Billings_FS_Water_Heater_Replacement_Scope_of_Work_1.pdf

BILLINGS FIRE STATION

EASTERN MONTANA/DAKOTAS DISTRICT

BILLINGS, MONTANA

BILLINGS FIRE STATION

DOMESTIC WATER HEATER REPLACEMENT

CONTRACT SCOPE OF WORK

BUREAU OF LAND MANAGEMENT

EASTERN MONTANA/DAKOTAS DISTRICT

Billings Fire Station Domestic Water Heater Replacement Page 1 Contract Scope of Work

Domestic Water Heater Replacement Bureau of Land Management

I. Project Description

A. Project Purpose: The existing domestic water heater at the Billings Fire Station has failed and repair parts are unavailable.

B. Project Work Elements: The work of this contract consists of:

1. Replacement of the existing domestic water heater, including demolition of the existing domestic water heater; installation of a new high-efficiency water heater; reconfiguring the existing domestic water heating system piping; and reconfiguring the existing water heater vent piping.

2. Any and all electrical work required for related work elements above.

3. Demonstration and training for BLM site personnel.

C. Project Contract Type: All work shall be performed under a single contract.

II. Project Location

A. The Billings Fire Station is located at 1299 Rimtop Drive, Billings, Montana 59105 (LAT 45.805900, LONG -108.521739). A pre-bid site inspection by potential bidders to verify existing conditions at the project site is highly recommended, but not mandatory.

III. Contractor’s Use of Premises

A. Establishment of any sort of camp within the Billings Fire Station property boundaries will not be permitted.

B. The area within the work limits is mainly inside the mechanical room (Room 107) of the Billings Fire Station. The Contractor shall conduct operations at all times to ensure the least inconvenience to the site staff and shall coordinate all activities with the BLM site manager and the Contracting Officer’s Representative. Access to all areas shall be maintained for BLM administrative and other official business throughout the construction phase.

C. Confine storage of materials to within the area of the building being worked on or at exterior locations as designated by the BLM site manager and the Contracting Officer’s Representative.

D. Materials salvaged by the Contractor shall be removed from the Billings Fire Station and disposed of outside the fire station property boundaries.

Domestic Water Heater Replacement Page 2

IV. Existing Systems Description

A. General: The Billings Fire Station is a 5,200 square foot building with a mezzanine in the engine bays, constructed in 2010.

B. Existing Domestic Water Heating System: The existing domestic water heating system consists of a high-efficiency modulating-condensing water heater, domestic hot water recirculating pump and hot water expansion tank.

V. Project Work Elements

A. Drain Existing Domestic Water Heater: Shut off gas, power, cold water, and hot water supplies to existing water heater. Completely drain water heater tank.

B. Remove Existing Domestic Water Heater: Remove and dispose of the existing 100-gallon domestic water heater as shown in Figure 1 and Billings Fire Station Mechanical Room Demolition Plan SK-1 below. Disconnect existing water piping, gas piping, vent piping, combustion air piping, and electrical power from the existing water heater. Remove existing T&P relief and condensate drain piping. Remove existing 1/2” gas piping back to the 1-1/4” gas main in mechanical room. Cut existing vent and combustion air piping as shown on SK-1 below.

Remove existing cold water and hot water piping and valves as necessary to accommodate installation of the new water heater.

Figure 1 - Existing Water Heater

Remove Existing Domestic Water Heater

Domestic Water Heater Replacement Page 3

Domestic Water Heater Replacement Page 4

C. Furnish and Install New Domestic Water Heater (DWH-1): Furnish and install a new domestic water heater as shown on Water Heater Piping Schematic SK-2 and Billings Fire Station Mechanical Room New Work Plan SK-3 below. Water heater shall be modulating-condensing type suitable for firing with natural gas at high altitude, shall be rated for 160 psig working pressure, and shall be 95 percent thermally efficient, with 100 gallon glass-lined insulated tank, sea level input capacity of 150,000 BTU/hr, and 120VAC, 5A electrical characteristics. Provide the water heater with ASME temperature and pressure relief valve, condensate neutralizer kit (Part No. 100289339), seismic water heater restraint kit (Holdrite QS-120, or approved equal), and grounded power cord with plug. The water heater shall be installed in accordance with the manufacturer’s installation instructions and shall be adjusted for proper operation at 3,100’ elevation. A.O. Smith BTH-150, by A.O. Smith Corporation, Ashland City, Tennessee 37015, or approved equal. The new water heater shall be installed on the existing concrete equipment pad and shall be anchored to the wall behind the water heater with seismic restraint straps.

