TECH_EXHIBIT_A_(2)-_AD103249P-RPL_BOILERS_AT_CEP-BLDG_91227.pdf

DPW Specification Jan 11, 2016

2.7.3 Stacks (For Installation Without Flue Gas Scrubbers)

Stacks shall be free standing, dual wall with insulated annular space, self supporting, steel construction. Contractor shall assure that the design of the stack and supporting steel or concrete foundations meets or exceeds the design conditions listed below. Provide each stack complete with accessories and appurtenances, including test ports, sampling platforms, caged safety ladders, anchors, sleeves, insulation, base and chair rings, and cleanout door.

2.7.3.1 Construction

a. Air Space: Provide in the annular air space between the two steel shells insulation with sealing means to accommodate thermal expansion differentials and lateral deflections or sway of the inner and outer shells.

b. Opening Reinforcement: Provide openings with adequate reinforcement to minimize stress concentrations.

c. Inner Shell: Design wall thickness of the inner shell to be 1/16 inch thicker than that required by dynamic and static structural design but not less than 3/16 inch.

d. Outer Shell: Construct of ASTM A242/A242M steel with a plate thickness not less than [_____] inch.

e. Expansion Devices: Construct of corrosion resistant stainless steel suitable for the temperatures and flue gas combinations to be experienced by the stacks.

f. Base construction of the stack shall transmit forces and moments in the shell to the [foundation] [supporting steel] without local stresses of appreciable magnitude being induced in the shell or exceeding the allowable stresses of the supporting [concrete] [steel].

g. Provide openings in breeching and stack for test equipment for sampling flue gas and for metering devices. Openings shall be properly reinforced and designed for differential expansion. Breeching opening shall be of double wall construction. All penetrations through inside shell of stack shall be completely welded to provide proper sealing between the stack and the opening.

h. Provide top 4 feet cone section of the stack of corrosion resistant steel.

i. Anchor Bolts: provide suitable anchor bolts.

2.7.3.2 Construction Accessories

Accessories to be provided:

a. Cleanout Door: Provide double wall insulated steel plate door complete with one inch round hinge pin, gasket and not less than 18 swing bolts.

b. Inspection Trolley: Provide a ring of Type 304 Corrosion Resistant Steel (CRES) to support an inspection or painter's trolley. Weld ring and support from the stack plates with not less that three brackets 3/8 by 2 1/2 by 15 inches. Space brackets at not more than 2 feet on

SECTION 23 52 33.03 20

centers around the circumference of the stack.

Provide a three wheel CRES flat rail trolley of 500 pound capacity. The trolley shall have guides to prevent it from leaving the track and a hole shall be provided in the hinge plate for the attachment of [_____] feet of 1/4 inch CRES plow steel cable.

c. Ladder: Provide each stack with an external ladder with cage for the full height of the stack. Construct ladder and cage of corrosion resistant steel in accordance with ALI/LADDER A14.3.

d. Thermocouples: Provide a flue gas sensing thermocouple well with thermocouple 3 feet above the breeching opening and 5 feet below the top of the stack. The wells shall be CRES and shall extend about halfway into the stack.

2.7.3.3 Finish

Stacks shall be shop coated prior to shipping from the factory.

2.7.3.4 Stack Sampling Platform

Provide stack sampling platform conforming to the requirements of

29 CFR 1910-SUBPART D.

2.7.4 Dampers

2.7.4.1 Multilouver Dampers

Provide factory fabricated multilouver dampers with [parallel] [or] [opposed] blade type operation. Construct damper frame of distortion resistant welded steel channels with raised seat to ensure free nonbinding operation of blades and to keep blades square in the frame. Construct blades of 1/4 inch thick steel plate in a stressed skin airfoil-shape with fully welded seams containing no external ribs. Blade shafts shall be stainless steel. Blades shall be pinned to blade shafts. Louver shaft bearings shall be outboard type and shall be self-lubricating and self-cleaning. Bearing seals shall be gas-tight.

a. Multilouver Damper Linkage: Damper linkage shall be adjustable and of pinned construction for easy removal and shall be designed to handle full operation torque. Linkage on dampers in clean flue gas areas shall operate from a single connection point. Design linkage on dampers in dirty flue gas areas, between boiler outlet and inlet to air pollution equipment, so that the bottom blade linkage arm is not connected to the above linkage, to allow this blade to operate separately. The remaining linkage for this damper shall be constructed to operate from a single operating point.

b. Control Damper Operators: Provide control damper operators as noted.

Operators may be either electrically or pneumatically operated with positive positioning, manual override, and hydraulic or oil immersed gear trains. Each operator shall be full-proportioning type, with spring return to position indicated in case of loss of power. Damper operating speeds shall be selected or adjusted so that the operators will remain in step with the controller. Operators acting in sequence with other operators shall have adjustment of control sequence as required by the operating characteristics of the system.

c. Two-Position Damper Operators shall be pneumatically operated with air cylinder, four way valve, and solenoid valve arrangement.

2.7.4.2 Guillotine Dampers

Provide factory fabricated guillotine dampers with heavy structural frame rigid enough to support the extended blade and external loads through the breeching flange. Damper shall be capable of operating without precleaning or manual assistance under normal operating conditions. Enclosed bonnets will only be required where indicated. Provide three inch diameter cleanout ports on both sides for cleaning bottom sections.

a. Guillotine Damper Blades: Provide stress-relieved flat plate guillotine damper blades. Damper blade shall be nonwarping.

Intermediate blade supports are acceptable to limit blade deflection.

The leading edge of the damper blade shall be beveled and capable of guiding damper blade into frame seat. Blade guides shall be continuous and self cleaning and capable of preventing binding from deposits and damage from misalignment. Bonnet guides shall be removable. Design damper so that a damper blade can be replaced without opening the frame.

b. Guillotine Damper Bonnet Seal: Provide bonnet seal to effectively seal against atmospheric leakage under normal operating conditions.

c. Guillotine damper drive shall be a positive dual endless chain drive capable of driving damper in both directions. Chain drive headshaft shall have sufficient torsional rigidity to prevent binding of blade if the blade is stalled. Damper shall be motor operated with manual override. Design drive mechanism to prevent back driving of motor.

