mdeq noncommunity water system workshop cross connection … · 2016-02-26 · power/steam cleaner...
TRANSCRIPT
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MDEQ Noncommunity Water System Workshop Cross Connection Control Training – Commercial and Industrial Facilities
Presented by : Glenn Adamus
Hydro Designs, Inc.
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NOT MY HOUSE…........I PROMISE
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HOORAY, I HAVE AN AIR GAP!….OOPS
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HOMEMADE GARDEN SPRAYER……..REALLY?!?!?!?!?
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Presentation Objectives
Quick Hints-Selecting the Right Backflow Preventer!
Type II Systems – Evaluating Water Supply and Internal Points of Use - Cross Connections
Help you Evaluate Cross Connections and Control Them
1
2
3
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• Experience • Solutions • Clients
Hydro Designs, Inc. 30 Years In Business
25,000 Annual CCC On-Site Surveys 250,000 Assemblies & Devices-Database Tracking
170 Municipal Clients
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How Do You Select the Proper Backflow Preventer to Protect Cross Connections? 1. Evaluate the substance that could backflow –
High/Health or Low Hazard? 2. Could backflow occur due to Backpressure or
Backsiphonage? 3. Is “Continuous Pressure” possible (Y/N)?
CRITICAL CONCEPT!
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Helpful Hints – Choosing Backflow Preventers
• Any device or assembly termed “vacuum breaker” may protect against high hazard
• Any device or assembly termed “check valve” may protect against low hazard only
• Vacuum breakers DO NOT protect against backpressure
CRITICAL CONCEPT!
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HIGH VS. LOW HAZARD Common Backflow Preventers
HIGH HAZARD • Reduced Pressure Backflow
Prevention Assembly (RPBP) • Pressure and Spill Resistant
Vacuum Breaker Assembly (PVB and SVB)
• All vacuum breaker devices • Air Gap
LOW HAZARD • Double Check Valve Assembly • Vented Dual Check Valve • Dual Check
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Typical Cross Connections – Commercial/Industrial Facilities
Chemically Treated Boilers Treated Water Systems Irrigation Systems Fire Protection Systems Heating/Cooling Systems Cleaning/Pressure Washer Operations Chemical Mixing Tanks
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Industry
• Water typically used for process water, boiler/heating, cooling and potable use • Many opportunities to create cross
connections • Identify common hazards and how to
protect them
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Containment
• High Hazard type facilities may require RPBP or AG as containment for protection of PWS • Type II system properties may require
“Containment” if multiple buildings supplied by same well
• Containment protects PWS - ONLY!
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Containment
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Containment - Parallel Installations
• Service line containment – may have bypass with equal protection
• Allows maintenance on one assembly while maintaining water to facility
• Bypass must have equal or greater protection
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Containment Bypass
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Cross Connection! Spool Piece Flange – Private Well/City Water
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Spool/Swing Connections
• Spool connections are not backflow preventers! • Swing connections are not backflow preventers!
• A RPBP may be required on community water supply!
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Swing Connection
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Water Storage Tank Considerations
• Some facilities have above ground storage tanks (AST’s) - need to evaluate in relation to
water supply arrangement/configuration
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Contained?
City Water Supply
Supply to AST
Supply to AST
From AST To Fire
Protection
From AST To Fire
Protection
Is this valve a backflow preventer?
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Above Ground Water Storage Tank-Considerations
• Verify air gap in water supply • Ensure air gap not bypassed
• Verify what water in tank is used for? • Is water treated or heated (steam coils?)
• Verify condition of tank
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Fire Protection Systems
• Often supplied directly by PWS and upstream of other building containment
• Fire Protection (FP) system may represent High Hazard or Low Hazard
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Fire Protection Systems • Evaluation of system may involve
consultation with PWS, fire marshal, facility, insurance companies, etc.
• FP systems have specific flow and pressure requirements
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Fire Protection System Types • Types of Systems
– Wet Pipe - system employing sprinklers attached to piping system-connected to water supply – backflow concern
– Dry Pipe - sprinklers attached to piping system containing air-release of air allows water to enter system through dry pipe valve
– Preaction - similar to Dry Pipe, supplemental detection system in same area as sprinklers
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Fire Protection System – International Plumbing Code (IPC)
• IPC 608.16.4 – Dry pipe and Preaction systems do not require isolation – Wet systems shall have the potable water supply
protected by either RPBP or DCV • IPC 608.16.4.1
– Chemical addition to FP system or connection to non-potable secondary water supply requires RPBP protection
– Chemical addition – RPBP may be used to isolate portion of FP system vs. entire FP system
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Pumps • Booster Pumps
– Used to supply high volumes of water – electric, diesel, or combination
– May be water cooled/glycol mix via single wall heat exchanger
• Jockey Pumps – Low volume, high pressure pump to maintain
elevated pressure in system – Supplied water from city/domestic or FP system
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Fire Protection Systems • What factors may increase hazard level with
Fire Protection Systems?
