Procurement Services SVC East Fowler Avenue Tampa, Florida (813)

Transcription

1 Procurement Services SVC East Fowler Avenue Tampa, Florida (813) Web Address: October 12, 2018 Invitation to Bid No. Entitled: MH Cooling Tower #5 Replacement Project Due Date: October 16, 2018 at 3:00 p.m. Addendum No. 5 Review the following changes/additions/clarifications to Invitation to Bid (ITB) No MH Replace Cooling Tower #5 to be addressed in submitted proposals: Below are a list of updates to the Project Drawings for ITB MH. Supplemental instructions to venders pertaining to project Specification Section : Reference the original Specification Section and replace it in its entirety with the attached Specification Section The revisions are high lighted.

2 SECTION RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS PART 1 - GENERAL SUMMARY Section Includes: Metal conduits, tubing, and fittings. Nonmetal conduits, tubing, and fittings. Metal wireways and auxiliary gutters. Boxes, enclosures, and cabinets. PART 2 - PRODUCTS METAL CONDUITS, TUBING, AND FITTINGS Listing and Labeling: Metal conduits, tubing, and fittings shall be listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application. Rigid Steel Conduit (RSC): ANSI C80.1, UL 6; heavy wall galvanized steel LFMC (Liquidtight Flexible Metal Conduit): with UL 360. Flexible steel conduit with PVC jacket and complying Fittings (couplings, conduit bodies, connectors and bushings): NEMA FB 1, UL 514B; steel; threaded; connectors with double locknuts and steel insulating bushings, thermoplastic insulating bushings for conduits 2 and smaller; conduit bodies cover: cast steel, with stainless steel screws and neoprene gaskets. Fittings Manufacturers: Cooper Crouse-Hinds; Carlon Electric Products/Prime Conduit Inc.; O-Z/Gedney; Appleton; Hubbell NONMETALLIC CONDUITS, TUBING, AND FITTINGS Listing and Labeling: Nonmetallic conduits, tubing, and fittings shall be listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application. RNC (Rigid Nonmetallic Conduit): Schedule 80 PVC, complying with NEMA TC 2 and UL 651 unless otherwise indicated. Solvent cements and adhesive primers shall have a VOC content of 510 and 550 g/l or less, respectively, when calculated according to 40 CFR 59, Subpart D (EPA Method 24). BOXES, ENCLOSURES, AND CABINETS General Requirements for Boxes, Enclosures, and Cabinets: Boxes, enclosures, and cabinets installed in wet locations shall be listed for use in wet locations. Junction Boxes: Manufacturer: Hoffman Catalog No. A606NFSS or approved equal. Nominal Dimensions: 6 H x 6 W x 4 D Shall be NEMA 4X, 16 gauge, 304 stainless steel with hinged cover and stainless steel screw down clamps. Seams continuously welded and ground smooth. Seamless foam-in-place gasket.

3 Cooling Tower Fan VFD and Condenser Water Pump VFD Enclosure with Air Conditioning Units: Manufacturer: Hoffman Watershed or approved equal. Free-standing enclosure shall be manufactured from 12 gauge Type 304 stainless steel with seams continuously welded and ground smooth. Nominal dimensions: 74 H x 75 W x 24 D for cooling tower fan VFD enclosures, and 90 H x 75 W x 36 D for condenser water pump VFD enclosures. Three point latching operated by Type 316L padlocking stainless steel handles. Seamless foam-in-place one-piece gasket. 20-degree sloped top and door edges. Provide conductive back panel. Air Conditioning Units (Provide two per Cooling Tower Fan VFD Enclosure) Manufacturer: SpectraCool Model G521246G102 or approved equal Outdoor model without heat package, stainless steel Type 4X. Nominal dimensions: 20 W x 54 H x 12 D Partially recessed mounting. Cooling Capacity: BTU/Hr (3516 Watts) Electrical: 460 Volts, 3.5 Amps, 3 phase Cooling Tower Control Panel Enclosure with Air Conditioning Unit: Manufacturer: Hoffman Catalog No. CSD483616SSST or approved equal. Wall mounted enclosure shall be manufactured from 14 gauge Type 304 stainless steel with seams continuously welded and ground smooth. Nominal dimensions: 48 H x 36 W x 16 D Provide conductive back panel. Stainless steel quarter-turn latches furnished with flush slotted insert. Air Conditioning Unit Manufacturer: SpectraCool Model N280416G102 or approved equal. Outdoor model without heat package, stainless steel Type 4X. Nominal dimensions: 28 H x 12 W x 14 D Cooling Capacity: 4000 BTU/Hr (1172 Watts) Electrical: 115 Volts, 10 Amps, single phase PART 3 - EXECUTION RACEWAY APPLICATION Outdoors: Apply raceway products as specified below unless otherwise indicated: Exposed Conduit, Aboveground (subject to exposure to sunlight): Schedule 80 PVC. Coat with gray UV resistant paint. Exposed Conduit, Aboveground (not subject to exposure to sunlight, i.e. within cooling tower basin under or within the cooling towers): Schedule 80 PVC. Coordinate with USF Project Manager. Underground Conduit: RSC. Minimum size shall be ¾. Connection to Vibrating Equipment (Including Transformers, Electric Solenoid, or Motor-Driven Equipment): LFMC approved for the application and subject to USF Project Manager and USF Physical Plant Department approval. Underground Raceways Warning Tapes 6 wide by thick polyethylene film with aluminum coil detectable tape with appropriate label: Tape color red with label Caution Electrical Line Below Minimum Raceway Size: 3/4-inch trade size. Raceway Fittings: Compatible with raceways and suitable for use and location.

