H17.REV

CONDENSER WATER SYSTEM (Field Assembled Cooling Tower)

NOTE: FINAL COPY: MAY, 1987.

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 with 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

1.	Piping.

2.	Cooling tower.

3.	Pumps.

4.	Cooling tower winterization.

5.	Make-up water system.

6.	Make-up water pumps.

7.	Pumped make-up water back pressure regulator.

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 OF THIS SECTION

B.	Related work in the following Sections:

1.	PIPING.

2.	INSULATION.

3.	AUTOMATIC CONTROL SYSTEM.

4.	MOTORS.

5.	VIBRATION ISOLATION.

6.	WATER TREATMENT.

7.	MOTOR CONTROLLERS

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

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

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

5)	SUBMITTALS

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

1.	Cooling tower including:

a.	Assembly drawings.

b.	Foundation, framing, vibration isolation, construction, materials, accessories and structural support

c.	Fan motor and gear box.

d.	Tower capacity curves with varying wet bulb temperatures, water pressures and gpm

e.	All interconnecting piping and wiring diagrams.

f.	Noise guarantee and noise level data.

g.	Method of performance test.

2.	Pumps, motors and certified pump curves.

3.	Condenser water make-up orifice sizing data.

4.	Condenser water make-up storage tank.

5.	Make-up level control and related wiring diagrams.

6.	Make-up water back pressure regulator.

7.	Motorized valve operator and related wiring diagrams.

8.	Electrode water level controls and related wiring diagrams

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

A.	Cooling Towers (Field Fabricated): Marley Co., Baltimore Air Coil-Pritchard

NOTE: COORDINATE LIST WITH CHILLED WATER PUMP MANUFACTURERS.

B.	Pumps:

NOTE: FOR OVER 50 HP OR FOR QUALITY PROJECTS, USE ANY OF FIRST SIX NAMES LISTED

1.	Allis-Chalmers Mfg. Co., Bell and Gossett, Ingersoll-Rand Co., Peerless Pump Co., Worthington Corp., Fairbanks Morse Co. and KSB Pump Co

NOTE: FOR UNDER 50 HP OR FOR SPECULATIVE TYPE PROJECTS, INCLUDE THE FOLLOWING NAMES

2.	Aurora Pump Co., Pacific Pump Co., Taco and Thrush.

C.	Electrode water level controls: B/W Controller Co. and McDonnell & Miller Div., ITT Fluid Handling Div

2)	PIPING

A.	Refer to Section PIPING for supply and return, fill and make-up water, drain and overflow, equalizing and winterization

B.	Provide screwed galvanized cast iron fittings for drain and overflow

C.	Valves, fittings, flanges, joints and accessories:

NOTE: FOR SYSTEM DESIGN PRESSURES UNDER 100 PSIG.

1.	Provide minimum 125 lb wsp or 200 lb wog except cast iron 150 lb wog and welded fittings, as specified under Section "PIPING"

D.	System design pressures.

NOTE: FOR SYSTEM DESIGN PRESSURES TO 175 PSIG.

1.	From ----- floor to ----- floor: 200 lb wsp or 200 lb wog

NOTE: FOR SYSTEM DESIGN PRESSURE TO 250 PSIG.

2.	From ----- floor to ----- floor: 250 lb wsp or 300 lb wog

NOTE: FOR SYSTEM DESIGN PRESSURES ABOVE 250 PSIG.

3.	----- floor and below: 300 lb ANSI or 720 lb wog.

E.	Provide manual air vent valves where necessary.

NOTE: WHERE CONDENSER WATER MAKE-UP IS PUMPED AND ROOF MAKE-UP TANK IS NOT USED, USE FOLLOWING

F.	Pumped condenser water make-up piping shall conform to requirements of condenser water piping

3)	AUTOMATIC AIR VENT VALVES

AUTO

A.	Automatic float operated: locate where indicated or required with accessories including inlet gate valve and pipe outlet to nearest floor drain or service sink

B.	Provide similar to Armstrong No. 21 or No. 71 AR, for 150 psig or 250 psig respectively

AUTO

NOTE: IF ALL WOOD OR WOOD FILLED TOWER IS USED, CHECK WHETHER A SPRINKLER SYSTEM IS REQUIRED WITHIN TOWER. WOOD COOLING TOWERS NOT PERMITTED IN NYC

4)	COOLING TOWER

A.	Cooling tower type, as follows:

TYPE

1.	Induced draft counterflow.

2.	Induced draft cross-flow.

TYPE

B.	Size and capacity shall be suitable for operating and space conditions as indicated

C.	Structural supports:

STEEL

1.	Dunnage steel and miscellaneous supports as required by tower manufacturer

2.	Dunnage steel and miscellaneous supports as required under General Construction Work

STEEL

3.	Adequate general building framework to support cooling tower in accordance with applicable local ordinances and all authorities having jurisdiction

NOTE: THE WIND LOAD OF 30 LBS PER SQ. FT. IS STANDARD. ENGINEER SHALL CONSULT WITH ARCHITECT AND STRUCTURAL ENGINEER FOR ADDITIONAL REQUIREMENTS DUE TO LOCATION

D.	Construct in accordance with authorities having jurisdiction and design for a wind load of 30 lb per sq. ft

E.	Fans: Multibladed type capable of handling saturated air at high velocity

NOTE: FOR INSTALLATIONS WITH CRITICAL NOISE CRITERIA, INCLUDING HOSPITALS, BUILDINGS WITH LOW NC LEVELS SUCH AS THEATERS. CHECK WITH MANUFACTURER

1.	Fan and motor suitable to produce design conditions if sound attenuator with 0.25 inch wg resistance is added

NOTE: FOR NYC PROJECTS BLADES MUST BE NON-COMBUSTIBLE.

