SECTION 15545

CHEMICAL (WATER) TREATMENT

PART 1 GENERAL

SECTION INCLUDES

Cleaning of piping systems.

Chemical feeder equipment.

Treatment for closed systems.

Treatment for open systems.

Treatment for steam systems.

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section 15510 - Hydronic Piping: Water coupon rack, by-pass (pot) feeder.

RELATED SECTIONS

Section 15952 - Controls and Instrumentation.

SUBMITTALS

Submit shop drawings under provisions of Section [01300.] [01340.]

Submit shop drawings indicating system schematics, equipment locations, and controls schematics.

Submit product data under provisions of Section [01300.] [01340.]

Submit product data indicating chemical treatment materials, chemicals, and equipment.

Submit manufacturer's installation instructions under provisions of Section [01300.] [01340.]

Submit manufacturer's field reports under provisions of Section [01400.] [01405.]

Submit reports indicating start-up of treatment systems is completed and operating properly.

Submit reports indicating analysis of system water after cleaning and after treatment.

OPERATION AND MAINTENANCE DATA

Submit operation and maintenance data under provisions of Section [01700.] [01730.]

Include data on chemical feed pumps, agitators, and other equipment including spare parts lists, procedures, and treatment programs.

Include step by step instructions on test procedures including target concentrations.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the products specified in this Section with minimum [three] [ten] [_____] years [documented] experience. Company shall have local representatives with water analysis laboratories and full time service personnel.

REGULATORY REQUIREMENTS

Conform to [applicable] [EPA] code for addition of non-potable chemicals to building mechanical systems, and for delivery to public sewage systems.

MAINTENANCE SERVICE

Furnish service and maintenance of treatment systems for one year from Date of Substantial Completion.

Provide [monthly] [__________] technical service visits to perform field inspections and make water analysis on site. Detail findings in writing on proper practices, chemical treating requirements, and corrective actions needed. Submit two copies of field service report after each visit.

Provide laboratory and technical assistance services for warranty period.

Include [two] [_____] hour training course for operating personnel, instructing them on installation, care, maintenance, testing, and operation of water treatment systems. Arrange course at startup of systems.

Provide on site inspections of equipment during scheduled or emergency shutdown to properly evaluate success of water treatment program, and make recommendations in writing based upon these inspections.

MAINTENANCE MATERIALS

Submit maintenance materials under provisions of Section [01700.] [01750.]

Provide sufficient chemicals for treatment and testing during warranty period.

PART 2 PRODUCTS

MANUFACTURERS

[___________________________________________.]

[___________________________________________.]

[___________________________________________.]

Substitutions: Under provisions of Section [01600.] [01630.]

MATERIALS

System Cleaner:

Liquid alkaline compound with emulsifying agents and detergents to remove grease and petroleum products[;][.] [sodium tripoly phosphate and sodium molybdate.]

Algaecide[;][.] [chlorine release agents such as sodium hypochlorite or calcium hypochlorite, or microbiocides such as quarternary ammonia compounds, tributyl tin oxide, methylene bis (thiocyanate), or isothiazolones.]

Closed System Treatment (Water):

Sequestering agent to reduce deposits and adjust pH[;][.] [polyphosphate.]

Corrosion inhibitors[;][.] [[liquid] boron-nitrite, sodium nitrite and borax, sodium totyltriazole, low molecular weight polymers, phosphonates, sodium molybdate, or sulphites.]

Conductivity enhancers[;][.] [phosphates or phosphonates.]

Steam System Treatment:

Sequestering agent to reduce hardness and prevent feedline congestion[;][.] [phosphate.]

Base to provide alkalinity[;][.] [hydroxide.]

Oxygen scavenger[;][.] [sodium sulphite or hydrazine.]

Carbon dioxide neutralizer[;][.] [volitile amines such as morpholine or cyclohexylamine.]

Filming amines[;][.] [octadecylamine.]

