23 52 43.00 20.pdf

Renovations to Building 11 DDRV Solicitation No.: W91236-20-B-0017 DSCR Richmond, Virginia

SECTION TABLE OF CONTENTS

DIVISION 23 - HEATING, VENTILATING, AND AIR CONDITIONING (HVAC)

SECTION 23 52 43.00 20

LOW PRESSURE WATER HEATING BOILERS (UNDER 800,000 BTU/HR OUTPUT)

05/15

PART 1 GENERAL

1.1 REFERENCES

1.2 RELATED REQUIREMENTS

1.3 DESIGN REQUIREMENTS

1.3.1 Boiler Installation Requirements

1.3.1.1 Location

1.3.1.2 Combustion Air

1.3.1.3 Sequence of Operation

1.3.2 Detail Drawings

1.3.2.1 Drawings

1.3.2.2 Fuel Train / Wiring Diagram

1.3.3 Water Analysis

1.4 SAFETY STANDARDS

1.5 SUBMITTALS

PART 2 PRODUCTS

2.1 BOILERS

2.1.1 General Requirements

2.2 BURNERS AND CONTROL EQUIPMENT

2.2.1 Atmospheric-Type Gas Burner

2.3 BOILER TRIM AND CONTROL EQUIPMENT

2.3.1 Emergency Disconnect Switch

2.3.2 Microprocessor Controller

2.3.3 Relief Valves

2.3.4 Pressure Gage Gage

2.3.5 Thermometer

2.3.6 Drain Tapping

2.3.7 Make-up Water Station

2.3.7.1 Pressure Reducing Station

2.3.7.2 Backflow Preventers

2.3.8 Feedwater Treatment Feeder

2.3.9 Combustion Regulator

2.3.10 Air Vent Valve

2.3.11 High Temperature Limit Switch

2.3.12 Low Water Level Cutoff Switch

2.3.13 Boiler Safety Control Circuits

2.3.14 Indicating Lights

2.3.15 Alarm Bell

2.3.16 Post-Combustion Purge

2.3.17 Draft

2.3.18 Stack, Breeching, Combustion Air Intake Duct and Supports

2.3.19 Hot Water Coils

2.4 ELECTRIC MOTORS

SECTION 23 52 43.00 20 Page 1

FOR CONSTRUCTION

PART 3 EXECUTION

3.1 EQUIPMENT INSTALLATION

3.2 EQUIPMENT FOUNDATIONS

3.3 BOILER CLEANING

3.4 FIELD QUALITY CONTROL

3.4.1 Operational Tests

3.4.1.1 Preliminary Operational Test

3.4.1.2 Acceptance Operational Test and Inspection

-- End of Section Table of Contents --

SECTION 23 52 43.00 20 Page 2

Amendment 2

SECTION 23 52 43.00 20

LOW PRESSURE WATER HEATING BOILERS (UNDER 800,000 BTU/HR OUTPUT)

05/15

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI Z21.13/CSA 4.9 (2017; Errata 2018) Gas-Fired Low Pressure Steam and Hot Water Boilers

ASME INTERNATIONAL (ASME)

ASME BPVC SEC IV (2017) BPVC Section IV-Rules for Construction of Heating Boilers

ASME CSD-1 (2016) Control and Safety Devices for Automatically Fired Boilers

ASTM INTERNATIONAL (ASTM)

ASTM A53/A53M (2018) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

NATIONAL BOARD OF BOILER AND PRESSURE VESSEL INSPECTORS (NBBI)

NBBI NB-23 PART 1 (2013) National Board Inspection Code - Part 1 Installation

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA MG 1 (2016; SUPP 2016) Motors and Generators

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 211 (2019) Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances

NFPA 31 (2016) Standard for the Installation of Oil-Burning Equipment

NFPA 54 (2018) National Fuel Gas Code

NFPA 70 (2017; ERTA 1-2 2017; TIA 17-1; TIA 17-2;

TIA 17-3; TIA 17-4; TIA 17-5; TIA 17-6;

TIA 17-7; TIA 17-8; TIA 17-9; TIA 17-10;

TIA 17-11; TIA 17-12; TIA 17-13; TIA

17-14; TIA 17-15; TIA 17-16; TIA 17-17)

SECTION 23 52 43.00 20 Page 3

National Electrical Code

UNDERWRITERS LABORATORIES (UL)

UL 795 (2016) UL Standard for Safety Commercial-Industrial Gas Heating Equipment

1.2 RELATED REQUIREMENTS

Section 23 03 00.00 20 BASIC MECHANICAL MATERIALS AND METHODS, applies to this section, with the additions and modifications specified herein.

