H11.REV

STEAM BOILER PLANT (Larger than 450,000 BTU/H)

NOTE: FINAL COPY: AUGUST, 1988

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work in this Section includes the providing of labor, materials, equipment, and services necessary for a complete and safe installation, in accordance wit the contract documents and all applicable codes and authorities having jurisdiction for the following

NOTE: INDICATE ALL WORK TO BE COVERED BY THIS SECTION. EDIT PORTIONS OF WORK INDICATED TO SUIT PROJECT REQUIREMENTS

NOTE: SEE SECTION FOR PREFABRATED BREECHING AND CHIMNEY'S. EDIT THIS SECTION AS REQUIRED

1.	Mechanical draft boiler-burner units.

2.	Breeching & Chimney.

3.	Fuel oil system.

4.	Boiler feed-water system.

5.	Boiler blow-down system.

6.	Control system.

7.	Accessories.

2)	RELATED WORK AND REQUIREMENTS

A.	Requirements of GENERAL CONDITIONS, DIVISION NO.1 and Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK apply to all work in this Section

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK IN THIS SECTION

B.	Related work in the following Sections:

1.	PIPING

2.	STEAM SYSTEM.

3.	INSULATION

4.	AUTOMATIC CONTROL SYSTEMS.

5.	FUEL OIL TANKS AND SPECIALITIES.

6.	PREFABRICATED BREECHING AND CHIMNEY.

7.	MOTORS AND MOTOR CONTROLLERS.

8.	-----.

3)	REFERENCE STANDARDS

A.	Published Specifications' standards, tests or recommended methods of trade, industry or governmental organizations apply to work in this Section

B.	Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for additional Reference Standards

4)	QUALITY ASSURANCE

YS

A.	System shall be arranged for simultaneous operation of boilers.

B.	System shall be arranged to prevent simultaneous operation of boilers.

C.	System shall be arranged for lead/lag sequential operation of boilers.

YS

D.	Fuel burning system shall be designed to operate satisfactorily and efficiently without objectionable smoke or odor

E.	Boiler-burner units shall be installed in accordance with requirements and recommendations of manufacturer and

1.	American Boiler Manufacturers Association (ABMA).

2.	American Gas Association (AGA).

3.	American Society of Mechanical Engineers (ASME).

4.	American Society of Testing and Materials (ASTM).

5.	American Welding Society (AWS).

6.	Factory Mutual (FM).

NOTE: FOR CAST IRON BOILERS

7.	Institure of Boiler and Radiator Manufacturers (I-B-R).

8.	Industrial Risk Insurers (IRI).

9.	Local air pollution control criteria.

10.	Local building ordinances.

11.	National Electrical Manufacturer's Association (NEMA).

12.	National Fire Protection Association (NFPA).

13.	Rules of utility company.

14.	Underwriters Laboratories (U.L.)

F.	Manufacture shall have a Material Equipment Approval (MEA) number or Bureau of Standards and Appeals (BS&A) number for the City of New York

G.	The installation shall be in compliance with Industrial Code Rule 4, state of New York Department of Labor

5)	SERVICE

A.	Provide free 24-hour service for one year from date of boiler plant acceptance, to include one complete heating season. Service personnel shal be factory trained. Service organization shall have a minimum of five year experience in servicing boiler plants of similar size and type, as approved

B.	Refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for Guarantee and other Quality Assurance requirements

NOTE: FOR NEW YORK CITY

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE REFERENCES ONLY DIRECTLY AFFECTING WORK IN THIS SECTION

6)	SUBMITTALS

A.	Submit shop drawings and product data for the following:

1.	Boiler-burner units: Certified drawings of unit equipment, ASME certification, bill of materials, safety devices, controls and wiring diagrams, equipment catalogs and certified factory test results

2.	Breeching, stack and support details and calculations.

3.	Fuel oil system: Fuel train, pumps, performance curves, piping and wiring diagrams, equipment catalogs and certified factory test results of fuel oil train

4.	Boiler feed-water system: Certified drawings, wiring diagrams and pump performance curves

5.	Boiler blow-down system: Certified drawings and manufacturer's test certificate

6.	Control system: Control panels and wiring diagrams.

7.	Accessories: smoke indicating and recording system including wiring diagrams and gas compressors

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

NOTE: FOR PACKAGE STEEL BOILERS.

A.	Packaged boilers: Cleaver Brooks, Johnston and York-Shipley.

B.	Cast Iron Boilers: H.B. Smith Co. and Weil-McLain Co. Inc.

NOTE: FOR CAST IRON BOILERS.