Condenser Water System Treatment (Cooling Towers):

Sequestering agent to inhibit scaling[;][.] [phosphonates, sodium polyphosphates, lignin derivatives, synthetic polymer polyelectrolytes, or organite phosphates.]

Acid to reduce alkalinity and pH[;][.] [sulphuric acid.]

Corrosion inhibitor[;][.] [zinc-phosphate, phosphonate-phosphate, phosphonate-molybdate and phosphonate-silicate, sodium tolyltriazole, or low molecular weight polymers.]

Algaecide[;][.] [chlorine release agents such as sodium hypochlorite or calcium hypochlorite, or microbiocides such as quaternary ammonia compounds, tributyl tin oxide, methylene bis (thiocyanate), or isothiazolones.]

Open System Treatment (Humidifiers, Air Washers, Evaporative Condensers, Small Cooling Towers):

Sequestering agent to inhibit scaling and corrosion inhibitor[;][.] [polyphosphate.]

Algaecide[;][.] [chlorine release agents such as sodium hypochlorite or calcium hypochlorite, or microbiocides such as quaternary ammonia compounds, tributyl tin oxide, methylene bis (thiocyanate), or isothiazolones.]

EQUIPMENT

By-pass (Pot) Feeder: [Two quart] [1.8 gal] [6.0 gal] [[_____]gal] ([1.9][6.8][22.7][_____]L) quick opening cap for working pressure of [175][_____]psig ([1200][_____]kPa).

Drip Feeder: Plastic reservoir with coil of capillary tubing with probe, weight, charging syringe, and clip.

Solution Metering Pump: Positive displacement, diaphragm pump with adjustable flow rate, thermoplastic construction, continuous-duty fully enclosed electric motor and drive, and [built-in] relief valve.

Solution Tanks: [30] [50] gallon ([114] [189] L) capacity, polyethylene, self-supporting, [one][5] gallon ([3.8] [19]L) graduated markings; molded fiberglass cover with recess for mounting pump, agitator, and liquid level switch.

Agitator: [Totally enclosed] [Explosion-proof] electric motor, [cast iron] [stainless steel] clamp and motor mount, [1/2][5/8] inch ([13][16] mm) diameter [coated] Type 316 stainless steel propeller.

Liquid Level Switch: Polypropylene housing with integrally mounted PVC air trap, receptacles for connection to metering pump, and low level alarm.

Conductivity Controller: Packaged monitor controller with solid state circuiting, five percent accuracy, linear dial adjustment, built-in calibration switch, on-off switch and light, control function light, output to control circuit[.] [and recorder.]

Water Meter: Displacement type cold water meter with sealed, tamper-proof magnetic drive, impulse contact register, single pole, double throw dry contact switch.

Solenoid Valves: Forged brass body globe pattern, normally open or closed as required, [general purpose] [explosion-proof and watertight] solenoid enclosure, and continuous duty coil.

Timers: Electronic timers, infinitely adjustable over full range, 150 second and five minute range, mounted together in cabinet with hands-off-automatic switches and status lights.

TEST EQUIPMENT

Provide white enamel test cabinet with local and fluorescent light, capable of accommodating 4 - 10 ml zeroing titrating burettes and associated reagents.

Provide the following test kits:

Alkalinity titration test kit.

Chloride titration test kit.

Sulphite titration test kit.

Total hardness titration test kit.

Low phosphate test kit.

Conductivity bridge, range 0 - 10,000 microhms.

Creosol red pH slide complete with reagent.

Portable electronic conductivity meter.

High nitrite test kit.

PART 3 EXECUTION

PREPARATION

Systems shall be operational, filled, started, and vented prior to cleaning. Use water meter to record capacity in each system.

Place terminal control valves in open position during cleaning.

CLEANING SEQUENCE

Add cleaner to closed systems at concentration [as recommended by manufacturer.] [of one pound per 100 gallons (1 kg per 1000 L) of water contained in the system.] [of one pound per 100 gallons (1 kg per 1000L) of water for hot systems and one pound per 50 gallons (1 kg per 500 L) of water for cold systems.] [For steam systems, fill boilers only with cleaner and water.]