4 Rigid Steel Conduit: Use threaded rigid steel conduit fittings unless otherwise indicated. Comply with NEMA FB Flexible Conduit: Use only fittings listed for use with flexible conduit. Comply with NEMA FB Do not install nonmetallic conduit where ambient temperature exceeds 120 deg F. INSTALLATION Comply with NECA 1 and NECA 101 for installation requirements except where requirements on Drawings or in this article are stricter. Comply with requirements in Division 26 Section "Hangers and Supports for Electrical Systems" for hangers and supports. Arrange stub-ups so curved portions of bends are not visible above grade. Install no more than the equivalent of three 90-degree bends in any conduit. Support within 12 inches of changes in direction. Install conduits (concealed or exposed) parallel or perpendicular to major structural elements. Support conduit within 12 inches of enclosures to which attached. Threaded Conduit Joints, Exposed to Wet, Damp, Corrosive, or Outdoor Conditions: Apply listed compound to threads of raceway and fittings before making up joints. Follow compound manufacturer's written instructions. Raceway Terminations at Locations Subject to Moisture or Vibration: Use insulating bushings to protect conductors including conductors smaller than No. 4 AWG. Terminate threaded conduits into threaded hubs or with locknuts on inside and outside of boxes or cabinets. Install bushings on conduits 3/4 to 1-1/4-inch trade size and insulated throat metal bushings on 1-1/2-inch trade size and larger conduits terminated with locknuts. Install pull wires in empty raceways. Use polypropylene or monofilament plastic line with not less than 200- lb tensile strength. Leave at least 24 inches of slack at each end of pull wire. Cap underground raceways designated as spare above grade alongside raceways in use. Label all spare conduits with origin. Surface Raceways: Install surface raceway with a minimum 2-inch radius control at bend points. Secure surface raceway with screws or other anchor-type devices at intervals not exceeding 48 inches and with no less than two supports per straight raceway section. Support surface raceway according to manufacturer's written instructions. Tape and glue are not acceptable support methods. Flexible Conduit Connections: Comply with NEMA RV 3. Use a maximum of 72 inches of flexible conduit for recessed and semi-recessed luminaires, equipment subject to vibration, noise transmission, or movement; and for transformers and motors. INSTALLATION OF UNDERGROUND CONDUIT Direct-Buried Conduit: Excavate trench bottom to provide firm and uniform support for conduit. After installing conduit, backfill and compact. Start at tie-in point, and work toward end of conduit run, leaving conduit at end of run free to move with expansion and contraction as temperature changes during this process. Firmly hand tamped backfill around conduit to provide maximum supporting strength. After placing controlled backfill to within 12 inches of finished grade, make final conduit connection at end of run and complete backfilling with normal compaction. Underground Warning Tape: Provide underground warning tape 24 above raceway, or 12 below grade if conduit is buried 24 below grade.

5 Electrical branch circuit raceways shall have minimum of 36 cover (burial depth). END OF SECTION Note: Please note receipt of this addendum by signing and returning with your proposal response Authorized Signature & Date Print Name Company Name