2.	Adjustable pitch fan blades:

STEEL

a.	Fiberglass reinforced epoxy.

b.	Cast aluminum.

c.	304 stainless steel.

STEEL

NOTE: FOR TIP SPEED ABOVE 12,000 FPM CHECK WITH CHIEF MECHANICAL ENGINEER

d.	Maximum tip speed shall be 12,000 fpm. Critical speed shall be at least 25 percent higher than design speed. Hubs shall be cast iron or galvanized steel

3.	Gear speed reducer dynamically balanced shall be rated in accordance with AGMA with service factor of two (2) times the motor nameplate horsepower. Dynamically balanced drive shaft-coupling assembly, with built in oil filter and oil gauge accessible from outside of the fan stack, stainless steel or treated lead-carbon steel alloy shaft, nonlubricated flexible couplings, bearings sized and lubricated to withstand additional thrust due to unbalanced flow conditions inside the fan stack and an extension pipe with oil sight glass and extended to outside of fan stack to permit filling, sampling and breathing of oil

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

4.	Provide totally enclosed fan cooled type motors, with stainless steel shaft and built-in space heater energized when motor is inoperative. Motors shall be single winding two (2) speed motor

NOTE: COORDINATE VIBRATION ISOLATION WITH COOLING TOWER MANUFACTURER. NOT RECOMMENDED BY BAC & MARLEY

F.	Vibration eliminators: provide integral structural steel frame for mounting fan, gear reducer and motor. Frame shall be isolated from tower frame by means of steel springs. Steel springs shall have an outside diameter selected for stability with ratio of horizontal to vertical stiffness equal to minimum 1.2 times ratio of maximum static deflection to working height. Allowance shall be made for deflection due to fan thrust including static load. Isolation efficiency shall be minimum 70 percent. Springs shall be cadmium plated and coated with epoxy paint. Fan operating speeds shall be considered primary disturbing frequency. Provide mounting with a built-in leveling device. Provide resilient snubber for limiting vertical rise on fan shutdown and consisting of two (2) layers of 3/8 inch corrugated neoprene pad with galvanized steel plate between neoprene pads in series with spring. Anchor bolts shall be isolated from tower by neoprene bushings and resilient washers. Vibration mountings except springs shall be hot dipped galvanized and similar to Vibration Mountings and Controls, Inc. Spring-Flex Type SEPP

G.	Provide a control unit for each cooling tower cell with vibration switch in accordance with the following

1.	Control unit shall be suitable for operation at 120V AC, 1 phase, 60 Hz and provided with start time delay, continuously adjustable, 5 to 240 seconds. Setting to be field approved at test. Provide monitoring time delay, continuously adjustable, 2 to 3 seconds. Setting to be field approved at test. Provide alarm indicating light in separate cast iron box attached and located above the control unit. Provide built in provisions for remote alarm and/or indicating light. Control unit shall be in a stainless steel cabinet. Unit shall shut down fan when vibration time exceeds starting and monitoring delays. Control unit shall be similar to Robertshaw Model No. 561-W-3 with weatherproof enclosure

2.	Field Adjustment and Tests: Each vibration switch and control unit shall be adjusted to its respective fan during running operation, including starting and monitoring delays. All adjustments are to be performed by the manufacturer's engineer. Each cooling tower fan shall be run through a complete operational sequence including simulated vibration in order to verify the performance of the automatic fan shut down controls. Fan will then be restarted and run for a sufficient time to satisfy proper operation and reset of all controls

3.	All adjustments and tests shall be performed in the presence of the Owner or the Owner's representative

NOTE: FOR TOWERS WHERE NOISE IS NOT CRITICAL OR WHERE OWNER IS WILLING TO ASSUME RISK, USE ONE OF FOLLOWING OPTIONS. COORDINATE WORK WITH SOUND CONSULTANT

NOISE

H.	Noise criteria:

1.	Tower and fan acoustical performance shall not exceed ----- dba at a distance of ----- from any cooling tower surface

I.	Noise criteria: tower and fan shall operate per drawings and specifications and shall not produce noise levels in excess of the following noted sound pressure levels

1.	Induced draft propeller fans. = = Frequency 10 20 50 100 hp = Band (Hz) = 20-75 102 105 109 112 = 75-150 101 104 108 111 = 150-300 99 102 106 109 = 300-600 96 99 103 106 = 600-1200 92 95 99 102 = 1200-2400 89 92 96 99 = 2400-4800 87 90 94 97 = 4800-10000 83 86 90 93 =

2.	For tower fan hp greater than 100 hp, add to 100 hp tabulation: 10 log (hp/100)

NOTE: USE WHERE NOISE EMISSION IS CRITICAL. INDICATE CRITICAL POINT WHERE READINGS ARE TO BE TAKEN. SELECT APPLICABLE NC CURVE AND ADD TO VALUES FOR VARIOUS FREQUENCY BANDS. NOTE THAT NOISE EMISSION CAN BE REDUCED BY APPROXIMATELY 13 DB BY HALF SPEED OPERATION OF FAN. SPECIFY HALF SPEED OPERATION AT NIGHT WHERE APPLICABLE AND AVOID FAN CYCLING IF POSSIBLE

J.	Noise criteria: tower and fan shall not produce noise in excess of the following noted sound power levels

1.	Airborne noise in decibels relative to a standard reference pressure of 0.0002 microbar, measured in each octave band of 20-10,000 Hz frequency spectrum

