GUIDE SPECIFICATION SHEET - Skasol
GUIDE SPECIFICATION SHEET
Engineering Specifications for Cooling Tower Water Treatment System
PART 1 – PRODUCTS
1.1 GENERAL:
1.1.1 The contractor shall furnish and install an Electronic Water Treatment and Filtration System as shown and detailed on the contract documents. The units shall be installed in accordance with this specification Section, and perform at the conditions as listed.
1.1.2 Approved Manufacturers: Griswold Filtration
1.1.3 Subject to compliance with requirements, manufacturers offering products that may be incorporated into the “Work” include, but are not limited to, the following: Griswold Filtration, 2801 Barranca Parkway, Irvine, CA 92606; Phone: (949) 559-0671; Fax (949) 559-1431.
1.2 ELECTRONIC WATER TREATMENT AND CLEANING SYSTEMS FOR COOLING TOWERS
1.2.1 Furnish and install an Electronic water treatment and filtration system such as the Griswold Filtration Tower Sentry System. The system shall be used on condenser water, cooling tower recirculation systems and closed loop systems as specified herein. Devices that inject chemicals, use electrodes in the water, magnets, UV light, ozone, copper or silver ions, will not be accepted. The Electronic water treatment and filtration system shall be properly sized by the manufacturer to provide for complete control of Scale, Bacteria and Corrosion and the removal of precipitated debris without the use of any additional chemicals or biocides.
1.2.2 System Description and Operation:
1.2.2.1 For Condenser water, and cooling tower recirculation systems, the Tower Sentry System shall consist of an SBC and a skid mounted self-contained side stream filtration system with sweeper piping. For Closed Loop systems, the Tower Sentry System shall consist of an SBC and a skid mounted self-contained side stream filtration system. The SBC can either be installed full flow or installed on the self-contained side stream separator skid. The SBC is a solid-state, microprocessor-based water treatment system consisting of a Reaction Chamber in the form of a spool piece connected by an umbilical cable to the Driver/Controller. The Driver shall impart a complex modulated electric signal to the water flowing through the Reaction Chamber. This complex signal shall be imparted to the water by a series of solenoid coils. No electrodes that contact the water shall be acceptable.
1.2.2.2 The SBC will change calcium carbonate precipitate formation from surface nucleation (scale) to colloidal nucleation (bulk-solution powder).
1.2.2.3 The skid mounted self-contained side stream filtration system will remove debris via separation and keep the system free from new mineral scale on the fill material, pipes, heat exchangers, valves and other components in the system.
1.2.2.4 The SBC will control the population of microorganisms such as bacteria, and protozoa by incorporation into colloidal precipitates (encapsulation) or damaging via induced electric fields.
1.2.2.5 The Tower Sentry System may permit operation at lower blow down quantity resulting in water and energy savings. Note: Because the SBC operates by forming a powder precipitate, Cycles of Concentration cannot be measured accurately by use of conductivity measurements. The measurement of chloride in the water will give an accurate indication of Cycles of Concentration.
1.2.2.6 Blow down contains no added chemicals, aiding conformance to discharge regulations and provide for a “Green Technology”. The Tower Sentry System qualifies for “LEEDS” points under the innovative technology category.
1.2.2.7 A centrifugal vortex style, solids from liquid separator, shall be employed to remove particles from the fluid stream. Separator inlet must be capable of passing a solid sphere of size equal to 25% of the connection pipe size.
1.2.2.8 The separator’s head shall be stationary/non-removable with air vent for removing trapped air. (Standard on 2” and larger)
1.2.2.9 The separator shall have access, inspection port, to the separation chamber, for removing trapped solids.
1.2.2.10 Separator design does not require removable top for internal inspection. There are no movable parts or slots requiring maintenance.
1.2.2.11 Fluid shall enter the separator at a right angle to and tangent to the separator body.
1.2.2.12 The fluid velocity shall be caused to increase by the ‘velocity plate’, internal to the unit [Standard on .75” separator and larger]. Any device used to increase internal velocity shall pass a sphere equal to 25% of the diameter of the inlet nozzle.
1.2.2.13 The velocity increased fluid shall travel circumferentially downwards on the separators body, creating a cleaner central vortex, causing contaminates to rotate near the wall of the vessel, due to the centrifugal force exerted to the fluid stream.
Spin arrestor plates shall be installed under the bottom spin plate to allow settling of the solids and prevent solids to move upwards.
