TARRANT COUNTY PURCHASING DEPARTMENT

Transcription

1 JACK BEACHAM, C.P.M., A.P.P. PURCHASING AGENT TARRANT COUNTY PURCHASING DEPARTMENT JANUARY 24, 2017 BID NO ADDENDUM #1 ROB COX, C.P.M., A.P.P. ASSISTANT PURCHASING AGENT TARRANT COUNTY DICK ANDERSEN BUILDING HVAC REPLACEMENT 1. Change(s): BIDS DUE FEBRUARY 2, 2017 A. The due date for this Bid as been changed to February 2, 2017 at 2:00 p.m. 2. Questions and Responses: A. Questions received by the due date and their responses are included in this Addendum #1 on the following page(s). 3. Clarifications: A. Additions and changes/modifications from Baird, Hampton & Brown, Inc. are included in this Addendum #1. This Addendum #1 must be signed and the original and one (1) copy must be returned with Bid! NAME AND ADDRESS OF COMPANY: AUTHORIZED REPRESENTATIVE: Signature Name Title Tel. No. Address Fax No: TARRANT COUNTY ADMINISTRATION BUILDING, SUITE E. WEATHERFORD, FORT WORTH, TEXAS (817) , (817) [FAX]

2 TARRANT COUNTY DICK ANDERSEN BUILDING HVAC REPLACEMENT QUESTIONS AND RESPONSES 1. What are the plans for supplemental cooling/heating for the building during the equipment replacement? It will take some time to remove the existing air handler, modify the housekeeping pad and let it cure, install the new air handler, install the new boiler and connect piping, duct, controls, etc. and I want to make sure that we can accommodate the requirements that Tarrant County may have on this project. Response: The Contractor shall include in their bid temporary heating and cooling as necessary to maintain areas affected by construction at 68 during winter and 72 during summer. 2. What hours will we be allowed to work? Response: The building will be available from 7:00 A.M. to 11 P.M. seven days per week. Tarrant County will make available personnel during this time as requested for work to be. All work to be performed during normal business hours shall be performed as quietly as possible so as to minimize impact to ongoing business operations. The Contractor shall schedule any loud demolition or loud construction work accordingly. BID NO PAGE 2 OF ADDENDUM #1 01/24/2017

3 January 23, 2017 Danny Roberson Tarrant County Senior Contracts Administrator, Operations 100 E. Weatherford, Ste 303 Fort Worth, Texas RE: ADDENDUM NO. 1 DICK ANDERSEN BUILDING HVAC REPLACEMENT BID NO Mr. Roberson, After the pre-bid meeting on Wednesday, January 18, 2017 at the jobsite, there were a few questions submitted by Contractors that we have answered below. In addition, we have some changes and additions to the Specifications and some clarifications included with this addendum as well. SPECIFICATIONS 1.1 Section HYDRONIC SPECIALTIES A. Paragraph 2.8, B: Add sub-paragraphs 4 and 5 to read as follows: 4. Armstrong 5. Bell & Gossett ITT; Fluid Handling Div. 1.2 Section HVAC PUMPS QUESTIONS A. Add specification section in its entirety as attached. 1.4 Question #1: What are the plans for supplemental cooling/heating for the building during the equipment replacement? It will take some time to remove the existing air handler, modify the housekeeping pad and let it cure, install the new air handler, install the new boiler and connect piping, duct, controls, etc. and I want to make sure that we can accommodate the requirements that Tarrant County may have on this project. A. The Contractor shall include in their bid to provide temporary heating and cooling as necessary to maintain areas affected by construction at 68 F during winter and 72 F during summer. 1.5 Question # 2: What hours will we be allowed to work? A. The building will be available from 7:00 A.M. to 11 P.M seven days per week. Tarrant County will make available personnel during this time as requested for work to be. All work to be performed during normal business hours shall be performed as quietly as possible so as to minimize impact to ongoing building operations. The Contractor shall schedule any loud demolition or loud construction work accordingly Ridglea Place, Ste 700, Fort Worth, Texas Tel: Fax: TBPE Firm #44 TBPLS Firm #

4 ADDENDUM No. 1 Dick Andersen Building HVAC Replacement Fort Worth, Texas BHB Project Number January 23, 2017 CLARIFICATIONS 1.6 Tarrant County staff will remove the fence immediately surrounding the existing condensing unit near the Northeast corner of the building. 1.7 Roofing work shall be performed by Jeff Eubanks Roofing, 1900 Northpark Drive, Fort Worth, TX 76102, and shall be supervised as stipulated in the SHEET NOTES on SHEET M2.1 of the Construction Documents. Page 2 of 2

5 SECTION HVAC PUMPS PART 1 - GENERAL 1.1 SUMMARY A. Extent of HVAC pumps work required by this section is indicated on drawings and schedules, and by requirements of this section. B. Types of pumps specified in this section include the following: 1. Vertical In-Line. 2. Frame-Mounted End Suction. 1.2 QUALITY ASSURANCE A. Manufacturer's Qualifications: Firms regularly engaged in manufacture of general use centrifugal pumps with characteristics, sizes and capacities required, whose products have been in satisfactory use in similar service for not less than 10 years. B. Codes and Standards: 1.3 SUBMITTALS 1. HI Compliance: Design, manufacture, and install HVAC pumps in accordance with HI "Hydraulic Institute Standards". 2. UL Compliance: Design, manufacture, and install HVAC pumps in accordance with UL 778 "Motor Operated Water Pumps". 3. UL and NEMA Compliance: Provide electric motors and components that are listed and labeled by Underwriters Laboratories and comply with NEMA standards. A. Product Data: Submit manufacturers pump specifications, installation and start-up instructions, and current accurate pump characteristic performance curves with selection points clearly indicated. B. Shop Drawings: Submit manufacturer's assembly-type shop drawings indicating dimensions, weight loadings, required clearances, and methods of assembly of components. C. Wiring Diagrams: Submit manufacturer's electrical requirements for power supply wiring to HVAC pumps. Submit manufacturer's ladder-type wiring diagrams for interlock and control wiring. Clearly differentiate between portions of wiring that are factory-installed and portions to be field-installed. D. Maintenance Data: Submit maintenance data and parts lists for each type of pump, control, and accessory; including "trouble-shooting" maintenance guide. Include this data, product data, shop drawings, and wiring diagrams in maintenance manual; in accordance with requirements of Division 01. BHB Project No /23/2017 HVAC PUMPS