2.	Readings taken where noted on Dwg. No.----- and 1 ft outside designated window

3.	Maximum noise from cooling tower shall be based on the higher of following

a.	Permissible octave band sound pressure levels noted in following table

b.	Average minimum background noise levels measured at same location during normal day

c.	Average minimum background noise levels measured at same location during normal night

d.	Exceeding limiting noise values acceptable only in two (2) frequency bands and by maximum 2 db

e.	Limiting Noise Levels: = = Frequency Sound Pressure re: = Band (Hz) 0.0002 micro bar = 20 - 75 ------------------ = 75 - 150 ------------------ = 150 - 300 ------------------ = 300 - 600 ------------------ = 600 - 1200 ------------------ = 1200 - 2400 ------------------ = 2400 - 4800 ------------------ = 4800 - 10000 ------------------ =

4.	When requested of and approved by Architect, in writing, manufacturer may obtain satisfactory noise levels by oversizing equipment or providing sound attenuation

NOISE

NOTE: CONCRETE BASIN, WHEN FURNISHED BY GENERAL CONTRACTOR. COORDINATE WITH ARCHITECT

NOTE: FOR METAL BASIN. * OPTION 3 GAUGE * NOT RECOMMENDED BY MARLEY

BASIN

K.	Collecting basins, provide as follows:

GAUGE

1.	Stainless steel shall be NO. 10 USSG. Basin shall be shop fabricated and welded in the field and anchored to supporting structure

2.	Hot dipped galvanized steel. Basin shall be shop fabricated and bolted in field and anchored to supporting structure

3.	Hot dipped galvanized steel with fuse bonded thermal setting polyner. Basin shall be shop fabricated and bolted in field and anchored to supporting structure

GAUGE

NOTE: FOR STEEL BASINS CHECK WHETHER WINTERIZING IS NEEDED FOR BASIN AND IF SO, ON HOW MANY CELLS

4.	Provide tower with provision for winterization for number of cells as noted. Basin volume to normal water level shall be based on a minimum of two (2) hours retention and sufficient to accept the flow back on plant shutdown

NOTE: FOR WOOD BASIN. FOR WOOD TOWER.

L.	Collecting basins, provide as follows:

REDWOOD

1.	Floors shall be 1 1/8 inch thick Douglas Fir Plywood waterproof, pressure treated tongue and groove laminated wood panels nailed to joints on closed centers with bronze nails. Sides shall be 1 1/8 inch thick Douglas fir bolted to floor with hardware as specified.

2.	Floors shall be 1 1/2 inch thick Redwood waterproof, pressure treated tongue and groove plywood panels nailed to joints on closed centers with bronze or stainless steel nails. Sides shall be 1 1/2 inch thick redwood bolted to floor with hardware as specified

REDWOOD

3.	All joints shall be sealed with mastic to prevent leakage

NOTE: FOR WOOD BASINS CHECK WHETHER WINTERIZING IS NEEDED FOR BASIN AND IF SO, ON HOW MANY CELLS

4.	Provide tower with provision for winterization for number of cells as noted

BASIN

NOTE: FOR STEEL BASIN DEPRESSED STEEL PLATE OUTLET SUMP.

M.	Basin accessories: Depressed steel plate suction outlet sump hot dipped galvanized after fabrication, with galvanized steel anticavitation plate, removable galvanized steel debris screen, combination overflow and cleanout drain connection and outlet connection drilled for standard 125 lb flange

NOTE: FOR WINTERIZED OPERATION.

1.	Thermostat and connections for winterizing.

NOTE: FOR WOOD TOWER REFER TO PARAGRAPHS K THROUGH T. REFER TO PARAGRAPHS U THROUGH AA FOR STEEL TOWER

N.	Fan deck, as follows:

DECK

1.	Minimum 1 1/8 inch exterior grade Douglas Fir Plywood.

2.	Tongue and groove construction, using Redwood 1 1/2 inch minimum nominal thickness

NOTE: VERIFY REQUIREMENT FOR SNOW LOAD AND LIVE LOAD IF SILENCER IS CONSIDERED

DECK

3.	Tower decking shall be designed for minimum live load of not less than 60 lb. per sq. ft. and a snow load of not less than 30 lb. per sq. ft

4.	Wood roof framing shall be designed for additional loads of fan, fan motor, gear reducer, fan casing and other loads during erection or normal operation

5.	Fan stack: Glass reinforced polyester stack. Interior shall be smooth aerodynamic surface. Removable wire screen guard shall be hot dipped galvanized after fabrication

O.	Wood frame:

1.	Lumber: provide the following for all wood segments of tower

WOOD

a.	Clear California Redwood: CTI Code Tower Standard Specifications, CTI Bulletin STD-103, Part 1: grades of Redwood Lumber

b.	Clear Douglas Fir: CTI Bulletin STD-114, Part 1: grades of Douglas Fir Lumber

WOOD

c.	Wood shall be thoroughly pretreated under pressure with waterborne preserative acid copper chromate that forms an insoluble, toxic precipitate within wood fibers, applied in accordance with CTI Bulletin WMS-112 current issue. Wood with moisture content greater than 20 percent shall be dried before treatment

d.	Lumber shall be in accordance with the Forest Products Laboratory, the U.S. Department of Agriculture, the Wood Handbook Manual, and the requirements of all authorities having jurisdiction

e.	Frame stress values shall be in accordance with

STRESS

(1)	CTI Douglas Fir Lumber Specifications, CTI Bulletin STD-114, Part II: Design Data

(2)	CTI Redwood Lumber Specifications, CTI Bulletin STD-103, Part II: Frame Design Data

STRESS

2.	Framework shall be in accordance with AITC - Timber Construction Manual; bolted, reinforced, and interconnected so that stresses are transmitted directly to the tower foundation