Entire drive mechanism shall be of a simple design and require no routine maintenance other than inspection. Chain shall be capable of operating up to the stall torque of the damper drive motor.

d. Electric Motor: Shall be [_____] volt, [_____] phase, 60 Hz, [totally enclosed, fan cooled] [open drip-proof], not less than [_____] hp, as specified under "Motors and Drives" in this section. Provide removable, totally enclosed chain guard.

2.7.5 Sampling Ports

Weld two sampling ports to [breeching] [stack] at 90 degrees apart. Each port shall consist of a section of 4 inch diameter steel pipe with threaded cap.

2.8 FUEL OIL SYSTEM

Provide fuel oil system as specified in Section 33 52 10 SERVICE PIPING, FUEL SYSTEMS, for tanks located above grade, and Section 33 56 10 FACTORY-FABRICATED FUEL STORAGE TANKS, for tanks below grade.

2.9 MISCELLANEOUS EQUIPMENT

2.9.1 Condensate Receiver

Provide a [horizontal] [vertical] type tank not less than [_____] feet [_____] inches in diameter by [_____] feet [_____] inches [long] [high] overall with a storage capacity of not less than [_____] gallons. Tank shall be constructed of welded steel plate not less than 3/8 inch thick.

Provide condensate tank with a 24 inch diameter manway, dual gage glasses with protective guards, saddles, and other connections as indicated.

2.9.1.1 Coating

Surface blast interior of tank to bare metal and coat with a baked-on phenolic lining or corrosion resistant liner consisting of a resin and hardener suitable for immersion in water at not less than 250 degrees F.

Coat tank exterior with one shop coat of manufacturer's standard primer rated for service of not less than 250 degrees F.

2.9.1.2 Accessories

Provide the condensate receiver with the following:

a. Connections for condensate pumped return, vent, water outlet, drain, sampling outlet, level transmitter and controls.

b. [_____] inch vent.

c. Reflex type water gage glasses with shutoff valves and guards.

d. One, 5 inch dial, thermometer, 50 to 300 degree F range, with lagging extension type wells, for steam and water space.

e. [_____] inch overflow trap.

f. One high water alarm switch with stainless steel float and trim.

Circuit shall close as liquid level rises. Locate switch to close circuit when water level rises to one inch below overflow level of receiver.

g. One low water alarm switch with stainless steel float and trim. Close circuit as liquid level falls. Locate switch to close circuit when water level drops to 25 percent of the storage capacity of the storage tank.

h. Install switches on a single column with valved connections to tank.

Provide unions in pipe on each side of each float switch.

i. Furnish pipe, fittings, controls, specialties, bolts, gaskets, drains, valves, necessary for a complete unit. Install at the jobsite.

j. Provide automatic control system to control level in condensate tank by modulating discharge from condensate pumps.

2.9.2 Deaerating Heater

2.9.2.1 General

Provide a deaerating feedwater heater with storage tank conforming to FS W-H-2904 and to ASME BPVC SEC VIII D1, except as modified below. Tank shall be ASME Code stamped. Provide stainless steel trays. No test model will be required.

Model A - Pressurized operation.

Type I - Tray-type heating and deaerating element.

Class 3 - 10 minute water storage capacity (minimum).

Grade A - Guaranteed removal from water of dissolved oxygen in excess of

0.0012 in3/gal, over a ten to one load swing.

2.9.2.2 Heater Capacity

Provide deaerating heater capable of heating and deaerating makeup water consisting of [_____] pounds per hour of softened makeup water from [_____] degrees F to [_____] degrees F (outlet temperature).

2.9.2.3 Inlet Water Characteristics

Softened makeup water:

Ph: [_____] Total hardness (as CaC03): [_____]

2.9.2.4 Storage Tank

Horizontal design with steel supports [drilled for bolting] of approved design. Provide storage tank with not less than a 16 by 20 inch minimum size manhole and cover and provide heater section with not less than a 12 by 18 inch minimum size tray access handhole and door.

2.9.2.5 Vent Condensing Arrangement

Provide the deaerating heater with a vent condenser which shall condense the vented steam when the heater is operating at full capacity with the inlet water mixture at a temperature not exceeding 180 degrees F.

Construct the vent condenser, when of the direct contact type, with stainless steel baffling.

2.9.2.6 Materials

Construct trays, tray supports, water distributors, and other parts coming in contact with undeaerated water or air laden steam of 430 stainless steel.

2.9.2.7 Accessories

Provide deaerating heater with the following accessories:

a. Pressure Relief Valve: Sized in accordance with FS W-H-2904.

b. Thermometers: Two, 5 inch dial thermometers, 50 to 300 degrees F, with lagging extension type wells for the storage tank and the heater section. Provide a thermometer similar to above but with range of minus [_____] degrees F to plus [_____] degrees F for the makeup water connection.

c. Lifting attachments for the tray section and the storage tank.

d. Water Gage Glasses: Reflex type with shutoff valve and guards.

e. Pressure Gages: One 6 inch dial compound pressure gage for the heater section with range from [_____] inches of mercury (vacuum) to [_____] psig.

f. Float Controllers:

(1) Inlet condensate controller

(2) Makeup water controller

(3) Overflow controller

g. Overflow Control Valve: With pneumatic controller arranged for local automatic operation.

h. Storage Tank Gage Glass: Full height, shielded, for storage tank including shutoff valve and drain cocks.

i. Makeup Water Inlet Control Valve: With pneumatic controller.

j. Switches: For low water level alarm in the storage tank, high water level alarm, condensate pump shutdown in the storage tank, and low steam pressure alarm. Install switches on a single column with connections valved and unions provided in pipe on each side of each float switch.

k. Special tools: One set for maintenance.

l. Condensate Pump Reset: With stainless steel float and trim to reset pump shutdown switch on fall of liquid level in tank to [_____] inches below level of overflow level of storage tank.

m. Furnish pipe, fittings, controls, specialties, bolts, gaskets, drains, and valves, necessary for proper attachment of accessories and trimmings and install.

