certification of water main rehabilitation products (ceam
TRANSCRIPT
Certification of Water Main RehabilitationProducts
Dave PurkissNSF International
Water Main Rehabilitation Products
• Product Types• Product Standards• Certification Process• Verification of Certifications
Water Main Rehabilitation Product Types
• Sliplining• Cured-In-Place (CIP)• Spray Applied• Replacement
Sliplining
• Pulling a new pipe into existing main.• HDPE most common.• Access pits are needed.
– Valves and tees removed.• Fold and form systems.
– PE tubing folded into C or U shape.– Pulled through pipe.– Reformed with a plug and/or steam or hot
water.
Sliplining
Standard Specifications for PE pipe– NSF Standard 14 – umbrella standard– NSF Standard 61 – material health effects– AWWA C901, C906 – water main and service
connection applications.Advantages
– Provides structural support.– Ends corrosion issues.
Disadvantages– Reduces pipe diameter and capacity.– Inability to negotiate elbows, many access pits
required.
Cured-In-Place
Liners• Hose or bag type.• Impermeable plastics membrane on one side. • Impregnated with epoxy or vinyl ester resins on
the other side.
Application• Inverted into water main using cold water.• Hot water or steam used to cure the
thermosetting material.
Cured-In-Place
Standard Specifications– NSF Standard 61 – material health effects.– ASTM F1216 – CIP applications.– ASTM F1743 – CIP applications.
Advantages– Can negotiate bends.– Structural, semi-structural, non-structural
options.Disadvantages
– Access pits are stilled needed for tees and valves.
Spray Applied
Materials• Cement mortar – 12-24 hour cure time.• Epoxy – 8 to 24 hour cure time.• Polyurethane – 30 minute cure time.• Polyurea??? – 1 minute cure time.Application• Rigs utilize rotating spray heads and most have
CCTV for follow-up inspection.
Spray Applied
Standard Specifications– NSF Standard 61 – material health effects.– AWWA C602 - cement mortar lining.
Advantages– Can negotiate bends.– Semi-structural, and non-structural options.
Disadvantages– Need to completely clean and dewater pipe
before application.– Access pits are stilled needed for tees and
valves.– Not fully structural.
Replacement
Materials• Ductile iron.• HDPE.• PVC.Applications• Excavation .• Pipe bursting.• Horizontal Directional Drilling.
Replacement
Standard Specifications– NSF Standard 61 – material health effects.– Ductile Iron
• AWWA C100 series – product specs.• AWWA C600 – installation specs..
– PVC• NSF 14 – umbrella standard.• AWWA C900, C905, C909 – water main apps.
– HDPE• NSF 14 – umbrella standard.• AWWA C901, C906 – water main apps.
Replacement
Advantages– Only choice if upsizing diameter/capacity is
needed.– Best choice if there are a lot of bends, tees,
valves that would require excavation anyway.– Limited down time if laid parallel.
Disadvantages– Excavation disruption.
Standards
• NSF/ANSI Standard 61 – Drinking Water System Components – Health Effects
• NSF/ANSI Standard 14 – Plastics Piping Systems Components and Related Materials
• ASTM F1216 – Standard Practice for Rehabilitation of Existing Pipelines and Conduits by the Inversion and Curing of a Resin-Impregnated Tube
• ASTM F1743 – Standard Practice for Rehabilitation of Existing Pipelines and Conduits by Pulled-in-Place Installation of Cured-in-Place Thermosetting Resin Pipe (CIPP)
Standards
• AWWA C602 – cement mortar lining of pipes.• AWWA C100 series – product specifications for
ductile iron pipe.• AWWA C600 – installation standard for ductile
iron pipe.• AWWA C900 series – product specifications for
plastic pipe/fittings.• AWWA C 605 – installation standard for PVC
pipe.
Product Certification
• Inspection of manufacturing facility.
• Collection of samples representative of production.
• Testing of products to applicable standards.
• Products can be certified if they meet the requirements of the standards.
• Ongoing annual inspections of manufacturing facility and retesting of products to verify compliance with applicable standards.
NSF/ANSI 61Drinking Water System Components– Health Effects
What it is …
• American National Standard
• Covers health effects of products used in drinking water applications
• Covers all products with drinking water contact from source to tap
NSF/ANSI 61 – 2004
Drinking water system components ― Health effects
NSF International Standard/ American National Standard
Developed by a consortium of: • NSF International • The American Water Works Association Research Foundation • The Association of State Drinking Water Administrators • The American Water Works Association
With support from: • The U.S. Environmental Protection Agency
under cooperative agreement #CR-812144
NSF
/AN
SI 6
1 –
2004
NSF/ANSI 61Drinking Water System Components– Health Effects
What does it cover …
• Pipes and fittings• Paints and coatings• Process media• Mechanical devices
– process equipment– water meters, valves
NSF/ANSI 61 – 2004
Drinking water system components ― Health effects
NSF International Standard/ American National Standard
Developed by a consortium of: • NSF International • The American Water Works Association Research Foundation • The Association of State Drinking Water Administrators • The American Water Works Association
With support from: • The U.S. Environmental Protection Agency
under cooperative agreement #CR-812144
NSF
/AN
SI 6
1 –
2004
• Joining & sealing materials
• Endpoint devices– faucets,– drinking fountains
NSF/ANSI 61Drinking Water System Components– Health Effects
What it is …
• Does not evaluate product performance.