P.	Hardware, provide as follows:

BOLTS

1.	Bolts, nuts and washers shall be hot dipped galvanized steel after fabrication

2.	Bolts, nuts and washers shall be silicon bronze.

3.	Bolts, nuts and washers shall be stainless steel.

BOLTS

4.	Structural timber connectors: provide either bronze, stainless steel, fiberglass, or structural ceramic materials

5.	Baseplates, special washers and castings: provide either cast iron, hot dipped galvanized steel after fabrication or stailess steel

6.	Nails: provide either copper, bronze or stainless steel

7.	Structural joints shall be through bolted. Nails or lag screws for structural joints will not be permitted

8.	No direct contact of uncoated metal fittings with structural wood and no direct contact of unlike metal will be permitted

Q.	Casing:

1.	Type: 8 oz per sq. ft fire retardant fiberglass construction which shall not carry any structural load

2.	Partitions: provide partitions full height of tower, 5/8 inch exterior grade plywood, single sheathed construction, and water and air tight to permit individual cell operation

NOTE: FOR WOOD COOLING DECKS, OTHER FILL AND ELIMINATOR MATERIAL ARE AVAILABLE, SUCH AS POLYVYNIL CHLORIDE AND POLYPROPYLENE. PVC SHOULD NOT BE USED FOR DIRTY WATER, PAPER PULP, AND TEMPERATURES HIGHER THAN 120 DEG F. CHECK WITH CHIEF MECHANICAL ENGINEER IF THEIR USE IS DESIRED

R.	Cooling decks as follows:

ILL

1.	For crossflow tower - PVC film fill shall be a minimum of 15 mil. thick and shall be supported by stainless steel tubes inserted through reinforced sockets molded into the fill sheets and assure stability of assembly in a hanging mode to preserve proper alignment

2.	For counterflow tower - PVC film shall be a minimum of 15 mil thick and shall be bottom supported. Individual fill sheets shall be the full height of the fill requiring no stacking of smaller packs to achieve an appropiate fill height. Stacked fill will not be accepted

ILL

3.	Splash bars shall be arranged so that all water drops have their fall broken by each deck and fitted so as to permit easy removal of individual bars with ample clearance for handling. There shall be positive and permanent positioning support of bars; support shall permit expansion and contraction without cracking, warping or sagging. Nailing will not be permitted. Splash bars shall be Redwood or Douglas Fir as specified under Wood Frame

S.	Drift eliminators:

RIFT

1.	Polyvinyl chloride (PVC) Cellular 3 pass eliminators to limit drift loss to less than 0.05 of 1%

2.	For crossflow flow towers: PVC eliminator integral with fill sheet is acceptable

RIFT

NOTE: FOR WOOD DRIFT ELIMINATORS.

a.	Wood slats eliminators shall be fitted into grooves to permit removal of individual slats; nailing will not be permitted. Slats shall overlap each other to form pockets for efficient trapping of entrained moisture. Decks shall be designed for minimum live load of 25 lb. per sq. ft. Provide wind screens and inlet louvers, as required, to reduce drift during high winds

NOTE: FOR SPRAY TYPE WATER DISTRIBUTION.

DISTR

T.	Water distribution shall be designed for reduced inlet water flow at part load and with cells out of service with water by-pass to basin for winter operation. Distribution system shall be designed to withstand the pressure exerted on it during pump shutoff. Distribution system for each cell shall be isolated by tight shutting, non-ferrous isolation valves. Header system with branches, spray arm and nozzles shall be self-draining and arms shall be fitted with minimum 1 inch nozzle. Provide non-clogging nozzles of cast bronze or polyethylene type, set to spray down. Provide vents to permit filling with water with the distribution valve closed

NOTE: FOR GRAVITY TYPE WATER DISTRIBUTION.

U.	Water distribution system for each cell shall be open basin or trough type, with redwood or laminated fir panels over each bank of fill. There shall be gravity flow through nozzles of high impact polypropylene plastic

PIPE

1.	Pipe shall be galvanized steel.

2.	Pipe shall be fiberglass.

PIPE

DISTR

V.	Air inlet louvers:

OUVE

1.	Louvers 21 inches wide shall be constructed from corrugated sheets of 8 oz./sq. ft. fire-retardant fiberglass reinforced polyester (FRP) supported on maximum 3 ft. centers and minimize water splash-out. Connect louvers using stainless steel fasteners

2.	For cross from towers: PVC Louvers integral with full sheet shall be acceptable

OUVE

W.	Access: for fan deck shall be as follows:

LAD

1.	Provide two (2) wood stairways with hand rail and necessary landings and provide braced wood hand railings around fan deck

2.	Provide two (2) aluminum ladders with safety cages and braced wood hand railings around fan deck

LAD

NOTE: FOR CROSS FLOW TOWER.

ACCESS

3.	Access from grade.

NOTE: FOR COUNTER FLOW TOWER.

4.	Access from roof level.

ACCESS

5.	Gear and fan: access port in fan cylinder and removable screen guard

6.	Water distribution and eliminator area: attached ladder for each cell from hinged access door in fan deck

7.	Basins: hinged watertight access doors the same material as casing in un-louvered side wall, through louvered face by removal of louvers

8.	Stairways, walkways and platforms shall be in accordance with OSHA Standards and governing state and local codes

NOTE: FOR CROSSFLOW TOWERS.

9.	Eliminator section: hinged access door in un-louvered side wall, access ladder and inside platform for full width of the tower, for each cell

X.	Fire protection shall be in accordance with NFPA and local ordinances during erection, operation and maintenance shall be with means to flush out the fire water and adequate space for fire protection equipment.

NOTE: FOR STEEL TOWER EDIT PARAGRAPHS U THROUGH AA. REFER TO PARAGRAPHS K THROUGH T FOR WOOD TOWER

Y.	Fan deck, provide as follows:

1.	Steel shall be No. 10 USSG.

NOTE: VERIFY REQUIREMENT FOR SNOW AND LIVE LOAD IF SILENCER IS CONSIDERED

2.	Steel checker plates: provide hot dipped galvanized steel, bolted to structural steel roof framing and designed for live load of not less than 40 lb. per sq. ft. and a snow load of not less than 30 lb. per sq. ft

3.	Steel roof framing shall be designed for additional loads of fan, fan motor, gear reducer, fan casing and other loads during erection or normal operation

NOTE: COORDINATE STACK. STEEL FAN STACK REQUIRED ON PROJECT IN NYC

STACK

4.	Fan stack: No. 14 USSG steel stack braced against wind forces by rolled angle members, with removable wire screen guard. Casing and screen guard shall be hot dipped galvanized after fabrication

5.	Fan stack: glass reinforced polyester stack interior shall be smooth aerodynamic surface. Removable wire screen guard shall be hot dipped galvanized after fabrication

NOTE: ALL STRUCTURAL LOADING SHOULD BE FROM STRUCTURAL FRAME WORK

STACK

Z.	Steel frame: minimum 1/4 inch thick steel members, hot dipped galvanized after fabrication and anchored and braced. Framework shall be bolted, reinforced and interconnected so that stresses are transmitted directly to tower foundation

AA.	Hardware, provide as follows:

HARD

1.	Bolts nuts and washers shall be Cadmium plated.

2.	Bolts nuts and washers shall be hot dipped galvanized after fabrication

3.	Bolts nuts and washers shall be stainless steel.

HARD

4.	No direct contact of unlike metals will be permitted.

NOTE: FOR STEEL TOWERS WITH TRANSITE CASING.

AB.	Casing, provide as follows:

1.	Type: Hot dipped 16 gauge galvanized steel.

a.	Watertight by means of colorless calking compound

b.	At manufacturer's option, standard non-asbestos cement board with interior surface coated with bitumastic mill undercoat may be used

c.	Casing material shall be guaranteed not to stain or absorb water. If within five (5) years, after acceptance, wetting of exterior face or staining of casing material occurs, cooling tower manufacturer shall coat or recoat entire interior of casings with bitumastic mill undercoat, as approved, at manufacturer's sole expense

2.	Casing fastenings to frame, constructed as follows: Bolts, nuts, washers and clips shall be stainless steel; galvanized bolts and clips will not be permitted. Washers shall be furnished with neoprene sealing gaskets to prevent leakage around bolts. At joints, casing shall be overlapped or covered with batten strip. Joints shall be sealed watertight and airtight

3.	Partitions between adjacent cells:

a.	Extend partitions from water distribution deck to the level far enough into the basin to permit a fluctuation of one foot below the normal water through level without the cross flow of air

b.	Partitions shall be constructed of galvanized sheet steel as specified for casing and constructed the full height of tower

SURF

c.	Surface shall be corrugated.

d.	Surface shall be flat.

SURF

e.	Partitions shall be watertight and airtight with doors for access to adjacent cells

4.	Sealing compounds shall be similar to Vulcatex or Kunls

NOTE: FOR SPRAY TYPE WATER DISTRIBUTION.

DISTRI

AC.	Water distribution shall be designed for reduced inlet water flow at part load and with cells out of service and with water by-pass to basin for winter operation. Distribution system shall be designed to withstand the system pressure for each cell and shall be isolated by tight shutting, non-ferrous isolation valves. Header system with branches, spray arm and nozzles shall be self-draining and arms shall be fitted with minimum 1 inch nozzle. Non-clogging nozzles of cast brtonze or polyethylene type shall be set to spray down. Pipe shall be galvanized steel. Provide vents to permit filling with water with the distribution valve closed

NOTE: FOR GRAVITY TYPE WATER DISTRIBUTION.

AD.	Water distribution: distribution system for each cell shall be open basin or trough type, with redwood or laminated fir panels over each bank of fill. There shall be gravity flow through nozzles of bronze, glazed porcelain, or high impact polypropylene plastic

PIPE

1.	Pipe shall be galvanized steel.

2.	Pipe shall be fiberglass.

NOTE: FOR STEEL COOLING TOWERS. OTHER MATERIALS ARE AVAILABLE FOR LOUVERS COORDINATE WITH MANUFACTURER

PIPE

DISTRI

LOUVER

AE.	Air inlet louvers: 1/4 inch thick non-asbestos cement board louvers supported on 3 ft. centers and slip fitted into grooves for easy individual removal

AF.	Air inlet louvers: minimum 8 oz soft fire retardent fiberglass polyester reinforced louvers supported on left centers and fitted for easy individual removal

LOUVER

AG.	Access for fan deck shall be as follows.

NOTE: FOR STEEL TOWER.

LAD

1.	Two (2) galvanized steel stairways with hand rail and necessary landings and braced galvanized steel hand railings around fan deck

NOTE: FOR STEEL TOWER.

2.	Two (2) galvanized steel ladders with safety cages and braced galvanized steel hand railings around fan deck

NOTE: FOR CROSS FLOW TOWER.

LAD

ACCESS

3.	Access from grade.

NOTE: FOR COUNTER FLOW TOWER.