[n. Oil separator]

2.9.2.8 Connections

Provide necessary connections for condensate, steam, makeup water, removal of vented gases, vacuum breakers, discharge of deaerated water, and instruments and controls.

a. Provide heater connections as follows:

(1) [_____] inch steam inlet

(2) [_____] inch makeup water inlet

(3) [_____] inch condensate

(4) [_____] inch high pressure trap return

(5) [_____] relief valves sized as required

(6) [_____] inch vent

(7) [_____] inch for thermometer well

(8) [_____] inch for pressure gage

(9) Vacuum breakers as required

(10) [_____] inch heater drain

(11) [_____] inch spare [capped] [flanged]

(12) [_____] inch spare [capped] [flanged]

(13) Handholes and manhole with covers

b. Tank connections shall include:

(1) [_____] inch drain

(2) [_____] inch boiler feed recirculation ([_____] required)

(3) One inch sampling

(4) One inch chemical feed

(5) [_____] inch for sight glass ([_____] sets required)

(6) [_____] inch for high and low level alarm switches

(7) [_____] inch thermometer well

(8) Vacuum breakers as required

(9) [_____] inch spare (capped)

(10) [_____] inch spare (flanged)

(11) [_____] inch level transmitter and controller ([_____] sets required)

(12) Downcomer and equalizer as required

(13) [_____] inch feedwater outlet

(14) [_____] inch overflow outlet with internal water seal

2.9.2.9 Level Control

Provide an automatic control system to control water level in the storage tank, by modulating valves in makeup water lines. Condensate pump output shall be controlled by level in condensate storage tank.

a. Controllers: Provide external cage type air operated level controllers for both the condensate and makeup water lines complete with 1 1/2 inch screwed connections, external cage, and controller. Cage body shall be Class 125 cast iron construction. Internal components including displacer, torque tube, displacer rod, displacer rod driver and bearings shall be 316 stainless steel. Displacer shall be 14 inches long. Controller shall be direct acting with 3 to 15 psig range with proportional band adjustment. Locate controller to maintain an operating level at 2/3-full point of storage tank. Provide level controller with air pressure reducing valve, filter, gages and isolating valves for float cage. Provide unions on each side of float cage.

b. Air Operated Regulating Valves: Provide air operated control valves for both the condensate and makeup water lines. Valves shall have

Class 125 or Class 150 rating with iron or semi-steel bodies and 316 stainless steel internals. Provide condensate valve which fails open on loss of air and makeup water valve with an air lock mounted on valve diaphragm to hold valve in last position on loss of air. Design valves for the following conditions:

Condensate Makeup Water

Valve size [_____] inch [_____] inch

Capacity [_____] gpm [_____] gpm

Maximum pressure drop at above capacity

[_____] psig [_____] psig

Available pressure [_____] psig [_____] psig

Minimum Cv at 100 percent open [_____] [_____]

2.9.2.10 Low Pressure Steam Control

Provide an automatic control system to control the steam to the deaerating heater. Maintain steam pressure in the heater by modulating a pressure reducing valve in the steam supply line. Control shall be local and remote from the control panel.

a. Controller: Adjustable proportional band, 0 to 15 psig brass bellows for input signal, and 3 to 15 psig output air pressure range, pilot controller complete with air set (valve, filter, drier and pressure regulator) mounted on control valve yoke.

b. Pressure Reducing Station Control Valve: Provide a [_____] inch air operated pressure reducing valve with proper internals to pass a flow of [_____] pounds per hour of steam. Steam at the valve inlet shall be [_____] psig saturated, and the outlet shall be controlled at [_____] psig. Minimum steam flow shall be approximately [_____] pounds per hour.

Minimum valve Cv shall be [_____] at 100 percent open. Valve shall be Class 250 or Class 300 flanged, iron or semi-steel body with stainless steel internals equal percentage flow characteristics and a full size port. Provide valve actuator including travel indicator, hand jack, valve positioner, and air supply filter-reducer set. Valve shall move to open position in case of failure.

2.9.2.11 Gage Glasses

Provide gage glasses to cover the entire range of water level in the storage section. Gage glasses shall not be greater than 24 inches center-to-center. Provide gage glasses complete with [chain operated] ball check shutoff and drain cock valves and safety shield.

2.9.2.12 Alarms

Provide high and low water level alarms for storage tank as follows:

a. High Water Level Alarm: Switch with stainless steel float and trim.

Locate switch to close circuit when water level rises to one inch below overflow level of storage tank.

b. Low Water Level Alarm: Switch with stainless steel float and trim.

Locate switch to close circuit when water level falls to [_____] feet [_____] inches above bottom of storage tank.

c. Coordination: Coordinate alarms with annunciator panel as indicated.

2.9.2.13 Multiport Back Pressure Relief Valve

Provide valve capable of relieving not less than [_____] pounds per hour of steam with not more than a [_____] psig pressure rise when set at [_____] psig initial operating pressure. Set pressure shall be fully adjustable by means of an external handwheel or chain operator for a range of zero to 25 psig. Locate on low pressure steam header manifold for the deaerating heater. Valve shall be multiport vapor cushion type rated for operating temperatures up to but not greater than 300 degrees F with Class 125 cast iron body, bronze trim and carbon steel springs.

2.9.2.14 Exhaust Head

CID A-A-50494, Type [I (cast iron)] [II (fabricated steel plate)] of [_____] inch size with [_____] inch diameter drain, and a capacity of [_____] pounds per hour of steam at [_____] psig.