1.3 DESIGN REQUIREMENTS

Boiler must be suitable for installation in the space shown with ample room for opening doors and cleaning and removal and replacement of tubes.

Boiler must have an output of 340 MBH. Boiler must be designed and tested in accordance with ASME BPVC SEC IV , ASME CSD-1, NFPA 54 , NFPA 31 , NFPA 70 and ANSI Z21.13/CSA 4.9 . Boiler must be installed in accordance with NBBI NB-23 PART 1 . Paint boiler in accordance with manufacturer's recommendations. Boiler design working pressure must be 160 psig . Boiler operating pressure must be 12 psig . Boiler operating temperature must be 180 degrees F . Boiler return water temperature must be 160 degrees C .

1.3.1 Boiler Installation Requirements

1.3.1.1 Location

Install Boiler and associated hot water pumps in a mechanical room inside the facility in accordance with NBBI NB-23 PART 1 . Provide ample clearance around boilers to allow access for inspection, maintenance and repair. Passageways around all sides of boilers must have an unobstructed minimum width of 24 inches or the clearances recommended by the boiler manufacturer whichever is greater.

1.3.1.2 Combustion Air

Provide supply of air for combustion and ventilation. In accordance with NFPA 54 , NFPA 211 and manufacturer's installation manual, provide direct intake duct for amount of combustion air necessary to operate the boiler.

1.3.1.3 Sequence of Operation

Refer to drawing sheet M-701.

1.3.2 Detail Drawings

1.3.2.1 Drawings

Show boiler hot water isolation valves, emergency disconnect switch, and complete boiler gas train on the contract drawings.

1.3.2.2 Fuel Train / Wiring Diagram

Submit fuel train and wiring diagram .

1.3.3 Water Analysis

Provide test reports of water analysis. UFC 3-240-13FN Industrial Water

SECTION 23 52 43.00 20 Page 4

Treatment must be followed for all boiler installations.

1.4 SAFETY STANDARDS

Hot water boilers, burners and supplementary control devices, safety interlocks, or limit controls required under this specification, must meet requirements of the following standards as applicable:

a. Gas-Fired Units: ASME CSD-1, NFPA 54 , NFPA 70 , ANSI Z21.13/CSA 4.9 or

UL 795 .

b. All Units: ASME BPVC SEC IV , NFPA 70 and ASME CSD-1.

Controls not covered by the above must have a UL label, UL listing mark, or must be listed in the Factory Mutual Approval Guide.

1.5 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submittals with an "S" are for inclusion in the Sustainability eNotebook, in conformance with Section 01 33 29 SUSTAINABILITY REPORTING. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

Submittals for this Section must be delivered to the project Contracting Officer, who will forward two complete sets of copies to the appropriate approving official for review and approval.

SD-02 Shop Drawings

Fuel Train

Wiring Diagram

SD-03 Product Data

Boilers

Boiler Trim and Control Equipment

Burners and Control Equipment

Stack, Breeching, Combustion Air Intake Duct and Supports

SD-06 Test Reports

Operational Tests

Water Analysis

SD-07 Certificates

Boilers

Burners and Control Equipment

Boiler Trim and Control Equipment

SECTION 23 52 43.00 20 Page 5

Boiler manufacturer's certificate of boiler performance including evidence that the burners provided must be a make, model, and type certified and approved by the manufacturer of the boiler being provided.

SD-08 Manufacturer's Instructions

Boilers

Feedwater Treatment Feeder

SD-10 Operation and Maintenance Data

Boilers , Data Package 4

Submit in accordance with Section 01 78 23 OPERATION AND

MAINTENANCE DATA.

SD-11 Closeout Submittals

Posted Operating Instructions for Heating Water Boilers

PART 2 PRODUCTS

2.1 BOILERS

Provide hot water heating boiler complete with firing equipment, combustion chamber, insulation with steel jacket, safety and operating controls, integral electrical wiring and other appurtenances, to make the boiler a complete, self-contained, fully-automatic unit, ready for service upon completion of utility connections. Gas fired boilers greater than 300,000 Btuh input must have a thermal efficiency of at least 80 percent when fired at the maximum and minimum capacities which are provided and allowed by the controls.

2.1.1 General Requirements

Design, construction, installation, testing, and operation of boiler and appurtenances shall comply with NBBI NB-23 PART 1 , ASME BPVC SEC IV , ASME CSD-1, NFPA 54 , NFPA 31 , ANSI Z21.13/CSA 4.9 , and the manufacturer's instructions.

