EVAPORATIVE COOLING WATER TREATMENT SYSTEM

A.	GENERAL
1. DESCRIPTION
a. Work Includes:
1) Furnish all labor, materials, tools, equipment and services for condenser water treatment system as indicated, in accordance with provisions of the contract documents.
2) Completely coordinate with work of all other trades.
3) See Division 1 for General Requirements.
4) Manufacturer’s representative company will provide automatically controlled water treatment program and equipment as specified herein.
5) Provide monthly service for the condenser water treatment program, including the necessary chemicals designed to minimize corrosion, scale formation and biological growth in the following mechanical systems:
a) Condenser Water Piping System
b. Description of System:
1) Skid mounted solid-chemistry inhibitor feeder by equipment manufacturer.
2) Skid mounted bio-control feeder(s) (by equipment manufacturer) capable of feeding granular biocide without supplemental makedown water.
3) Solid chemistry formulated to control scale, corrosion and microbiological activity.
4) Factory mounted (by equipment manufacturer) conductivity controller and probe manifold.
5) Motorized ball valve for bleed
2. SUBMITTALS (See Division 1)
a. Submit per the requirements Division 1.
b. Shop drawings: Show all water treatment equipment, including the following:
1) Piping diagrams of all skid mounted components.
2) Conductivity control panel and wiring diagrams (describe all field wiring required). Include bill of materials showing model number, manufacturer, physical layout drawings, panel and equipment catalog cuts.
c. Operation and maintenance manuals: Include testing procedures for each of the treated systems.
d. List of chemicals and methods to be used for each system: Use generic names. Provide Material Safety Data Sheets (MSDS) for each chemical used.
e. Laboratory analysis of project site make-up water: Submit a copy of a laboratory analysis documenting the quality of the project's make-up water. Make-up water analysis to include the following analytes as a minimum:
Calcium Hardness (as ppm CaCO3)
Total Hardness (as ppm CaCO3)
Total Alkalinity or m-Alkalinity (as ppm CaCO3)
pH
Silica (as SiO2)
Specific Conductivity (micro S/cm)
Sulfate (as SO4)
Chloride (as Cl-)
Phosphate (as PO4)
3. QUALITY ASSURANCE
a. The water treatment supplier shall:
1) Obtain water samples from the site and furnish a laboratory analysis of the water supply with submittal.
2) Review the make-up water analysis to ensure compatibility with the water treatment program.
3) Propose water treatment methods and appropriate chemicals required to minimize scale, corrosion and biological growth. Submit all of the above with shop drawings and other required submittals.
b. Methods and chemicals selected shall comply with all the requirements of the American Public Health Association (APHA), the Environmental Protection Agency (EPA) and local environmental agencies.
4. PERFORMANCE CRITERIA
a. Base water treatment products on the quality of makeup water available at project site, evaporative cooling equipment’s materials of construction and functional performance characteristics, along with the requirements and guidelines of authorities having jurisdiction.
b. Mechanical contractor shall pre-clean and flush the open hydronic system including spray water system prior to startup. Any chemicals utilized during pre-clean and flush shall be compatible with all materials of construction utilized in the open hydronic system. Immediately following the pre-clean and flush procedure, the system shall be operated to maintain the water qualities listed below or drained from a low point in the system if immediate operation is not possible:
1) pH: shall maintain a value between 7.0 to 9.0 for all systems which contain any components manufactured with galvanized materials of construction
2) Total Aerobic Plate Count: Maintain a maximum value of 10,000 CFU/ml or less
3) Soluble Copper: Maintain a maximum value of 0.25 PPM or less
c. Biological Control:
1) A solid biocide treatment program shall be initiated when the condenser water system is first filled with water and shall be administered on a regular basis thereafter in accordance with the supplier’s instructions. System shall be inspected for proper operation whenever microbiological testing indicates counts above performance criteria. Corrective action shall be taken whenever two successive tests indicate biological activity above this level.
B. PRODUCTS
1. WATER TREATMENT SYSTEM
a. Acceptable Products:
1) Chemical Feed & Control Equipment
a) Skid mounted inhibitor feeder
b) Skid mounted biocide feeder(s)
c) Factory mounted conductivity controller, piping manifold with conductivity probe and sampling port
d) Motorized ball valve for bleed
b. Chemicals
1) Chromates, zinc, or any liquid chemicals shall not be used.
2) Scale and corrosion inhibitor shall be formulated with a tracer dye that is detectable by an inhibitor probe.
3) Phosphates are allowed as permitted by EPA and local authorities.
4) Scale and corrosion inhibitor chemistry shall be provided in a solid form to minimize required storage space and material handling.