2.9.3 Boiler Feed Pumps

CID A-A-50562, Type II (boiler feed pump), Style 1 (horizontally split case), Class 2 (multi-stage) except as modified below. Each pump shall be two stage with horizontal split casing, enclosed single suction opposed type impellers, renewable casing and impeller wearing rings, stuffing box with quenching gland and flooded oil lubricated, water cooled bearings.

2.9.3.1 Pump Service Requirements

a. Capacity: [_____] gpm

b. Pumping temperature: [_____] degrees F

c. Liquid pH: [_____]

d. Discharge head: [_____] feet

e. Available NPSH: [_____] feet

f. In addition to the operating point established above, the pump curve shall also run through the following points:

Capacity Discharge Head

[_____] gpm [_____] feet

[_____] gpm [_____] feet

2.9.3.2 Construction

Boiler feed pumps shall be bronze fitted including bronze impeller and impeller wear rings, and ASTM A48/A48M, Class 30, cast iron casing.

Provide casing with suction and discharge gages in tapped openings. Mount each pump and prime mover on a fabricated steel bed plate having a drip collection chamber with tapped drain openings. Provide lifting attachments to enable equipment to be set into its normal position and to enable pumps to be easily dismantled in place.

2.9.3.3 Electric Motors

[Variable speed], [open dripproof], [totally enclosed], [fan cooled], [_____] volt, three phase, 60 Hz of not less than [_____] hp, as specified under "Motors and Drives" [and "Variable Speed Control For Motors"] in this section. [Variable speed] electric motors [or turbines] direct connected to respective pumps with a gear type, forged steel, flexible coupling.

Provide a shaft and coupling guard.

2.9.3.4 Steam Turbines

Single stage, rated at not less than [_____] hp, with inlet steam pressure of [_____] psig and [_____] degrees F and normal exhaust back pressure of 5 psig or a maximum back pressure of 15 psig. Water rate at full load and normal steam conditions shall not exceed [_____] pounds per BHP per hour.

Provide a stainless steel steam strainer, sentinel relief valve, sight oil level indicator and one hand valve. [Variable speed] turbines direct connected to respective pumps with a gear type, forged steel, flexible coupling. Provide a shaft and coupling guard.

a. Turbine Construction: Turbine casing split on the horizontal centerline constructed of ASTM A48/A48Mcast iron, with a design pressure rating of 250 psig at 450 degrees F at inlet, and 55 psig at 450 degrees F at the outlet.

b. Turbine Bearings and Shaft: Horizontal split, ring oiled, sleeve type, water cooled. The shaft shall be stainless steel or chrome plated under the packing glands. The shaft seals shall be segmented carbon rings with springs and stops.

c. Speed Governor: Variable speed oil relay, NEMA Class D governor for speed control and pneumatic operator to maintain an adjustable, preset pump discharge header pressure by variation of turbine speed. Input to the operator shall be a 3 to 15 psig pneumatic signal. Provide an electro-pneumatic transducer to accept the 4 to 20 mA signal from the control system controller specified in VAMS Section 23 09 53.00 20

SPACE TEMPERATURE CONTROL SYSTEMS.

d. Emergency Overspeed Governor: Completely independent of the speed governor and shall operate trip valve.

e. Insulation: Turbine shall be insulated and lagged by the manufacturer as specified in Section 23 07 00 THERMAL INSULATION FOR MECHANICAL

SYSTEMS.

2.9.3.5 Minimum Flow Protection for Boiler Feed Water Pumps

a. Automatic Flow Control Valve: Provide with each pump an automatic bypass valve. Valve shall automatically program the recirculation flow, the detection of low flow, the cycling of control valve and pressure letdown for high pressure boiler feedwater return to the feedwater heater. Bypass valve shall be cast steel with stainless steel internals, and shall have a rating of not less than 300 psig at 400 degrees F. Valve shall have a line size body with a one inch recirculation connection.

b. Boiler Feedwater Automatic Recirculation System: (Option to Automatic Valve). Provide a boiler feedwater automatic recirculation system to protect the feedwater pumps at low flow conditions. System shall be capable of recirculating the minimum flow recommended by the pump manufacturer. The system shall be an engineered system consisting of the various functional components specified or shall be a self-contained and self-powered mechanical system. Components of the engineered system shall include a flow transmitter with orifice in feedwater line, bypass flow controller with bypass flow control valve, and a bypass pressure reducing orifice.

(1) System Bypass Flow Controller: Include detection of low flow and modulation of a control valve in a bypass line returning to a low pressure sink. Incorporate a pressure let-down feature or device to reduce the pressure from the boiler feedwater pump discharge pressure to that of the low pressure sink.

(2) System Bypass Control Valve: Modulate to provide minimum flow recommended by the pump manufacturer and to provide shutoff or recirculation flow when feedwater flow to the boilers exceeds the minimum flow required for pump protection.

c. Feedwater Stop and Check Valves: Provide a Class 300, flanged, cast steel feedwater stop gate valve and check valve on the feedwater outlet of each pump. Provide piping from the valves to the economizer inlet, and from the economizer to the flanged connection on the boiler drum.

Provide connection on pipe at economizer outlet for remote recording thermometer.

2.9.4 Condensate Pumps

CID A-A-50562, Type I, Style [1 (horizontally split case)] [2 (end suction)], Class 1 (single stage) unless modified below.

2.9.4.1 Condensate Pump Service Requirements

a. Capacity: [_____] gpm

b. Pumping temperature range: [_____] to [_____] degrees F

c. Liquid pH: [_____]

d. Discharge head: [_____] feet

e. Available NPSH: [_____] feet

f. In addition to the operating point established above, the pump curve shall also run through the following points:

Capacity Discharge Head

[_____] gpm [_____] feet

[_____] gpm [_____] feet

2.9.4.2 Construction

Condensate pumps shall have bronze impellers and impeller wear rings. Pump casings shall be [cast iron] [ductile iron], and shall be designed for the specified conditions. Bearings shall be oil lubricated. Casings shall have tapped openings for suction and discharge pressure gages. Provide suction and discharge pressure gages in openings. Mount pump and driver on a fabricated steel bed plate having a drip collection chamber with tapped drain openings. Provide lifting attachments for installation and maintenance.

