Attachment_1-CRT-00003-7J_SOW_20180420.pdf

Project: CRT-00003-7J

Repair Heating System

Bldg. 1848

SCOPE OF WORK

(20 April 2018)

1. The Contractor shall provide all labor, fittings, equipment, components, mounts, devices, accessories, transportation, and storage as required to perform all work in accordance with these specifications, commercial practices and industry standards. All work shall be accomplished in accordance with applicable federal, state, and local regulations.

2. The Contractor shall accept directions only from the Regional Contracting Office- Alaska

(RCO-AK) Contracting Officer (KO). Requests or desires of the users or using agency made directly to the Contractor will be immediately brought to the attention of the KO, and the

Contracting Officer’s Representative (COR) if applicable. Any changes to the project scope or other provisions of the SOW must be authorized in writing by the KO.

3. Project Description. The existing heating system in building 1848 in the Donnelly Training

Area (DTA) is not providing adequate heat for the facility. The contractor will replace the existing three section boiler with a five section unit and replace the two existing overhead unit heaters with four new heaters. The following tasks fully describe the work to be performed;

a. General; Work shall be performed strictly in accordance with equipment manufacturer’s installation recommendations and in accordance with the following codes & standards:

a. International Mechanical Code

b. National Electric Code

c. SMACNA Duct Construction Standards, Metal and Flexible

d. ASME B31.9 Building Services

e. NFPA 31, Installation of Oil Burning Equipment

f. NFPA 211, Standard for Chimneys, Fireplaces, Vents, and Solid Fuel Burning

Appliances

b. Demolition;

1. Demolition shall include the existing boiler, flue vent, combustion air intake ductwork, air separator, expansion tank, circulation pump, unit heaters and associated piping, supports, valves, appurtenances, controls and electrical power unless otherwise specified.

2. The existing office and restroom baseboard terminal units and associated supply/return piping and thermostat shall be retained and incorporated into the new heating system.

The point of connection between the new and existing baseboard piping shall be within the boiler room, coordinated with the new work. The existing baseboard isolation, drain and zone control valves within the boiler room shall be replaced with new.

3. The existing radiant floor heating system including existing controls, thermostats, radiant manifolds, zone circulators and supply/return piping shall be retained and incorporated into the new heating system. The point of connection between the new and existing radiant floor piping shall be within the boiler room, coordinated with the new work. The existing radiant system drain and isolation valves within the boiler room shall be replaced.

4. The existing glycol solution shall be completely drained from the entire heating system, including the in-floor radiant tubing and glycol make-up tank, captured and disposed of off-site in accordance with applicable federal, state and local regulations.

The Contractor is responsible for disposal.

c. New Work;

1. Provide a new commercial sectional cast iron boiler complete with burner, controls, safeties, pressure & temperature gauge, drains, and all necessary appurtenance for a complete installation installed in accordance with the boiler and burner manufacturer’s recommendations and applicable codes. Provide a Burnham V905A boiler or approved equal. The basis of design boiler was chosen to match the existing make and series of boiler so as to fit within the existing space constraints. Provide boiler with isolation valves.

2. The boiler shall be installed with the manufacturer recommended service clearances on all sides unless otherwise approved. Minimum clearances to combustible materials shall be maintained. Boiler shall be provided with a support stand. Maintain a clear access aisle in front of the boiler for passage of future replacement laundry equipment located within the room. The existing boiler stand may be modified to fit the new boiler dimensions or a new stand may be provided.

3. The existing fuel supply oil system from the existing exterior above ground storage tank to the existing fusible shutoff and isolation valve shall be retained for reuse. The existing fuel oil shut off valve shall be the point of connection for new work. Provide a new recirculating fuel deaerator designed for use with #1 and #2 fuel oil. Provide

Tiger Loop or approved equal, and provide a new filter and supply and return hoses between the fuel deaerator and the burner.