1.2.2.14 On 3” separators and larger, a top-spin-plate shall be installed at the center of the bottom spin plate to shorten the travel of the vortex. Additionally, the stream is further guided and directed by the path created by the spiral ring located at the bottom edge of the discharge nozzle. It is the outer edge of this ring that maintains the velocity and circular path of the solids down to the midsection of the separator body.
1.2.2.15 Cleansed fluid shall exit upward via the created vortex.
A second stage of centrifugal separation starts at the entry to the discharge nozzle, where a choke ring impedes the encircling smaller solids. A venturi effect is created in the two opposite nozzles angled toward the direction of the flow, drawing the solids to the low pressure side of the discharge nozzle, releasing them back into the main stream.
1.2.2.16 On 1.25” separators and larger, dual collection vanes at opposite direction shall be installed on top of the bottom spin plate at 60 degree angle facing the rotating fluid, to stop solids from rotating, and allow the solids to be immediately trapped and directed to the collection chamber.
1.2.3 SEPARATOR PERFORMANCE.
1.2.3.1 Separator design shall be of the low-pressure drop type.
1.2.3.2 In a single pass, given solids with a specific gravity of 2.6, performance is predicted to be 98% of 40 microns and larger. Further, particles finer in size with both heaver and lighter specific gravities will also be removed, resulting in the additional removal of a significant amount of particles, as small as 5 micron.
1.2.3.3 The separator shall be capable of removing solids up to 3% content by weight, in a single pass.
1.2.4 System Water Parameters:
1.2.4.1 Chemical analysis of the makeup water will be provided to factory to assist in the determination of the proper operation of the water treatment system.
1.2.4.2 Unless otherwise specified the units for the water analysis shall be in ppm or mg/L. The required parameters are as follows:
a. pH (measured on site in pH units)
b. Conductivity in (S
c. Calcium Hardness (ppm CaCO3)
d. Total Hardness (ppm CaCO3)
e. P-Alkalinity (ppm CaCO3)
f. m-Alkalinity (ppm CaCO3)
g. Chloride
h. Sulfate
i. Phosphate
j. Iron
k. Silica
1.2.4.3 Based upon actual make-up water quality, the Vendor will specify the recommended conductivity setting of the automatic blow-down system. The setting will be advantageous for scale inhibition and corrosion inhibition while possibly saving water and sewage cost, but may have to be adjusted to achieve the desired pH level.
1.2.4.4 Local environmental regulations may dictate the highest pH permitted for blow down. Cooling tower operator can raise or lower pH by the balancing of fresh make-up water and the amount of blow down.
1.2.4.5 Total bacteria count (TBC) of less than 10,000 CFU/ml will be maintained.
1.2.5 System Equipment
1.2.5.1 Driver
1.2.5.2 A wall mounted or skid mounted Driver shall be provided in a non-ventilated NEMA 3R enclosure that will prevent water from entering during wash down procedures.
1.2.5.3 All complex frequency modulated signals shall be directly controlled by an onboard microprocessor. The high frequency electric fields imparted to the flowing water shall include frequencies in the kilohertz and megahertz range. The range, selection of frequency and energy shall be under microprocessor control.
1.2.5.4 A Universal Power Supply shall be provided that can receive any power available in the range of 100–240 VAC, 50 to 60 Hz.
1.2.5.5 The Driver shall be MET Listed and Comply with UL 508A and CSA C22.2 No. 14.
1.2.5.6 A single LED Treatment light will be provided on the Driver door.
1.2.5.7 Includes an 8 ft. cord with 15-amp 110 VAC plug.
1.2.5.8 Includes a female locking connector for connecting the driver unit to the reaction chamber.
1.2.5.9 A supervisory relay will be designed to interface with building automation management systems. The interface to the building management system will be through a SPDT FORM “C” or dry relay contact (Energize to Close). Contact will open upon loss of power or loss of proper signal to Reaction Chamber.
1.2.6 Reaction Chamber
1.2.6.1 The Reaction Chamber shall consist of a weather-tight spool piece made of either Schedule 80 PVC or Fiberglass with either factory mounted ANSI 150 # PVC Flanged end connections[1” and larger], or slip connections [1” to 3”].
1.2.6.2 The Reaction Chamber shall be non-ventilated and meet NEMA 4X construction standards.
1.2.6.3 The Reaction Chamber shall be connected to the Driver by a 10-foot umbilical cable with locking connector and gold plated contacts. The cable cannot be lengthened or shortened without violating the Griswold Filtration Warranty.