NOTE: EDIT BURNERS FOR GAS, FUEL OIL OR COMBINATION FIRING. REVIEW WITH BOILER MANUFACTURER

C.	Burners: Superior Combustion Industries, Ray Burner Co., Burner Division, Preferred Utilities, S.T. Johnson and Peabody Gordon - Piatt and Webster Combustion

NOTE: OIL PUMPS SUPPLIED AS PART OF PACKAGE BOILER

D.	Oil pumps/oil pump sets: Kraissl, Preferred Utilities and Viking Pump Co

E.	Boiler feed water systems - boiler feed pumps set: Cleaver Brooks, BFS Industries (Code BJG), Industrial Steam, Permutit and Stickle

2)	BOILER-BURNER UNITS

A.	Boiler-burner units shall be factory assembled, with boiler trim piped, wired and tested units constructed and certified in accordance with the ASM Code and of the design pressure and capacities as scheduled on the drawings The Boiler manufacturer shall be responsible for all unit components. Controls and circuits shall be grounded and shall operate on 120 volt, 60 hertz. Provide transformers. Units shall be tested and fired at factory Before shipment, submit certified copies of test results

B.	Unit Equipment shall be furnished with, but not limited to, the following:

NOTE: FOR PACKAGE STEEL BOILERS.

NOTE: CHECK DESCRIPTION OF SELECTED BOILER BEFORE EDITING

1.	Boiler shall be 3 or 4 pass, steam boiler with full wetback or dryback steel, Scotch Marine type on structural frame

a.	Furnace tubes without spinners or turbulators and refractory lined combustion chamber with removable refractory lined rear cleanout door, manhole and handholes and observation ports

b.	2 inch thick fibrous glass insulation and 2 coats of heat resisting enamel on steel casing

c.	Multiblade, No. 10 USSG steel, damper with ball bearings shall be located in breeching connection. Damper will be automatically operated by draft controls. See sequence draft control this section

d.	Lifting lugs, water level gauge, gauge glass with red line markings and trycocks

e.	For drain valves, provide bronze hose cocks.

NOTE: OBTAIN SIZE FROM CATALOG FOR BOILER SELECTED

f.	--- inch surface and --- inch bottom blowoff tappings.

g.	Explosion door with deflector in rear combustion chamber.

h.	Check and globe valves in feed line.

i.	Maximum draft loss for 3 pass shall be 2.0 inch wg. and for 4 pass shall be 6.0 inch wg

j.	Overall efficiency shall be 80 percent when operating between 80 percent and 100 percent

k.	Provide 8 inch diameter pressure gauge with brass tee-handle cock, brass syphon and 1 percent accuracy

l.	Provide steel brush and tube scraper with pipe handle.

NOTE: FOR CAST IRON BOILERS.

2.	Boiler shall be a low pressure, tubular sectional cast iron with pressurized fire box for forced draft venting and a refractory insulate burner mounting plate. Boiler shall be mounted on structural frame. Boiler shall be capable of developing full I-B-R gross output capacit at 100 percent firing rate and have an overall efficiency of 75 percent when operating between 75 percent and 100 percent of rating. Boiler shall be furnished with, but not limited, to the following.

a.	Steel flue scraper and brush, supply and return manifolds and bronze drain valves

b.	Multiblade No. 10 USSG, steel damper with ball bearings shall be in breeching connection. Damper shall be automatically operated by draft controls see sequence draft in this section

c.	Water level gauge with gauge glass with red markings and trycocks.

d.	Check and globe valves in feed line. Blowoff tappings shall be surface and bottom

5

(A)	inch diameter pressure gauge with brass tee-handle cock, brass syphon and 1 percent accuracy

e.	Boiler shall be provided with fiber glass insulated heavy gauge steel jacket with baked enamel finish. Jacket shall be designed to permit installation after the connection of supply and return piping

NOTE: IN NYC FURNACE VOLUME SHALL MEET DAR REQUIREMENTS

f.	Furnace volume shall meet Department of Air Resources (DAR) Requirements.

3.	Burner:

a.	GENERAL

URNER

(1)	Burner shall be combination gas-oil burner, for independent burning of each fuel with oil burning arranged as standby

(2)	Burner shall be gas burning only.

(3)	Burner shall be oil burning only.

URNER

(4)	Burner shall be capable of firing the boiler to the specified maximum continuous rating on all fuels specified without flame impingement or damage to any boiler part

(5)	Burner shall be arranged for full modulation with pre-purge, proven low fire start, high fire run and post-purge

(6)	Burner shall be furnished with a prewired unit control panel which incorporated an electronic combustion safeguard burner controls, ultraviolet sensitive electronic flame detector and burner management controls

NOTE: EDIT AS REQUIRED.