4. Provide a new boiler flue venting system in accordance with the manufacturer’s recommendations and per applicable code, suitable for use with a forced draft commercial boiler. Provide a positive pressure rated, UL Listed, double wall with air gap or insulation, stainless steel, modular prefabricated boiler venting system with all necessary appurtenances, rain cap, storm collar, fittings, supports and vented thimbles for a complete assembly. Size shall be coordinated with requirements of the boiler manufacturer and layout shall be coordinated with existing conditions. Provide Selkirk

Commercial Model PS, IPS or approved equal. If during boiler start-up and tuning it is determined the vent is contributing to a surplus negative pressure that adversely effects boiler tuning, then provide a barometric damper to reduce the negative vent pressure and maintain the manufacturer’s recommended positive pressure at the boiler flue outlet. Install new vent from boiler breeching to above roof line, maintaining manufacturer’s recommended and code required clearances to combustible materials and adjacent sloped roof.

5. Boiler burner shall be tuned in accordance with manufacturer’s recommendations.

Deviations in nozzle, fuel pressure, fire box pressure, breach pressure from those recommended by the manufacturer shall be approved by the Government. Following successful boiler start-up and tuning, provide a posted instruction indicating installed nozzle type, fuel pressure, fire box/breach pressures, air band settings, and combustion data (CO2/smoke/efficiency).

6. The existing combustion air inlet, including the exterior hood, wall opening, interior duct and interior duct openings, shall be modified and/or replaced as necessary to provide for a combustion air opening in accordance with manufacturer’s recommendations and to meet code requirements. For the basis of design boiler, provide a combustion air opening to the exterior having no less than 200 in2 free area to include exterior and interior openings and duct/hood cross sectional area. The combustion air duct and hood shall be galvanized steel installed in accordance with

SMACNA Duct Construction Standards, and shall be provided with a cold air trap, which may be located interior or exterior. Provide bird screen at the hood inlet and interior duct outlets with openings no less than ¾ inch. Exterior hood inlet shall be no less than 30 inches above grade. Coordinate with existing conditions, including adjacent laundry equipment, and the new piping and equipment layout. Interior combustion air ductwork shall be insulated with 2 inch thickness fiberglass insulation with continuous all service vapor barrier jacket.

7. The existing boiler room cooling exhaust fan shall be removed and reinstalled in the existing wall opening to provide supply air to the boiler room instead of providing exhaust from the room. The existing power and thermostatic fan control shall be retained for use with reinstalled fan.

8. Provide new heating circulation pumps to serve the existing radiant floor heating system, the existing baseboard terminal units and the new unit heaters. Pump CP-1 shall serve the unit heater loop. Pump CP-2 shall serve the radiant floor heating system and the baseboard terminal units. Pumps shall be designed for use in heating systems and shall be compatible with inhibited propylene glycol. Pumps shall be provided with

ECM motors and integral speed control with AutoAdapt, FlowAdapt, Constant-

Pressure, and Proportional Pressure control settings. Pump motor shall be 120V, single phase and integrally thermally protected. Pump capacity shall be as indicated with the pump operating at no greater than 90% of maximum pump speed. Pumps shall be

Grundfos Magna3 40-120F or approved equal. Provide each pump with check valve and isolation valves.

9. Provide new heating system expansion tank sized as shown. Expansion tank shall be a captive air bladder type tank with heavy duty butyl bladder designed for 100% acceptance. Tank shell shall be carbon steel, ASME stamped and rated for 125 psi maximum pressure. Expansion tank shall be compatible with inhibited propylene glycol solutions. Provide Taco CA140-125 or approved equal. Tank may be located within the boiler room coordinated with existing conditions, new work and equipment access, however, the tank may be located outside of boiler room in an approved location, providing supporting structure is rated for the flooded weight of the tank.

Tank air charge shall be 12 psi. Verify and adjust tank air pressure prior to installation.

Provide the expansion tank with an isolation valve and system drain with hose outlet.