Hot Water Heating Systems: Apply heat while circulating, slowly raising temperature to 160 degrees F (71 degrees C) and maintain for 12 hours minimum. Remove heat and circulate to 100 degrees F (37.8 degrees C) or less; drain systems as quickly as possible and refill with clean water. Circulate for 6 hours at design temperatures, then drain. Refill with clean water and repeat until system cleaner is removed.

Chilled Water Systems: Circulate for 48 hours, then drain systems as quickly as possible. Refill with clean water, circulate for 24 hours, then drain. Refill with clean

water and repeat until system cleaner is removed.

Steam Systems: Apply heat, slowly raising boiler temperature to 160 degrees F (71 degrees C) and maintain for 12 hours minimum. Cool, then drain as quickly as possible. Refill with clean water, drain, refill and check for sludge. Repeat until system is free of sludge. Apply heat to produce steam for piping system and maintain for 8 hours minimum. Bypass traps and waste condensate.

Use neutralizer agents on recommendation of system cleaner supplier and approval of Architect/Engineer.

Flush open systems with clean water for one hour minimum. Drain completely and refill.

Remove, clean, and replace strainer screens.

Inspect, remove sludge, and flush low points with clean water after cleaning process is completed. Include disassembly of components as required.

INSTALLATION

Install in accordance with manufacturer's instructions.

CLOSED SYSTEM TREATMENT

Provide one bypass feeder on each system. Install isolating and drain valves and necessary piping. Install around globe valve downstream of circulating pumps unless indicated otherwise.

Introduce closed system treatment through bypass feeder when required or indicated by test.

Provide 3/4 inch (19 mm) water coupon rack around circulating pumps with space for [4] [12] [_____] test specimens.

STEAM SYSTEM TREATMENT

Provide bypass feeder on feedwater line to each boiler.

Provide solution pumps to feed sequestering agent and base from solution tank into [boiler.] [feedwater line close to boiler.] [condensate tank.] Provide minimum of one pump per boiler if treatment materials can be mixed. Provide agitator as required.

Provide solution pump to feed oxygen scavenger from solution tank into [deaerator storage section.] [feedwater tank.] [feedwater line as far as possible from boiler.] Provide pumps required to treat feedwater. Provide agitator as required.

Provide solution pump to feed carbon dioxide neutralizer or filming amine from solution tank into [steam header.] [bolier.] [feedwater line close to boiler.] [condensate tank.] Provide minimum of one pump[.] [per boiler.] Provide agitator as required.

Activate solution pumps [when feedwater pumps are running.] [from meter on makeup water.]

Provide conductivity controller to sample boiler water and operate solenoid blowdown valve. Provide timer activated sampling with solenoid valve, balancing valve, and conductivity probe. Pipe to blowdown tank.

Provide 3/4 inch (19 mm) water coupon rack on each feedwater pump with space for [4] [12] [_____] test specimens.

Provide liquid level switch in each solution tank to de-activate solution pump and agitator, and [sound local alarm bell.] [signal mechanical alarm system; refer to Section 15952.]

OPEN SYSTEM TREATMENT [(HUMIDIFIERS)] [(AIR WASHERS)] [(EVAPORATIVE CONDENSERS)] [(SMALL COOLING TOWERS)]

Provide [two] [_____] glass mesh feeder bags per unit, suspended in sump, filled with sequestering agent.

Provide drip feeder to feed sequestering agent into sump. Solenoid valve on drip system shall be interlocked with [spray] [circulating] pump.

Provide 1/2 inch (13 mm) bleed-off complete with globe valve piped to drain. [Locate bleed-off above flood line.] [Provide solenoid valve wired to pump.]

Provide conductivity controller to sample sump water and operate bleed-off solenoid valve. Activate with pump. Pipe to drain.

