PaintSquare.com
      | Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise
  

 

Download our Free Top Contractors e-Resource Guide.

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

Fischer Technology Inc.
NEW PROBE FOR MEASURING TSA THICKNESS

Paired with the PHASCOPE PMP10, Fischer’s new probe is quick and accurate for measuring thermally sprayed aluminum on stainless steel. Click to learn more.


KTA-Tator, Inc. - Corporate Office
KTA-Tator
Coatings Inspection

Any structure, any height, any place - A qualified coatings inspector is always available. Call 1-800-245-6379.


SAFE Systems, Inc.
Enduroguard -
The Tough Cable
for a Tough Industry.

Reduce maintenance costs and down time, increase job site safety with Enduroguard Cable. Available exclusively from SAFE Systems. UL listed, flexible, abrasion resistant and cut resistant.


Industrial Vacuum Equipment Corp.
Hurricane Vacuums
& Dust Collectors

Vacuum and dust collector hose, filters and related accessories.
IndustrialVacuum.com


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


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.


Nationwide Overspray
Profession Overspray Removal Services

The Finest Name in Safe Overspray Removal. We specialize in removing all contaminants from any surface. Family Owned and Operated for 33 years! Fully insured. Satisfaction is guaranteed.


US Minerals
US Minerals -
Black Magnum

With nationwide production and distribution capabilities, U.S. Minerals supplies a complete range of coal slag and other abrasives to meet all of your blasting needs.


Sherwin-Williams
Sherwin-Williams General Polymers Resinous Flooring App

Our coatings and linings expertise available 24/7, allowing you to explore the Sherwin-Williams systems best suited for your flooring needs. Android Users Click here to Download the app today!


Montipower, Inc.
The MBX Bristle Blaster

Get a 2.7 to 3.3 mil profile and a Near White Metal Clean. For info visit www.mbxit.com or call 877 629-8777

 
 
 

Technology Publishing Co., 2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951

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