10. Provide an air separator as shown with high capacity automatic air vent and threaded connection for expansion tank. Air separator shall be provided without an integral strainer. Install in accordance with manufacturer’s recommendations, including length of straight inlet piping. Provide Taco 435 Air Scoop or approved equal.

11. Provide a system strainer with blowdown valve on the heating system return to the boiler. Strainer shall be a bronze Y-strainer rated for 125 psi minimum.

12. Provide four new vertical discharge hydronic unit heaters. Unit heater capacity shall be as shown, and shall be derated for nonstandard conditions and for use of glycol. Hot water/steam coils shall be rectangular, one-pass, multiple circuit, with aluminum fins mechanically bonded to tubes. Motors shall be 115V single phase, totally enclosed, provided with thermal overload protection, provided with permanently lubricated ball bearings, and shall be resilient mounted. Unit heaters shall be provided without outlet cone diffusers. Unit heaters shall be Trane Model P-202 or approved equal. New unit heaters shall be installed as high as practical and generally where shown. Coordinate final locations to place unit heaters between vehicle traffic lanes and avoid interference with vehicle traffic. Unit heater air inlet shall be no closer than 7 inches to the roof or other obstructions that would impede airflow. Unit heaters shall be supported by ½ inch all thread rod, positively attached to structure. Provide each unit heater with isolation valves, drain valve and air vent. Unit heaters do not require vibration isolation, balance valves or zone control valves.

13. Route glycol heating supply and return piping to the new unit heaters as high as practical. Branch piping to each unit heater shall connect to the bottom quadrant of the glycol supply and return mains for air control. Provide automatic air vents with isolation valves at high points, top of risers and where air can collect. Unit heater supply and return piping layout is designed to be a self-balancing reverse return system.

No deviations in pipe sizes or layout shown are permitted without prior approval by the

Government.

14. New piping shall be Type K copper tubing with soldered or brazed joints. Isolation and drain valves shall be bronze full port ball valves, Class 125 minimum. At connections between dissimilar metals, dielectric unions are prohibited. Where required, dielectric waterways (nipples) or dielectric flanges shall be used. Provide drain valve with threaded hose outlet at all low points and for each heating zone as shown. Each heating zone shall be provided with supply and return isolation valves as shown.

15. Piping outside the boiler room shall be insulated with minimum 1.5 inch thickness fiberglass insulation with all service jacket. Provide PVC fitting covers at fittings.

Exposed cut ends of insulation shall be finished with two coats of mastic with embedded glass cloth. Piping within the boiler room may remain uninsulated.

16. All piping, wiring and conduit penetrations of the boiler room walls and ceiling shall be fire stopped with a UL listed 1 hour fire rated fire stopping assembly, installed in accordance with manufacturer’s installation instructions.

17. Unit heaters shall be seismically restrained from roof structure with strut bracing. The expansion tank shall be seismically restrained to an adjacent wall by strut and seismic straps at the 1/3rd and 2/3rd tank height. The boiler shall be positively attached to the boiler stand, and the stand shall be braced to the adjacent wall with strut. The stand shall not be anchored to the floor to avoid embedded radiant tubing. Piping 3 inch and under in size shall not require seismic restraint.

18. Following installation of the new work, the entire heating system shall be flushed and cleaned in accordance with the glycol manufacturer’s recommendations with a heated

TSP solution prior to introduction of the new glycol solution. Following cleaning the

TSP solution shall be flushed and completely drained from the heating system to include the in-floor radiant heating tubing. The Contractor shall be responsible to collect the TSP cleaning and flush water and for off-site disposal in accordance with all applicable federal, state and local regulations.

19. Provide new industrial formulated 50% propylene glycol solution with corrosion inhibitor chemical package suitable for use with HVAC systems and rated to a 325F operating temperature. Solution shall be premixed with deionized or distilled water.