Domestic Water Heater Replacement Page 5

Domestic Water Heater Replacement Page 6

D. Reconnect Water Piping: Furnish and install new cold and hot water piping to the connection points on the new water heater – the existing water piping shall be modified as necessary to accommodate the new connection points. Piping shall be Type L hard drawn copper, with wrought copper solder fittings. Unions shall be dielectric type. Shutoff valves shall be bronze ball valves, full port, two-piece, with chrome plated ball. Furnish and install clevis type pipe hangers for individual pipes and unistrut type trapeze hangers for multiple pipes.

E. Furnish and Install New T&P Relief Valve Discharge Piping: Furnish and install new T&P relief valve discharge piping from the domestic water heater relief valve to the existing floor drain -relief piping shall terminate pointing down into floor drain. Piping shall be Type L copper with wrought copper solder fittings.

F. Furnish and Install New Condensate Drain Piping: Furnish and install new condensate drain piping from the domestic water heater condensate drain connection to the existing floor drain.

Condensate drain piping shall be Schedule 40 PVC with solvent-weld socket fittings. Furnish and install a condensate neutralizer (as specified under “Furnish and Install New Domestic Water Heater” above) in the condensate drain line to neutralize acid in the condensate before it reaches the floor drain.

G. Furnish and Install New Vents: Furnish and install new domestic water heater exhaust vent and combustion air piping as shown on the Billings Fire Station Mechanical Room New Work Plan SK-3 above – the existing vents shall be modified as necessary to accommodate the connection points on the new water heater. Exhaust vent and combustion air piping shall be solid-core Schedule 40 PVC with long-radius solvent-weld socket fittings – foam-core PVC piping will not be acceptable. The existing wall-mounted vent termination shall remain in place, with a stainless steel bird screen installed in the exhaust vent termination – see Figure 2 below. Horizontal sections of vent piping shall be pitched a minimum of 1/4” per foot back toward the domestic water heater for proper condensate drainage.

Figure 2 - Existing Water Heater Sidewall Vent Termination

Install 2x2 Mesh Stainless Steel Screen in Existing Vent Termination

Domestic Water Heater Replacement Page 7

H. Reconnect Gas Piping: Furnish and install new 3/4” gas piping from the 1-1/4” gas main in mechanical room (including upsizing the tee in the 1-1/4” gas main if necessary) – the gas piping shall be routed as necessary to accommodate the connection point on the new water heater. Gas piping shall be Schedule 40 black steel with Class 150 malleable iron threaded fittings. Gas valves shall be bronze ball valves, full port, two-piece, with chrome plated ball. Gas piping shall be adequately supported from the structure above.

I. Check for Leaks: After all of the domestic water piping and gas piping work is complete, check the modified piping systems for leaks. Fix any leaks that are found by remaking the leaking joints as needed until no leakage is detected.

J. Adjust Domestic Water System Components:

1. Adjust Domestic Water Expansion Tank Pressure: Adjust the air precharge pressure in the existing domestic water expansion tank to 60 psig.

2. Adjust Domestic Hot Water System Settings: Adjust the water heater temperature to 120 degrees F.

K. Insulate New Piping: Furnish and install pipe insulation on all new domestic hot and cold water piping, and on piping where insulation has been removed to perform the water heater replacement described in this scope of work. Pipe insulation shall be fiberglass with all-service jacket.

Fiberglass insulation with molded PVC covers shall be provided at all fitting locations. Furnish and install rigid insulation inserts and insulation shields at all hanger locations. Fiberglass pipe insulation thickness shall be as follows:

1. 1-1/2” Pipe and Smaller: 1” thick.

L. Reconnect Water Heater Power: Reconnect power for the water heater to the existing 120V water heater circuit (FSP2-28).

M. Startup and Testing: Before starting the new domestic water heater for the first time, furnish start-up and testing services, performed by a qualified manufacturer’s representative. All start-up and testing procedures shall be in strict accordance with the domestic water heater manufacturer’s start-up and testing instructions, and shall be performed in the presence of the Contracting Officer’s Representative.

N. Demonstration and Training: Provide training on new domestic water heater functions and routine maintenance procedures. Training shall be given to BLM site personnel at a time that is acceptable to both the BLM site manager and the Contracting Officer’s Representative.

O. O&M Manuals: Furnish an operation and maintenance manual for the new domestic water heater.

VI. Submittals

A. Construction Submittals: Submittals shall be transmitted to the Contracting Officer for review and approval after contract award, but prior to commencing construction work.

1. Submit manufacturer’s product data for the following:

Domestic Water Heater Replacement Page 8

a. Domestic Water Heater (DWH-1).

B. Closeout Submittals: Submit operation and maintenance data to the Contracting Officer at project closeout.

1. Submit manufacturer’s operation and maintenance data for the following:

a. Domestic Water Heater (DWH-1).

VII. Attachments

A. None.

B. Additional information related to the original building construction (such as operation and maintenance manuals, shop drawings, and other construction documents) is available at the project site or is available upon request from the Contracting Officer’s Representative.

END