1.2.6.4 The use of coils wound on job site or “wrap around” coils on existing pipe is not acceptable.
1.2.6.5 The use of coils that require ventilation and the use of rain shields for outdoor service will not be acceptable.
1.2.7 Conductivity Meter
1.2.7.1 A conductivity-actuated blow down system is integral to the Tower Sentry System, and is standard equipment when used in cooling tower and evaporative condenser systems. A toroidal probe is required.
1.2.8 Separator construction.
1.2.8.1 The separator shall be constructed to ASME standards with high quality carbon steel, or stainless steel as specified. ASME certified vessels are available upon request
1.2.8.2 Material thickness shall be a minimum 1/4” for non ASME vessels. ASME derived thickness will be per design calculations.
1.2.8.3 Separator shall have a clean out (std. on all separators) and auxiliary drain connection (standard on 3” larger).
1.2.8.4 The working pressure of the separator shall be 150 psig for non ASME vessels, or as required by the customer.
1.2.8.5 The separator shall be sandblasted and externally powder coated with blue finish.
1.2.9 Skid Mounted Self-Contained Side Stream Basin Sweeper System Equipment
1.2.9.1 Purge Valve. Bronze body with 304 stainless ball and stem motorized ball valve with spring return.
1.2.9.2 Recovery Tank. A recovery tank with 25-micron filter bag, inlet/outlet liquid filled gages and manual air vent, with sight glass.
1.2.9.3 Recovery Tank monitoring package. Dial indicator (Clean-Dirty-Change) differential pressure switch with N.O. dry contact, inlet/outlet stainless steel braided hoses and ball valves, threaded bronze body sight flow indicator with single window and ABS impeller.
1.2.9.4 Service Light. 120VAC 25-watt service light enclosed in a glass globe pendant mount fixture. Service light shall be mounted below the electrical control panel.
1.2.9.5 Pump and Motor.
Pump performance shall be stated at ________ gpm @ 80 TDH (HH & SP side stream cooling tower or below grade sump filtration with sweeper piping). HH system shall include an end suction cast iron pump case with bronze or cast iron impeller, close coupled or frame mounted to a TEFC motor with 1.15 service factor, standard mechanical seal. SP system shall include cast iron pump case with bronze, cast iron or glass filled Noryl corrosion abrasion resistant impeller, close coupled or frame mounted to a TEFC motor with1.15 service factor, standard mechanical seal.
1.2.9.6 Basket Strainer. Cast iron pump basket strainer with 1/4” perforated 304 stainless steel internal screen, bolted or quick opening cover.
1.2.9.7 Piping. Pipe assembly shall be constructed from carbon steel with a primer base/enamel blue exterior finish or schedule 80 PVC with enamel blue exterior finish.
1.2.9.8 Electrical Panel. Enclosure shall be NEMA 4 powder coated steel, NEMA 4X stainless steel, watertight, door interlock enclosure, fusible disconnect switch or disconnect starter with thermal overload, 120VAC magnetic contactor, 460/120VAC transformer with primary/secondary circuit breakers or fuses, pump “run” light, HOA, and terminal strip. Panel must be UL approved.
1.2.9.9 Base plate. The metal frame shall be constructed from carbon steel angle or channel, vertical box tubing, powder coated blue exterior finish.
PART 2 – EXECUTION
2.1 INSTALLATION
2.1.1. Install per Manufacturers IOM.
2.2 CONNECTIONS
2.2.1 Connect per manufacturers IOM.
2.3 START UP PROCEEDURES
2.3.1 Start up per manufacturers IOM.
2.3.2 A factory-authorized service representative will be present at system startup.
2.3.3 Inspect field-assembled components and equipment installation, including piping and electrical connections.
2.3.4 Inspect piping and equipment to determine that systems and equipment have been cleaned, flushed, filled with water, and are fully operational before turning on electrical power.
2.3.5 Place Cooling Tower water-treatment system into operation and calibrate controls during primary phase of Cooling Tower water-treatment system’s startup procedures.
2.4 FACTORY SUPPORT:
2.4.1 Pricing will include a service contract that will include initial startup, and a minimum of 1 visit per month for 1 year.
2.4.2 Service contract personnel will ensure the proper passivating of galvanized towers, if required.
2.4.3 These visits will verify the following:
The system blow down equipment is properly set and functioning.
The SBC system is turned on and working properly.
Chemical analysis shows that pH, Conductivity, Chloride, Total Bacteria Count and Cycles of Concentration are in the expected range.
END OF SPECIFICATION
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GF-1030-G
REV. 05-08
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