4.	Access from roof level.

ACCESS

5.	Gear and fan: provide hinged door in fan deck and hinged door in screen guard

6.	Water distribution area: provide attached ladder for each cell from hinged access door in fan deck

7.	Basins: provide hinged watertight access doors the same material as casing in un-louvered side wall, through louvered face by removal of louvers

8.	Eliminator section: provide hinged access door in un-louvered side wall, access ladder and inside platform for full width of the tower, for each cell

9.	Stairways, walkways and platforms shall be in accordance with OSHA Standards and governing state and local codes

NOTE: COORDINATE IF CONDENSER WATER PUMPS ARE THE SAME AS CHILLED WATER PUMPS AND COORDINATE WITH ELECTRICAL DEPARTMENT

NOTE: PACKED STUFFING BOX SEALS ARE PREFERRED.

5)	CONDENSER WATER CIRCULATING PUMPS

CON

A.	As specified in Section CHILLED WATER SYSTEM, except seals shall be packed stuffing boxes

NOTE: IF CONDENSER WATER PUMPS ARE NOT THE SAME AS PUMPS SPECIFIED ELSEWHERE

B.	Centrifugal, single stage, 2 stage where noted, with bronze, enclosed, non-overloading statically, dynamically and hydraulically balanced impeller suitable for conditions of service. Casing shall be high grade cast iron

NOTE: OMIT ON CLOSE-COUPLED PUMPS.

1.	Motor coupling shall be flexible.

2.	Pump and motor assembly shall be installed on cast iron or rolled steel baseplate with raised lip rim and drain tappings

3.	Shaft seals:

NOTE: USE PACKED STUFFING BOXES ONLY TO 100 PSIG SUCTION PRESSURE. PACKED PUMPS GENERALLY USED BELOW 50 PSIG SUCTION PRESSURE. WHERE APPLICATION REQUIRES USE OF PACKED PUMPS 50 tO 100 PSIG SUCTION PRESSURE, REVIEW WITH DEPARTMENT CHIEF ENGINEER

NOTE: UP TO 50 PSIG SUCTION PRESSURE.

SEAL

a.	Packed stuffing boxes consisting of graphitized, non-asbestos plastic packing rings, similar to John Crane Superseal No. 1

NOTE: SUCTION PRESSURE BETWEEN 50 AND 100 PSIG.

b.	Packed stuffing boxes consisting of combination packing rings of graphitized, non-asbestos material, and babbitt foil arranged in accordance with manufacturer's recommendations, similar to John Crane 101M, split lantern rings, water seal piping, extra heavy bronze, split and counterbored and packing glands and brass studs

NOTE: USE MECHANICAL SEAL ONLY WHEN SUCTION PRESSURE EXCEEDS 100 PSIG

c.	Mechanical seals consisting of single, inside mounted, end face rubber bellows type, stainless steel springs, brass or stainless steel seal heads, babbitt filled carbon rotating washer, tungsten carbide stationary seat and water flushed glands designed to provide flush across face of mechanical seal

(1)	For pressures less than, 150 psig, similar to John Crane Type 1

(2)	For pressures 150 psig, or greater, balanced construction, similar to John Crane Type 1B

SEAL

NOTE: MINIMUM OF 20 PSIG DIFFERENTIAL REQUIRED FOR EFFICIENT OPERATION OF ABRASIVE SEPARATOR

NOTE: FOR ECONOMY PROJECTS.

SEP

d.	Plastic abrasive separator, similar to John Crane Kynar

NOTE: FOR QUALITY PROJECTS.

e.	By-pass line from pump discharge to flush connection in gland with filter or cyclone seperator in line. Coordinate construction and type with water treatment as specified in Section WATER TREATMENT. Furnish spare set of seals for each pump

NOTE: USE FOR SUCTION PRESSURE UP TO 150 PSIG.

SEP

4.	Pump and motor capacities shall be minimum as scheduled and suitable for parallel operation. Motor shall operate over entire head capacity range of pump without exceeding horsepower rating

5.	Pump characteristics: pump curve shall rise continuously from maximum capacity to shutoff. Shutoff head shall be approximately 10 percent greater than design head. Operation shall be at or near peak efficiency. Pump shall be capable of operating at 25 percent beyond design capacity without exceeding breakoff point. For impeller diameter, provide maximum 90 percent difference between maximum and minimum of published impeller diameter

6.	Alignment: pump manufacturer shall align each pump at start-up with dial indicator of plus or minus 0.002 inch accuracy. Certify in writing that alignment work has been performed by manufacturer's personnel and that pumps are operating in accordance with design requirements

7.	Test and design pumps to withstand 1 1/2 times specified working pressure

CON

C.	Horizontal split case type, as follows:

1.	Double suction.

FLA

2.	Pump and flanges shall be 125 psig working pressure.

3.	Pump and flanges shall be 250 psig working pressure.

FLA

NOTE: FOR WORKING PRESSURES ABOVE 250 PSIG CHECK WITH PUMP MANUFACTURER AND REVIEW SPECIFICATION

4.	Shaft shall be 416 stainless steel.

5.	Shaft sleeves shall be renewable.

NOTE: FOR PACKED PUMPS.