Provide Dowfrost HD, Arctictherm P-50 or approved equal. Leave glycol make-up tank ½ full and provide sufficient volume in the heating system to achieve a 15 psi initial cold system pressure. Provide a posted instruction at the glycol make-up tank, indicating the glycol manufacturer, type and percent concentration that has been provided.

20. The existing glycol make-up tank, pump, associated expansion tank and pressure reducing valve shall be retained and incorporated into the heating system, but may be relocated as needed in coordination with layout of new boiler room equipment and piping. Boiler pressure relief piping shall be routed to discharge into the glycol make-up tank. Provide new isolation valve at make-up connection to the heating system.

21. Provide adequate maintenance access to all new equipment including valves, controls, disconnects, pumps, boiler and all items requiring routine maintenance and inspection in accordance with manufacturer’s recommendations.

22. Provide all manufacturer’s Installation, Operation and Maintenance (IOM) instructions and warranty information in electronic format (PDF) on discs. Provide two disc copies.

23. Provide boiler and control power through an accessible fused disconnect in accordance with manufacturer’s recommendations and code requirements. Pumps and unit heaters shall be provided with an accessible power disconnect switch in proximity to the equipment in accordance with applicable code requirements.

24. The existing Tekmar radiant floor heating system controls and associated boiler control features shall be retained and adapted to the new boiler. The existing radiant floor heating system is controlled as two independent zones through two existing Tekmar

360 Mixing Control panels, which control the existing zone circulators and existing 4-way injection control valves. The Tekmar controls provide for radiant floor glycol supply temperature reset and warm weather shut down based upon existing indoor and outdoor temperature sensors. The Tekmar 360 Mixing Control, located on the building

East wall, provides for boiler enable control and boiler low return temperature protection based upon a pipe mounted boiler return temperature sensor, located within the boiler room. All existing Tekmar sensors shall be retained and adapted to the new heating system.

25. The existing office and restroom thermostats and associated low voltage wiring may be reused, however, the associated zone valves and controls transformers shall be replaced with new. New zone valves shall be selected for a terminal unit design flowrate of 1.5 gpm. Zone valves shall be provided complete with end switch, spring return and manual override capability. Provide White Rogers 1311 or approved equal. White

Rogers zone valves were selected for basis of design to match existing zone valves and controls.

26. The existing unit heater controls shall be demolished entirely and new controls shall be provided for the new unit heater and for pump control. The new unit heater zone shall be provided without zone valves.

27. Provide posted instruction indicating the final configuration settings for the Tekmar mixing control panels and label all thermostats with their initial set points.

28. The Contractor shall be responsible to provide new control devices, wiring and appurtenances and/or integrate and configure the existing controls where specified to remain to achieve the following control sequences:

a) Radiant Floor Heating & CP-2: Tekmar mixing control shall enable the respective zone circulator, mixing valve and pump CP-2 based upon the outdoor air temperature and warm weather shut down (WWSD OCC, WWSD UNOCC) set point. The occupied and unoccupied mode WWSD OCC and WWSD

UNOCC set points shall initially be set to 70F. The interior room temperature occupied and unoccupied mode set points (ROOM OCC, ROOM UNOCC) shall initially be set to 70F. The Tekmar mixing control shall modulate the 4-way control valve to maintain the radiant floor glycol supply temperature. The radiant floor glycol supply temperature shall be reset based upon outside air temperature. Configure the reset schedule based upon a design outdoor air temperature (OUTDR DSGN) of -40F, a design indoor temperature (MIX INDR) of 70F, a design supply water temperature (DSGN MIX) of 120F and a design maximum water supply temperature (MIX MAX) of 140F. The Tekmar controls shall be configured for a high mass radiant terminal unit (Terminal Unit = 1).

The Tekmar minimum supply temperature (MIX MIN) shall be set to “off”.

