubular structures 4. F1 – anchor bolts and template for H-frame takeoff structures 5. F6 – anchor bolts and template for 65’ overhead shield wire poles B. Square Tube and I-Beam Structures and Anchor Bolts 1. 15-3PBS01 – 13.2 kV three-phase bus support 2. TOS01 – 24.9kV 3-phase bus support 3. TOS02 – 24.9kV main breaker switch structure 4. TOS03 – 24.9kV distribution structure 5. TOS04 – 24.9kV URD Riser Structure 6. 138-1PLCTP01 – 138kV single-phase CT pedestal 7. 138-1PHCTP01 – 138kV single-phase high CT pedestal 8. 138-1PPTP01 – 138kV single-phase PT pedestal 9. 138-1PSSVTP01 - 138 kV single-phase SSVT pedestal 10. 138-1PHBP01 – 138kV single-phase high bus pedestal 11. 138-1PLBP01 – 138kV single-phase low bus pedestal 12. 138-HBDS01 – 138kV high bus disconnect switch stand 13. 138-LBDS01 – 138kV low bus disconnect switch stand 14. TOS05 – Transformer bar grating and supports 15. 138-EV201 – 138kV EV2 switch outrigger 16. BK1 – Bracket BK1 for adjustable mounting 17. BPSG01 – bearing plate for building foundations 18. 1” diameter x 3’6” L anchor bolts 19. Template TP3 – template for FD02 foundations 20. Template TP6 – template for FD03 foundations 21. Template TP7 - template for FD12 foundations It is intended that the agreement include a fair and equitable price adjustment mechanism for changes in delivery costs, steel prices, etc., over the term of the agreement. Steel structure units shall be priced shipped FOB to sites designated by DME. All delivery sites will be inside or very near the city limits of Denton, Texas. Partial shipments will be acceptable provided that all materials for each unit are included on the same shipment. The pricing sheet has lines to for the vendor to propose pricing adjustments should modifications in structure heights become necessary for a particular project. This proposal is intended to supply all the substation steel that Denton Municipal Electric (DME) will require for a five-year period. The agreement(s) will be structured as an initial three-year contract with options to extend the contract for two additional one year periods. There shall be no minimum purchase required by the agreement. Estimated annual quantities shown on the pricing sheet are the best estimates available at this time. Actual orders may vary significantly up or down in any year. Individual purchase orders will be issued for each order. It is not guaranteed that order releases will be for entire substation packages at the same time. Project scheduling requires that the anchor bolts and anchor bolt templates be delivered in advance of the structures. This will be a factor in award. Technical Specification for Purchase of Galvanized Steel Structures RFP #8645 Page 3 of 9 DME will provide labor and equipment for unloading at the site, for field assembly, and for installation. Technical questions, drawings, and post award transmittals may be directed to DME. II. SERVICE CONDITIONS A. Site Location: The service and delivery location for the galvanized steel structures, anchor bolts and hardware assemblies will be at project specific locations in and around the city of Denton, Texas. B. Service Elevation: Approximately 640 feet above sea level. C. Temperature: -20o F to 120o F. D. Other Considerations: Moderately humid climate with 20 to 40 inches of rain per year; wind up to 90 mph; thunderstorms with severe lightning occurring in all months of the year with the greatest frequency during the warmer months. III. PROPOSAL ADDITIONAL INFORMATION In addition to the requirements stated in the RFP document, the following information shall be provided: A. Assembly Limitation Exceptions: Describe any items that will not be assembled and shipped in accordance with the fabrication drawings. An evaluation amount will be added to the cost unit if the fabricator proposes to provide the steel in a state of assembly less than that called for on the fabrication drawings. This increased price will be used when determining lowest cost. B. Cancellation: The City reserves the right to cancel the steel purchase at any point prior to the start of the fabrication process. If the City awards the substation steel structure proposal and subsequently must cancel the purchase, the City will reimburse the manufacturer for actual documented costs incurred up to the date of cancellation. These costs would typically include engineering, material handling, storage, and price of materials that cannot be reused. All material that cannot be reused shall become the property of and be delivered to the City of Denton. C. Freight Charges for the Steel: All steel and any other material shall be shipped FOB to the substation sites with freight prepaid and allowed as a part of the bid price. No separate freight charges will be accepted. IV. TECHNICAL TERMS AND CONDITIONS A. Definitions: The terms “owner”, “utility”, “purchaser”, “Denton Municipal Electric”, “DME”, or “City of Denton” as used herein shall designate the City of Denton, Texas dba Denton Municipal Electric. The terms “bidder”, “vendor”, “supplier”, “seller”, “distributor”, “representative”, “contractor”, “fabricator”, or “manufacturer” shall designate anyone submitting a proposal; and, subsequently, anyone to whom the contract is awarded. The term “engineer” shall be understood to refer to Denton Municipal Electric or its designated representative, hereafter referred to as DME. Technical Specification for Purchase of Galvanized Steel Structures RFP #8645 Page 4 of 9 B. Detail Design: Detailed