(7)	Unit Control Panel shall be equipped with a manual fuel changeover without burner adjustment modifications

(8)	Burner and all components shall be IRI (FM) approved.

b.	Gas Burner

(1)	Gas burner shall be a gas ring type with flame retention band. Burner shall be capable of a minimm 4 to 1 turndown while maintaining stable and efficient flame. Burner unit shall include

(a)	Gas flow control valve shall maintain constant pressure throughout the modulating range to maintain a constant fuel-air ratio

(b)	Gas pressure regulating valve shall reduce and maintain the pressure required for the main burner.

(c)	Pilot manual shutoff plug type gas valve, pilot gas pressure regulator, dual pilot automatic solenoid shutoff valves and low pilot gas pressure cutoff and alarm

(d)	Two main manual shutoff gas valves, lubricated plug type, main gas pressure regulator, motorized primary automatic safety gas shutoff valve and auxillary motorized, automatic safety gas shutoff valve and variable input flow control valve

(e)	Solenoid between 2 automatic gas valves vented to outside of building. Open to vent when automatic valves are closed. Separate vents for pilot automatic shutoff valves and main burner automatic safety valves

(f)	Solenoid valve, manual reset cutoffs and alarms for burner high and low gas pressure

(g)	Air distributing plenum, volume control damper and refractory burner throat

(h)	Ignition system shall be automatic, gas-electric type with magnetic shutoff valves and gas pressure gauges

(i)	Gas pressure gauges: For input control, provide positioning motor linked to multiport cylindrical air volume control and to gas volume control valve. Air-fuel ratio over operating range shall be minimum 4 to 1, with air flow switch to sense operation of draft fan

NOTE: EDIT IF STEAM IS USED FOR ATOMIZING. STEAM ATOMIZING CAN ONLY BE USED ON HIGH PRESSURE BOILERS

c.	Oil Burner

FUEL

(1)	Burner shall be suitable for No. 2 or No. 4 fuel oil.

(2)	Burner shall be suitable for No. 5 or No. 6 fuel oil.

FUEL

(3)	Oil burner shall be low pressure air atomizing type oil burner with rotary atomizing air compressor with NEMA frame motor. Burner shall be capable of a minimum 4 to 1 turndown while maintaining stable and efficient flame. Boiler unit shall include:

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

(a)	Dual fuel oil solenoid shutoff valves, piped in series and wired in parallel

(b)	Oil suction piping manifold with: cam operated fuel oil flow control valve simplex fuel oil thermometer; check valve; gate valve

(c)	Drip pan under assembly of 16 gauge galvanized steel, weld and sized to catch oil drippings

(d)	Input controller with positioning motor linked to multiport cylindrical air volume control and to oil burner cam control valve. Air flow switch to sense operation of draft fan

NOTE: FOR PACKAGE BOILERS ONLY

(e)	Air distribution plenum and volume control damper and refractory burner throat

GNIT

(f)	Ignition shall be automatic, gas-electric type with magnetic shutoff valves and gas pressure gauges

(g)	No. 2 fuel oil ignition assembly shall consist of: oil pump set skid mounted; light oil firing head assembly; 12,000 volt ignition transformer assembly. All integrated into burner programming assembly to perform as part o standard intermittent ignition cycle

GNIT

NOTE: FOR NO. 5 OR NO. 6 FUEL OIL.

UEL OIL

(h)	Provide fuel oil preheaters, boiler mounted low density electric and steam safety type, double shell, steam to water to oil, heater eac with thermostatic controls. Controls shall be set to prevent oil delivery to burner until oil in heater reaches manufacturer's recommended burning temperature and to cut out the electric heater when steam i available

(i)	Fuel oil preheater shall be boiler mounted low density electric and hot water, safety type, double shell, water to water to oil forced circulation heater, each with therostatic controls. An in-line hot water pump shall circulate boiler water through this primary preheater. Controls shall be set to prevent oil delivery to burner until oil in heater reaches manuacturer's recommended burning temperature and to cut out the electric heater when hot water is available

UEL OIL

NOTE: FOR BOILERS; INDICATE VAlUE OF EXTERNAL STATIC PRESSURE IN SCHEDULE, FOR CORRECT F.D. FAN & MOTOR SELECTION BY BOILER MANUFACTURER

4.	Forced draft fan shall be centrifugal type, with acoustically lined air inlet and scroll volume damper, rotary sleeve discharge damper, air pressure switch, motor, and motor controller

NOTE: COORDINATE FAN WITH ELECTRICAL DEPARTMENT.