2.9.4.3 Electric Motors

[Variable speed], [open dripproof], [totally enclosed], [fan cooled], [_____] volt, three phase, 60 Hz of not less than [_____] hp, as specified under paragraph entitled "Motors and Drives" [and "Variable Speed Control For Motors"] in this section. [Variable speed] electric motors direct connected to the respective pumps with a gear type flexible coupling.

Provide shaft and coupling guards.

2.9.4.4 Steam Turbines

Single stage, rated at not less than [_____] hp, with inlet steam pressure of [_____] psig and [_____] degrees F, normal exhaust back pressure of 5 psig and a maximum back pressure of 15 psig. Water rate at full load and normal steam conditions shall not exceed [_____] pounds per BHP per hour.

Provide a stainless steel steam strainer, sentinel relief valve, sight oil level indicator and one hand valve. [Variable speed] turbines direct connected to the respective pumps with a gear type flexible coupling.

Provide shaft and coupling guards.

a. Turbine Construction: Turbine casing split on the horizontal or vertical centerline constructed of ASTM A48/A48M cast iron, with a design pressure rating of 250 psig at 450 degrees F at inlet, and 55 psig at 450 degrees F at the outlet.

b. Turbine Bearings Shaft: Ring oiled, anti-friction type. Shaft shall be stainless steel or chrome plated under the packing glands. Shaft seals shall be segmented carbon rings with springs and stops.

c. Speed Governor: Variable speed governor for speed limiting and pneumatic operator to maintain an adjustable preset level in [deaerator tank] [condensate receiver] by variation of turbine speed. Input to the operator shall be a 3 to 15 psig pneumatic signal and vary the turbine speed from minimum to full speed in a linear response. Maximum and minimum speed shall be adjustable. Provide an electro-pneumatic transducer to accept the 4 to 20 mA signal from the controller specified in VAMS Section 23 09 53.00 20 SPACE TEMPERATURE CONTROL

SYSTEMS.

d. Emergency Overspeed Governor: Completely independent of the speed governor and shall operate a separate trip valve.

e. Insulation: Turbine shall insulated and lagged as specified in Section

23 07 00 THERMAL INSULATION FOR MECHANICAL SYSTEMS.

2.9.5 Variable Speed Motor Controller

Remotely installed cabinet housed units with solid state rectification and inverter equipment to vary frequency of electrical power to the drive motors.

2.9.5.1 Housing

House the controller in a [wall] [floor] mounted, NEMA [_____] enclosure finished with manufacturers standard painted finish. Provide control panel complete with fused disconnect switches, magnetic [across the line] [part winding] starters with thermal overload protection, transformer, hand-off-automatic selector switches, hand potentiometer for manual speed control, fuses and running lights.

Manual Switch: Locate the manual switch within the control panel so that in the event failure of any of the components the motor can be put across the line at full voltage to maintain air or pump pressure. Provide a mechanical door interlock that allows the panel to open only when the fused disconnect is in the off position.

2.9.5.2 Variable Frequency Controllers

Variable frequency controllers shall use solid-state semiconductor power conversion equipment. Provide controllers as integrated and assembled products. Controllers shall be furnished by the same manufacturer.

2.9.5.3 Ratings

Each controller shall be rated for a supply of [_____] volts, three phase, 60 Hz. The output shall be [_____] volts, three phase with frequency variable between zero and 60 Hz. Controllers shall be rated to operate the motors continuously at their rated horsepower and frequency. Speed regulation shall be within (plus or minus) three percent of set point without tachometer feedback. Electrical supply system shall have an available short circuit rating of [_____] amperes symmetrical.

2.9.5.4 Minimum Speed

Each controller shall be capable of driving the motor continuously at a lower speed no greater than 20 percent of full rated motor speed with stable operation and without overheating the motor under rated ambient conditions. Provide estimate of minimum speed at which motor can be operated continuously without overheating or problems of instability due to overhauling of the load.

2.9.5.5 Fault Protection

Provide controller fault protection so that a single or three phase short circuit at the controller terminals or inverter commutation failure will not result in damage to power circuit components. Provide overload protection so that motor and controller are protected against operating overloads.

2.9.5.6 Time Delay

Provide adjustable time delay under voltage protection so that motors will continue to operate during momentary voltage fluctuation or loss of voltage. Time adjustment shall be zero to 5 seconds. Provide for orderly shutdown on undervoltage conditions exceeding the time delay interval.

2.9.5.7 Acceleration/Deceleration

Provide adjustable timed linear acceleration and deceleration.

2.9.5.8 Voltage/Frequency Control

Provide volts/Hz control to prevent motor overheating throughout the speed range.

2.9.5.9 Door Interlocks

Provide door interlocks to prevent opening of enclosure doors unless power is disconnected.

2.9.5.10 Shutdown Conditions

Controllers shall be self protecting and shall provide orderly shutdown for, but not limited to, the following conditions:

a. Loss of input power

b. Undervoltage

c. Sustained gradual overload

d. Fault or large instantaneous overload

e. Overtemperature

f. Failure of ventilating system

g. Overvoltage

h. Control circuit failure

Provide contacts for remote annunciation of shutdown or abnormal condition.

2.9.5.11 Electrical Bypass

Provide each controller with manual isolation and bypass switching. Switch shall be manually operated with controller deenergized. Switch shall be two position with provisions for locking the switch in either position.

a. Normal Position: Bypass shall be open and connect controller to the supply circuit and the load.

b. Bypass Position: Bypass shall be closed and the controller shall be electronically isolated from the supply and the load. Isolating contacts shall be located so that it is possible to verify by visual inspection that the contacts are open and the controller is electrically isolated. In the bypass position the motor shall be operated at constant speed and controlled from the air circuit breaker. Provide auxiliary contacts that close in the bypass position. Auxiliary contacts shall be used to activate the damper control to provide fan load control in the bypass position.