5) The chemical feed equipment shall operate and feed chemicals into the condenser water system only when the systems recirculating pumps are in operation.
6) Biocides shall be provided in granular form to minimize required storage space and material handling.
c. Condenser Water System:
1) Chemical feed and control equipment - condenser system: Provide the following components.
a) Skid mounted assembly for controlling conductivity and feeding solid chemical treatment into the condenser water system(s). The treatment system shall have the following features and capabilities:
Conductivity controller: The control system shall be capable of measuring makeup conductivity, condenser water conductivity, temperature, and corrosion inhibitor residual. Additional inputs shall include a flow switch and two water meter inputs.
1) Inhibitor feed: Solid chemical inhibitor shall be introduced to the system from a skid mounted feeder installed on a side-stream loop across the system pumps. The inhibitor must be fed independent of make-up, blowdown or timer. No pumps or liquids shall be accepted.
2) Biocide feed: The biocide program shall consist of two different biocides. Biocide chemistries shall be compatible with the scale and corrosion inhibitor program and be fed at biocidal dosages at least twice a week. Biocide chemistries must be in solid or granular form to minimize storage space requirements, material handling and waste. No pumps or liquids shall be accepted. 
The biocide program shall be administered from a controller capable of feeding on a programmed time schedule. The controller shall have a pre-bleed and lockout function for each biocide and be capable of feeding on a 28 day schedule and a recycle timer.
3) Basis of design – EVAPCO Smart Shield® Monitored Release System.
b) The conductivity controller, chemical feeders and sample stream piping assembly shall be factory mounted (by evaporative cooling equipment manufacturer) on treatment skid(s). The packaged system shall consist of the following:
1) One (1) sample stream piping assembly consisting of:
a) One (1) 1 inch inlet/outlet shut-off valves.
b) One (1) conductivity probe of PVC construction, with a temperature compensating toroidal probe mounted in the sample stream.
c) One (1) inhibitor probe of PVC construction, with 4 – 20 mA Output.
2) One (1) motorized ball valve. Bleed-off piping assembly shall be sized to provide the proper bleed-off rate of the system.
3) Skid mounted solid chemical inhibitor feeder(s) shall be provided for feed of the scale and corrosion inhibitor.
4) Skid mounted solid biocide chemical feeders shall be provided for feed of dual biocides. Feeders shall be completely factory mounted on skids for easy commissioning and startup.
2) Water treatment chemicals: Calculate and furnish 1-year supply of the recommended products for control of scale and corrosion in the open recirculating system. Additionally, calculate and furnish a 1- year supply of dual biocides for control of microbiological growth in the same system. The one year supply of chemistry shall be calculated based on the most efficient cycles of concentration the make-up water quality will allow. Biocide products recommended shall be properly registered with the Environmental Protection Agency and EPA registration number shall be clearly shown on all product literature and package labels. To ensure operator safety, all chemical products shall be provided in solid or granular form for reduced material handling.
d. Testing equipment: Provide water test kits and equipment necessary to control the condenser water systems treatment program. Test kits to include the following as a minimum:
1) Reagents and apparatus for determination of corrosion inhibitor level in the condenser water systems.
2) Reagents and apparatus for determination of pH, total alkalinity, free and total chlorine, and calcium hardness.
3) Apparatus for determination of microbiological colony population and biocide effectiveness.
C. EXECUTION
1. INSTALLATION AND SERVICES
a. Installation of water system will include:
1) For open tower systems, remote sump condensers or remote sump closed circuit coolers the components shall be mounted by the mechanical contractor.
2) Supply all components (coils, transformers, conductivity meters, blow down valves etc) necessary for a completely automated stand-alone system. Blow down valves shall be motorized ball valves power open, spring return factory mounted during unit construction.
3) Immediately after hydrostatic testing of piping is completed the mechanical contractor shall drain, flush, clean and passivate all systems. Subsequent to the cleaning process, each system shall be re-filled with clean water prior to the system being placed into operation. Once filled the condenser water pump and cooling tower fans shall be operated until conductivity set point is achieved.
4) Mechanical contractor shall pipe all bleed and drain lines to sanitary sewer.
b. Provide all consulting services, for a period of 1-year from start-up of the cooling system, which will include:
1) Installation and system start-up procedure recommendations.
2) Initial water analysis and recommendations.
3) Training of operating personnel on proper feeding and control techniques.
4) Monthly field service visits during wet operation.
5) Any necessary log sheets and record forms.
c. All services will be provided by a factory authorized service provider of the evaporative condenser, cooling tower or closed circuit cooler manufacturer.