NOTE: MAXIMUM dBA VALVE WILL VARY WITH BOILER SIZE.

a.	Sound pressure level at boiler rated capacity shall not exceed ----- dBA value per ABMA sound pressure test code for package boilers

NOTE: FOR CAST IRON BOILERS IF REQUIRED.

5.	Induced draft fan shall be similar to L.J. Wing Mfg. Co., at smoke outlet with

a.	Side inlet and top discharge.

b.	Heavy duty barometric damper on unit.

c.	Totally enclosed, ball bearing, multispeed motor.

d.	Belt drive.

NOTE: COORDINATE FAN WITH ELECTRICAL DEPARTMENT.

e.	Motor controller.

f.	Prepurge and low draft cutoff switch.

g.	Vibration eliminator mountings.

C.	Water level controls:

PERATION

1.	Operation: When boiler calls for water, controller makes contact and opens motorized valve in feed line

a.	As valve opens, end switch closes and starts one boiler feed pump.

b.	If water level continues to drop, lower contact on controller automatically starts second boiler feed pump

c.	Rising of boiler water to normal level causes controller to close motorized valve and stop boiler feed pumps

d.	When boiler is inoperative, respective controller de-energizes to prevent operation of motorized valve and feed pump

e.	Controller shall be similar to McDonnell Miller No. 93. Provide motorized valve, with selector switch and end switch, similar to Barber-Colman Type VC-2007 with MC-237 operator

2.	OPERATION: When boiler calls for water, controller makes contact and starts boiler feed pump

a.	Rising of boiler water to normal level causes controller to stop boiler feed pump

b.	Controller shall be similar to McDonnell Miller No. 93.

PERATION

NOTE: SELECT VALVE

D.	Safety valve shall be iron bodied, side outlet, nonadjustable type, ASME rated and approved, factory set and sealed with exposed stainless steel or cadmium plated carbon steel springs, stainless steel seat and disc and bottom guided disc. Test handle shall be rotational through 360 degrees and not simmer at pressures below set pressure. Size and number shall be in accordance with ASME Code for Low or High Pressure Boilers, except maximum size 3 inch. Provid pull ring assembly for manually testing with galvanized wire cable, pulleys an lightweight pull handle

E.	Safety controls:

1.	On oil firing, shut down boiler fuel oil pump, shut down burner, close automatic fuel oil valves and sound alarm in the event of

a.	Low fuel oil pressure.

b.	Loss of combustion air.

c.	Flame failure.

d.	Loss of electric power to controls.

e.	Low water level.

f.	Loss of atomizing air.

g.	High steam pressure.

2.	On gas firing, shutdown burner, close automatic gas valves and sound alarm in the event of

a.	High or low fuel gas supply pressure.

b.	Loss of combustion air.

c.	Flame failure.

d.	Loss of electric power to controls.

e.	Low water level.

f.	High steam pressure.

3.	Safety shutdown shall require manual reset.

4.	Aquastat, similar to Honeywell Model L 4006 B, shall prevent burner from modulating to high fire until water temperature reaches setting

5.	Safety latch switch shall close atomatic fuel valves whenever burner is swung open to prevent burner firing until burner is returned into full operatin position

3)	BREECHING AND CHIMNEY

NOTE: REVIEW LOCATION AND SUPPORT OF BREECHING AND CHIMNEY WITH STRUCTURAL ENGINEER. FOR PREFABRICATED SYSTEMS SEE SECTION ON PREFABRICATED BREECHING AND CHIMNEY.

A.	Breeching and chimney shall be in accordance with NFPA No. 211 for metal connectors for low heat appliances, for use with building equipment burning gaseous and liquid fuels

B.	Cleanout doors to clean the entire breeching without dismantling, shall be as indicated on drawings. Gauge steel shall not be less than that of the breeching. Size shall be 20 inch x 14 inch, except breeching less than 16 inch one dimension 20 inch and the other dimension 2 inch less than breeching width. Larger sizes where required. Cleanout door asembly shall be gas tight with 1/16 inch thick non-asbestos gasket and planed faces, 10 feet apart on centers

C.	Connections shall be provided for gas sampling, smoke density indicators, draft dampers and connections for temperature and draf sensors

D.	Drain caps at the bases of vertical sections shall be provided and shall be piped to suitable drains

E.	Supports, hangers and anchors shall be designed to carry not less than five times the breeching weight

F.	Chimney shall be terminated as indicated on drawings and in accordance with local codes and supported by a substantial steel framework

G.	Breeching of black iron or steel shall be welded airtight, not less than gauges listed = = DIAMETER GAUGES = 10 inches 24 = 10.1 - 14 inches 22 = 14.1 - 16 inches 20 = 16 inches 16 =