SLEEVE

a.	Shaft sleeves shall be 17 percent chrome and stainless steel, heat treated and hardened or ceramic coated stainless steel of a minimum 600 Brinell hardness

NOTE: FOR MECHANICAL SEALS.

b.	Shaft sleeves shall be unhardened 416 stainless steel

SLEEVE

6.	Trim: shaft nut and stuffing box bushing shall be bronze

7.	Casing and impeller wearing rings: renewable, dissimilar bronze of hardness to protect against galling. Provide flanged suction and discharge connection

BEARINGS

8.	Bearings: ball, oil lubricated with oiler with rated life of 80,000 hours

9.	Bearings: ball, grease lubricated in moisture and dustproof housings with rated life of 80,000 hours and cartridge bearings which cannot be lubricated will not be acceptable

BEARINGS

10.	Bearing brackets: integrally cast with casing with flooding

11.	Bearing housings: bolted and dowelled to bearing brackets

12.	Flexible couplings: self-aligning, metal type, similar to Waldron, Thomas, Falk and Fast. Provide removable sheet metal coupling guard

NOTE: REVIEW TYPES WITH PUMP MANUFACTURER. TYPE LR OR LN IS GOOD TO 125 PSIG WORKING PRESSURE: TYPES LR OR LN, TO 250 PSIG AND TYPE UNB TO 600 PSIG AND IS 2 STAGE. INSERT TYPE

a.	Pumps, similar to Peerless Type A or AD (series 5100) or Worthington Type LR

NOTE: AVOID THIS TYPE PUMP FOR SUCH PROJECTS AS THEATERS, HOTELS, DORMITORIES, ETC. DUE TO INTEGRAL NOISE

D.	Vertical split case type, as follows:

NOTE: SMALLER SIZE PUMPS MAY HAVE THREADED SUCTION AND DISCHARGE CONNECTIONS. CHECK

PUMP

1.	Pump and flanges shall be 125 psig working pressure.

2.	Pump and flanges shall be 250 psig working pressure.

NOTE: FOR WORKING PRESSURE ABOVE 250 PSIG CHECK WITH PUMP MANUFACTURER AND REVIEW SPECIFIFCATIONS

PUMP

3.	Shaft shall be steel.

4.	Trim shall be bronze.

5.	Casing wearing rings shall be renewable bronze.

6.	Provide shaft sleeves renewable with:

NOTE: FOR PACKED PUMPS.

SLEEVE

a.	Hardened stainless steel, ceramic coated stainless steel or ceramic coated bronze. Hardness: minimum 500 Brinell

NOTE: FOR MECHANICAL SEALS.

b.	Unhardened 416 stainless steel.

SLEEVE

7.	Bearings: ball, oil lubricated with oiler or grease lubricated, suitable for in-service lubrication with rated life of 80,000 hours. Provide bearing brackets with overflow holes to prevent flooding

NOTE: OMIT FOR CLOSE-COUPLED PUMPS ON ECONOMY PROJECTS UP TO 125 PSIG WORKING PRESSURE

8.	Flexible couplings: self-aligning, metal type, similar to Waldron, Thomas, Falk and Fast and provide removable sheet metal coupling guard

NOTE: REVIEW TYPES WITH PUMP MANUFACTURER. TYPE D IS SUITABLE TO 250 PSIG AND TYPE HN TO 600 PSIG WORKING PRESSURE

9.	Pumps similar to Worthington Type D-1000.

NOTE: FOR CLOSE COUPLED PUMPS UP TO 125 PSIG WORKING PRESSURE ON ECONOMY PROJECTS

10.	Pumps similar to Peerless Series F.

6)	DRAIN CONNECTIONS

A.	Valved drain from cooling tower basin sump to drain as noted

NOTE: USE WHEN APPLICABLE.

B.	Drain from each cooling tower cell inlet and distribution by-pass connections

DRAIN

1.	Drain shall spill over nearest floor drain.

2.	Drain shall spill over nearest roof drain.

DRAIN

3.	Solenoid valve, suitable for 120 volt, 60 hertz, interlocked with respective motorized valve which closes when motorized inlet valve starts to open and opens when motorized inlet valve reaches closed position

OVERFLOW

C.	Overflow piping shall spill over nearest floor drain.

D.	Overflow piping shall spill over nearest roof drain.

OVERFLOW

E.	Provide drain piping from pump base to nearest floor drain.

NOTE: COORDINATE WITH COOLING TOWER DETAIL.

7)	COOLING TOWER WINTERIZATION SYSTEM

A.	Provide distribution by-pass piping to discharge into tower basin to prevent freeze-up in any part of basin or connecting piping. Provide necessary piping, insulation, controls, and wiring

TYPE

1.	System shall be electric type.

2.	System shall be steam type.

NOTE: CHECK WITH COOLING TOWER MANUFACTURER FOR LOCAL AREA CONDITIONS AND FILL IN TEMPERATURES

TYPE

3.	Provide capacity sufficient to maintain basin water temperature at ----- with ambient dry bulb temperature at -----

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

4.	Controls:

a.	Thermostats: provide 120 volt, single pole adjustable type in cast iron well with S.S. element

b.	Low water cutoff: provide probe type, stainless steel sheath with liquidproof outlet box

NOTE: FOR ELECTRIC SYSTEM. COORDINATE WITH THE ELECTRICAL DEPARTMENT

HEATER

B.	Immersion heaters: provide first quality resistance wire embedded in refractory and encased in stainless steel sheath. Provide replaceable type elements to operate on

VOLTS

1.	120 volt, 1 phase, 60 hertz.

2.	208 volt, 3 phase, 60 hertz.

3.	480 volt, 3 phase, 60 hertz.

NOTE: FOR STEAM SYSTEM SPECIFY COIL MATERIAL.

VOLTS

C.	Steam coils in basin, provide as follows:

1.	Pipe: -----.

2.	Inlet steam pressure: -----.

3.	Provide steam solenoid valve.

HEATER

NOTE: WHEN CONNECTING PIPING REQUIRES HEAT TRACING. COORDINATE WITH ELECTRICAL DEPARTMENT

D.	The following piping will be heat traced by electric resistance cable provided under Electrical Work and insulated and jacketted under Section INSULATION

1.	-----.