1. Chemical treatment to FP system 2. Presence/condition of above ground storage
tanks 3. Siamese/pumper and hydrant connection
locations 4. Fire Department – water source? 5. Evaluate Jockey and Booster Pumps
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Pumper Connection
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Hydrant/Pumper
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Double Check Valve Assembly - FP
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Industry
• Internal/Isolation Hazards
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Hose Connections
•Most common cross connection!
• IPC 608.15.4.2 Hose connections = “Sillcocks, hose bibbs, wall hydrants …with a hose connection shall be protected by an AVB or PVB or a permanently attached HBVB”
• 2 Exceptions – Hot water tank drains and residential clothes wash machines
•High hazard cross connection
•Continuous pressure and physical location will dictate type of protection
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Example – Antifrost Hose Bibb Vacuum Breaker (AFHBVB)
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Exterior Wall Hydrants/Hose Connection
• May not be approved to protect against backflow
• May need to install AFHBVB onto existing wall hydrant
• Hydrants may be ASSE 1019, 1052 or 1053
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Toilets •Approved Antisiphon Ballcock Assembly required (ASSE 1002)
•Critical level of device must be 1” above top of overflow tube
•High Hazard cross connection
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Anti-Siphon Ballcock Installation Requirements
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Urinals • Vacuum breaker critical level must be 6” above top of urinal
• Sanitizer connection point must be 6” below critical level of vacuum breaker
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Sloan Flush Valve – Fixture Vacuum Breaker
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Janitor Sinks • AVB required for threaded outlet to protect against
submerged inlet
• No valves/valved splitters downstream of AVB
• High Hazard cross connection
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Chemical Dispensing Systems
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Chemical / Soap Dispensers
• Only ASSE 1055 devices should be accepted • May be equipped with internal Air Gap • May be equipped with external Atmospheric
Vacuum Breakers or internal Hose Bibb Vacuum Breakers
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Inside ASSE 1055 Dispenser With Air Gap
?
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Dispenser With HBVB (ASSE 1011)
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Chemical / Soap Dispensers 1. May be supplied from a dedicated water supply:
– If this is the case and the dispenser is an approved ASSE 1055A device, no further action will be required
2. May be supplied from a mop sink faucet having an approved vacuum breaker:
– If this is the case and the dispenser is an approved ASSE 1055B device, the installation of a water wasting tee / side kick device will be required
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Water Treatment
• Water Softeners
• Reverse Osmosis
• Deionized Water
•Protection with RPBP on potable water makeup required if used for Non-Potable/Process Water
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Water Softeners
• Water softeners need to be regenerated using brine solution to continue to function
• Drain line from regenerating or backwashing of cycles from softener may pose a high hazard cross connection hazard!
• Submerged inlet may be created due to drain line connection to sanitary drain
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Water Softener Drain - Air Gap Required
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Heat Exchangers
• Steam heat exchangers used to produce domestic and process hot water
• “Double wall” and “single wall” tube versions separate water from steam/transfer fluid
• Steam flows through tubes/surrounded by water
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Heat Exchangers
• Steam may be source of contamination (additives) • IPC 608.16.3 requires use of double wall type for
domestic use if TOXIC additives used • Single wall shall be permitted for domestic use
with addition of only NON-TOXIC additives
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Heat Exchanger
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Boilers • Boiler is a closed system in which water is
heater under pressure • Hot water used for multiple purposes • Water may require treatment prior to boiler
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Boilers
• IPC 608.16.2 requires VDCV (ASSE 1012) in supply to non-treated boiler = low hazard
• Chemical treatment/conditioning chemicals added = high hazard cross connection – RPBP (ASSE 1013) required in water supply
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Untreated Boiler
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Untreated Boiler Supply
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Solar Hot Water System
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Geothermal Systems
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Cooling Towers
• Cooling towers cool condenser water–cooling systems – Water recirculated, chemicals may be added (corrosion
inhibitors, biocide)
• Potable water makeup is required as system water levels decrease
• High Hazard protection required on potable water supply due to chemicals, bacteria, vermin, etc.