6 1.4 PRODUCT DELIVERY, STORAGE, AND HANDLING A. Handle HVAC pumps and components carefully to prevent damage, breaking, denting and scoring. Do not install damaged HVAC pumps or components; replace with new. B. Store HVAC pumps and components in clean dry place. Protect from weather, dirt, fumes, water, construction debris, and physical damage. PART 2 - PRODUCTS 2.1 PUMPS A. General: Provide factory-tested pumps, thoroughly cleaned, and painted with one coat of machinery enamel prior to shipment. Type, size, and capacity of each pump is listed in pump schedule. Provide pumps of same type by same manufacturer. 2.2 VERTICAL IN-LINE PUMPS A. General: Provide vertical in-line pumps where indicated, and of capacities as scheduled. B. Type: Vertical mount, in-line, close-coupled, single stage, designed for 175 psi working pressure. C. Body: Cast iron, 125 psi ANSI flanges of equal size, tappings for gauge and drain fittings. D. Shaft: Carbon or stainless steel with replaceable shaft sleeve. E. Seal: Mechanical seal with ceramic seal seat. F. Motor: Non-overloading at any point on pump curve, open, drip-proof, ball bearings, 15,000 hours bearing life, with lifting lug on top of motor. G. Impeller: Bronze, enclosed type, hydraulically and dynamically balanced, keyed to shaft and secured with locking screw. H. Manufacturer: Subject to compliance with requirements, provide vertical in-line pumps of one of the following: 1. Armstrong. 2. ITT Bell & Gossett. 3. PACO Pumps. 4. TACO, Inc. 2.3 FRAME-MOUNTED END SUCTION PUMPS A. General: Provide frame-mounted end suction pumps where indicated, and of capacities and having characteristics as scheduled. BHB Project No /23/2017 HVAC PUMPS

7 B. Type: Horizontal mount, single stage, vertical split case, flexible coupling, base mounted, designed for 175 psi working pressure. C. Casing: Cast iron, 125-psi ANSI flanges, tappings for gauge and drain connections. D. Shaft: Steel with replaceable shaft sleeve. E. Bearings: Regreasable ball bearings. F. Seal: Mechanical, with carbon seal ring and ceramic seat. G. Motor: Open, drip-proof, regreasable ball bearings. H. Impeller: Bronze, enclosed type, hydraulically and dynamically balanced, keyed to shaft and secured with locking screw. I. Baseplate: Structural steel with welded cross members, and open grouting area. J. Drip Lip Base: Provide a drip lip base for chilled water pumps. The drip lip shall be constructed of minimum 10-gauge steel and shall extend a minimum of 2 inches beyond the companion flange to the pump flange. K. Coupling: Flexible, capable of absorbing torsional vibration, equipped with coupling guard. L. Manufacturer: Subject to compliance with requirements, provide frame-mounted end suction pumps of one of the following: 1. Armstrong. 2. ITT Bell & Gossett. 3. PACO Pumps. 4. TACO, Inc. PART 3 - EXECUTION 3.1 INSPECTION A. Examine areas and conditions under which HVAC pumps are to be installed. Do not proceed with work until unsatisfactory conditions have been corrected. 3.2 INSTALLATION OF PUMPS A. General: Install HVAC pumps where indicated, in accordance with manufacturer's published installation instructions, complying with recognized industry practices to ensure that HVAC pumps comply with requirements and serve intended purposes. B. Access: Provide access space around HVAC pumps for service as indicated, but in no case less than that recommended by manufacturer. BHB Project No /23/2017 HVAC PUMPS

8 C. Electrical Wiring: Install electrical devices furnished by manufacturer but not specified to be factory-mounted. Furnish copy of manufacturer's wiring diagram submittal to Electrical Installer. D. Verify that electrical wiring installation is in accordance with manufacturer's submittal and installation requirements of Division 26 sections. Do not proceed with equipment start-up until wiring installation is acceptable to equipment installer. E. Piping Connections: Refer to Division 23 HVAC piping sections. Provide piping, valves, accessories, gauges, supports, and flexible connections as indicated. 3.3 ADJUSTING AND CLEANING A. Alignment: Check alignment, and where necessary, realign shafts of motors and pumps within recommended tolerances by manufacturer, and in presence of manufacturer's service representative. B. Start-Up: Lubricate pumps before start-up. Start-up in accordance with manufacturer's instructions. C. Refer to Division 23 section "HVAC TESTING, ADJUSTING AND BALANCING for pump system balancing; not work of this section. D. Cleaning: Clean factory-finished surfaces. Repair any marred or scratched surfaces with manufacturer's touch-up paint. END OF SECTION BHB Project No /23/2017 HVAC PUMPS