structural design and the fabrication drawings were prepared by the Owner’s engineers. All clearances and spacings were designed to conform to National Electrical Safety Code, ANSI and NEMA standards. Any fabrication drawing errors discovered shall be promptly reported to DME for resolution. C. Omissions or Errors: It is the intent of this specification to require the supplier to provide the steel and other hardware necessary to construct the steel structures for the station that are equipped and featured appropriately to perform and operate in accordance with the drawings and specifications. Further it is the intent of this specification to require that the steel be fabricated, as a minimum, in accordance with all US standards that apply to steel structure manufacture and testing. Omission of any minor details from this specification, minor mistakes or typographical errors in text, or mistakes in attempting to reference standards or data in the standards shall not relieve the supplier from the responsibility to furnish all material or equipment necessary to make the steel structure fully functional as described and intended herein. Every effort has been made to insure the accuracy and correctness of all drawings. It shall be the responsibility of the supplier to verify correctness and accuracy of drawings as a part of the proposal. The owner will resolve problems brought to his attention, and revised drawings will be issued. Should errors be discovered after a contract is awarded, the price for the order will be adjusted up or down based on the average price per pound for the total order if corrections result in a total steel weight change of 1% or more. D. Steel Delivery Schedule: The supplier shall indicate on the Proposal the proposed schedule in weeks after receipt of order (ARO) to ship the steel structures. E. Drawings and Appendices: All drawings, maps, and other documents contained in appendices, exhibits, or otherwise accompanying this specification or listed herein shall be considered a part of this specification. The following is a list of the types of supporting drawings: Electrical Drawings Steel Erection Drawings Steel Detail Drawings Foundation Drawings F. Addition of Standard Units During the Contract Term: The owner may, from time to time, have to define additional standard construction units. The owner and fabricator will agree on the price for any additional standard units needed. In establishing the price for additional standard units, pricing shall be based on the per unit steel price (e.g. price per pound) for similar structures unless the fabricator can demonstrate quantifiable reasons for deviating. The pricing sheet has a place for the supplier to provide an average price per pound for additional structures. G. Pricing Adjustments for Structure Modifications: Should it become necessary to modify a standard unit in such a way that the weight is increased, or decreased, changes in price shall be based on the change in steel weight. The owner expects the fabricator to allow minor alterations in drilling or in the locations or dimensions of brackets to be permitted at no additional charge provided that changes are made prior to fabrication. Technical Specification for Purchase of Galvanized Steel Structures RFP #8645 Page 5 of 9 H. Guarantee: The supplier shall guarantee that all steel and hardware furnished shall be new and free from defects in materials, workmanship, and shall give successful service under the specified operating conditions. The supplier shall also agree upon notice from the owner to promptly and without charge, and to the satisfaction of the owner make such changes, repairs, replacements, corrections, etc. which may be required to make good any defect discovered for a minimum period of twelve (12) months from the date of steel erection or eighteen (18) months from the date of delivery, whichever comes first. The manufacturer shall respond to all issues within three days of being notified when DME or its contractor discovers fabrication errors to determine a course of action and establish a time for replacement or repair. I. New Materials and Workmanship: Only new materials shall be used in fabrication of the steel structures. Damaged or defective materials shall not be repaired and used. No peening, caulking, or filling shall be permitted in repairing cracks, pinholes, or blowholes. Such defects in fabricated steel shall be repaired by chipping out welds to the bottom of the vee and re-welding. J. Verification of Assembly Part Matching: Where size prohibits the shipment of complete assemblies, the equipment shall be shop assembled, fitted, match marked, if appropriate, then dismantled for shipping. The purpose of this is to verify that all parts of the assembly have been properly designed, fabricated and will fit together. K. Manufacturing Inspection: The owner shall have the right to inspect the work on, and materials for, the steel at all reasonable times. Such inspections shall be at no additional cost to the owner. Inspections, with or without comment, shall not relieve the supplier of the requirement for conformance to the specification nor shall they be construed as acceptance of work not in accordance with the intent of this specification. L. Shipment and Delivery: Steel and other hardware purchased under this agreement shall be shipped by open flat bed truck to the delivery location specified by DME. Proposals for rail shipment will not be accepted. All shipments shall be FOB to the substation sites with freight prepaid and allowed. Partial shipments will be acceptable provided that all materials for each unit are included on the same shipment. Bolts and small items will be boxed for shipment. The containers shall be marked with the contents and location of where they fit and how they fasten. 