1.	Rectangular breeching: shall have corners and girth angles: 1 1/2 inch x 1 1/2 inch x 1/2 inch. Provide 1 inch x 1 inch x 1/8 inch angles on 12 inch centers between girth angles to support covering

H.	Expansion joints shall be bellows type approximately 6 inches wide at locations shown on the drawings and as required

1.	Joint system shall consist of 3/16 inch steel plate welded to the inside of breeching with downstream section of breeching free to move outside the plate

2.	Steel reinforcing angles shall be welded around both top and bottom sections of breeching and between the angles

3.	An expansion angle type bellows of 12 gauge steel shall be fitted and welded to the angles

I.	Chimney shall be welded steel construction not less than gauges listed and have a galvanized steel rain shield and cap flashing = = DIAMETER GAUGES = 14 inches 16 = 14.1 - 16 inches 14 = 16.1 - 18 inches 12 = 18 inches 10 =

HIMNEY

4)	BOILER FEED WATER SYSTEM

BFS

A.	Combination condensate tank and boiler feed pumps, with steel condensate tank welded, hot dipped, galvanized with level gauge and glass, thermometer, float operated cold water make-up valve and factory mounted and wired control cabinet with

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

1.	Motor controllers, manual switch for alternating lead pump, motorized valve selector switch, terminal strip and control transformer, for 120 volt control circuits

2.	Horizontal pumps, bronze fitted (single)or (two) stage peripheral turbine type pump with mechanical seals. Pump shall be vertical split case design with bearing housing and channer rings, which shall be replacable without replacing the bearing housing. Impellers shall be mounted on stainless shaft between grease lubricated ball bearings. Pump shall be self venting. Pump relief valve shall be factory piped to connection on receiver. Pump shall be flexible coupled and mounted on a structural stand with condensate tank inlet strainers, check valves, non overloading motors and gauges on suction and discharge of pump. For pump operation refer to level controls

B.	Deaerator heater/boiler feed pump system shall include a welded steel condensate tank hot dipped galvanized after fabrication with level gauge and sight glass, thermometer and float operated cold water make-up valve. For design and operating conditions, refer to schedules on drawings

1.	Condensate transfer pumps shall be horizontal, bronze fitted (single stage) or (two stage) centrifugal end suction pump with mechanical seals. Impeller shall be mounted on stainless seel shaft between grease lubricated ball bearings. Bypass orifice shall be piped to connection on reciiver. Pump shall be flexible coupled and mounted on a structural stand with condensate tank, inlet strainers, check valves, non-overloading motors and gauges on suction and discharge of each pump.

2.	Deaerator heater shall be steel welded tank in accordance with ASME Code designed with a manhole, tank shall be code stamped for 50 psig minimum For design and operating conditions, see schedules on drawings. Deaerator shall be mounted on structural steel stand with boiler feed pumps, interconnecting piping and wiring. Deaerator equipped with connections for

a.	Steam pressure reducing valve provided to reduce steam pressure to deaerator operating pressure

b.	Overflow drainer sized to relieve full capacity at operating pressure.

c.	Required number of relief valves sized to relieve full capacity of pressure reducing valve in the event of failure and set to relieve system at ----- psig

d.	High level alarm switch and low level alarm switch. Wire alarms to main boiler control panel annunciator

e.	Manual and automatic vent valves.

f.	Pressure gauge, thermometer and water level gauge glass set.

NOTE: CHECK PUMP SELECTION, IF CENTRIFUAL TYPE CAN NOT BE USED EDIT BOILER FEED PUMPS

3.	Boiler feed pumps (refer to Condensate pumps).

4.	Control panel for boiler feed system with deaerator heater shall be complete factory wired and tested. The panel shall contain the necessary motor starters, indicating lights, terminal block, switches as required and control circuit transformer if required. Fuse protection shall be provided for each motor starter. The motor starters shall be magnetic across the line type with overload protection and 120 volt holding coils. All wiring to the boiler feed pumps shall be complete. All wiring shall be in accordance with the Electrical Code

BFS

C.	System shall be similar to Cleaver-Brooks.

5)	BOILER SURFACE BLOWDOWN SYSTEM

BLDN

A.	Shall be manual system, using a variable calculated orifice similar to Madden

B.	Shall be continuous, automatic system to maintain boiler water dissolved solids concentrate below 3500 ppm

BLDN

C.	Steel blowdown tank shall be a ASME coded vessel designed for 50 psig with steam vent, level gauge and sight glass, high level overflow and inlet cooling water valve. Provide boiler water conductivity controller meter and boiler blowdown valves

NOTE: CONSULT WITH PROJECT MANAGER FOR MINIMUM PRESSURE REQUIRED IN THE BLOWDOWN TANK

BDN

1.	Blowdown water cooling system shall consist of a heat exchanger using city water as the cooling medium

NOTE: BLOWDOWN TANK TO BE ATMOSPHERIC.

