PWS_Missisquoi_NWR_Geothermal_HVAC.pdf

Rev 2/7/2023 Missisquoi NWR HVAC Piping Upgrades

Performance Work Statement Missisquoi NWR, Swanton, Vermont

HVAC Piping Upgrades

1.0 Introduction and Overview

Missisquoi National Wildlife Refuge (NWR) requires the upgrade of piping insulation and the heat exchanger associated with the geothermal HVAC system at the Visitor Center/Office building. The upgrades require removal and replacement of rusting piping and accessories, including a plate and frame heat exchanger, and installing new piping insulation. The work is located in the first floor Mechanical Equipment Room. The project is intended to prevent condensation, mold growth, and increase the performance of the HVAC system.

The work is located at 29 Tabor Road, Swanton, Vermont, 05488. For a site visit to observe and evaluate the scope of work, contact Ken Sturm, Refuge Manager at telephone 802 868-4781, extension 3236.

Attached to this document are pictures of the existing conditions, for informational purposes only. A site visit is required to assess the existing conditions and full scope of work at the site.

1.1 Scope of Work

The Contractor shall meet with the Refuge Manager, visit the building, assess the situation, and provide a proposal to furnish and install the required piping upgrades. The scope of work to be performed is as follows

A. Replace all rusting steel pipe hangers, scrape and paint (or replace if necessary) all rusting pipe flanges and fittings, on the existing well water and chilled water piping.

B. Pressure test well water and chilled water piping systems to test for leaks, prior to re-insulation.

C. Insulate all well water piping, valves, fittings, including a completely sealed continuous vapor barrier jacket.

D. Repair or replace all sections of chilled water piping insulation that are missing, stained, or where vapor barrier is compromised.

E. Scrape clean, paint, and properly insulate the chilled water pumps.

F. Replace severely rusted chilled water air separator and provide insulation.

G. Replace severely rusted plate and frame heat exchanger and provide insulation.

1.2 Period of Performance

The work shall be completed in 120 days from notice to proceed.

1.3 Project Safety

The Contractor shall be responsible for strict compliance with all provisions of Occupational Safety and Health Administration (OSHA) requirements 29 CFR 1910 and 29CFR 1926 during the performance of the work.

2.0 Project Requirements

A. All work and materials shall be in compliance with all applicable building codes, and the following applicable performance standards:

1. American Society of Mechanical Engineers (ASME)

2. American Society for Testing Materials (ASTM)

3. National Electric Code (NEC)

4. American Society of Heating, Refrigerating and Air Conditioning Engineers Standard 90.1

2019 (ASHRAE)

6. International Building Code 2018 (IBC)

7. International Energy Conservation Code 2021 (IECC)

B. Install the insulation and equipment in strict accordance with manufacturer's installation instructions, and in accordance with State and local code requirements.

C. The bidders are required to visit the site to review the existing equipment and determine the full scope of the work involved. The Government will request proposals for this project. To receive award as a result of a Request for Proposal (RFP) or Request for Quotes (RFQ), the potential offerors shall register their organization in the System for Award Management (SAM) at SAM.gov.

D. The contractor shall submit a written cost and technical proposal for consideration before the due date and time for this RFP/RFQ. The contractor shall submit a cost breakdown of materials and labor as part of the cost proposal. The contractor shall submit the proposal electronically.

E. Field Measurements: On site field investigation and measurements shall be made prior to procurement of the materials, to ensure that the proposed materials will fit the conditions of the installation.

F. Appurtenant work

1. The Contractor shall be licensed in the State of Vermont to perform all the required work and obtain the required permits.

2. The new materials and installation shall meet the performance requirements of the original design drawings and specifications. See the Appendix for the original piping insulation and plate and frame heat exchanger specifications. The complete original HVAC design drawings and specifications are available from the Contracting Officer.

3. Install the new heat exchanger in the same location as the existing, and make any required piping modifications.

4. Contractor shall provide all required adjustments or materials so the HVAC system will properly function when work is completed. Provide and install all incidental materials required.

5. Upon completion of the installation, HVAC system shall be fully operational. Perform startup and testing operations with the presence of Refuge personnel.

3.0 Material Submittals

A. Material submittals consisting of manufacturer's product information, specifications, and installation procedures, shall be provided for Government approval before any materials are ordered or installed on this project.

4.0 End Results/Deliverables

A. Provide and install all materials required to properly complete the scope of work. Upon completion of the installation, the HVAC system shall be fully operational. Provide all Operations and Maintenance Manuals to the Refuge, including warranty information on the parts.

B. Upon completion of the project, all work areas shall be free from rubbish and debris.

5.0 Inspection and Acceptance

A. The Government reserves the right to inspect any and all phases of the work performed under this Contract and will conduct a final inspection prior to acceptance of the work. The Contractor shall notify the COR/Refuge Manager at least five business days prior to scheduling the final inspection. Provide all Operations and Maintenance Manuals, and training in routine maintenance to assure expected service life.

B. Evaluation and Acceptance will be determined by the COR/Refuge Manager.

C. The Contractor shall take special care to protect Government property and the existing mechanical systems. In the event of damage to Government property as a result of work performed under this Contract, the Contractor shall return areas damaged to their original condition, to include painting, refinishing, or replacement, if necessary.

Appendices:

Photographs (For information only. A site visit is required to assess the full scope and working conditions at the site of the project.)

Original Mechanical Insulation Specifications Original Plate and Frame Heat Exchanger Specifications Original Mechanical Schedules, Sheet 47 (see plate and frame selection)

UNINSULATED PUMPED WELL WATER SUPPLY

UNINSULATED WELL WATER SUPPLY

RUSTING WELL WATER PIPE HANGER

RUSTING WELL WATER PIPING HANGERS

UNINSULATED WELL WATER CONTROL VALVES

UNINSULATED WELL WATER RETURN PIPING, AND RUSTING PLATE AND FRAME

HEAT EXCHANGER

RUSTING PLATE AND FRAME HEAT EXCHANGER

POORLY SEALED CHILLED WATER PUMP INSULATION AND RUSTING PIPE

FLANGES

UNINSULATED RUSTING CHILLED WATER AIR SEPARATOR

VAPOR BARRIER FAILURE AT CHILLED WATER PIPE HANGER

EXAMPLE OF WELL SEALED VAPOR JACKET ON CHILLED WATER PIPE

INSULATION

EXAMPLE OF PROPERLY SEALED VAPOR JACKET ON PIPE FITTING AND AT PIPE

HANGER SADDLES

EXAMPLES OF PROPERLY JACKETED INSULATED PIPE ELBOWS

ORIGINAL MECHANICAL INSULATION SPECIFICATIONS

ORIGINAL PLATE AND FRAME HEAT EXCHANGER SPECIFICATIONS

ORIGINAL MECHANICAL SCHEDULES, SHEET 47 (SEE PLATE AND FRAME HEAT

EXCHANGER SELECTION)