2.2 BURNERS AND CONTROL EQUIPMENT

2.2.1 Atmospheric-Type Gas Burner

Atmospheric-type gas burner (under 400,000 BTU/hr input). ASME CSD-1 and ANSI Z21.13/CSA 4.9 . Automatic recycling burner. Modulating type combustion control system with 4:1 turndown ratio. Intermittent proven pilot hot surface ignition system, and pilot must be electrode-ignited natural gas type. Design burner and combustion control equipment for firing natural gas having a specific gravity of 0.6 and a heating value of approximately 1000 BTU per cubic foot and be an integral part of the boiler. Burner controls and safety equipment must conform to applicable requirements of ASME CSD-1 and ANSI Z21.13/CSA 4.9 , including complete gas shut-off and pilot gas. Gas pressure available: 14 inches of water gage (WC) psig .

SECTION 23 52 43.00 20 Page 6

2.3 BOILER TRIM AND CONTROL EQUIPMENT

Provide in accordance with ASME CSD-1 and ASME BPVC SEC IV and additional requirements specified below.

2.3.1 Emergency Disconnect Switch

Provide and locate on wall outside boiler room entrance or just inside door, when boiler room door is on building exterior as required by ASME CSD-1 to allow rapid and complete shutdown of the boiler in the event of an emergency. Emergency switch must be a 15-amp. fuse-type safety switch. Switch must be red and furnished with a label indicating function of switch.

2.3.2 Microprocessor Controller

Provide microprocessor controller with LCD display and hard or soft key input. Microprocessor shall control primary and secondary hot water pump operation through relay contacts.

2.3.3 Relief Valves

Provide relieving capacity for the full output of boiler installed.

Safety relief-valve piping must conform to ASTM A53/A53M, schedule 40 steel pipe and be piped full-size to a floor drain with 6 inch air gap.

2.3.4 Pressure Gage Gage

Provide one located on supply water piping and one on return water piping.

2.3.5 Thermometer

Provide thermometer with a scale equivalent to 1.5 times outlet water temperature. Provide one located on supply water piping and one on return water piping.

2.3.6 Drain Tapping

Provide drain valves with hose connections on supply and return hot water riser piping.

2.3.7 Make-up Water Station

2.3.7.1 Pressure Reducing Station

Provide a water pressure-reducing valve and relief valve, or a combination of the two in the makeup water line to the boiler to maintain a water pressure of 12 psig in the hot water system.

2.3.7.2 Backflow Preventers

Use existing backflow preventer.

2.3.8 Feedwater Treatment Feeder

Provide floor mounted, Type II - Shot-Type Feeder (manual, intermittent feed), as indicated for use with pressures up to 165 psig maximum.

SECTION 23 52 43.00 20 Page 7

2.3.9 Combustion Regulator

Provide adjustable temperature, thermostatic immersion type that must limit boiler water temperature to a maximum of 250 degrees F . Control must actuate burner through an electric relay system to maintain boiler water temperature within normal prescribed limits at loads within rated capacity of boiler.

2.3.10 Air Vent Valve

Provide with screwed connection, stainless steel disk, and stainless steel seats to vent entrapped air.

2.3.11 High Temperature Limit Switch

Provide adjustable immersible aquastat type with a temperature setting above that of the combustion regulator and below that of the lowest relief valve setting. Aquastat must function to cause a safety shutdown by closing fuel valves in the event that boiler water temperature rises to the high temperature limit setting. A safety shutdown due to high temperature must require manual reset before operation can resume and prevent recycling of burner equipment. Pre-set high temperature limit devices that cannot be easily tested are not allowed.

2.3.12 Low Water Level Cutoff Switch

Low water level cutoff must cause a safety shutdown by closing fuel valves an alarm in the event that water level drops below the lowest safe permissible water level established by the boiler manufacturer and ASME BPVC SEC IV . A safety shutdown due to low water must require manual reset before operation can resume and prevent recycling of burner equipment.

2.3.13 Boiler Safety Control Circuits

Provide boiler safety control circuits, including control circuits for burner, must be single-phase, two-wire one-side grounded, and not over 120 volts. Provide safety control switching in ungrounded conductors.

Provide overcurrent protection. In addition to circuit grounds, ground metal parts which do not carry current to a grounding conductor.

2.3.14 Indicating Lights

Each safety interlock requiring a manual reset must have an individually labeled red indicating light. Non-recycling control interlocks must have the reset located on the control itself. Red indicating lights on the control panel may be omitted if the burner combustion control system has a Keyboard Display Module installed that will identify the lockout information required in Item c. below. Indicating lights must have colors as follows:

a. Amber: Ignition on

b. Green: Main fuel safety shut-off valves open

c. Red (One for Each): Safety lockout, flame failure, low water level, and high temperature

SECTION 23 52 43.00 20 Page 8

2.3.15 Alarm Bell

Provide alarm bell, electrically operated, with a manual disconnect switch. Disconnect switch must be type and wired so that switching off alarm following a safety shutdown will not prevent alarm from sounding again upon recurrence of a subsequent safety shutdown condition.

