SECTION 232500 - WATER TREATMENT
PART 1 - GENERAL
1.1
RELATED DOCUMENTS
A.
1.2
SECTION INCLUDES
A.
B.
C.
D.
1.3
1.5
Treatment for open, evaporative cooling water systems (real-time, standard)
Treatment for closed recirculating water systems (less than 20,000 gallons)
Glycol Feed for closed recirculating water systems
Chemical Storage
SUBMITTALS
A.
1.4
Drawings and general provisions of the Contract, including General and
Supplementary Conditions and Division 1 Specification Sections, apply to
this Section.
Refer to General Conditions, Division 1 and Section 15010
OPERATION AND MAINTANANCE DATA
A.
Refer to General Conditions, Division 1 and Section 15010.
B.
Include data on all equipment, including spare parts lists, and product data
and MSDS for all chemical treatments required.
C.
Include step by step instructions on testing procedures, including target
concentrations.
QUALIFICATIONS
A.
Water Treatment Contractor shall specialize in the manufacturing and assembly of
water treatment formulations and equipment systems with a minimum of ten (10)
years documented experience. Water Treatment Company shall have local
representatives, full time service personnel, and water analysis laboratory.
B.
Water Treatment Contractor shall provide water treatment equipment systems and
chemicals for all water using systems as specified. It shall be the responsibility of
the water treatment contractor to provide appropriate chemical treatment products
and to properly size all components of the equipment system(s). The mechanical
contractor shall install these equipment systems per the water treatment
contractor’s instructions.
WATER TREATMENT 232500-1
1.6
REGULATORY REQUIREMENTS
A.
1.7
1.8
Discharge from any treated system shall be directed to sanitary sewers and shall
not result in contaminant levels which are in excess of standards set forth by the
appropriate water pollution control authority.
MAINTENANCE SERVICE
A.
Provide service and maintenance of the water treatment systems, including
chemical treatment products, for control of scale formation, corrosion, and
microbiological growth in all treated systems from the date of start-up through the
warranty period, or for a maximum of one (1) year, whichever comes first.
B.
Provide monthly technical service calls and perform field inspections including
on-site water analysis of all treated systems. Detail findings in a written report,
including chemical testing results and corrective actions needed.
C.
Provide laboratory and technical assistance for warranty period.
D.
Provide comprehensive operator training, including care, maintenance, testing and
operation of water treatment systems.
E.
Provide on-site inspection of equipment during scheduled shutdowns to properly
evaluate success of water treatment program and make recommendations in
writing based upon these inspections.
MAINTENCE MATERIALS
A.
Submit maintenance materials under provisions of General Conditions, Division 1
and Section 15010.
B.
Provide sufficient chemicals for treatment and testing during the warranty period.
PART 2 - PRODUCTS
2.1
MANUFACTURERS
C.
2.2
All items in this section shall be provided by a single water treatment firm and
shall be H-O-H Water Technology, Inc. or approved equal.
WATER TREATMENT EQUIPMENT
A.
Open Evaporative Cooling Water Systems (real-time, Standard)
232500-2 WATER TREATMENT
1.
Provide and install equipment for automatic control of both chemical feed
and bleed-off. Equipment shall operate in response to make-up water flow
and system water conductivity. Equipment system shall provide instant
real-time access from the internet with the ability to control, monitor and
report cooling water system conditions using a standard web browser.
Equipment system shall be H-O-H Water Technology Model C-90EC and
shall consist of the following components:
a.
b.
c.
Control panel shall be microprocessor based conductivity and
water meter activated chemical feed and bleed-off controller with
dual programmable biocide timers. Control panel sensor plumbing
assembly shall include a conductivity sensor and flow switch.
Control panel shall include turbine water meters installed in the
make-up water piping and bleed-off water piping fitted with a
three-valve by-passes. Turbine water meters shall generate a low
voltage electronic signal and shall be connected to the control
panel using 4-wire shielded cable. Control panel shall have eight
(8) NO/NC relays, (4) 4-20 mA inputs, and three (3) digital inputs.
The control panel shall incorporate eService Reports and be
accessible by Ethernet or modem from anywhere via the Internet.