2.9.5.12 Controller Environmental Protection

a. Ventilation: Design controllers enclosed and ventilated for installation in a moderately dusty area. Provide forced filtered ventilation including fans, filters, controls and accessories required for operation. Enclosures shall be operated under positive pressure at all times. Provide filtered ventilating openings and gasketed doors to prevent infiltration of dust.

b. Heating: Provide electric heaters to prevent condensation in the enclosure and to prevent low ingoing air temperatures that exceed the equipment rating. Provide a low temperature alarm to sound when enclosure temperature falls below required minimum temperature.

Provide contacts for remote annunciation of alarm condition.

2.9.5.13 Method of Control

Supply each controller from an electrically operated air circuit breaker or motor starter. Controller ventilation and heating shall be from another circuit.

a. Start Signal: Closes the electrically operated air circuit breaker or motor starter to energize the controller. The controller shall accelerate the fan to operating speed. Fan speed shall be controlled from the load control signal.

b. Stop Signal: Opens the electrically operated air circuit breaker or motor starter to deenergize the controller. Upon deenergization, the controller control system shall revert to the stop condition.

c. Boiler Feedwater Pump Speed Control System: Matches pump discharge to system demand and maintains a system header pressure controlled to the set point values. Provide Manual/Automatic control stations for master pressure and for each boiler feed pump. Provide indicators for feedwater header pressure and individual boiler feedwater pump flow.

See VAMS Section 23 09 53.00 20 SPACE TEMPERATURE CONTROL SYSTEMS.

2.9.6 Valve Actuators

[Electrically] [or] [pneumatically] operated and designed so that valve may be manually operated by removing the drive pins. Actuators shall be operated by push button control. Locate one push button at a position adjacent to the valve. Locate a second push button within the boiler control room. Provide a valve position indicator utilizing indicating lights. A green light shall indicate the valve is fully open and an amber light shall indicate the valve is fully closed. Both lights on shall indicate when the valve is partially open. [Provide torque limit controls to protect the valve during opening and closing for electrically operated valves.] Actuator electric motor shall be totally enclosed, [_____] volts, [_____] phase, 60 Hz as specified under paragraph entitled "Motors and Drives" in this section. Provide NEMA 4 control enclosures.

2.9.7 Sump Pumps

CID A-A-50555 with automatic float switch and disconnect switch in NEMA 6 enclosure.

2.9.8 Water Softening System

Ion exchange resin type conforming to WQA S-100 except as modified below.

[Manual] [Push button automatic] [Fully automatic] in operation with operating controls housed in a NEMA 12 enclosure having a total capacity between regenerations of not less than [_____] gallons of water of [_____] grains hardness when operated at a sustained softening rate of [_____] gpm.

The maximum effluent water temperature shall be [_____] degrees F.

2.9.8.1 Raw Water Analysis

The source of the raw water is [_____]. It is available at pressures of [_____] to [_____] psig. The analysis of the water available for makeup is approximately as follows:

TABLE 1: MAKEUP WATER ANALYSIS

Constituent Analysis Parts Per Million

Cations Calcium (Ca++) as CaCO3 [_____]

Magnesium (Mg++) as CaCO3 [_____]

Sodium (Na+) as CaCO3 [_____]

Hydrogen (H+) as CaCO3 [_____]

TOTAL

CATIONS

as CaCO3 [_____]

Anions Bicarbonate (HCO3 -) as CaCO3 [_____]

Carbonate (CO3 --) as CaCO3 [_____]

Hydroxide (OH -) as CaCO3 [_____]

Sulfate (SO4 --) as CaCO3 [_____]

Chloride (Cl -) as CaCO3 [_____]

Phosphate PO4 ---) as CaCO3 [_____]

Nitrate (NO3 -) as CaCO3 [_____]

TOTAL

ANIONS

as CaCO3 [_____]

TABLE 1: MAKEUP WATER ANALYSIS

Total hardness as CaCO3 [_____]

Methyl orange alkalinity as CaCO3 [_____]

Phenolphthalein alkalinity as CaCO3 [_____]

Iron, total as Fe [_____]

Carbon dioxide as Free CO2 [_____]

Silica as SiO2 [_____]

Suspended solids (Turbidity)

Total dissolved solids (TDS)

Free acids [_____]

Color [_____] pH [_____]

Specific Conductance Microhms/cm

2.9.8.2 Softener Effluent Analysis

a. Hardness: Maintain hardness of the softened feedwater near zero and in no case allow it to exceed 1.0 ppm (parts per million) as CaCO3.

b. Total Solids: Maintain total solids in the softened feedwater at a level to ensure a total solids concentration in the boiler water of less than 3,500 parts per million (ppm) without excessive blowdown.

2.9.8.3 Softener Equipment

Including but not limited to the following:

a. Water Hardness Monitor: Provide a water hardness monitor with an alarm point at 1.0 ppm to ensure compliance for boilers rated above 25,000 lb/hr.

b. Total Solids Monitor/Controller: Provide a continuous monitor and controller (when required) to control the concentration of dissolved solids and treatment chemicals in the water for boilers rated above 25,000 lb/hr.

c. Water Meter: Provide a [_____] inch cold water meter on each softener unit.

d. Ion Exchange Resin: High capacity, polystyrene base, sulfonated synthetic type except that the exchange capacity shall be not less than 30 kilograins per cubic foot at a salt dosage of 15 pounds per cubic foot.

e. Tank Sizing: Minimum acceptable bed depth of 30 inches; maximum acceptable bed depth of 72 inches. Base reactor tank sizes on allowing a freeboard above the resin bed of not less than 75 percent of the resin bed depth, and flow rate between 0.5 and 3.2 gpm per cubic foot of resin.

