Memorial Hermann Best Practices s4

Memorial Hermann Best Practices July, 2013

SECTION 23 25 00 CHEMICAL WATER TREATMENT

PART 1 - GENERAL

1.01 INCLUDED WORK

A. Furnish and install chemical water treatment systems complete with equipment, piping, tubing, and interconnection components, electric controls, and water treatment materials and chemicals, and test equipment and chemicals necessary maintaining water treatment program. Mechanical and General Contractor to provide tie-ins, hot taps, piping, power, and communication connections for the systems as part of this contract.

B. Equipment, material, and chemicals shall be provided by a single water treatment firm for individual responsibility to insure system compatibility.

C. For additions or renovations requiring water treatment, supplier shall consult with the operating maintenance personnel and obtain services and equipment as requested by them.

D. The products and systems set forth in Part 2 are performance oriented without regard to raw water conditions at the site, existing special conditions or an individual manufacturer's equipment or chemicals. Proposers shall obtain samples of the water to be supplied to the facility, analyze it and submit their proposals for equipment and chemicals based on the water to be treated and any other special conditions. A copy of the water analysis must be furnished with the proposal. The requirements of this paragraph also apply to additions and renovations to existing facilities where the proposer is already rendering chemical water treatment.

E. The chemical water treatment supplier shall provide necessary products for boiler boilout, boiler water treatment, boiler feed system, cooling tower, condenser systems cleanout, initial passivation treatment of galvanized towers if applicable (against white rust), cleaning, passivation/treatment and operation of closed water and steam systems, and for a maximum of three months treatment of all open and closed water/steam systems during operation of the facility after Owner acceptance.

F. The chemical water treatment company technical representative shall develop and administer a program for routine chemical treatment and testing for use of Maintenance Personnel after systems have been placed in operations. Provide initial training session limited to no more than 4-hours and two follow up training sessions of 2-hours or less every three to six months.

1.02 RELATED WORK

A. Section 23 05 00: Common Work Results for HVAC

1.03 SUBMITTALS

A. Submit shop drawings, product data, coordination items, and manufacturer's installation instructions for review.

PART 2 - PRODUCTS

2.01 ACCEPTABLE SUPPLIERS

A. Acceptable suppliers shall be located within the Houston Metro area and include: 1. Chemtreat 2. ChemCal, Inc.

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B. Chemical water treatment supplier must have qualified service representation and backup technical personnel within 50 miles of facility, shall render monthly service at a minimum to facility, and be available for emergency service as required.

2.02 CONTROLLER UNITS

A. Water treatment controllers for the condenser and steam boiler water systems shall be self- contained within their own NEMA-type housing. Controller power supplies and circuitry shall be protected from power surges/spikes/outages utilizing a UPS or other appropriate system. Controllers shall have communications link for remote access by the water treatment representative and maintenance personnel. Remote access features shall include, but not be limited to routine remote monitoring, relay adjustments, receiving alarms, data logging, and - in the case of condenser water treatment - biocide feed logging as it relates to JACHO standards and documenting proof of due diligence relative to Legionella control. Controllers shall also monitor various sensors (i.e., conductivity, pH, ORP, tank level, flow switch) as well as activate blowdown (via solenoid, actuator, motorized ball-valve) and chemical injection pumps as treatment programs deem necessary. Controllers shall be intrinsically safe and shall default to a state of maximum safety for the process system.

2.03 STEAM BOILER SYSTEM

A. Specific chemicals and equipment for the boiler system shall be determined by proposers based on raw water analysis required under Part 1 above.

B. Provide a three (3) liquid chemical component program for boiler scale control, boiler corrosion control, and steamline treatment/condensate line corrosion control. 1. Boiler scale control product shall be liquid and based on polymer dispersant chemistry. Steamline treatment shall be liquid and based on short, medium, and long reaching neutralizing amine chemistry; FDA approved where applicable (i.e., autoclaves, research or kitchen usage). Boiler corrosion control product shall be liquid and based on sulfite chemistry at a minimum. 2. Boiler scale control product shall be injected into each boiler or each feedwater line prior to each boiler. Boiler corrosion control product shall be injected into the deaerator. Steamline treatment shall be injected into the steam header. 3. The scale control, corrosion control, and steamline treatment products shall be programmed to feed based on feedwater rates or percent-time at the recommended mid- range dosage rates (refer to the chemicals' product bulletins). Cycles of concentration shall be determined based on makeup water chemistry.