The Tekmar mixing control located on the building East wall shall be used for boiler control, and shall be configured with a minimum temperature allowed for the boiler target temperature (BOIL MIN) set to an initial value of 135F. For boiler protection, the existing Tekmar boiler temperature sensor shall be reinstalled on the new boiler return piping, and the East Tekmar mixing control boiler sensor DIP switch shall be set to “Return”. For boiler control the East

Tekmar mixing control panel boiler enable DIP switch shall be set to “10%

Enable”.

b) Unit Heaters & CP-1: Unit heater fans shall start and circulation pump CP-1 shall be enabled at a room temperature set point of 65F (adjustable). Unit heater fans and CP-1 shall be disabled at a room temperature set point of 70F

(adjustable).

c) Office & Restroom Baseboard Heating: Zone valves shall open in response to the respective room thermostat and circulation pump CP-2 shall be enabled to maintain a room temperature set point of 70F (adjustable).

d) Boiler: Boiler shall be provided with packaged controls to operate and maintain an 180F glycol supply temperature.

29. Testing, Adjusting and Balancing shall not be required, however, balance valves shall be provided on the baseboard terminal unit zones to allow for throttling flow to these direct return zones during system start-up.

d. The contractor will track the solid waste disposal. See the Solid Waste Reporting form included in the job packet. The contractor will turn the completed forms over to the government’s QA representative at the end of the job.

4. Anything mentioned in the Scope of Work and not shown on the drawings, or shown on the drawings and not mentioned in the Scope of Work, shall be of like effect as if shown or mentioned in both.

5. The Construction period is to be 120 days. NTP will be issued 10 days after the date the contract is awarded. The construction period includes material procurement and equipment delivery times."

6. Upon award of the contract, contractor shall meet with Facility Management staff for a Pre-

Con meeting, before beginning work. Work will only commence after the issuance of a Notice to

Proceed (NTP).

7. All work will be performed by certified personnel, as applicable. All required training and certification costs will be paid by the Contractor.

8. Contractor shall provide Quality Control. The government’s Quality Assurance (QA) individual shall work closely with the Contractor’s QC individual to ensure all contract requirements are included.

9. Sustainable Acquisition. The contractor must meet the recycled content requirements set forth by the EPA for the products listed at http://www3.epa.gov/epawaste/conserve/tools/cpg/products/, the Bio Preferred Program requirements set forth by USDA at http://www.biopreferred.gov/BioPreferred/faces/pages/ProductCategories.xhtml, and use energy-and water-efficient building-related products and equipment listed at http://energy.gov/eere/femp/find-product-categories-covered-efficiency-programs.

10. All new contractor employees, to include subcontractor employees, requiring access to

Department of Defense installations, facilities, and controlled access areas shall complete initial

Operations Security (OPSEC) training or provide proof (Certificate) of current annual OPSEC training. All contractor employees will complete annual refresher training as required by the length of the contract. The required training is available at the following:

https://securityawareness.usalearning.gov/opsec/. The contractor shall maintain certificates of completion for each employee and subcontractor employee upon employment.

11. Contractor is responsible for the costs associated with any spill of fuel or hazardous materials. If a spill occurs by the contractor, contractor must complete included “Basic Spill

Information Sheet” and make appropriate telephone notification. The “Basic spill Information

Sheet” will be included in the job packet.

13. Submittal Schedule:

Submittal Description Due

Quality Control and Safety Plan 5 days after contract award

Projected Project Execution

Schedule and Timeline

With quote

Subcontractor Personnel List with numbers and qualifications

5 days after contract award

OPSEC Training Certificate:

(See item 10)

5 days after contract award

Product data for boiler assembly 5 days after contract award

Product data for flue assembly 5 days after contract award

Product data for circulation pumps

5 days after contract award

Product data for expansion tank 5 days after contract award

Product data for hydronic heaters 5 days after contract award

ATTACHMENTS/ENCLOSURES:

Equipment Schedules

Bldg. 1848 Design Analysis

Replace heating System Bldg. 1848 Drawing

Basic Spill Hazard Information Sheet

Solid Waste Reporting March 2016

Solid Waste Work Order Insert