8)	CONDENSER WATER SYSTEM MAKE-UP WATER STORAGE TANK

A.	Tank construction shall be welded steel with dished heads of a size, capacity and arrangement, as indicated

B.	Tank shall be complete with all necessary saddles and structural supports, tappings, connections and piping as indicated, a gasketed 12 inch x 18 inch manhole, and a protected gauge glass for full height of tank, with shutoff valves and drain cock

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

1.	External type combination pump start and stop level controller shall start either or both condenser water make-up pumps when water in tank falls below its low water level and stop pumps when water in tank rises above high water level. Ball float shall be within steel float chamber. Float ball shall slide on rod between 2 adjustable stops. Controller shall be suitable for 120 volt, 1 phase, 60 hertz and shall be in accordance with ASME Code for Unfired Pressure Vessels, similar to Magnetrol Motel TF-31

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

9)	CONDENSER WATER SYSTEM MAKE-UP PUMPS

NOTE: IF MAKE-UP PUMP HEAD IS HIGH, A TWO STAGE PUMP MAY BE REQUIRED

A.	Conform to requirements as specified by Condenser Water Circulating Pumps, except as specified below. Capacity and motor shall be as indicated in schedules

1.	Pump with silent check valve and globe valve at discharge and re-circulation orifice suitable to pass minimum flow of water as required to prevent overheating of pump under shutoff head operation

2.	NPSH shall be maximum 8 ft at design point. Select pumps so that pump characteristic curve rises continuously from design point to shutoff. Shutoff head shall be a minimum 5 percent greater than design head

10)	PUMPED MAKE-UP WATER BACK PRESSURE REGULATOR

A.	Locate in common discharge of condenser water system make-up pumps and the operation shall be as follows

1.	Valve and its controller shall maintain preset back pressure at inlet side of valve

2.	As pressure increases above set point, valve shall gradually modulate open to maintain constant pressure

3.	Pneumatic controller shall have indicator showing controlled pressure, stainless steel ball bearing type linkage, indicating gauges for supply and controlled air signals and provisions for adjustment of controlled pressure and throttling band

NOTE: INSERT WORKING PRESSURE.

B.	Controller shall be ductile iron with stainless steel trim, pneumatically operated, having a maximum pressure drop of 10 psig and rated for ----- psig wsp

1.	Diaphragm actuated, spring loaded.

2.	Double seated parabolic plug.

3.	Normally closed.

NOTE: INSERT MINIMUM GPM.

4.	Capacity: minimum -----.

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

11)	MOTORIZED VALVES

A.	Locate at inlet, basin outlet and spray by-pass. Mount valve operators at factory or at site under the manufacturer's supervision. Provide valve type as noted on drawings and motorized valve operator as noted in Section PIPING

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

12)	WATER LEVEL CONTROLS

NOTE: FOR TOWERS USED FOR SUMMER OPERATION ONLY.

LEVEL

A.	Float controlled valve: one (1) heavy duty type per basin, cast bronze with seamless copper ball

NOTE: FOR TOWERS INTENDED FOR YEAR-ROUND OPERATION, ALSO COORDINATE WITH ELECTRICAL DEPARTMENT

B.	For each basin: Electrode make-up water actuating units with high and low water level and alarm.

1.	Electrode units shall be ice free type with four (4) electrodes with stainless steel suspension and vinyl plastic suspension wire

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

a.	The 350 watt immersion heater shall be with built-in and prewired thermostat and suitable electric control relays for make-up water control

NOTE: FOR NON-PUMPED MAKEUP WATER.

UNITS

(1)	Units shall be set to open make-up water solenoid valve

NOTE: FOR PUMPED MAKEUP WATER.

(2)	Units shall be set to start make-up water pumps and open make-up water solenoid valve

UNITS

(3)	Units actuate when basin water drops below ----- of water in basin. Units stop make-up water when basin water level rises above ----- of water in basin

(4)	A suitable vented pipe cover around electrodes shall prevent water waves or surges from affecting electrodes. Make-up control and electrode and heater circuits shall operate on 120 volts, 1 phase, 60 Hertz. Provide suitable transformers, if required. Unit similar to B/W Controller Corp., Type E-1F

LEVEL

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Pitch condenser water return piping to drain to tower.

B.	Provide drain valves as required to completely drain all piping exposed to freezing conditions

C.	Provide pitot tube taps as required for tower testing.

D.	Provide transformers as necessary to power vibration switches

2)	COOLING TOWER TESTING AND BALANCING

A.	Balancing: Balance condenser water distribution to each side of each cell. Re-balance as required after acceptance of performance test. Mark final balance position of flow control valves on durable tags. Submit performance of satisfactory balancing to Owner and/or Engineer prior to acceptance

B.	Performance Test and Start-up: perform tower field performance test in accordance with Cooling Tower Institute Code Test Procedures. Tests shall be performed on site after tower is functional

1.	Tests shall be performed by an independent testing agency and Owner or witnessed Owner's representative

2.	Provide all necessary labor, materials, connections, supervisory personnel and properly calibrated test instruments

3.	Retain the services of an independent testing agency.

4.	Should tests fail to meet predicted performance, manufacturer shall make all necessary changes to overcome deficiency as approved, at no cost to the Owner. Tower shall then be re-tested as per above at no cost to the Owner

5.	The cooling tower manufacturer shall provide certification of completion of balancing, start-up, and field testing and tower ready for proper operation

6.	The manufacturer shall provide factory trained test engineers to conduct the performance tests, including pretest set up time, such as fan blade adjustments, fan balancing, balancing of distribution system, alignment, control adjustments and any other work which may be required