Control panel shall provide multiple security levels for various
users, controller changes via the Internet, email notifications for
data logs, alarms, and system summaries. Panel shall be equipped
with terminal strip connections for 120VAC60C power, for
output circuits and flow switch, conductivity sensor, and make-up
and bleed-off turbine water meters. Control panel enclosure shall
be NEMA 4X and suitable for wall mounting. Control panel shall
be eController Model CEC8 Series.
Chemical metering pump shall be positive displacement type with
liquid handling end of acrylic with PVC fittings. Chemical pump
shall have adequate pressure rating and capacity to inject chemical
treatment at the required dosage rate. Chemical pump shall be
supplied complete with foot valve/strainer, suction and discharge
valves, and injection check/back pressure valve. Valves shall have
ceramic check balls, Viton seats, and compression connections for
polyethylene tubing. Chemical pumps shall use 120VAC/60C
power from the control circuit. Chemical metering pump shall be
Iwaki, LMI, or Pulsatron.
Pump mounting bracket shall be plastic construction, 6” X 6.5”
dimensions with predrilled holes and suitable for wall mounting.
Pump mounting bracket shall be LMI Model 34643.
WATER TREATMENT 232500-3
d.
Injection assembly shall include a Kynar injection quill and a
schedule 80 PVC ball valve with a maximum pressure rating of
125 psi at 100˚ F. Injection assembly shall have ½” NPT
connections with a quill insertion length equal to at least 25% of
the pipe diameter to inject chemical into system water flow.
Injection assembly shall be H-O-H Water Technology Model
4001.
e.
Bleed-off solenoid valve shall be two (2) way pilot operated,
normally closed, and rated for general service. Solenoid valve
shall be brass construction with water tight electrical enclosure and
NPT connections. Solenoid valve shall be installed in the bleedoff piping immediately downstream of a strainer and shall use
120V/60C power from the control circuit. Bleed-off solenoid
valve shall be ASCO 8210 series.
f.
Corrosion coupon rack shall be preassembled, constructed of 1”
NPT carbon steel pipe. Rack shall have four (4) 1” FPT openings
for the mounting of corrosion test coupons and shall include a Dole
Model 15GX Flow Control for continuous flow regulation. Racks
shall be installed between system supply and return piping.
Corrosion Coupon Rack shall be H-O-H Water Technology Model
2120.
2.
Provide and install equipment for automatic feed of biocides for
positive control of microbiological growth in the cooling water.
Equipment shall operate in response to make-up water demand
and/or programmed schedule. Biocide feed equipment shall
facilitate automatic addition of liquid, oxidizing and non-oxidizing
biocides to the cooling water system to control biological activity,
including slime formers, water borne pathogens, sulfate reducing
bacteria, algae, and microbiologically induced corrosion (MIC).
Biocide dosage shall be programmed and controlled using external
load circuits from the control panel and the output adjustments on
the chemical pumps. Biocide feed equipment system shall consist
of the following components:
a.
Chemical metering pumps shall be positive displacement type with
liquid handling end of acrylic with PVC fittings. Chemical pumps
shall have adequate pressure rating and capacity to inject chemical
treatment at the required dosage rate. Chemical pumps shall be
supplied complete with foot valve/strainer, suction and discharge
valves, and injection check/back pressure valve. Valves shall have
ceramic check balls, Viton seats, and compression connections for
232500-4 WATER TREATMENT
polyethylene tubing. Chemical pumps shall use 120VAC/60C
power from the control circuit. Chemical metering pump shall be
Iwaki, LMI, or Pulsatron.
B.
b.
Pump mounting brackets shall be plastic construction, 6” X 6.5”
dimensions with predrilled holes and suitable for wall mounting.
Pump mounting brackets shall be LMI Model 34643.
c.
Injection assemblies shall include a Kynar injection quill and a
schedule 80 PVC ball valve with a maximum pressure rating of
125 psi at 100˚ F. Injection assemblies shall have ½” NPT
connections with a quill insertion length equal to at least 25% of
the pipe diameter to inject chemical into system water flow.
