soil to air transition corrosion - nace tx/la gulf section to air transition: the soil to air...
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SOIL TO AIR TRANSITIONSCorrosion and Mitigation
PRESENTER: RON RAPHOON
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WHAT WE ARE TALKING ABOUT
Soil to Air Transition: The Soil to Air Interface is the area above and
below the natural ground level where corrosion is most likely to
occur. It is an area greatly affected by moisture levels, certain
bacteria, temperatures, oxygen levels and pH levels. An increase
in corrosion can also occur if this area is exposed to agricultural
fertilizers, animal excrement and any chemicals with excessive pH levels.
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PROTECT OR REPLACE!
TITLE 49 §193.2625 CORROSION PROTECTION.
(a) Each operator shall determine which metallic components could,
unless corrosion is controlled, have their integrity or reliability adversely
affected by external, internal, or atmospheric corrosion during their
intended service life.
(b) Components whose integrity or reliability could be adversely affected
by corrosion must be either—
(1) Protected from corrosion in accordance with §§193.2627 through
193.2635, as applicable; or
(2) Inspected and replaced under a program of scheduled
maintenance in accordance with procedures established under
§193.2605.
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COATING IS REQUIRED!
TITLE 49 §195.581 Subpart H—Corrosion Control
Which pipelines must I protect against atmospheric corrosion
(a) You MUST coat each pipeline or portion of pipeline that is exposed to the
atmosphere Except section (c)
WITH
(b) Coating material suitable for the prevention of atmospheric corrosion.
(c) Except portions of pipelines in offshore splash zones or soil-to-air interfaces,
you need not protect against atmospheric corrosion any pipeline for which
you demonstrate by test, investigation, or experience appropriate to the
environment of the pipeline that corrosion will—
(1) Only be a light surface oxide; or
(2) Not affect the safe operation of the pipeline before the next
scheduled inspection.
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(a) Each buried or submerged component that is subject to external
corrosive attack must be protected from external corrosion by—
(1) Material that doesn’t corrode
OR
(i) An external protective coating designed to meet §192.461
AND
(ii) A cathodic protection system designed to protect components in
their entirety
CP TOO!
TITLE 49 §193.2629 EXTERNAL CORROSION CONTROL
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Buried or submerged pipelines installed after July 31, 1971
(a) must be protected against external corrosion, including the
following:
(1) It must have an external protective coating meeting the
requirements of §192.461
(2) It must have a cathodic protection system designed to protect
the pipeline in accordance with this subpart, installed and placed
in operation within 1 year after completion of construction.
THIS ISN’T A NEW PRACTICE
TITLE 49 §192.455 EXTERNAL CORROSION CONTROL
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(a) Each external protective coating, whether conductive or insulating,
applied for the purpose of external corrosion control must—
(1) Be applied on a properly prepared surface;
(2) Have sufficient adhesion to the metal surface to effectively resist
underfilm migration of moisture;
(3) Be sufficiently ductile to resist cracking;
(4) Have sufficient strength to resist damage due to handling and soil
stress; and
(5) Have properties compatible with any supplemental cathodic
protection.
TITLE 49: §192.461 EXTERNAL CORROSION
PROTECTIVE COATING
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FRESHLY COATED TO PREVENT
CORROSION
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WHAT CORROSION?
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LOSS OF WALL THICKNESS
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CRACKING
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DISBONDMENT
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COATING SOLUTIONS
A. Epoxy
A. FBE
B. 2-Part
B. Heat Shrink Sleeves
C. Wax Tape
D. Composite Repair Systems
E. UV Stable Tapes
F. Fiberglass/ Tape Combination
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EPOXY – FBE OR 2-PART
Abrasion +
Adhesion +
CP Friendly +
Flexibility –
In Service FBE – 2part +
Tapered Finish +
UV Stable –
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HEAT SHRINK SLEEVES
Abrasion +
Adhesion +
CP Friendly +
Flexibility –
In Service –
Tapered Finish +
UV Stable –
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WAX TAPE
Abrasion -
Adhesion -
CP Friendly ?
Flexibility +
In Service +
Tapered Finish +
UV Stable +
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COMPOSITE REPAIR SYSTEMS
Abrasion +
Adhesion +
CP Friendly –
Flexibility –
In Service +
Tapered Finish –
UV Stable +/–
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SOLID FILM BACKED TAPES
Abrasion –
Adhesion +/–
CP Friendly –
Flexibility +
In Service +
Tapered Finish +
UV Stable +
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FIBERGLASS POLYURETHANE WRAP
Abrasion +
Adhesion +
CP Friendly +
Flexibility +/–
In Service +
Tapered Finish +
UV Stable +
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ITS COATED, NOW WHAT?
What does the code require?
Conduct Inspections every 3 years and monitor
Recommend yearly checks during annual leak surveys
What does the IURC expect?
For those that use consultants, review their submitted documentation for
any remedial action items. Remedial action is to take place
within one year from the time of discovery
What are we seeing?
The soil‐to‐air interface needs more attention. Disbonded coating can
hold water next to the pipe and cause severe rusting and delaminating
of the steel.
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RD-6
Field Joint Coating