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) Riser mounted solid-chemistry inhibitor feeder by equipment manufacturer.
2) Unit mounted bio-control feeder(s) (by equipment manufacturer) capable of feeding granular biocide without supplemental makedown water.
3) Solid, controlled release chemicals as specified below.
4) Factory mounted (by equipment manufacturer) conductivity controller and bleed valve as specified below. System shall be self-draining.
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 factory mounted components (show all field piping required, if any).
2) Conductivity control panel and wiring diagrams (show 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. Maintain the conditions listed below in the water system(s):
1) Conductivity range of 300 to 5,000 micro S/cm.
2) pH range of 7.0 to 8.8
3) Local environmental regulations may dictate the highest pH permitted for blowdown. The conductivity setting can be adjusted up or down to change the pH by the balancing of fresh make-up water.
4) Total bacteria count (TBC) of less than 10,000 CFU/ml.
5) Keep condenser water system scale free and corrosion to levels acceptable by AWT guidelines.
B. PRODUCTS
1. WATER TREATMENT SYSTEM
a. Acceptable Products:
1) Chemical Feed & Control Equipment
a) Factory mounted inhibitor feeder
b) Factory mounted biocide feeder
c) Factory mounted conductivity controller, piping manifold with conductivity probe and sampling port
b. Chemicals
1) Chromates, zinc, or any liquid chemicals shall not be used.
2) Scale and corrosion inhibitor shall be non-toxic to humans and animals for its intended use.
3) Phosphates are allowed as permitted by EPA and local authorities.
4) Scale and corrosion inhibitor chemistry shall be provided in a solid form with controlled released polymer coating for safe handling and easy reloading.
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) The granular biocide shall be packaged such that handling of the chemistry directly is minimized.
c. Condenser Water System:
1) Chemical feed and control equipment - condenser system: Provide the following components (including all factory piping and wiring).
a) Factory mounted assembly for controlling conductivity and providing automatic solid chemical treatment to the condenser water system(s). The assembly system shall have the following features and capabilities:
Conductivity controller: Shall provide linear, temperature compensated measurements directly in micromhos over full range. Conductivity measurement will be displayed on an LED display. Controller will have a USB port and shall be capable of retrieving operational frequency of bleed valve, output contact, make-up/bleed metering over a 60 day period.
1) Inhibitor feed: Inhibitor chemical shall be fed directly from the unit riser pipe. A solid chemistry inhibitor shall be used with time released control mechanism. No pumps, timers or liquids shall be accepted.
2) Biocide feed: Biocide chemical feeds will be controlled by a factory mounted feeder. Solid biocide will be fed directly into the recirculating stream. No pumps, timers or liquids shall be accepted.
3) Basis of design - EVAPCO Smart Shield®
b) The conductivity controller, chemical feeders and sample stream piping assembly shall be factory mounted on the closed circuit cooler or evaporative condenser. All components of the system shall be pre-plumbed and pre-wired to minimize field connections required to provide an operational treatment system. The packaged system shall consist of the following:
1) One (1) sample stream piping assembly consisting of:
a) Two (2) 1 inch inlet/outlet shut-off valves.
b) One (1) conductivity probe of PVC construction, with a temperature compensating torodial probe mounted in the sample stream.
2) One (1) pre-piped bleed-off piping assembly consisting of inlet shut-off valve, sample valve, throttling valve and motorized ball valve. Bleed-off piping assembly shall be sized to provide the proper bleed-off rate of the system. Bleed piping and controller should prevent the feed of biocide during the bleed cycle.
3) Factory mounted solid chemical inhibitor feeder(s) shall be provided for feed of the scale and corrosion inhibitor. Feed rate shall be adjustable based on a multiple chamber feeder arrangement.
4) Factory mounted solid biocide chemical feeder(s) shall be provided for feed of the biocide. Feeder shall be completely factory mounted for easy commissioning and refill.
2) Water treatment chemicals: Calculate and furnish 1-year supply of the recommended product for control of scale and corrosion in the open recirculating system. Additionally, calculate and furnish a 1- year supply of biocide 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 product 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) All components shall be mounted by the evaporative equipment manufacturer during unit construction and prior to shipment from the factory.
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.
5) If the working height of the water treatment system will be elevated, there shall be a safe way to service the system provided.
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) Pre-operation system clean-out procedure supervision.
3) Initial water analysis and recommendations.
4) Training of operating personnel on proper feeding and control techniques.
5) Monthly field service visits during wet operation.
6) Any necessary log sheets and record forms.
c. All services will be provided by a factory authorized service provider of the evaporative condenser or closed circuit cooler manufacturer.