Injection assemblies shall be H-O-H Water Technology Model
4001.
d.
Refer to H-O-H Water Technology drawing CWT300.
Closed Recirculating Water Systems (Less than 20,000 gallons)
1.
Provide and install equipment for manual addition of chemical treatment
and removal of suspended solids for each closed recirculating water
system. Equipment shall consist of the following components:
a.
Make-up Water Meter shall be cold water oscillating type rated for
industrial use. Meter shall be of bronze construction with NPT
union connections, standard register totalizing in gallons,
maximum pressure rating of 150 psi, and maximum temperature
rating of 110°F. Water Meter shall be installed in the make-up
water piping to the system fitted with a three (3) valve by-pass.
Water meter shall be Carlon STD Series.
b.
By-Pass Feeder shall be five (5) gallon capacity, steel construction
with maximum operating pressure of 300 psi at 200ºF. By-pass
feeder shall have 4” wide opening with cast iron, course thread,
quick opening top closure, demountable leg extensions, and ¾”
NPT inlet, outlet and drain fittings. By-pass feeder shall be
installed across the common discharge and suction piping of the
recirculating pumps. By-pass feeder shall be Neptune Model
DBF-5HP.
c.
Cartridge Filter Vessel shall be 304 stainless steel construction
with maximum operating pressure of 150 psi at 250ºF. Filter
WATER TREATMENT 232500-5
vessel shall be split shell construction with NPT inlet, outlet,
bottom drain, and top vent fittings. Filter vessel shall be installed
across the common discharge and suction piping of the
recirculating pumps and shall be sized to filter the equivalent of the
system water volume once every four (4) hours. Filter Vessel shall
be as manufactured by Cuno or Flowmatic.
d.
Filter cartridges shall be wound polypropylene media with a tin
core, ten (10) micron rating, and a maximum temperature of 200º F
sized to properly fit the filter vessel. Filter cartridges shall be
furnished in a quantity sufficient for six (6) complete changes of
the filter vessel. Filter cartridges shall be changed when the
pressure drop across the filter vessel exceeds 20 psi, or as
recommended by the water treatment contractor.
e. Corrosion coupon rack shall be preassembled, constructed of 1”
NPT carbon steel pipe. Rack shall have four (4) 1” FPT openings
for the mounting of corrosion test coupons and shall include a Dole
Model 15GX Flow Control for continuous flow regulation. Racks
shall be installed between system supply and return piping.
Corrosion Coupon Rack shall be H-O-H Water Technology Model
2120.
f.
C.
Refer to H-O-H Water Technology drawing CLSD212
Glycol Feed Equipment System (closed recirculating water systems)
1.
Provide and install equipment for automatic feed of glycol/water solution
for each closed recirculating water system. Equipment shall be a
completely preassembled package and shall operate in response to
recirculating system pressure. Glycol feed equipment system shall be
Neptune Model G and shall consist of the following components:
a.
Pump shall be a bronze rotary gear pump with a capacity of 1.5
gpm at 100 psi. Pump shall be mounted below the tank.
b.
Tank shall be constructed of polypropylene and be provided with a
four-leg carbon steel stand with four bolt pads. The tank stand
shall have upper and lower steel support banding to insure tank
stability. Tan stand shall be painted with a two-coat system
consisting of an oxide primer and alkyd enamel finish.
c.
Pump suction piping shall be piped using PVC fittings and tubing.
A PVC ball valve and a cast iron “Y” strainer shall be provided in
232500-6 WATER TREATMENT
the pump suction piping. Pump discharge manifold shall be piped
using schedule 40 brass fittings suitable for chilled or hot water
service. A pressure switch, ball valve, brass check valve and brass
pressure relief valve shall be mounted on the pump discharge
assembly manifold. Piping shall be supported at both the top and
bottom of the tank frame. The brass relief valve shall be piped
back to the tank using PVC tubing and fittings. A pressure gauge
shall be mounted in the discharge piping.
D.
d.
