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

 

Advertisement

PaintSquare


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

Advertisements
 
DeFelsko Corporation
 
PosiTector SHD Shore Hardness Durometer
 
PosiTector SHD measures the hardness of non-metallic materials. Features a measurement timer, auto ignore mode and internal memory. Shore A or D available.
 

 
HoldTight Solutions Inc.
 
NO FLASH RUST - NO CONTAMINANTS
 
Our HoldTight®102 salt remover & flash rust
preventer prevents flash
rust by removing surface contaminants. Contact us
for your nearest distributor.
(800) 319.8802 sales@holdtight.com
 

 
KTA-Tator, Inc. - Corporate Office
 
Instrument Service Department
 
Are you a QP certified contractor? KTA’s Instrument Service Department can help keep you compliant!
Click or call 1-800-KTA-GAGE.
 

 
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)
 
Click to register today!
 
See the latest automated and handheld UHP waterblasting tools/systems/products. Exhibits, live demos, educational sessions, waterjet short course, networking.
 

 
Mitsubishi Gas Chemical America
 
Performance Amine 1,3-BAC
 
A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.
 

 
Monti Tools, Inc.
 
BRISTLE BLASTER® – THE ORIGINAL ONE
 
  • Abrasive blast with a power tool
  • Remove corrosion, mill scale and coatings
  • Cleans & roughens
  • Meets SSPC-SP 10 / NACE No. 2
  • Profile up to 4.7 mils
  • ATEX Zone 1
  •  

     
    Clemco Industries Corp.
     
    Maximum Dust Suppression Systems Start at $14,950
     
    The system comprises proven technology and equipment with user-friendly flexibility in mind. See it in action.
     

     
    SABRE Autonomous Solutions
     
    Repeatability
     
    The ALPHA1 provides reliable results consistently allowing you to cost your next job with confidence.
     

     
    SEMicro Division, M.E. Taylor Engineering, Inc.
     
    Coatings Adhesion Testers
     
    The PATTI® accurately measures the bond strength between coating & substrate. Outfitted properly, the surface can be rough, porous, or curved & >10K psi strong!
     

     
     
     

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

    TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@paintsquare.com


    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 PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us