Transcript casing_filler_presentation

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Casing filling has become an important option in the corrosion protection industry.
Water or water vapor is present in most pipeline casings, making possible galvanic corrosion of
the carrier pipe.
A “water short” can occur through the water in the casing, allowing cathodic current to flow
through the water and onto the pipe in the casing.
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Under these circumstances, cathodic current is increased and the casing is sacrificed as well.
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Casing filler prevents this from occurring.
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In some instances the pipe may be shorted to the casing through a direct metal-to-metal contact
and filling the casing might correct this condition on some occasions.
In any case, it is difficult, if not impossible, to cathodically protect pipe in casing, so that filling
of the casing will protect the pipe from corrosion regardless of the circumstances.
When the casing is filled, corrosion that might have been occurring is prevented, cathodic
current to protect the pipeline in the casing may be reduced, and the sacrifice of the casing by
cathodic current flowing through casing water is halted.
Hot, liquefied casing filler material can, in some instances, penetrate corroded, scaly pipe to
allow a film of casing filler material to coat the shorted contact surfaces of the pipe and casing.
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TRENTON Fill-Coat #1 Casing Filler is a full-service, hot-installed casing filler
system for installation into pipeline casings.
Fill-Coat #1 is a petroleum-based corrosion preventative compound used to fill the
annulus of casings.
Fill-Coat #1 is delivered to the jobsite via Trenton’s 3,000 and 6,000 gallon tanker
trucks that are heated and insulated.
Fill-Coat #1 prevents corrosion by displacing water that is present in the casing
and by preventing water from re-entering through leaks in the seals or through
condensation.
Fill-Coat #1 is non-hazardous and environmentally friendly.
Installation of Fill-Coat #1 Casing Filler is an acceptable “other measure” under the
code requirements of the Department of Transportation. (Title 49 of CFR, Part 192,
Subpart I, Section 192.467, Paragraph C)
Fill-Coat #1 Casing Filler provides protection against corrosion for pipes in casings
and Trenton provides the service of installing the material.
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Trenton Fill-Coat #1 Casing Filler is installed as a heated liquid through one casing
vent until the casing void is filled and the filler material discharges out of the other
vent.
A minimum of two vent pipes are required, one at each end of the casing. Keep in
mind that vehicle access to both vents is necessary for best filling results.
2” to 4” diameter vents are required with at least 1-1/2” diameter holes cut into the
casing.
Trenton recommends that a vent be attached on top of the high end of the casing
and on the bottom of the low end of the casing.
The top vent should be positioned at the 12 o’clock position, and the bottom vent
should be positioned at the 6 o’clock position.
Whenever possible, place the vents approximately 12” from the ends of the casing.
Special attention should be paid to the placement of the casing spacers and end
seals in order to not obstruct the vent holes.
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Verify casing length, pipe wall thickness, average coating thickness,
and pipe and casing diameters.
Remove and inspect the end seals. Inadequate end seals are a
common cause of leaks inside casings. If necessary, replace with
Link-Seal® Modular Seals when the carrier pipe is centered or
Trenton Seal-Wrap End Seals when the carrier pipe is not centered.
If necessary, flush the casing to remove debris.
The casing end seals must be subjected to a 5 psi regulated air test.
Close one vent and pressure the other to 5 psi. Hold for 15 minutes
and remove pressure. If the seals fail the pressure test, replace or
modify them.
As a safety precaution and to aid in the end seal’s proper
performance, backfill the excavations around the ends of the casing.
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Verify casing length, pipe wall thickness, average coating thickness,
and pipe and casing diameters.
Install Link-Seal® Modular Seals when the carrier pipe is centered
or Trenton Seal-Wrap End Seals when the carrier pipe is not
centered.
The casing end seals must be subjected to a 5 psi regulated air
pressure test. Close one vent and pressure the other to 5 psi. Hold
for 15 minutes and remove pressure. If the seals fail the pressure test,
replace or modify them.
As a safety precaution and to aid in the end seal’s proper
performance, backfill the excavations around the ends of the casing.
2” – for up to 1,000 Gallons of Filler
3” – 1,001 to 2,500 Gallons of Filler
4” – for over 2,500 Gallons of Filler
The candy canes should be
removed on both casing vents
prior to the scheduled fill
date.
Install caps over the vent
pipes to prevent water from
entering the casing until the
scheduled fill date.
The contractor must test the
casing end seal integrity with
the required 5 psi air test. If
the end seals pass the air test,
you can backfill the ends of
the casing and schedule the
fill.
On the scheduled fill date, Trenton’s crew arrives in
their
50 foot heated and insulated tanker. The tanker is
positioned near the bottom casing vent on the fill side.
Using an air compressor,
Trenton technicians
perform an air flow
check by blowing air
across the casing from
the top vent to the bottom
vent at a maximum
pressure of 5 psi, to
ensure there is adequate
air flow between the
vents.
This process will also
remove any water that
might be present in the
casing.
Trenton technicians
check air flow
through the opposite
vent.
If there is adequate
air flow and there are
no obstructions, the
casing is ready to be
filled.
Prior to the installation of the casing filler, Trenton technicians
pour Pre-Con into the bottom vent at a ratio of 1 gallon per 200
gallons of filler. Pre-Con corrosion inhibitor added to the casing
neutralizes water in the casing and is part of Trenton’s patented
casing filling method. (Patent #4,469,469.)
Trenton technicians attach a compression fitting to the
bottom
vent on the fill side.
Trenton technicians attach a hose to the
compression fitting and Fill-Coat #1 is ready to be
pumped into the casing.
A meter registers the gallons installed and the progress of the
fill while a pressure gauge monitors the fill pressure.
Trenton technicians stay in constant communication with each
other throughout the fill process.
Fill-Coat #1 continues to
be installed until the
space between the
casing and the carrier
pipe is filled.
Looking through the top
casing vent, a Trenton
technician waits for the
casing filler to appear.
The fill process is normally completed when the
filler is discharged out of the top vent.
After being pumped into the casing, the casing filler
cools and becomes a firm gel.
The jobsite is cleaned up
and all surplus material is
returned to Trenton’s
facility.
Once the fill is complete,
the candy canes can be
welded back on the casing
vents.
CORROSION CONTROL PRODUCTS COMPANY
can supply you with Trenton Fill-Coat #1 Casing Filler and
Pipeline Seal and Insulator, Inc. Isolating Casing Spacers,
Link-Seals and End Seals for your installation requirements.
Visit our Website for More Information!
www.PipelineCasings.com