• Evaluates the amount of any contaminant added from a product to drinking water against health based criteria.
NSF/ANSI 61 – 2004
Drinking water system components ― Health effects
NSF International Standard/ American National Standard
Developed by a consortium of: • NSF International • The American Water Works Association Research Foundation • The Association of State Drinking Water Administrators • The American Water Works Association
With support from: • The U.S. Environmental Protection Agency
under cooperative agreement #CR-812144
NSF
/AN
SI 6
1 –
2004
Regulation of municipal products(water treatment plant to building)
• 44 states currently require NSF 61compliance by policy, regulation, or legislation.
• 40 states require ANSI accredited certifiers
• ANSI = American National Standards Institute
• Compliance depends on bid specifications requiring NSF 61.
Certification Process NSF Standard 61
1. Application– for each plant
producing final product
2. Product information:– A list of all water contact components in a
product.– A list of all materials in a water contact
component.– A list of all chemical ingredients in a material.– The manufacturing process.– A list of known or suspected impurities– A Certificate of Analysis for metal alloys/mined
products.– Product Use Instructions
Certification Process NSF Standard 61
3. Formulation Review– Review of product formulation to determine what contaminants may be added to drinking water.–Development of a test plan for product/material.
Certification Process NSF Standard 61
4. Inspection of Manufacturing Facility– Verification of components/materials/ingredients
and supplier sources.– Tour of plant location.– Review of product labeling.– Review of production records.– Review quality assurance processes. – Collect samples for testing.
Certification Process NSF Standard 61
5. Laboratory TestingProducts exposed to formulated exposure waters (pH5, 8, 10)Exposure sequences vary:16 hours for cured-in-place and spray apps. 17 days for pipe and fittings.
Certification Process NSF Standard 61
5. Laboratory TestingMulti-day exposures typically havewater change each day.Last 16 hour overnight sample is sampled and analyzed.
Metals: Sb,As,Ba,Be,Cd,Cr,Cu,Pb,Hg,Se, Tl, Ni, Zn, Bi.Nonmetal: formulation dependent.
Certification Process NSF Standard 61
5. Laboratory Testingformulation dependent examples:Epoxy Coatings: GC/MS, bisphenol A and derivatives, epichlorohydrin, VOCs, solvent and reactant additives Portland Cements: dioxins and furans, radionuclides, glycols, ethanolamines, 54 metals.Polyethylene Pipe: GC/MS, VOCs, regulated metals.Polyvinyl Chloride: GC/MS, VOCs, regulated metals, residual vinyl chloride monomer.
Certification Process NSF Standard 61
Product exposure types
“in-vessel” “in-product”
Care is taken to only expose normally wetted surfaces
Exposure controls used throughout the exposure process
Epoxy coating evaluated for immediate return to service use:
-Coating is applied to glass slides, flushed, conditioned and cured per mfrs instructions.
-Slides exposed at pH 5, pH 8 and pH 10.
-16 hour exposure water analyzed for contaminants.
6. Toxicology EvaluationNormalization - Contaminant concentrations are calculated to reflect in-the-field (at-the-tap) exposure levels
Normalized concentration is compared to pass/fail criteria of the standard
Certification Process NSF Standard 61
Normalization Example•Epoxy coating exposed on glass slide at 122 sq inches per liter.•Designed for 4 inch diameter pipe and greater. 4 in pipe = 61 sq in/liter.•Lab Concentration of Bisphenol A = 15 ppb.•Normalized result =15 ppb x (61 sq in/liter)/(122 sq in/liter) = 7.5 ppb•Pass/Fail criteria for Bisphenol A = 10 ppb.
Certification Process NSF Standard 61
NSF/ANSI 61Drinking Water System Components– Health Effects
Acceptance criteria …Regulated contaminants:Includes USEPA and Health Canada regulated contaminants and EPA’s health advisories.
Non-regulated contaminants:More than 600 risk values have been set by NSF to address leaching of chemicals from materials that contact drinking water. Utilizing Annex A Toxicology Review and Evaluation Procedures.
NSF/ANSI 61 – 2004
Drinking water system components ― Health effects
NSF International Standard/ American National Standard
Developed by a consortium of: • NSF International • The American Water Works Association Research Foundation • The Association of State Drinking Water Administrators • The American Water Works Association
With support from: • The U.S. Environmental Protection Agency
under cooperative agreement #CR-812144
NSF
/AN
SI 6
1 –
2004
7. Listing and Certification– Products that meet the requirements of the
standard are Certified by NSF and entitled to bear the NSF Mark
– Certified products appear in NSF Listings– NSF Listings are available on the Internet at:
www.nsf.org
Certification Process NSF Standard 61
7. Maintenance of Certification– Manufacturing facilities are inspected at least
once per year.– Products are tested once per year.
Certification Process NSF Standard 61
• Products are Listed and de-Listed every day.• Verify that products are indeed certified to the
appropriate standards.
– Certified products appear in NSF Listings at www.nsf.orgOther piping product certifiers– Underwriters Laboratories
www.ul.com– Canadian Standards Association
www.csa-international.org
Verification of Certifications