2.	Blowdown water cooling system shall be using a sump-pump arrangement with city water introduced to mix and cool the blowdown water

NOTE: FOR BLOWDOWN WATER COOLING BY HEAT EXCHANGER.

BDN

D.	Blowdown water cooling system shall be a blowdown tank level controller and a blowdown tank discharge control valve to maintain the tank level and to mete the blowdown water discharge

1.	Utilize the blowdown tank flash steam by directing the same to the deaerator steam supply line downstream of the PRV; provide a check valve in the flash steam line to prevent back flow to the blowdown tank

2.	Utilize the heated city water from the blowdown heat exchanger as the make-up water directed to the deaerator

3.	System shall have a valved by-pass around the heat exchanger to supply city water directly to the deaerator

4.	System shall have a valved by-pass around the heat exchanger to discharge blowdown water directly to the sewer

NOTE: FOR BLOWDOWN WATER COOLING BY SUMP-PUMP SYSTEM.

E.	Blowdown water cooling system: shall be a concrete sump with vertical pumps with motor and motor controllers. The sump shall contain a electronic sump level controller and electronic sump temperature transmitter. Two electri switches shall open the city water sump inlet solenoid valve when energized simultaneously with wire switches in series

NOTE: FOR HEAT EXCHANGER SYSTEM.

BOILER

F.	Conductivity control: Conductivity controllers shall modulate blowdown rate to the tank individually for each boiler. High water level in blowdown tank shall close the tank inlet solenoid valve. Level controller shall modulat the blowdown water control valve to meter blowdown water to the heat exchanger

NOTE: FOR SUMP-PUMP SYSTEM.

G.	Boiler water conductivity control: Conductivity controllers shall modulate blowdown rate to blowdown tank. High water level in blowdown tank shall close the tank inlet solenoid valve. Sump pump shall start at high water level in th sump. Sump pump shall stop at low water level in the sump. Blowdown tank inlet solenoid valve shall close at high high water level in the sump

1.	One city water sump inlet solenoid switch (LS) shall energize when the water level in the sump rises to an intermediate level. The second city water sump inlet solenoid valve switch (TS) shall energize only when the water temperature in the sump rises to 140 deg F. The solenoid valve will not open until the switch LS energizes simultaneously with the switch T

BOILER

NOTE: FOR COMBINATION BURNER, IF AUTOMATIC CHANGE OVER FROM GAS TO OIL IS REQUIRED REVISE CONTROL SYSTEM

6)	CONTROL SYSTEM

A.	Provide complete control system for fully automatic operation of boilers.

B.	Fully automatic controls and control cabinet: (boiler control panel) shall be as follows

1.	To provide low fire starting.

2.	For modulating flame control for boiler operation under varying loads.

3.	To control combustion air and fuel ratio, and atomizing air with modulating motors, controls, relays and wiring

4.	Adjustable modulating pressure controller: with manual adjustments to provide for lead/lag or parallel operation of boilers. Controls shall operate from steam pressure arranged to maintain constant predetermined pressure at mai header, similar to Honeywell proportional band type with remote indicator on Boiler plant panel

NOTE: CHECK FIREYE MICROPROCESSOR BASED FLAME MONITOR (E100) BEFORE SPECIFYING THE FOLLOWING

5.	Burner flame failure controller:

a.	To control ignition, starting and stopping of the burner and provide both a pre-combustion purge and post-combustion purge

b.	To shut down the burner in the event of ignition, pilot or main flame failure

c.	Contacts for external fresh air damper operators.

d.	Remote emergency boiler shutdown switches.

C.	Enclosed steel unit cabinet shall be mounted on boiler-burner unit, includiI.T

1.	Gauges, signal lights, circuit breakers, selector switches, toggles, etc:

a.	Flush mounted in face of cabinet(s).

b.	Identified by individual nameplates.

c.	To indicate safety controls as specified under Safety Controls in this section

2.	Motor controllers, circuit breakers, fuses, relays, flame safeguard programmers, transformers and contactors, shall be mounted in cabinet

3.	Provide the following:

a.	Circuit breakers for atomizing air compressor and draft fan.