C. Chemical feed systems: Equipment for each chemical product above shall have features that ensure drumless chemical delivery, chemical tank spill containment, chemical injection pump containment, chemical tubing containment, and minimal chemical exposure to maintenance personnel. 1. Self-contained chemical storage tank with at least 110% containment. Tank shall be stainless steel or polyethylene, and sized relative to the application and space allotted for chemical storage. Three (3) minimum required. 2. Chemical injection pump shall have speed and/or stroke control, and be rated for pressures associated with the boiler plant operation. Four (4) required. 3. Each chemical injection pump shall be mounted in its own NEMA-type containment cabinet/box with see-through Plexiglas door. Three (3) minimum required. 4. Each set of suction-side and discharge-side chemical tubing shall be fitted with schedule 80 and flexible PVC conduit for extra chemical containment. Containment runs shall be from chemical tank to pump box and from pump box to injection point, and shall be secured with hose clamps. Four (4) sets required.

D. Provide one (1) boiler water treatment controller unit consistent with that described in Section 2.02, A. Unit shall provide automatic continuous (i.e., surface) blowdown for each boiler. Unit shall monitor boiler water conductivity and activate blowdown based on pre-programmed set points. Unit shall control activation of each chemical injection pump. 1. Boiler water treatment control system shall consist of one (1) controller unit, two (2) conductivity sensor probes, two (2) throttling valves, two (2) motorized ball-valves, and one (1) tank level sensor for each boiler chemical tank proposed. 2. Provide a water sample cooler for each boiler that corresponds to the temperature/pressure of the boilers as supplied.

E. Corrosion Test Coupons: Provide corrosion coupon rack in condensate return piping at the deaerator/boiler feed unit to facilitate use of corrosion coupons. Provide one set of steel, brass, and copper coupons.

2.04 CONDENSER WATER SYSTEMS

A. Specific chemicals and equipment for the condenser water system shall be determined by proposer based on raw water analysis required under Part 1.

B. Provide an all liquid chemical product program for the control of mineral scale, corrosion, and biological fouling of the condenser water system. 1. Program shall be designed to operate condenser water at least 6-7 cycles of concentration to maximize water conservation. Sulfuric acid is not a desired method of water conservation. 2. Program will provide safety and drumless delivery features. 3. Program will utilize liquid products to include a scale and corrosion inhibitor, an oxidizing biocide, a non-oxidizing biocide (gluteraldehyde is not acceptable) or an antifoulant/dispersant, and pH control as necessary. 4. Chemical treatment shall address Legionella and microbiological control. As such, the oxidizing biocide shall be programmed to feed daily and hold a free oxidant residual of 0.5-2.0 ppm for at least a two (2) hour period. 5. The non-oxidizing biocide (gluteraldehyde is not acceptable) or antifoulant/dispersant shall be programmed to feed two (2) times per week at the recommended mid-range dosage rate (refer to the chemical's product bulletin). 6. The scale and corrosion inhibitor shall be programmed to feed based on blowdown, makeup, or percent-time at the recommended mid-range dosage rate (refer to the chemical's product bulletin).

C. Chemical feed systems: Equipment for each chemical product above shall have features that ensure drumless chemical delivery, chemical tank spill containment, chemical injection pump containment, chemical tubing containment and minimal chemical exposure to maintenance personnel. Three (3) or four (4) each of the following items will be required depending of if pH control is necessary or not. 1. Self-contained chemical storage tank with at least 110% containment. Tank shall be stainless steel, polyethylene, or other compatible material and sized relative to the application and space allotted for chemical storage. 2. Chemical injection pump shall have speed and/or stroke control, and be rated for pressures associated with the condenser water operation. 3. Each chemical injection pump shall be mounted in its own NEMA-type containment cabinet/box with see-through Plexiglas door. 4. Each set of suction-side and discharge-side chemical tubing shall be fitted with schedule 80 and flexible PVC conduit for extra chemical containment. Containment runs shall be from chemical tank to pump box and from pump box to injection point, and shall be secured with clamps.

5. Treatment chemicals shall inject into the condenser pipe header return-to-tower using a corporation stop(s) injection quill(s) as appropriate per product or service.

