FBE Tail protruding from 3L-PP anticorrosion coating on pipes
FBE Tail protruding from 3L-PP anticorrosion coating on pipes
(OP)
Hi guys,
I'm working as coating engineer and I have a question regarding the FBE tail protruding from a 3L-PP or 3L-PE anticorrosion coating on pipes.
In my opinion any residual FBE at the cutback area should be avoided as it could be detrimental for field joint coating and AUT operations...
Nevertheless I hear many people asking for a minimum 10 mm tail for example.
What's your opinion on that?
Regards,
NB
I'm working as coating engineer and I have a question regarding the FBE tail protruding from a 3L-PP or 3L-PE anticorrosion coating on pipes.
In my opinion any residual FBE at the cutback area should be avoided as it could be detrimental for field joint coating and AUT operations...
Nevertheless I hear many people asking for a minimum 10 mm tail for example.
What's your opinion on that?
Regards,
NB





RE: FBE Tail protruding from 3L-PP anticorrosion coating on pipes
"I think it would be a good idea."
- Mahatma Gandhi (1869-1948),
when asked about Western civilization
RE: FBE Tail protruding from 3L-PP anticorrosion coating on pipes
I agree that the main point is to ensure a proper bonding between the FBE and the PP, but I don't see how the tail could help that. when we preheat the pipe with induction coils in order to apply the HSS we pass the Tg of the FBE so we destroy the tail which in fact will be just residual FBE, not a proper protective tail. Furthermore during the blasting of the field joint area this tail can be damaged and again we will have just a damaged coating, not at all protective.
So it seems to me that this tail will not serve as a protective coating but will result just in a residual FBE wich in my opinion could cause some problems during the AUT test being seen as a defect.
NB
RE: FBE Tail protruding from 3L-PP anticorrosion coating on pipes
"I think it would be a good idea."
- Mahatma Gandhi (1869-1948),
when asked about Western civilization
RE: FBE Tail protruding from 3L-PP anticorrosion coating on pipes
NB
RE: FBE Tail protruding from 3L-PP anticorrosion coating on pipes
One caution, make sure your cutback corresponds to the width of your shrink sleeves.
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: FBE Tail protruding from 3L-PP anticorrosion coating on pipes
I do usually consider for the width of the sleeve 50 mm minimum (after shrinkage of the sleeve)overlap on the factory applied coating.
Cheers,
NB