2.9.8.4 Brine Storage System

Provide a complete brine storage system including fiberglass storage tank, sight level gage, bulk salt delivery tube, internal distribution system, level control system, tank vent with dust collection system, top and side manholes, access ladder, and other required appurtenances.

2.9.8.5 Brine Storage System Accessories

Provide the following accessories:

a. Steel holddown lugs securely bonded to the tank in adequate number to properly anchor tank to concrete base;

b. Side bottom flanged drain not less than 4 inches in diameter;

c. Side and top manholes not less than 22 inches in diameter;

d. Flanged top connections for delivery pipe and vent;

e. Ladder for access to top manhole;

f. Water inlet connection;

g. Brine outlet connection;

h. Level control system; and

i. Sight level gage.

2.9.8.6 Storage Tank

Filament wound fiberglass with flat bottom and domed top as recommended by the manufacturer for brine storage. Tank shall be [_____] feet [_____] inch in diameter by [_____] feet[_____] inch wall height with a nominal capacity of [_____] gallons and a dry salt storage capacity of [_____] tons.

Design the water distribution system, internal piping distributors, and brine collection system so that the system shall be capable of dissolving [_____] pounds of rock salt per minute to produce [_____] gallons per minute of brine. System shall be able to dissolve [_____] tons of salt before cleanout.

a. Pneumatic Delivery Pipe: Not less than 4 inches in diameter.

b. Dust Collection Vent System and Safety Relief Valve: Provide storage tank with dust collection vent system and safety relief valve.

c. Access Ladder: Of steel construction to be bolted to tank by means of fiberglass reinforced plastic mounting lugs complete with safety cage.

Platform shall connect the ladder to the tank for safe access to the manhole. Safety requirements shall be in accordance with

ALI/LADDER A14.3.

d. Tank Internals: Construct tank internals including water distribution piping and brine collectors of fiberglass reinforced plastic (FRP) or polyvinyl chloride (PVC).

e. Tank Nozzles: ASME B16.5, Class 150, reinforced FRP or PVC flanges.

f. Level Control System: Electrode holder and electrodes mounted in a standpipe exterior to the tank. Position electrodes so that a solenoid operated water makeup valve will be opened or closed to maintain the liquid level to within plus or minus one inch of the set level.

Provide tank with a high water alarm. Electrodes shall be easily removable for cleaning and constructed of materials, that will allow continual immersion in brine.

2.9.9 Chemical Feed Systems

Provide systems complete with storage tank, supporting framework, hinged cover, mixer, strainers, level indicators, proportioning pumps, relief valves and interconnecting piping for a complete chemical feed packaged unit.

2.9.9.1 Storage Tank

50 gallon capacity constructed of fiberglass reinforced plastic. Provide removable, hinged cover.

2.9.9.2 Exterior Gage Glass

Protected, full height of the tank complete with gage cocks.

2.9.9.3 Low Level Alarm

Provide tank with a low level switch to sound alarm and shut down pumps should level drop to preset minimum.

2.9.9.4 Dissolving Baskets

Construct baskets of a corrosion resistant material suitable for continuous immersion in a [_____] solution.

2.9.9.5 Tank Strainer

Install tank strainer in suction line to pump.

2.9.9.6 Supporting Steelwork

Provide supporting steelwork to adequately support tank, mixer, and the number of proportioning pumps specified.

2.9.9.7 Agitator

Provide an agitator with mounting bracket to mount to storage tank.

Agitator shaft and propeller shall be of stainless steel.

2.9.9.8 Proportioning Pumps

Provide [two] [three] [_____] proportioning pump[s] of the [simplex] [duplex] type. Each pump shall have a minimum capacity of [_____] gallons per hour at a [_____] psig discharge pressure. Capacity shall be adjustable from zero to 100 percent by a convenient screw adjustment of stroke length. Provide pump with integral check valves. Electric motors shall be [totally enclosed], [fan cooled], [_____] volts, [_____] phase, 60 Hz as specified under paragraph entitled "Motors and Drives" in this section.

2.9.9.9 Safety Relief Valve

Provide safety relief valve for each pump to discharge back into the tank in event of excessive line pressure.

2.9.10 Blowdown Tank

Provide a welded blowdown tank in accordance with NBBI NB-27, (supplemental to the National Board Inspection Code) latest edition published by the National Board of Boiler and Pressure Vessel Inspectors, Columbus, Ohio.

2.9.10.1 Construction

Construct equipment and accessories in accordance with the requirements of the ASME BPVC SEC VIII D1 for a working pressure of at least the maximum allowable working pressure of the boiler but in no case shall the plate thickness be less than 3/8 inch. Provide corrosion allowance of [0.1 inch] [_____]. Tank dimensions shall be [_____] feet [_____] inches O.D. by [_____] feet [_____] inches long over the heads (overall). Provide tank with wear plate not less than 3/8 inch thick and [ 11 by 15 inch] [ 18 by 20 inch] manhole.

2.9.10.2 Tank Connections

Provide the following connections:

a. Blowdown inlet for bottom blowdown [3/4] [1] inch;

b. Tangential blowdown inlet [_____] inch;

c. Steam vent, flanged [_____] inch;

d. Discharge water outlet, flanged [_____] inch with internal water seal and 3/4 inch siphon breaker;

e. Two inch drain;

f. Thermometer connection 3/4 inch;

g. Pressure gage connection 1/4 inch;

h. Cold water inlet [_____] inch with temperature regulating valve and backflow preventer; and

i. Two gage glass connections 1/2 inch.

2.9.10.3 Angle Supports and Coating

Provide tank with steel angle support legs extending [_____] feet below bottom of the tank. Coat tank with one coat of manufacturer's standard high temperature primer.

2.9.10.4 Accessories

a. Gage Glass: 12 inch reflex type with shutoff valves and guard;

b. Thermometer: Bi-metal dial type with separable socket, 5 inch dial, 50 to 300 degrees Frange;

c. Pressure Gage: Zero to 25 psig range; and

d. Internal Baffles and Pipes: As detailed.