D. Provide one (1) condenser water treatment controller unit consistent with that described in Section 2.02, A. Unit shall provide automatic blowdown for the cooling tower. Unit shall monitor condenser water conductivity and activate blowdown based on pre-programmed set points. Unit shall control activation of each chemical injection pump. Unit shall monitor pH and ORP and activate chemical feeds based on pre-programmed set points and schedules. 1. Condenser water treatment control system shall consist of one (1) controller unit, one (1) conductivity sensor probe, one (1) pH sensor probe (if pH control is necessary), one (1) ORP sensor probe, one (1) flow switch, and one (1) tank level sensor for each condenser chemical tank proposed. 2. Bypass loop shall be made of 1-inch schedule 80 PVC and have PVC ball valves, water sample point, Y-strainer, sensor probes, chemical injection points, corrosion coupon rack, and a rotometer (i.e., flow meter). 3. One (1) blowdown solenoid shall be provided. 4. Two (2) water meters shall be provided for the makeup and blowdown water lines. Meters shall have dry electrical contacts, remote and/or readily accessible metering, and be approved/certified for evaporation credit usage by the local water utility. 5. A two (2) station corrosion coupon rack with mild steel and copper coupons shall be provided and installed in the bypass loop.

2.05 CHILLED WATER SYSTEMS

A. Provide and install a One Shot Feeder with funnel, an air release valve, sized for each system to be served (minimum size 5 gallons), rated for a minimum pressure of 300 psi. A non-nitrate (molybdate/TTA or other approved chemical) based program will be utilized for closed loop systems.

2.06 HOT WATER REHEAT SYSTEMS

A. Provide and install a One Shot Feeder with funnel, an air release valve, sized for each system to be served (minimum size 5 gallons), rated for a minimum pressure of 300 psi. A non-nitrate (molybdate/TTA or other approved chemical) based program will be utilized for closed loop systems.

2.07 DOMESTIC HOT WATER SYSTEM

A. Where water conditions require, provide and install such equipment and chemicals as necessary to control scale, erosion, and/or corrosion.

2.08 TEST CABINET, EQUIPMENT, TEST CHEMICALS, AND TRAINING

A. Provide a test cabinet, testing equipment, meters, reagents, test kits, chemicals, and training to place systems in operation and to effect the recommended water treatment and testing program.

PART 3 - EXECUTION

3.01 INSTALLATION

A. Install equipment furnished under Part 2 of this specification in locations set forth on the drawings.

B. Furnish and install the necessary piping, valves, fittings, etc., as necessary to place treatment and control equipment in operation.

C. The necessary hot-taps, piping, electrical, and tie-in connections shall be provided under the appropriate part of the construction contract. The General Contractor shall coordinate and effect these requirements.

D. Coordinate and schedule the services of the chemical water treatment and HVAC equipment provided for assistance as necessary to complete systems cleaning, flushing, boil out, start-up, treatment, and operation as is necessary, in accordance with the requirements of paragraphs below. Intent is that vendor coordinates activities with mechanical contractor such that mechanical and associated systems installed as part of the project are properly protected and in compliance with water treatment industry best practices at all times during the start-phase of the project.

E. The chemical water treatment system representative shall field verify the completed installation, including field calibration of controllers, pumps, and other operating parts. In addition, the representative shall insure that all necessary chemicals and test equipment is on hand when needed.

3.02 SYSTEM PREPARATION FOR OPERATION

A. Boiler System: 1. Comply with the requirements and instructions of boiler manufacturer and as specified in other sections.

B. Closed Water Systems: Chilled water and hot water reheat. 1. Initial Flushing: a. Remove loose dirt, mill scale, metal chips, weld beads, rust, and like deleterious substances without damage to any system components. b. Bypass factory equipment, unless acceptable means of protection are provided and by subsequent inspection of water boxes and other "hide out" areas takes place. Bypass loops and connections provided by General/Mechanical contractor. c. Isolate or protect "clean" system components including pumps and pressure vessels and any component that may be damaged. d. Open all valves, drains, vents, strainers and the like at all system levels. e. Remove plugs, caps, spool pieces and components to facilitate early discharge from system. f. Sectionalize system to obtain debris carrying velocity of 6 FPS if possible. g. Connect dead end supply and return headers and the like, as necessary or provide drains in dead end eccentric caps. h. Install temporary strainers where necessary to protect downstream equipment. i. Supply and remove "flushing" water and drainage by fire hoses, garden hoses, temporary or permanent piping, or system booster pumps. j. Flush for not less than 4 hours. k. Inspect system including any storage tanks and basins to determine if debris accumulation required dewatering and cleaning prior to the next phase. l. For systems indicated with glycol, fill system from pre-mixed tanker trucks or barrels at indicated concentrations. Handle glycol in accordance with manufacturer's instructions and regulatory requirements. 2. Cleaning: a. Remove adherent dirt (organic soil), oil, grease, hydrocarbons, welding and soldering flux, mill varnish, piping compounds rust (iron oxide), and like deleterious substances not removed in initial flushing without chemical or mechanical damage to any system component. b. Utilize defoamers to preclude damage to existing work and, specifically, adjacent electrical equipment.

