piping leakages and treatment
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Problems at Pipe Supports
Causes & Prevention
By Anoop Nimkande(P91107)
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The Pipe Support Problem Corrosion at Pipe
Supports is a
leading cause of
external
corrosion
failures on above
ground piping
systems ..
Why ???
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Poor Designs & Misconceptions Poor Designs
Form Crevice
Trap Water
Hold Water
Hard to Inspect
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Poor Designs & Misconceptions
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Poor Design & Misconceptions Misconceptions
Rubber Helps
Its critical to
eliminate metal to
metal contact
Its a Galvanic
Thing
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What Really Goes Wrong?1. Water Gets In
2. Water Stays In
3. Paint Fails
4. Pipe Pits Through
5. Pipe Leaks
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What Goes Wrong?
PipeAtmosphericPipe Coating
Atmospheric CREVICEStructural Coating
SupportStructure
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What Goes Wrong?
Atmospheric
Pipe Coating Water
EntrapmentAtmospheric
Structural Coating
AtmosphericCoating
.
Immersion
Service
.
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What Goes Wrong?
Atmospheric
Pipe Coating
Atmospheric
Structural Coating
Bare Steel
Exposed to
OxygenatedWater
Atmospheric
Coating
.Softens -
Fails
.
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What Goes Wrong?
LocalizedWall Loss &Progressive
Undercuttingof Paint
.
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This Results in Leaks
.
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Lots of Leaks
.
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A Major Threat
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But We Have Rubber Pads! They Eliminate
Metal to Metal
Contact
Stop The Galvanic
Action
DONT THEY ??
.
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NO Afraid Not
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THINK about it
. Forms Capillary Scaled
Crevice
SUCKS & HOLDSWater
Stops Evaporation
- Sets Up OxygenConcentration Cells
- Rapid Crevice Corrosion
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Poor Design & Misconceptions Those rubber
pads keep
appearing
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Poor Design & Misconceptions
FRP Wear Pads
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Bad Designs - Catastrophic Failure
.
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Bad Designs - Catastrophic Failure Sleeve is 9-1/2 inches long
and provided extended
area of contact corrosion.
Large corrosion area
explains large initialblowoutfailure.
The loose sleeve was foundunder the failure (resting on
top of the pipe support) the
morning after the fire.
.
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Solution?
CREVICE
Identity & Eliminate theProblems
- Tight Crevices
- Ability To Trap and HoldWater
- Eliminate Dissimilar MetalContact (A secondarybenefit)
- Open things up forinspection & maintenance
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Solution?
- KEEP IT DRY
- ELIMINATECORROSION
.
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Excellent Wear Resistance
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Pipe Rack Beam Dressing
.
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Stabilized Supports
.
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Stabilized Supports
Isolate the pipe
Non-Porous
Keep water out
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Cradles & Adjustable Supports
Large crevice
No chance for visualinspection
.
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Cradles & Adjustable Supports
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For Cradles & Adjustable Supports
Isolate the pipe
Allow for evaporation
Open things up for
visual inspection
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Cradles & Adjustable Supports
Large crevice
No chance for visual inspection
.
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Pipe Hangers
Retrofit or New
Gripping Applications
Thermal and electrical
insulation
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Pipe Grippers
.
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Beware of Low Grade Material
Delrin
HMWPE Mystery Meat
.
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Conclusions Keep it dry = Stop
corrosion
Look for excellent wearprotection
High compressive strength
Open for visual inspection
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Thank You...
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