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Coating

Coating

(OP)
Hi all,

What coating would be used for field girth weld for a 16" pipeline, design temperature of 85C, coated with a dual-layer fusion bond epoxy. Shrink sleeve, epoxy kit?

Thank you very much.

RE: Coating

(OP)
Thank you for you replies. What would be best for such a situation? Shrink sleeve or liquid epoxy?

RE: Coating

I like shrinks, but your guys have to be smart enough to put them on first.  Maybe you wanna' have some of both on hand, if you know what I mean.

Let your acquaintances be many, but your advisors one in a thousand'  ...  Book of Ecclesiasticus

RE: Coating

You can review DNV-RP-F102 for the range of selection of field joint coatings (you don't say onshore or offshore)

http://exchange.dnv.com/publishing/Codes/download.asp?url=2011-05/rp-f102.pdf

although it won't tell you which ones to select for dual layer FBE factory coating.  Apparently, field application of the same dual layer FBE coating is not under consideration; perhaps it should be?

Whatever you choose, make sure that it first has been laboratory qualified by the manufacturer and has a track record and then make sure that you qualify the field application procedure and the personnel in a yard before letting them loose on the spread or the back of the barge.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04
 

RE: Coating

(OP)
Thank you all. A STAR for SJones for his detailed reply.

RE: Coating

If you do elect to use a coating rather than a sleeve for your girth welds, you may want to consider using a grout first to smooth out any holidays in the weld area prior to applying an epoxy protective top coat.  For example, the designer of a mainline externally coated with Devran 224 HS epoxy coating could stipulate the following two part joint coating kit:

•Enviroline 124 Epoxy Grout Coating Kit followed by Devoe Bar-Rust 235 Epoxy Coating Kit

The coatings referenced in the above example have maximum operating temperatures > 85C.


 

RE: Coating

I can tell you, that we have outlawed the use of shrink sleeves for permanent installations...above or below ground.

RE: Coating

(OP)
"DLiteE30 (Mechanical)
27 Jun 11 17:58
I can tell you, that we have outlawed the use of shrink sleeves for permanent installations...above or below ground."

DLiteE30

I am wondering in what part of the world this has happened and why?

Thanks,

OKCorall

RE: Coating

"We" being, my company, and "law", being our standards...

not really a regulation or law.

RE: Coating

Talks like only a state petroleum company can talk. smile

Let your acquaintances be many, but your advisors one in a thousand'  ...  Book of Ecclesiasticus

RE: Coating

Sleeves are a victimless crime.  Its sparks that should be arrested.

Let your acquaintances be many, but your advisors one in a thousand'  ...  Book of Ecclesiasticus

RE: Coating

We'll hang 'em from the rafters, we will.

RE: Coating

The sale os Scotchkote has been halted in about 10 states due to issues with the VOC content, as of June 1, 2011. Bummer.  

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