Memorial Hermann Best Practices
July, 2013
SECTION 22 67 13 PURIFIED WATER SYSTEM AND PIPING
PART 1 - GENERAL
1.01 WORK INCLUDED
A. Labor, materials, tools, equipment, and services for distilled and deionized water piping system, as indicated on drawings.
1.02 QUALITY ASSURANCE
A. Standard for sterilization: AWWA C601.
1.03 SUBMITTALS
A. Submit product for owner approval for water purification equipment. Submittal data required for piping, fittings, support, etc.
B. Submit test reports to Owner at completion of job.
1. Pressure tests.
2. Sterilization tests.
PART 2 - PRODUCTS
2.01 GENERAL
A. Acceptable manufacturers:
1. As indicated for individual items.
2.02 VALVES
A. All valves: Rated for 125 PSIG working pressure, non-shock.
1. Polyvinylidene Fluoride (PVDF): Valves will be manufactured from virgin unpigmented PVDF (Polyvinylidene fluoride) to be fully compatible with high purity PVDF system. All valves test to 150 psi @ 73°F. Acceptable manufacturer: Orion, George Fisher, Enfield.
2. Polypropylene valves: Valves will be manufactured from virgin unpigmented Type I homopolymer polypropylene to be fully compatible with the pipe material. Acceptable manufacturer: IPEX (Enfield), Orion, George Fisher
B. Shut-off valves: Ball type, socket or threaded ends, and Teflon seating.
C. Check valves: Ball type for either vertical or horizontal mounting, with threaded or socket ends.
D. Provide reduced pressure backflow preventer in piping serving equipment producing distilled or deionized water.
2.03 PIPE AND FITTINGS
A. Deionized water piping:
1. Polyvinylidene Fluoride (PVDF) pipe and fittings: Schedule 80, iron pipe dimensions, from virgin, unpigmented PVDF (polyvinylidene fluoride) resin, meeting ASTM D3222, using no plasticizers or pigments. Meet all dimensional tolerances of ASTM D2447. Fittings: Join by using the socket fusion method, conforming to ASTM 2657.
2. Polypropylene pipe and fittings: Schedule 80 iron pipe dimensions from virgin unpigmented, Type I homopolymer polypropylene, meeting ASTM D4101, using no plasticizers or antioxidants. Meet the dimensional tolerances of ASTM D2447. Manufacture fittings for joining by the socket fusion heat method, conforming to ASTM D2657. Acceptable manufacturers: Orion, George Fisher
2.04 LABORATORY WATER PURIFICATION SYSTEM
A. Acceptable manufacturers: Culligan, Mueller, Barnstead, Millipore, Permutit, Hydro.
1. Specification based on Culligan Aqua-Summa Model 32.
B. Description: Reagent grade water conditioning system to produce minimum 10 megohm resistance water. Equipment to be fully assembled; housed in single cabinet except for prefilter and water reservoir tank. System to include the following:
1. Prefilter: Replaceable element of polypropylene fiber with nominal rating of 5 micrometers.
2. Solenoid valve: Connected to feed water line to turn off feedwater when unit is not operating.
3. Pressurizing pump: 1/4 hp; 200 psig operating pressure; bronze rotary vane positive displacement pump.
a. Acceptable Manufacturer: Enfield, Orion, GSR.
4. Back pressure regulating valve.
5. Waste control valve to maintain proper recovery ratio of waste to feed water flow.
6. Reverse osmosis membrane assembly: Spiral wound modular configuration; cellulose acetate formamide material capable of producing water at least 90 percent free of dissolved solids at a feed concentration of 1500 ppm NACI at 14 bar and 25 degree C.
7. Water reservoir: 13.2 GAL capacity polyethylene plastic. Store reverse osmosis product water. Include diaphragm operated level control system to start pressurizing pump at low level and deactivate the RO system at high level.
8. Carbon filter: Cartridge type.
9. Deionizer: Exchange type; tank of fiberglass designed for 100 psi working pressure. Tank to hold mixed resin bed having 2500 grains capacity.
10. Polishing filter: 0.2 micrometer absolute.
11. Water quality monitor: Specific resistance monitor located on front panel; 4 IN scale with range of 0.5 to 18 megohms. Sensing cell positioned to monitor water quality after treatment by all stages.
12. Recirculation pump: Arranged to maintain water quality thru the carbon filter, deionizer, microfilter and monitor. Controlled by on-off switch to disable during periods of no use.
13. Frame support to mount components.
14. Cabinet: Designed for easy access to all components.
2.05 CENTRAL PROCESSING WATER PURIFICATION SYSTEM
A. Acceptable manufacturers: Bob J. Johnson & Assoc., Inc., Lakeside Water Treatment, Unity Equipment Systems, and Water Equipment Technology or approved equivalent.