c. Utilize heat to maximize effectiveness of compounds or use live steam injection where practical and safe. Do not raise cleaning water temperature in excess of 150 degrees F. d. Install temporary strainers, reinforced against blowout, sized to not impair equipment performance, to preclude passing of particles larger than 60% of smallest radial and at a minimum to retain all particles larger than 1000 microns. e. Permanent facility pumps shall not be used for circulating cleaning water, except in compliance with the following provisions: 1) System construction, flow rates and pressure are such that it is impractical for the Contractor to provide temporary pumps and construction procedures, initial flushing workmanship, and cleaning provisions. 2) Mechanical seal area of each pump stuffing box is continuously flushed, under head in excess of pump internal pressure, at a rate not less than 1/2 gpm with water passing through specified cyclones or a 5 micron filter if other than a protected potable water supply. 3) The guarantee on the entire pump assembly is unconditionally extended for two years after date of facility acceptance. Leakage from pump seals, scored horizontal turbine pump shafts with vibration in excess of two mils at shutoff head during that period, shall be construed as damage, requiring immediate rectification. f. Flush system per "flushing instructions". g. Next phase is to passivate metal surfaces. Add 5 lbs. (or as specified) per 1000 gallon system capacity. Circulate for 48 hours. Perform total soluble inorganic phosphate (TIP) tests (or equivalent product) to determine the passivating qualities and make adjustments accordingly. System shall not be on a heat load. Sixty to ninety degrees F is in preferable heat range. After passivation "flush" system and refill with potable Municipal water. h. Blowdown all strainers or remove and clean as frequently as possible during cleaning and passivating stages. i. Replace all filter elements as necessary. j. Prepare system for "final flushing" by displacing all cleaning and passivating solutions and installing primary filter elements in cleaned filter body. 3. Final Flushing: a. Return systems to conditions required by "Initial Flushing" after all cleaning and passivating solutions have been displaced by clean make-up disinfected water. b. Flush all dead ends and isolated "clean" equipment. c. Operate gently, all valves to dislodge any debris in valve body by throttling velocity. d. Flush for not less than 4 hours. 4. Placing into "Next Phase" Condition: a. Clean all "temporary" and permanent strainers. The water treatment supplier shall schedule removal of "temporary" strainers 3 months after final acceptance of facility, at a time approved by the Owner, unless directed otherwise by the Architect. b. Dewater and clean all sumps, basins, storage, and pressure vessels and the like. c. Disassemble, inspect, clean, repair, replace and re-assemble any critical component or questionable item. Any convoluted flexible connector left in place shall be removed and cleaned. d. Preliminarily adjust all control valves. e. Close-up and fill system within 8 hours to minimize corrosion of untreated surfaces. f. Charge system with next phase chemical treatment compound within guidelines recommended by water treatment vendor.

5. Chemical Treatment Compound: a. A liquid solution of borate/molybdate, TTA and anti-scalent product with an optional color concentration indicator shall be added to provide protection from corrosion, fouling. Product must contain a scale modifier with borate as the pH buffer. Additions shall be added at 1 gallon per 1000 gallons system capacity (or as required). Chemical levels shall be maintained at 100-200 ppm in chilled closed systems and 200-350 ppm in hot closed systems. Intent is not to use nitrite based corrosion inhibitors due to denitrifying bacteria issues.

3.03 OWNER OPERATOR TRAINING

A. Provide the maintenance personnel with a Program Administration Manual to include operating and maintenance instructions for all equipment furnished under this section, recommended chemical treatment and testing program, and any special safety information.

B. Instruct Owner's operating personnel in the requirements of the treatment and testing program. Provide all associated tools, meters, and test kits to effect the management of the water treatment program. Supply manuals, control parameters, and daily log sheets for the various systems covered under this section.

C. Provide initial training session limited to no more than 4-hours and two (2) follow up training sessions of 2-hours each - three (3) months and six (6) months after initial sessions.

D. Service representative shall provide service at the facility (at a minimum) on a bi-weekly basis during the first 12 months of building operations after substantial completion and monthly thereafter. Service representative shall be on site and participate in the water treatment requirements for start-up (and problem solving) of all boiler, condenser, and closed loop systems.

E. At each on site analysis, verbally consult with and advise appropriate maintenance personnel and mechanical sub-contractor of status of program and recommended changes. Follow the verbal consultation with a written report.

END OF SECTION

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