| Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise


Download our free e-book! Overcoating bridges and other structures.

Problem Solving Forum

| More

March 21 - March 27, 2011

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 Simon Hope of Bilfinger Salamis on April 4, 2011:
     Explosive decompression has been the bane of the offshore process coatings manufacturers for many years now. The first major failures occurred in spray-applied glass flake vinyl and polyester linings in systems operating at high pressure (100s Bar) and temperature (around 100 C min). Research found that small (organic) molecules were migrating as liquids at the operating criteria into the interstitial spaces that were created during spray application due to the random orientation of the flakes. When the process is depressurised in an emergency, the molecules which are liquid during operation, volatilise creating huge pressure stress within the coating that may manifest itself as either a blister or an area of cohesive failure within the coating. The problem can be improved by using trowel-applied coatings with larger flakes, which are 'organised' due to the way the material is trowelled and rolled, thus reducing the interstices. Care must also be taken to ensure that the material is used within its Tg (glass transition temperature), as this exacerbates the failure rate due to the weakening of the coating film. Cold-wall effects play a large part in coating failures where stresses are introduced along with migration to the substrate.

From James McDonald of Hempel on March 30, 2011:
     Rapid depressurization of lined vessels can cause catastrophic failure to the lining system. This problem is most evident in vessels or pipelines with CO2 in the vapor space above the cargo. The vapor permeates the surface of the coating, and when a rapid depressurization event occurs, that vapor expands inside the coating and typically causes cohesive failure . The West Texas Oil & Gas Market has struggled with this problem for years due to the high CO2 levels used in tertiary recovery.

From Chris Faulstich of SALC, Inc. on March 25, 2011:
     I would think that rapid depressurization would lead to cavitation, causing loss of coating(s) and even metal in the area of cavitation.

Please sign in to submit your answer this question    

Tagged categories: Coating failure; Pipeline

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

DeFelsko Corporation
PosiTector Inspection Kits

PosiTector 6000 Coating Thickness Gage easily converts to a surface profile gage, dew point meter or ultrasonic wall thickness gage with a simple probe change

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

Novetas Solutions
Abrasive Blasting near or over water?

100% Recycled Glass! NO Arsenic, Beryllium or other Toxic Metals! Great White Metal Finish and Safer than Slags! Call us at 866-775-6226

NACE International, The Corrosion Society
Get the Basics Anytime, Anywhere!

Take this online training to eliminate juggling your work schedule with continuous education. Learn corrosion causes, types, and how it can be controlled.

KTA-Tator, Inc. - Corporate Office

• Coating failure analysis
• Independent
  comparative testing
• Accelerated
  weathering testing
• Toxic metals testing
• A2LA Accredited
Contact: Cindy O'Malley,
at 412-788-1300 x180

Fischer Technology Inc.
DUALSCOPE®FMP100 with DataCenter IP

Transfer customized inspection plans from PC to FMP100 using step-by-step guidance with prompts and pictures throughout the measurement procedure

Waterjet Technology Association (WJTA)
2016 WJTA-IMCA Expo Nov. 2-3, New Orleans

See the latest advances in automated and handheld UHP waterjetting tools/systems for paint/coating removal, surface prep, industrial cleaning. Exhibits, live demos.

Blastman Robotics Ltd.
Robotic Blast Cleaning

Replace manual blasting with new Blastman robot models. Contact us to boost your production and save costs!

DeHumidification Technologies

DH Tech has the most innovative and reliable equipment available to
control humidity efficiently
and effectively.

W Abrasives - Surf Prep Pack

Experts in surface preparation are not working only on greens. To discover the SURF PREP PACK dedicated to experts. Visit our website,

Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design 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

© Copyright 2000-2016, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail