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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...