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

b.	Motor controllers: interlocked with burner and forced draft fan.

c.	Burner ON-OFF switch wired in limit circuit.

d.	Central circuit fuses.

e.	White: CALL FOR HEAT signal light.

f.	Green: PILOT signal light.

g.	Blue: MAIN FUEL VALVE signal light.

h.	Amber: LOW DRAFT signal light.

i.	Red signal lights: FLAME FAILURE, HIGH STEAM PRESSURE, LOW OIL PRESSURE, LOW WATER, HIGH GAS PRESSURE, LOW GAS PRESSURE

j.	Alarm bell and transformer. Alarm to sound in event of: Flame Failure; Low Water level; High Steam Pressure; Low Oil Pressure; Low Gas Pressure; High Gas Pressure

k.	Manual alarm silencer.

l.	Contacts for alarms.

m.	Modulating motor transformer.

NOTE: EDIT IF BOILER IS NOT DUAL FUEL OR IF OPERATION IS MANUAL. FOR AUTOMATIC TRANSFER TO NATURAL GAS CHECK WITH LOCAL UTILITY

n.	Manual-automatic (outside temperature, line gas pressure or boiler automation system) controlled fuel transfer switch

o.	UL approved electronic flame safeguard and combustion programming system: Cleaver-Brooks CB-70 or Honeywell R-4127 Protecto-relay with C-7015A scanner

p.	Lead/lag sequencing switch with rotary selector pilot lights and sequence order indicator. Coordinate with Section AUTOMATIC CONTROLS of this Specification

q.	Numbered terminal strips.

NOTE: CONTROL PANEL WITH DEVICES MUST BE SHOWN ON DRAWING

D.	Boiler plant control panel:

1.	Instruments and controls: Smoke indicators and smoke density recorders shall be as specified in Sub-Section "SMOKE INDICATING AND RECORDING SYSTEM" of this Specification

a.	Draft gauge shall be 3-way petcocks, front zero adjustment and 0.01 inch scale divisions. To indicate pressure in last pass of furnace, similar to Peferred Instruments Model JC21F

b.	Sequence draft control drive unit with built-in low draft cutoff with antipuff time delay. Start draft selector shall permit burner lightoff at 20 percent or more of fixed damper opening and field adjustable. Sensitivity to maintain furnace draft within 0.01 inch wg of set point with adjustable proportional band mechanism to permit filtering out of furnace pulsation withou loss of sensitivity. To open damper to START position before burner can operate. Prove draft by physical sensing and electrical interlock. Maintain fixed operating draft during running periods. Open damper during burner spindown. Close damper upon completion of burner post-purge cycle. Turns in draft sensing pipe lines made with brass plugged tees or crosses. Similar to Preferred Instruments Model JC-20F

c.	Panel shall have common dry contact for remote monitoring of alarms, including 10 spare circuits

d.	Provide flue gas temperature gauges, indicating/ monitoring/alarm unit for boiler exit gas temperature. Display range of this digital reading, solid stat electronic, thermocouple operated instruments shall be 0-999 deg F. The instrument shall contain internally adjusted set points for inefficient and dangerous temperature levels, pushbutton set point recall, SPDT relays, alarm light with 180 deg visibility, and manual reset. The FGT unit shall be Preferred Instruments series JC-15

e.	Remote reading fuel oil storage tank gauging system shall be as specified in Fuel Oil Tank and Specialties

f.	Alarm bell assembly and manual alarm silencing switch: Alarm to sound for:

(1)	Excessive smoke density.

(2)	Excessive flue gas temperature.

(3)	Fuel tank low level.

g.	The instrument panel shall be code gauge steel all welded construction. Boiler indicating instruments, recorders and controllers, shall be flush mounte on top panel sector. Panel arrangement and location of each instrument and connecting piping and wiring shall be symmetrical for similar functions. Split front panel access doors shall have full length piano hinges and positive latch handles fitted to panel. All components within the panel shall be mounted on a special perforated metal subplate, with color coded wiring concealed in plastic troughs, and with numbered terminal strips (numbering to be coordinated with boiler manufacturer) for identification of external connections. Sensing lines from panel mounted devices shall be piped to a terminal point on the panel. (Interconnecting external piping from remote components shall be brought to the terminal point b the contractor). Panel shall be prime coated, and finished with machine enamel, white inside, gray outside. Provide laminated nameplates for all panel mounted instruments and complete wiring diagrams showing panel terminal connections and interconnections with packaged boilers. Panel shall be mounted on 6-1/2 inch high reinforced bracket legs shall be bolted to the floor Panel shall be supplied and coordinated by boiler manufacturer

7)	ACCESSORIES

A.	Provide smoke indicating and recording system.

1.	Smoke indicating shall be similar to Preferred Instruments JC-30F or Fireye FE-5

2.	For each boiler provide, complete with light source, photoelectric receiver, Ringelmann meter in breeching of boilers and alarm circuits