Control panel shall incorporate an H-O-A selector switch with
running light and magnetic starter for feed pump. In AUTO, the
pump is operated by the skid-mounted differential (adjustable)
pressure switch and interlocked to a low level float switch mounted
in the side of the tank. Level switch also energizes a low level
audible alarm with silence push button for alarm
acknowledgement. Panel shall be mounted to the tank frame and
positioned at eye level for ease of operation. Panel shall be
equipped with 120VAC60C power cord. All electrical
components shall be wired in conduit to control panel.
e.
Refer to H-O-H Water Technology drawing CLSD314
Chemical Storage
1.
Provide and install chemical storage tanks for each chemical
treatment product. Chemical storage tanks shall be sized to
accommodate a three (3) to four (4) month supply of treatment
chemicals. Chemical storage tanks shall provide secondary
containment and exhibit the following characteristics:
a.
2.3
Storage tanks shall be 1/4" thick virgin, high density, linear link
polyethylene, and natural color. Storage tanks shall be flat bottom,
molded top with chemical pump mounting indentations, suction
openings, and one (1) manway with closure. Storage tanks up to a
capacity of 110 gallons shall be rectangular in shape with a
maximum width of 34" to fit easily through a standard door.
Larger chemical storage tanks shall be cylindrical in shape.
Chemical storage tanks shall be Bulk Systems Diketank or
Cylindrical Diketank.
CHEMICALS
A.
Open Evaporative Cooling Water Systems (real-time, Standard)
WATER TREATMENT 232500-7
B.
1.
Scale and corrosion control shall be provided using a liquid treatment
formulated to maintain open cooling water systems free of scale, corrosion
and fouling under normal operating conditions. Scale control shall be
accomplished without the use of acid up to 700 ppm of hardness, and
corrosion rates of steel components of the system shall be less than two (2)
mpy. Scale and corrosion inhibitor shall be H-O-H Water Technology C458 Cooling Water Treatment.
2.
Control of microbiological activity, including slime formers, water borne
pathogens, sulfate reducing bacteria, algae, and microbiologically induced
corrosion (MIC) shall be by a liquid non-oxidizing biocide. Nonoxidizing biocide shall be effective over a wide pH range and shall be
compatible with oxidizing biocides and scale and corrosion inhibitors.
Biocide shall be EPA registered source of isothiazolins and produce no
environmentally objectionable toxic byproducts. Biocide shall be H-O-H
Water Technology A-615 Antimicrobial Agent.
3.
Control of organic foulants shall be by a liquid oxidizing biocide.
Biocide shall be stabilized bromine and chlorine solution, EPA registered
and produce minimal environmentally objectionable byproducts.
Oxidizing biocide shall be compatible with non-oxidizing biocide and
scale and corrosion inhibitors. Oxidizing biocide shall be H-O-H
Water Technology A-11 Antimicrobial Agent.
Closed Recirculating Water Systems (less than 20,000 gallons)
1.
C.
Corrosion control shall be provided using a single liquid treatment
formulated to maintain closed recirculating water systems free of
corrosion under normal operating conditions. Corrosion inhibitor shall
provide protection for both ferrous and non-ferrous metals and shall not be
detrimental to non-metallic materials such as pump packing and valve
seats. Corrosion inhibitor shall be compatible with and provide required
pH and alkalinity for propylene and ethylene glycol types of anti-freezes.
Corrosion rates in the system shall be less than .10 mpy. Corrosion
inhibitor shall be H-O-H Water Technology CS-38 Closed System
Treatment.
Glycol Closed Recirculating Water Systems
1.
Inhibited propylene glycol shall be provided to protect closed recirculating
water systems against freezing and corrosion. Inhibited propylene glycol
shall contain 95.5% virgin, industrial grade propylene glycol and a
232500-8 WATER TREATMENT
corrosion inhibitor package formulated to provide the required pH and
alkalinity levels. Corrosion inhibitor shall provide protection for both
ferrous and non-ferrous metals and shall not be detrimental to non-metallic
material such as pump packing and valve seats. Inhibited propylene
glycol shall be H-O-H Water technology ProKool-38.
2.4
TEST EQUIPMENT
A.