1. Unloading: DME will unload all material at the Substation site. The supplier shall be responsible for all remedies for damage caused to equipment during shipment. 2. Delivery location: It is intended that all shipments be delivered to the Substation sites. The owner reserves the right to change the delivery location up to the time of shipment. Because Denton Municipal Electric’s service area is within limited area in and around the City of Denton, no allowance will be made for cost differences resulting from a destination change. 3. Notice of factory shipments: The owner will unload the steel and other hardware at the substation site. Because of the size of the steel sections, coordination and equipment will be necessary for unloading. The supplier shall provide notices 5 days prior to the expected shipping date and on the actual shipping date. The truck driver or manufacturer shall provide notice on a normal City of Denton workday at Technical Specification for Purchase of Galvanized Steel Structures RFP #8645 Page 6 of 9 least 24 hours prior to expected delivery. Contact Sam Bridges at (940) 390-6279 for notices of shipment. Secondary contact is Brian Walding at (940)-390-3146. Any delays that result from failure of the manufacturer or driver to provide the required advance notice will be the responsibility of the supplier. Messages can be left 24 hours a day with the DME Operations Center dispatcher at 940-349-7000; however, leaving a message after normal work hours or on a weekend or a City of Denton holiday shall not constitute proper delivery notice. Delivery of the steel and other hardware will be accepted only between the hours of 8:30 am and 1:00 pm, Monday through Friday, excluding holidays. The base proposal shall include the cost for the delivery truck to wait until DME unloads the steel. 4. Assembly: Factory assembly of the steel structures for shipping shall be in accordance with the fabrication drawings. 5. Damaged or defective material or equipment: Freight that is obviously damaged on arrival will be refused. Any necessary action regarding replacement of materials or equipment delivered in unacceptable condition shall be the responsibility of the supplier, including concealed freight damage. The supplier shall be fully responsible for all action necessary for replacement or repair of such damage in a timely manner. V. DESIGN STANDARDS All steel structures shall be manufactured to meet or exceed the clearances and other requirements in the latest revision of all USA standards that are applicable to galvanized steel structure manufacture. Applicable standards shall include at least those of ASTM, NEMA, IEEE, and ANSI. In the event that the owner, in this specification, has incorrectly referenced a standard or a requirement, test, or test value contained in a standard, such an error shall not relieve the manufacturer of the requirement to comply with the standard or to perform tests properly and in the manner prescribed in the applicable standards. The materials shall conform to the latest issue of the following ASTM Specifications: A. Structural Steel Pipe & Tubes – A-500, Grade B B. Structural Steel Shapes, Plates, Channels, Angles – A-36 C. High Strength Bolts – A-325 D. Heavy Hex & Nuts – A-563, Grade C E. Flat Washers – F-436 VI. STEEL STRUCTURES DETAILED SPECIFICATION The steel fabricator shall use the supplied fabrication drawings for steel manufacturing and assembly. The steel manufacturer will not be responsible for fabrication design or drawing issues, except that the manufacturer shall advise DME of design or drawing errors or other problems prior to fabrication. DME will resolve design or drawing issues. A. Bolts and Nuts: Field connections, where a fastening device is required, shall be bolted. Galvanized bolts shall conform to the latest edition of ASTM Designation A-325, galvanized nuts shall conform to the latest edition of ASTM Designation A-563, Grade C Technical Specification for Purchase of Galvanized Steel Structures RFP #8645 Page 7 of 9 and galvanized flat washers shall conform to the latest edition of ASTM Designation F- 436. All bolts, nuts and flat washers shall be hot dipped galvanized in accordance to ASCM A-153. The manufacturer shall provide all bolts, nuts, flat washers, and pal-nuts for field assembly. A 5 percent excess quantity of all hardware type shall also be provided to insure no shortages during field assembly. Anchor bolts and templates for all structures will be provided by the vendor according to the foundation drawings included with the drawing set. Quantities and sizes specified will be strictly adhered to unless otherwise directed by the owner. Any discrepancies discovered shall be brought to the attention of the owner and remedied as soon as possible. B. Galvanizing: All structural steel, bolts, inserts, bracing members, miscellaneous plates, and steel fasteners shall be hot-dip galvanized AFTER fabrication unless otherwise specified herein or as agreed to by the owner in writing. All closed or blind sections shall be properly vented to permit the escape of gases or vented as otherwise required by the Manufacturer’s galvanizer. Material