Descripción: NORMA ANSI B 56.6 QUE DESCRIBE CRITERIOS TÉCNICOS
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Extend the Service Life of Water Storage Tanks Reflecting the Revised AWWA D102 Standard
AWWA D102 D102 Purpose: • Sec. Sec. 1.1: 1.1: “The “The purpos purpose e of this this standa standard rd is to provide the m i n i m u m requirements requirements for coating steel water-storage tanks tanks including materials, coating systems, surface preparation, application, and inspection and testing.”
AWWA D102 Revision Task Force (RTF) • Revise and Update Existing Standard • Discuss changes to improve the Standard • Have a “3 year revision” goal
• Added 2 new coating systems in 2006 (ICS No . 4 & OCS No . 4 ) and Preconstruction Primer • Added new Exterior System in 2011: OCS No . 7 and r evised Interior System in 2011: ICS No . 3
Preconstruction Primer (2006) • Section 4.4.1.2 “… a fully compatible p r ec o n s t r u c t i o n p r i m e r may be shop applied. Most of these primers are formulated and tested for compatibility with the weld processes so that they may be applied edge to edge without weld margins … P rec o n s t r u c t i o n p r i m e r s used on interior surfaces … shall have been tested and certified for potable water contact in accordance with NSF / ANSI 61, Drinking Water System Components-Health Effects, by an ANSI-accredited laboratory.”
Performance Based Examples of Revisions – All proposed 2k exterior Polyurethanes meet minimum SSPC Guidelines (Paint 36 Level 1) for p e r f o r m a n c e - b a s e d Aliphatic Polyurethanes in Accelerated Weathering & Change of Color testing
OCS No. 4 - Z / U / Fl-Ur System • In 2006 AWWA D102 Revision Task Force has added a fluorourethane exterior coating system to the D102 Standard • OCS No. 4: Organic Zinc-Rich Primer Aliphatic Urethane Intermediate Fluoro-Urethane Topcoat
2.0 mils 3.0 mils 2.0 mils
Fluoro-Urethane • “This system provides gloss and color retention e xc ee d in g that of aliphatic polyurethane finish coats.” • “Applicators should be specifically trained in the application of the Fluorourethane topcoat.”
Good News: (sam e OZ & Ur)
Z/ U / Fl-Ur System: • OZ / Ur / Fl Ur
FluoroUrethane Gloss Retention
FluoroUrethane Color Retention
Steel Tank Exterior Service Life OCS No. 5 E/E/U
OCS No. 6 Z/E/U
Epoxy
Zinc
Intermediate
E
E
Topcoat
U
U
14 yrs*
yrs* 20
Primer
Service Life
* N ACE Corr osi on 2008 paper No. 08279
“Moderate” exterior environments
FluoroUrethanes • “Look good for a long, long time”. How long? Up to 30 years, depending upon application and tank location
• Why? The resins they contain have very high bond strength (internal) and resist deterioration from UV light sources
Interior Steel Tank Lining Service Life
Primer
ICS No. 1 E / E = 8.0 mils
ICS No. 2 E / E / E = 12 mils
E
E
Intermediate Topcoat Service Life
E E
E
12 yrs*
yrs* 18
* N ACE Corr osi on 2008 paper No. 08279 in p otable water @ AWWA DFT
ICS No.3 • In 2011 AWWA D102 Revision Task Group has changed ICS No. 3 to include a 100% solids epoxy with or without a primer! • ICS No. 3: Primer (Optional) 100% Solids Epoxy
1.0 mil 20.0 mils
2 2+ y e a r s e r v i c e l i f e N A C E C o r r o s i o n
2008 paper No. 08279“Moderate” exterior environments
ICS No. 3 •
This is a one or two-coat system, consisting of an optional two-component epoxy primer, inorganic zinc rich primer, or organic zinc-rich primer and a high solids two-component epoxy topcoat. ”
ICS No. 4 - Urea / Urethane System • In 2006 AWWA D102 Revision Task Group has added an “elastomeric” interior coating system to the D102 (Tank) Standard • ICS No. 4: Primer (Optional) P / PU / Hybrid
25.0 mils
ICS No. 4 • “This is a single coat, thick film, 100 percent solids coating based on urea/ urethane chemistry. This material provides increased film build, particularly designed to handle pitted or deteriorated steel. The thick film properties allow flexing over bolted or irregular weld seams.” • “Applicators should be specifically trained in the application of this system.”
Eliminate Rusting on Weld Seams:
100% Polyurea/Polyurethane • “Remain durable for a long, long time”. How long? Up to 30 years, depending upon application and tank location
• Why? The resins from which they are made remain flexible and resist impact and “ice-gouging”
Other Coating Enhancements to Achieve Longer Service Life
Common Areas of Corrosion What can be done to help stop this from happening again?
LV
Traditional Holiday Detection Equipment HV
After Coating is Cured & Solvent Free Cannot Detect Low Film Build
Fluorescing Pigment Technology
Fluorescing Pigment Technology
Fluorescing Pigment Technology
Areas highlighted show incomplete coverage of topcoat