Provide and install test cabinet with light, lock, and acid resistant enamel finish,
suitable for wall mounting. Cabinet shall be equipped with necessary glassware
and test sets necessary to monitor water treatment program. Test sets shall consist
of 10 ml. burettes and 16-ounce squeeze-type polyethylene reagent bottles. Test
cabinet shall be H-O-H Water Technology Model 1095.
PART 3 - EXECUTION
3.1
WATER ANALYSIS
A. Perform an analysis of supply water to determine the type of water treatment and
quantities of chemical treatment needed to maintain acceptable water quality as
specified in "Performance Requirements" Article.
3.2
INSTALLATION
A. Install water treatment equipment level and plumb. Maintain manufacturers
recommended clearances. Arrange units so that controls and devices requiring
servicing are accessible.
3.3
CONNECTIONS
A. Piping installation requirements are specified in other Division 15 Sections.
Drawings indicate general arrangement of piping, fittings, and specialties.
B. Install piping adjacent to equipment to allow service and maintenance.
C. Confirm applicable electrical requirements in Division 16 for connecting
electrical equipment. Power and control and interlock wiring materials and labor
provided by Division 16.
3.4
FIELD QUALITY CONTROL
A. Engage a factory-authorized service representative to perform startup service.
WATER TREATMENT 232500-9
B. Inspect field-assembled components and equipment installation, including piping.
Report results in writing.
C. Inspect piping and equipment to determine that systems and equipment have been
cleaned, flushed, and filled with water, and are fully operational before initiating
water-treatment system.
D. Prior to acceptance by the owner, all grease, dirt, oil and metallic oxides shall be
removed from each water system. Mechanical contractor shall inform the water
treatment contractor of all the system materials of construction to insure chemical
cleaner compatibility. Supervision and cleaner shall be provided by H-O-H
Water Technology. The following cleaning procedure shall apply:
1.
Closed Recirculating Water Systems (less than 20,000 gallons)
a.
The system shall be filled through a suitable water meter to
determine total water volume, taking care to bleed all air.
b.
With the system circulating, flow will be verified throughout the
system. All debris shall be flushed from the system and all
strainers cleaned.
c.
H-O-H Water Technology C-312 Multi-Purpose Cleaner shall be
added to the system at a dosage rate of twenty (20) gallons per one
thousand (1,000) gallons of system volume. The chemical
treatment contractor shall verify cleaner strength.
d.
Hot water systems shall be heated to 160-180ºF and circulated for
twenty-four (24) hours. Chilled water systems shall be circulated
for forty-eight (48) hours.
e.
During the cleaning period, system water shall be circulated
through the entire system. Mechanical contractor shall insure that
all small orifices (control valves, strainers, etc.) remain free of
debris. A side stream filter shall be used for removal of suspended
solids during the cleaning period. Filter Media shall be changed as
required.
f.
When cleaning period is complete, the system shall be drained and
flushed with fresh water to remove the cleaning solution. Flushing
shall continue until the total (M) alkalinity of the system water is
within fifty (50) ppm of the total alkalinity of the make-up water.
f.
All strainers, dead legs, and areas of low flow shall be thoroughly
232500-10 WATER TREATMENT
flushed to remove accumulated debris.
Immediately following completion and verification of flushing, certification
records covering the cleaning shall be submitted to the mechanical contractor.
Records shall include system volume, cleaner concentration, circulation time, and
final alkalinity reading. Each system shall be chemically treated as provided
elsewhere in this specification.
E.
3.5
Place water-treatment system into operation during the preliminary phase of
systems' startup procedures.
DEMONSTRATION
A.
Engage a factory-authorized service representative to train Owner's maintenance
personnel to adjust, operate, and maintain water-treatment systems and
equipment.
B.
Train Owner's maintenance personnel on procedures and schedules for starting
and stopping, troubleshooting, servicing, and maintaining equipment and
schedules.
C.
Review data in maintenance manuals, especially data on recommended parts
inventory and supply sources and on availability of parts and service. Refer to
Division 1 Section "Operation and Maintenance Data."
D.
Schedule training with Owner, through Architect, with at least seven days'
advance notice.
END OF SECTION 232500
WATER TREATMENT 232500-11