CONDENSER WATER SYSTEMS (COOLING TOWERS)

Provide solution pumps to feed sequestering agent and corrosion inhibitor from solution tank into condenser water supply to tower. Provide agitator as required.

Provide conductivity controller to sample condenser water and operate [11][_____] inch ([275][_____] mm) solenoid bleed valve[.] [and solution pumps.] Provide 1/4 inch (6 mm) solenoid valve and piping to blowdown controller sampler wired to open when condensing water pump is operating.

Provide solution pump to feed diluted acid from solution tank into condenser water supply to tower.

Introduce algaecide to tower by [intermittent slug feed.] [continuous feed solution pump or solenoid valve on tank

(chlorine).]

Provide water meter in make-up water line to tower, to activate solution pumps for preset time when condenser water pumps are running.

Provide liquid level switch in each solution tank to de-activate solution pump and agitator, and [sound local alarm bell.] [signal mechanical alarm system; refer to Section 15952.]

Provide 3/4 inch (19 mm) water coupon rack around circulating pumps with space for [4] [12] [_____] test specimens.

****** [OR] ******

CONDENSER WATER SYSTEMS (COOLING TOWERS)

Provide automatic condenser water control systems for inhibitor feed, blowdown and biocide feeds. Inhibitor application shall be meter activated, blowdown shall be conductivity activated, and biocide shall be meter fed with blowdown locked out to ensure biocide retention time.

Control system shall incorporate solid state integrated circuits and digital LED displays, in NEMA-12 steel enclosure. Provide gasketed and lockable door.

Base dissolved solids control on conductivity and include:

LED digital readout display (micromho/cm).

Temperature compensated sensor probe adaptable to sample stream manifold.

High, low, normal conductance indicator lights (LED).

High or low conductance alarm light (flash or steady switch), trip points field adjustable. Flash or steady switch shall have silence position.

Illuminated legend shall indicate "ALARM" whenever alarm condition exists.

Hand-off-automatic switch for solenoid bleed valve.

illuminated legend shall indicate "BLEED" when valve is operated.

Adjustable hysteresis or dead-band (internal).

Base inhibitor feed control on make-up volume and include:

Solid state counter (1-15 field selectable).

Solid state timer (adjustable 1/4 to 5 minutes).

Test switch.

Hand-off-automatic switch for chemical pump.

Illuminated legend shall indicate "FEED" when pump is activated.

Solid state lock-out timer (adjustable 1/4 to 3 hours) and indicator light. Lock-out timer shall deactivate the pump and activate alarm circuits.

Panel totalizer (amount of makeup), electro-mechanical type.

Biocide programmer to include:

24 hour timer with 14 day skip feature to permit activation any hour of the day.

Precision solid state bleed lock-out timer (0 - 9 hours) and biocide pump timer (0 - 2-1/4 hours), clock controlled.

Solid state alternator to enable the use of two different formulations.

Digital display of the time of day (24 hours).

LED display of day of week (14 days).

Fast and slow clock set controls (internal).

Battery back-up so clock is not disturbed by power outages, quartz timekeeping accuracy.

Hand-off-automatic switches for biocide pumps.

Illuminated legend shall indicate "BIOCIDE A" or "BIOCIDE B" when pump is activated.

Provide water meter on system make-up, wired to control system.

Provide solution pumps to feed sequestering agent and corrosion inhibitor from solution tank into condenser water supply to tower. Provide agitator as required.

Provide conductivity controller to sample condenser water and operate [11][_____] inch ([275][_____] mm) solenoid bleed valve and piping to blowdown controller sampler wired to open when condensing water pump is operating.

Introduce algaecide to tower by [intermittent slug feed.] [continuous feed with solution pump or solenoid valve on tank (chlorine).]

Provide liquid level switch in each solution tank to de-activate solution pump and agitator, and [sound local alarm bell.] [signal mechanical alarm system; refer to Section 15952.]

Provide 3/4 inch (19 mm) water coupon rack arounc circulating pumps with space for [4] [12] [_____] test specimens.

END OF SECTION