used for galvanizing structural members and methods of applications shall conform to ASTM A123. All items shall be hot-dipped galvanized both inside and outside after fabrication. Parts bolted together shall be galvanized before final assembly. Bolts, nuts, and flat washers shall be galvanized in accordance with ASTM A153. Galvanizing on anchor bolts shall extend a minimum of 4 inches below the threads. Nuts shall be tapped after galvanizing to allow easy hand assembly of bolt/nut. C. Handling: Each structure component shall be fabricated so it can be placed in its final position atop its foundation or support through use of a crane and normal rigging without risk of damage to that structure or any of its integral components. All lattice trusses, girders, columns, column extensions, peaks, and brackets shall be shipped assembled according to the fabrication drawings. D. Electrical Equipment Mounting Plates: Steel structures are required to have mounting adaptations fabricated to mount the several different types of substation hardware. The following is a list of certain hardware items that are not a part of this proposal but that must be mounted onto the steel sections. The steel fabrication drawings reflect the required arrangements. Insulators: NEMA TR289 SSVT’s PT’s CT’s Lightning Arresters GOAB Switches Flood Lights E. Marking: Each piece shall be stamped with a permanent identifying mark using a 3/8 inch die before galvanizing. The stamp shall be on the topside of column bottom base Technical Specification for Purchase of Galvanized Steel Structures RFP #8645 Page 8 of 9 plates and at concealed surfaces of beam top-column connections. Only pieces, which are identical and interchangeable, may carry the same piece mark designation. The die stamp marking shall be easily readable after galvanizing. Manufacturer’s convenience marking by stenciling, marking or paint pen is allowed but only if applied to areas, which will be concealed after structure erection. Do not use marking pen or stenciled paint on exposed surfaces of erected steel. F. Fabrication: Workmanship and finish of all metalwork specified under this section shall be of the highest grade and equal to the best practice of modern shops for the respective work. Fabrication shall conform to the latest revision of the AISC “Specification for Structural Steel Buildings”. The manufacturer shall make adequate tests and inspections to determine that the material furnished is strictly in accordance with this specification. Bolt holes shall be located precisely to ensure that the bolts will be normal to the plane of the connections. Bolt holes shall be made 1/16-inch larger than the nominal diameter of the bolts. Exposed surfaces shall have smooth finish and sharp, well-defined lines. All drilled, punched, or cut edges shall be deburred, ground flush, or otherwise provided without torn or ragged edges. All members shall be free from twists or bends. Beam-to- column mating surfaces shall have any excess accumulation (runs/drips) of previously molten zinc filed away to produce a smooth, uniform surface. G. Welding: The techniques of welding employed, appearance and quality of weld made, and the methods of correcting defective work shall conform to “Codes for Arc and Gas Welding and Building Construction” of the AWS and to AISC Specifications. All welders shall have a current certificate of qualification from the AWS. Surfaces to be welded shall be free from loose scale, rust grease, paint, and other foreign material, except that mill scale that will withstand vigorous wire brushing may remain. A light film of linseed oil may likewise be disregarded. Finished members shall be true to line and free from twists. Manufacturer shall use jigs, two-piece opposing grain weld up (particularly valuable for tapered columns), or other means to minimize warping and twisting in the finished product. Grind welds smooth on exterior exposed surfaces where necessary for subsequent member attachment. Any use of preheating shall be in accordance with AWS recommendations. VII. ASSEMBLY Structural assemblies shall be factory assembled to the fullest extent possible consistent with shipping limitations. If structures are not shipped assembled according to the drawings, an assembly penalty will be assessed and deducted from the final invoice. The penalty shall consist of the actual time spent by DME personnel to field assemble the unassembled structures. An evaluation penalty will be added to the proposal price if the fabricator takes exception to the assembly prescribed in the drawings. The manufacturer shall verify the fit of all field bolted devices. If errors that prevent proper field assembly are not discovered and corrected prior to shipment, the manufacturer shall be responsible for correcting such problems at his expense. Technical Specification for Purchase of Galvanized Steel Structures RFP #8645 Page 9 of 9 VIII. FIELD DRILLING DME will invoice the manufacturer should it be necessary to complete more than four (4) hours of field drilling to correct fabrication errors. Billing will be for any time required in excess of four (4) hours. IX. QUALIFIED STEEL FABRICATORS Only steel fabricators who have demonstrated their capability to fabricate substation steel structures of the type shown on the drawings will be considered. The manufacturer shall have been engaged in complete fabrication of identical or very similar structures to those specified herein for at least the past five (5) years.