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Cooling Tower
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Cooling Towers
• Air gap – effective cross connection control method • Air gap must be outside of enclosure
(contaminated water vapor) • RPBP - correct application under backpressure
conditions or if water makeup is inside cooling tower
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Cooling Towers
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Chilled Water Loop Makeup
Return Line-Water Makeup-protection
required?
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Lawn Irrigation Systems
• Water used to irrigate premises • Sprinkler heads may be exposed to
chemicals, environment • Potable water supply represents High Hazard
cross connection (chemicals, bacteria)
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Lawn Irrigation Systems
• IPC 608.16.5 - RPBP, PVB, AVB may be appropriate water supply protection
• PVB most commonly seen • Code requires that ANY chemical addition
requires RPBP in water supply • Pumps, injectors, pressurized tanks used for
introducing chemicals
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Lawn Irrigation System – Approved PVB Installation
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Power Washers
• Require water supply, a pump to pressurize the incoming water, a chemical aspirator to draw a cleaning chemical (soap) into the water stream and a wand to direct the water/chemical solution
• Water may be direct feed to pump, or supplied to holding tank – feeds pump
• Represents High Hazard cross connection
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Power Washers
• Direct feed to pump = Backpressure condition – RPBP required on supply!
• Direct feed to holding tank = Backsiphonage condition – inspect internal Air Gap/supply - install PVB in supply
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RPBP Supplying Power Washer
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Power/Steam Cleaner Holding Tank
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Valved Hoses/Reels • Very common for cleaning purposes • Garage areas, food processing areas, plant
floor cleaning • Represents a High Hazard cross connection –
Backsiphonage • RPBP, SVB or PVB appropriate
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Valved Hoses/Reels
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Food Establishment Hazards
• Water used extensively for food preparation and cleaning purposes
• Water used for beverage dispensers • Similar cross connections may be found as in
Industrial Facilities (Fire Protection, Boilers, Water Softeners, Lawn Irrigation, etc.).
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Typical Food Establishment Equipment Requiring An Air Gap
• Steam Kettles / Pot Fillers • Ice Machine Condenser Drains (Water Cooled) • Walk-In-Cooler Condenser Drains (Water Cooled) • Chemical / Soap Dispensers • Sinks/Dip Sinks • Dish Hand Sprayers • Water Softener and Filter Drain Lines • Coffee Machines
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Dish Hand Sprayer – Air Gap
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IPC Section 608.16.1
“The water supply connection to coffee machines and non-carbonated beverage dispensers shall be protected against backflow by a backflow preventer conforming to ASSE Standard 1022 or by air gap.”
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A.S.S.E. 1022 Typical Applications • Espresso Machines • Coffee Pots/Coffee Vending Machines • Ice Makers (with no internal air gap) • Juice Machine • Slushy/Slurpee Machine • Soda Fountain Carbonators
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ASSE 1022 Device (mfg by Watts)
ASSE 1022 Tag
New Style ASSE 1022 (mfg by Abco)
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Soda Fountain Carbonator
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Equipment Typically Requiring An Atmospheric Vacuum Breaker or Pressure Vacuum Breaker
• Garbage Disposals • Dishwashers • Chemical/Soap Dispensers • Garbage Can Washers • Mop Sinks • Hose Connections • Trough Urinals • Water Closets/Urinals With Sloan Type Flush Valves • Pasta Cookers and Rethermalizers
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Dishwasher AVB
Soap Dispenser AVB
Hand Sprayer
Garbage Disposal AVB
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Lab Faucets Lab faucets require AVB protection, or LFVB protection
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General Office/Commercial Typical Cross Connections
• Toilets • Urinals • Janitor Sinks • Hose bibbs • Cafeteria Equipment
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General Office/Commercial Typical Cross Connections
• Chemical Dispensers • Boilers • Cooling Towers • Irrigation • Fire Protection Systems
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School/College Typical Cross Connections
• Toilets • Urinals • Janitor Sinks • Hose bibbs • Cafeteria Equipment • Chemical Dispensers • Boilers • Labs • Pools
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School/College Typical Cross Connections
• Sterilizers and Autoclaves • Film Processing • Cooling Equipment • Irrigation • Fire Protection Systems
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You Make The Call!
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Double Detector Check Valve?
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?
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?
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Glenn Adamus Vice President - Operations Hydro Designs, Inc. 5700 Crooks Road, Ste. 100 Troy, MI 48098 800.690.6651 toll free Office: 248.250.5015 [email protected]