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Presented by Kelly Baker, Zerust Oil & GasNorthern Technologies International Corporation, USA 1
Albany, NYNov. 3, 2015
Vapor Corrosion Inhibitors for
UST Piping Sumps
AGENDA
• Introduction
• What are VCIs
• Industry Applications
• Tank Floors – Several Options
• Tank Roofs
• Pipelines
• Intro to Ethanol Corrosion
• Questions
2
3
Definition - VCI
Also referred to as Volatile Corrosion Inhibitors
o A class of chemical corrosion inhibiting compounds which have vapor pressures higher than that of air.
o This results in the release of vapor molecules of inhibitor into the air.
Vapor Corrosion Inhibitors
Definition Con’t
4
VCI molecules fill space and deposit on all
surfaces.
• Can work for immersed surfaces
• Not a ‘coating’
• Does not change the metallurgy
• Not permanent
• Can be painted/welded
• Non-toxic
• Can be designed for the service
Not “NEW” Technology
5
Environmentally friendly
Requires no cleaning prior to assembly
VCIs have been sold through major retailers for years
Several ‘consumer market’ products you can try
6
• Lowes
• Cabellas
•Flambeau
•Kobalt
•…others
Corrosion cannot be eliminated, it’s mechanism can only be
slowed down
Failure “prevention” provides a better return on investment than
failure “management”
Applications!
How are VCIsUsed in
Other Markets?
Low Temperature Flanges.
9
• Proprietary dual layer plastic film
• Impregnated with a VCI to enclose flanges, bolts and weld joints
• Average 2+ year life.
Long Term Corrosion Protection
10
Vapor CapsulesNumerous applications
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Protection of Electrical & Electronic Control Panels and Safety Switch Boxes
Spray-GNumerous applications
12
Applications!
Underground Storage Tanks!
(UST’s)
14
UST System Components
UST Sump
15
UST System Components
16
+
=
Ethanol Vapors
Water
Acetic Acid+
Bacteria
UST Environment Chemistry
17
Ethanol Vapors
Loose Connections?
18
Moisture Vapors
Ethanol Vapors
Contamination
19
Chemical Reaction
20
Aggressive Corrosion
Results!
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February 20, 2014
December 5, 2013
No Inhibitor
22
December 5, 2013 January 16, 2014
42 Days
Coupon Trial
23
Non-Spark
Non-Spark
Step 1
26
Rejuvenate Sump Saver
Periodic Replenishment
27
UST System Components
35 days
28
New Developments
29
UST Test Sumps – Feb 2015
Starter Kit Phase
UST Sump - Conclusions
1. Acetic Acid can form in the sumps, due to
Ethanol vapors, bacteria and moisture.
2. Absence of any of the three seems to result in
a much lower corrosion rate.
3. Vapor Corrosion Inhibitors can reduce
corrosion rates.
4. Sump condition is a factor in the effectiveness
of the VCI.
5. Tests are nearing completion.31
Thank you!
Questions?
32
Kelly Baker
kbaker@ntic.com
832-465-5668
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