3.	Locate photoelectric unit and light source unit located in breeching of boilers

4.	Provide pressure-tight flanges in breeching ahead of photoelectric receiver and light source to prevent flue gases from entering boiler room

5.	Stack units with purging air connections shall minimize soot deposit.

6.	Mount indicating meter and lamp unit on Boiler plant control panel and remote visual alarm at each boiler room exit door

7.	Operation: Alarm shall sound and red indicating lamp shall light when density of smoke reaches predetermined value. After set time interval of continued smoke excessive level, smoke controller time delay/relay will shut burner down requiring manual reset to recycle burner after smoke density has declined to acceptable level

a.	When density of smoke is below this value, green indicating lamp shall be lit and red lamp shall be out

NOTE: COORDINATE WITH AUTOMATIC CONTROL SYSTEMS SECTION

8.	Alarm bell shall be as specified under Section AUTOMATIC CONTROLS SYSTEMS may be used

9.	Provide wiring, relays, voltage regulator transformer required for alarm.

10.	Photocell wiring shall be in separate conduit or in shielded microphone cable

11.	Provide density recorders, similar to Fireye Type 55-AMI or Preferred Instruments R88 (Z101) with continuous 24-hour record of percent smoke density on 12 inch chart and supply charts for one (1) year operation

NOTE: USE WHERE GAS PRESSURE FROM UTILITY COMPANY IS INSUFFICIENT FOR PROPER BURNER OPERATION. ADD PIPING DETAIL TO DRAWINGS

B.	Provide centrifugal type gas compressors with direct drive pump, flexible coupling and motor

NOTE: COORDINATE WITH ELECTICAL DEPARTMENT.

1.	Motor controller, mounted on common steel or cast iron base with capacity as scheduled on the drawings, similar to Riesner or Eclipse Fuel Engineering

2.	Operation: Interlock with boiler-burner unit. Compressor operates when one or more gas burners operate

a.	Compressors inoperative when all gas burners are inoperative.

C.	For emergency switches, provide break-glass type disconnect switch, similar to Acme Fire Alarm Co., for operation of boiler plant control panel main remot control contactor. Break glass to release contactor. Locate outside boiler room exits

D.	Fire extinguishers: Provide two NFPA approved, 2-1/2 gal foam type in boiler room

E.	Provide portable type microcomputer combustion analyzer to determine oxygen, carbon dioxide, and carbon monoxide concentration with flue gas and calculate combustion efficiency. Unit shall be similar to Fyrized Model 200

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Piping: Provide gas piping from outlet provided under Plumbing Work with valves and by-passes. Connect to burners and connect to gas compressors, if required

1.	For fuel oil piping, provide valves and by-passes between burners and oil tanks

2.	For boiler pressure gauges, pressure controls, water level controls, water columns and low water cutoffs, provide piping made up with brass plugged tees and/or crosses at each change of direction

3.	Provide blowdown valves for water level controls, water columns and low water cutoffs

4.	For underground oil piping, provide two (2) heavy coats asphaltum.

5.	Pipe blowoff and drain valves to floor drain.

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

B.	Wiring: Feeder and disconnect switch for boiler plant control panel will be as specified under Electrical Work

1.	Provide all other wiring including:

a.	Feeder from disconnect switch to panel and circuit breaker: full size of feeder to disconnect switch

b.	Wiring from panel to equipment.

c.	Wiring for controls, burner cutoff switches, interlocks, emergency switches, alarms and as noted

2.	Install wiring in rigid conduit and in conformance with Specifications for Electrical Work

2)	ADJUSTMENT AND CLEANING

A.	Upon completion, clean boilers, breeching, stack and related piping using cleaner as recommended by boiler manufacturer. Provide instructions, supervision and adjustment

B.	Factory representative of boiler-burner manufacturer shall supervise installation of the unit and controls and start up and adjust burners and controls including burners for optimum fuel-air ratio over entire operating range. Test individual burner controls for proper operation and test safety controls for proper operation. Test boiler safety valves per ASME Code and tes combustion efficiency over full operating range by means of CO2 analysis and exit gas temperature. Set burner firing rates for specified conditions. Instruct Owners' designated personnel in operation of equipment. Instruction period shall be two 7-hour days

C.	Submit written report by boiler-burner manufacturer to the effect that safety and operating controls and burners are properly installed, calibrated, and adjusted

3)	FIELD QUALITY CONTROL

A.	After installation is completed, test boilers hydrostatically in accordance with ASME recommendations. Test operating and safety controls individually by firing boiler, raising steam pressure and lowering water level to ascertain proper pressure and level settings. Tests shall be witnessed and certified by representative of the Hartford Steam Boiler Inspection and Insurance Company. Test shall be witnessed by local authorities having jurisdiction