1. Specification based on Bob J. Johnson & Assoc., Inc.
B. Description: Class III NCCLS grade water purification system to produce minimum 50,000 ohms resistance water. Equipment to be skid mounted, pre-piped, and pre-wired except for water reservoir tank. System to include the following:
1. Prefilter: Unity model AC9F075 activated carbon filter with timer based automatic back flush control.
2. Tanks constructed of steel; 100 psi working pressure; internal vinyl liner. All fittings plated for corrosion resistance. Tank diameter to be 9 IN.
3. Solenoid valve: Connected to feed water line to turn off feedwater to RO system when unit is not operating.
4. Back pressure-regulating valve to be located on return line to storage tank.
5. Waste control valve to maintain proper recovery ratio of waste to feed water flow.
6. Reverse osmosis membrane assembly: Spiral wound modular configuration; thin film composite material in FRP pressure vessels capable of producing a minimum of 600 gpd water at least 95 percent free of dissolved solids at a feed concentration of 1500 ppm NACI at 14 bar and 25 degree C. Include stainless steel pump, TDS monitor, 5 micron prefilter, low pressure protection, pretreatment lock out, pre and post flush, automatic restart from low pressure shutdown, reject recirculation loop, product and reject flow indicators, feed and product water sample ports, and product water check valve.
7. Water reservoir: 165 Gal capacity polyethylene plastic tank with polypropylene bulk head fittings to store reverse osmosis product water. Include three (3) point level control system to be supplied by RO manufacturer to start RO system at low level, stop recirculation pumps at low-low level, and deactivate the RO system at high level. Include hydrophobic HEPA filter for air vent rated for 0.2 microns.
8. Ultraviolet light sterilizer: Include intensity monitor, lamp out alert, elapsed time indicator, and manual wiper system. Size system to recirculation flow rate at 30,000 mWsec/cm2.
9. Polishing filter: 0.2 micron absolute cartridges housed in stainless steel filter housing. Filter capacity shall be in accordance with the recirculation flow rate at 3 gpm per 10" equivalent cartridge.
10. Water quality monitor: Specific conductance monitor located on front panel of control panel; 4 IN scale with range of 1-100 micromhos. Sensing cell positioned to monitor water quality after treatment by all stages.
11. Recirculation pumps (2): Arranged to maintain water quality thru the ultraviolet sterilizer, microfilter and monitor with alternating recirculation pumps per schedule. Pumps shall be 100% redundant, 316 stainless steel multi-stage centrifugal type with HQQE mechanical seal, and TEFC motor. Controlled by NEMA 4X rated control panel with HOA switches, run lights, and electrical disconnect.
12. Frame support to mount components.
2.06 OWNER FURNISHED POINT OF USE RO SYSTEM
1. Skid: Designed for easy access to all components.
A. Install in accordance with manufacturer's recommendations.
B. Connect storage tank with RO unit using polypropylene pipe approved for use by RO unit manufacturer.
C. Indirect waste from unit to sink or funnel drain.
PART 3 - EXECUTION
3.01 PIPING INSTALLATION
A. Install and hang piping as required by manufacturer's recommendations.
B. Install piping to provide every fixture and item of equipment requiring deionized water with suitable supply connection. No piping dead legs in entire piping distribution system.
C. Consult manufacturer's data and large scale details of rooms containing plumbing fixtures on architectural drawings before roughing in piping. Plug or cap piping immediately after installation.
D. Connect equipment furnished by others in accordance with Section 22 05 00.
1. For each water supply piping connection to equipment by others, furnish and install a Tru-union and a gate or angle valve. Provide a stop valve at each sink water supply. Minimum line size 1/2 inch.
2. Cap and protect until such time as installation is performed.
E. Furnish and install wiring and conduit under Division 26.
3.02 STERILIZATION OF SYSTEMS
A. Sterilize system as indicated, or in accordance with AWWA C601.
B. Thoroughly flush system.
C. After flushing, introduce chlorine or chlorine compound into system with dosage sufficient to give an initial residual chlorine content of 50 ppm.
D. Collect samples from various taps and fixtures throughout buildings during introduction of chlorine to assure uniform distribution. Open and close valves several times.
E. After 24-hour contact period, flush all traces of heavily chlorinated water from systems.
F. After flushing is complete, provide evidence of effectiveness of disinfection by filing with Engineer and owner's representative, laboratory reports of bacteriological tests on samples taken from system at each faucet and piece of equipment.
G. If satisfactory results are not obtained, repeat above disinfection process until satisfactory results are obtained.
H. Do not put system into service until satisfactory tests are reviewed by Architect and Project Engineer.
3.03 TESTING
A. Do not insulate, conceal or furr in pipe until it has been tested to satisfaction of Architect.
B. Upon completion of a section of system, test hydrostatically to pressure not less than 50 percent in excess of maximum pressure to which pipe will ordinarily be subjected, but in no case less than 100 PSI.
C. If test shows defects, replace such defective work or material and repeat tests.
1. Make repair to piping with new material.
2. No caulking of screwed joints or holes will be acceptable.
END OF SECTION
PURIFIED WATER SYSTEM & PIPING
22 67 13 - Page 4