2.3.16 Post-Combustion Purge

Provide controls and wiring necessary to ensure operation of draft fan for a period of not less than 15 seconds or of sufficient duration to provide four complete air changes in the boiler combustion chamber (whichever is greater) following shutdown of burner upon satisfaction of heat demand and in accordance with ASME CSD-1. Upon completion of post-combustion purge period, draft fan must automatically shutdown until next restart.

2.3.17 Draft

Comply with boiler manufacturer's recommendations.

2.3.18 Stack, Breeching, Combustion Air Intake Duct and Supports

NFPA 211 , Type B - gas, prefabricated multi-wall type, flashed to the roof, and complete with rain cap. Stack diameter and height must be in accordance with manufacturer's recommendations and conform to NFPA 211 .

Reuse existing roof penetration and seal opening tightly.

2.3.19 Hot Water Coils

Provide coils capable of heating 34 GPM of water with 20 degree F rise conforming to ASME BPVC SEC IV .

2.4 ELECTRIC MOTORS

Electric motors must meet requirements of NEMA MG 1. Motors less than 1 hp must meet NEMA High Efficiency requirements. Motors 1 hp and larger must meet NEMA Premium Efficiency requirements. Motors which are an integral part of the packaged boiler system must be the highest efficiency available by the manufacturer of the packaged boiler. Motor must be multi-speed or variable speed.

PART 3 EXECUTION

3.1 EQUIPMENT INSTALLATION

Install equipment in accordance with manufacturer's installation instructions and NBBI NB-23 PART 1 . Grout equipment mounted on concrete foundations before installing piping. Install piping in such a manner as not to place a strain on equipment. Do not bolt flanged joints tight unless they match. Grade, anchor, guide, and support piping without low pockets. Feedwater treatment feeders must be mounted so that the top of the feeder is no higher than 48 inches above the finished floor.

3.2 EQUIPMENT FOUNDATIONS

Locate equipment foundations as indicated, designed, and made of sufficient size and weight to preclude shifting of equipment under operating conditions or under abnormal conditions that could be imposed upon the equipment. Foundations must meet requirements of the equipment

SECTION 23 52 43.00 20 Page 9 manufacturer. Concrete and grout must conform to Section 03 30 00

CAST-IN-PLACE CONCRETE.

3.3 BOILER CLEANING

Prior to fill and start-up, flush the entire heating system. Clean the entire heating system with an approved cleaner in accordance with the manufacturer's recommendation. Clean all strainers. Flush cleaning solution out of the system and refill. Professional services are required for flushing/cleaning process and chemical treatment of fill water.

3.4 FIELD QUALITY CONTROL

Perform and furnish everything required for inspections and tests as specified herein to demonstrate that boiler and auxiliary equipment, as installed, are in compliance with contract requirements. Start-up and operate the system. During this time, clean strainers until no further accumulation of foreign material occurs. Exercise care to minimize loss of water when strainers are cleaned. Adjust safety and automatic control instruments as necessary to place them in proper operation and sequence.

Test instrumentation must be calibrated and have full scale readings from

1.5 to 2 times test values.

Amendment 2

3.4.1 Operational Tests

Furnish the services of an engineer or technician approved by the boiler manufacturer of installation, startup, operational and safety testing.

This person must remain on the job until each boiler has been successfully operated. Furnish and perform everything required for inspections and tests of the boiler and auxiliary equipment. Test instrumentation must be calibrated and have full-scale reading from 1.5 to 2 times test values.

Demonstrate proper operability of combustion control, flame safeguard control and safety interlocks. Provide a detailed description of all boiler startup and operational tests in the Commissioning Plan .

Amendment 2

3.4.1.1 Preliminary Operational Test

Operate the boilers continuously for a period of at least 8 hours to demonstrate proper operability of the combustion control, flame safeguard control, and safety interlocks.

3.4.1.2 Acceptance Operational Test and Inspection

Prior to requesting an acceptance test, conduct a satisfactory operational test for at least 8 hours, and provide a certified statement that the equipment is installed per all requirements of this guide. Contracting Officer, upon receipt of the notice from the Contractor, will request a boiler inspection by an approved boiler inspector. Fifteen days advance notice is required for scheduling inspector to conduct acceptance operational test and inspection.

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SECTION 23 52 43.00 20 Page 10