2.9.10.5 Controls

Provide a self operating regulator to control the flow of cooling water to the tank. Regulator shall include a 3/4 inch screwed bronze body with stainless steel trim, reverse acting actuator (for cooling), capillary tubing and a union connection bulb with a stainless steel well. Control setting shall be 140 degrees F with a minimum Cv of [_____].

2.9.11 Continuous Blowdown System

Provide a complete automatic continuous boiler blowdown system which shall include a controller/programmer unit and flow assembly for each boiler, plus a continuous blowoff heat exchanger, flash tank and boiler water sample cooler.

2.9.11.1 Automatic Blowdown Controller

Intermittent type boiler blowdown system rated for not less than 250 psig steam pressure.

2.9.11.2 Flow Assembly

Include a one inch ball valve with 316 stainless steel ball and stem and stainless steel electrode assembly.

2.9.11.3 Controller/Programmer

Include a conductivity meter with zero to 6000 microhms range, valve open/closed indicators and manual/auto control switch. Cycle interval and sample duration shall both be adjustable over a wide range. Mount units at operating floor near boiler front.

2.9.11.4 Accessories and Connections

a. Continuous Blowdown Connection: At each boiler, provide a gate valve and extend piping to header at flash tank.

b. Header Connections: Provide with a tee with valved sampling connection. Provide a3/4 inch, three globe valve bypass around each flow assembly.

c. Common Header: Provide from valved outlet connections on flow assembly units to connection on flash tank.

2.9.11.5 Flash Tank

Designed for [_____] psig and constructed in accordance with the ASME BPVC SEC VIII D1. Tank shall be [_____] inches in diameter by [_____] inches long including heads and shall be ASME Code stamped.

2.9.11.6 Blowdown Inlet

Provide tank with blowdown inlet, steam outlet, gage glass, float operated outlet valve, relief valve, and inspection openings. Tank shall have steel angle legs with plate feet for bolting to floor and legs shall be of sufficient length so that bottom of lower head of tank will be not less than 18 inches above floor.

2.9.11.7 Automatic Control System

Control level in the flash tank, by modulating a valve in the water outlet line.

a. Level Controller: External cage type air operated level controller, complete with 1 1/2 inch screwed connection, 14 inch stainless steel float and Class 125 cast iron body. Controller shall be direct acting with 3 to 15 psig range with proportional band. Locate controller to maintain an operating level at center line of storage tank. Provide level controller with air pressure reducing valve, filter, gages and isolating valves for float cage. Provide unions on each side of float cage.

b. Outlet Water Valve: [_____] inch air operated control valve with a capacity to pass [_____] gpm at a pressure drop of [_____] psig. Cv shall not be less than [_____] at 100 percent open. Valve shall be Class [_____], flanged, iron or semi-steel body with stainless steel internals. Valve shall have equal percentage flow characteristics with a full size port. Provide an air lock mounted on valve diaphragm and piped to hold valve in last position on air failure.

2.9.11.8 Sample Cooler

Water cooled shell and tube type with valves and accessories required to safely withdraw a water sample from the boiler drum. Provide drain under sampling valve terminating with a 3/4 inch splash proof funnel, 9 inches below outlet of valve.

2.9.11.9 Heat Exchanger

Provide an ASME code stamped continuous blowoff heat exchanger designed and constructed in accordance with ASME BPVC SEC VIII D1 to transfer heat from the continuous blowoff water leaving the continuous blowoff flash tank to the treated makeup water entering the feedwater heater. Heat exchanger shall be a bare tube, helical coiled bundle, installed in a one piece casing with removable front plate. Bundle shall be removable. Tube diameter shall be not less than 3/4 inch. Tubes shall be ASTM B111/B111M copper alloy with cast iron shell. Design tube side for not less than [_____] psig pressure at [_____] degrees F. Design shell side for not less than [_____] psig pressure at [_____] degrees F.

2.10 PIPING

Piping work shall include the provision of piping systems, including valving and specialty items, for the steam plant and related external auxiliary equipment. Piping materials, design, and fabrication shall be in accordance with ASME B31.1 except as modified below or indicated otherwise. The requirements of ASME B31.1 apply to the building steam heating and steam distribution piping designed for 15 psig or lower and hot water heating systems 30 psig or lower. Provide piping materials suitable for the maximum pressure at the maximum temperature at which the equipment must operate. Compute expansion of pipe with operating temperatures above zero degrees F with zero degrees F in lieu of 70 degrees F specified in

ASME B31.1.

2.10.1 Piping Materials

a. Steam Pipe, Boiler Feedwater Pipe, Relief Pipe and Steam Tracer: Pipe Black, ASTM A53/A53M or ASTM A106/A106M seamless steel pipe, Grade A or B. Wall thickness not less than Schedule 40. Steam tracer pipe, with steam up to 15 psig, may be ASTM B88, Type K copper tubing.

b. Condensate Pipe and Boiler Blowdown Pipe: Black, welded or seamless ASTM A53/A53M or ASTM A106/A106M, steel pipe, Grade A or B. Wall thickness not less than extra strong (XS or Schedule 80).

c. Chemical Feed Pipe: ASTM A312/A312M austenitic stainless steel.

d. Fuel Oil Pipe: ASTM A53/A53M or ASTM A106/A106M, seamless black steel pipe, Grade A or B.

e. Treated Water, Hot Water Heating, High Temperature Water, Drains (Other Than Sanitary), and Overflow Pipe: ASTM A53/A53M, black, welded or seamless steel up to a maximum pressure of 250 psig or ASTM A106/A106M, Grade A or B.

f. Gas Pipe and Compressed Air Pipe: ASTM A53/A53M welded or seamless pipe up to a maximum pressure of 250 psig or ASTM A106/A106M, Grade A or B.

g. Instrument Air Pipe: ASTM B88 hard copper tubing, Type K or L; except in a corrosive atmosphere or outside…