Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site




Problem Solving Forum

| More

July 31 - August 4, 2017

How does rapid depressurization affect lining performance in vessels and line pipe, and how can you identify any failure that might result?

More items for Quality Control

Selected Answers

From Michael Halliwell of Thurber Engineering Ltd. on August 10, 2017:
Thanks I said, I don't have as much experience on them and had only liquids come to mind initially. I can certainly see how the gas/polymer interactions could also cause significant issues.

From Steve Brown of EDF Energy Ltd on August 8, 2017:
One aspect not covered by the previous answer, but which could lead to catastrophic failure, concerns the solubility of gases in polymers, which can be substantial at high pressure. Slow subsequent depressurisation (DP) would lead to simple diffusion/desorption of the gases out of the solid, with probably no effect on mechanical/physical properties. However, rapid DP can lead to catastrophic disruption of polymers, which if viewed (e.g., experimental rig), might show as large volume increase with 'massive' blistering. I have seen this on experiments of various gasket /o-ring polymers, and interestingly, while the materials are clearly 'destroyed' mechanically, they often would return post-experiment back to their original size/shape with little sign of having suffered any distress! The environments were carbon dioxide with pressure reduced from ~40bar to atmosphere in ~20 minutes. Certain polymers/formulations were resistant, while others failed in the manner described, so one can only predict behavior by experiment, I believe. Linings are typically much thinner film polymers than o-rings, and so I would expect linings to be less sensitive to DP. The actual effects are also likely to be very sensitive to gas type/mix, DP range (bar) and DP rate.

From Michael Halliwell of Thurber Engineering Ltd. on August 3, 2017:
I might not be able to help much on the modes of lining failures (I'll throw some ideas out there.), but I can add to how the rapid depressurization can work on the lining system. When pressurized, the tank and piping will experience elastic stretching due to the pressure. The amount of stretch will depend on the pressure contained and the material both tank and piping are made out of. When the pressure is rapidly released, both quickly return to original shape. If they respond at different rates, I suppose there is the potential for delamination and/or cracking of the coating as a result of the pressurization and stretching of the vessel and piping. If it is cyclic, then the stretch and contraction could further crack the lining, delaminate it or even force whatever is in the tank and pipe behind the coating (blisters?) and have it leveraging the delamination,like a freeze-thaw cycle destroys asphalt.

Please sign in to submit your answer this question    

Tagged categories: Coating failure; Linings

Current PSF Question | Submit a PSF Question | Full PSF Archive

Fischer Technology Inc.
FISCHER Expands Corrosion Product Line
Rounding out Fischer’s extensive line of products for measuring protective coatings in the corrosion industry is the new ultrasonic wall thickness gauge UMP series.

HoldTight Solutions Inc.
Our HoldTight®102 salt remover & flash rust
preventer prevents flash
rust by removing surface contaminants. Contact us
for your nearest distributor.
(800) 319.8802

Industrial Vacuum Equipment Corp.
Hurricane Vacuums
& Dust Collectors
Vacuum and dust collector hose, filters and related accessories.

Tarps manufacturing, Inc.
QUALITY MADE IN AMERICA —Available near you!
CLICK to get a behind-the-scenes look at how Tarps Manufacturing makes the highest-quality tarps right here in the USA — available nationwide.

DeFelsko Corporation
PosiTector SST Soluble Salt Tester
Measures the concentration of soluble salts on metal surfaces. Use with all Bresle patch types including the reusable, adhesive-free PosiPatch.

KTA-Tator, Inc. - Corporate Office
KTA-Tator Training Course Opportunities
• IACET Authorized Continuing Education Unit (CEU) Provider
• Live Basic Coatings Inspection Courses
• Customized/Private Courses
• Online/self-paced curriculums
Contact: Tiffany Kelly at 412-788-1300 x217

Modern Safety Techniques
Modern Safety Techniques
With our unique LTCat, we can help to provide clean, safe breathing air to your workers. Take a look at our Breathing Air Systems, we supply at least twice as much charcoal as our competitors! Modern

Blastox/The TDJ Group, Inc.
Blastox® - One Step Lead Abatement
Sandblast additive delivered to jobsite pre-blended to eliminate hazardous abrasive wastes. Why mix, meter or apply at the job-site? Blast with ease and
Let your painters paint!

Sky Climber, LLC
Solutions in Suspended Access
Safely reach workspaces regardless of size or purpose with our full line of Hoists, modular Platforms, and versatile Workcages.

Absolute Equipment/Grand Rental Station
We have Tier 4 Equipment including Air Compressors & Generators for Sale & Rent! Your job may now require Tier-4. or Call 412-931-6655.


Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL

The Technology Publishing Network

Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us