Risk of through hole on live piping

[mariolucas75]

Dear All,

If a live piping is having localized external corrosion that may be consuming the most thickness of the wall and the line cannot be isolated what would you advise?
Clamp could not be installed due to irregular profile.

Thank you very much

 

[TGS4]

The appropriate approach is to perform a fitness-for-service assessment (typically in accordance with API 579-1/ASME FFS-1). If the pipe is not deemed fit-for-service, then the options are rerate, repair, or retire.

Other than a clamp repair (which you have stated cannot be installed), what are your repair options?

Pipe material, size, pressure, temperature?

 

[dtimberlake]

pressure?
industrial or residential?
live steam or lemonade ?

 

[mariolucas75]

industrial, 12" , 10 bar , flammable liquid....
What kind of repair might be an option ? Welded sleeves ? or boxlike enclosure ?
What is more common ?
Cut / replace does not applicable

 

[LittleInch]

Various epoxy wraps exist, clockspring being one.

Welded sleeve?

Furmanite do boxes I think.

Weld overlay is possible.

What do you mean by irregular profile? Got a picture?

 

[MintJulep]

Hot tap, bypass and stop.

 

[Dhurjati Sen]

It seems only option is to take a shutdown and cut and replace the corroded portion with identical piping.
Your safety department might not issue a permit for the temporary repairs listed above for this particular service of the pipeline.

 

[LittleInch]

Repair of a live line is very high risk, especially if the corrosion is deep.

you need to isolate and depressurise before further work.

 

[mariolucas75]

Various epoxy wraps exist, clockspring being one.

Welded sleeve?

Furmanite do boxes I think.

Weld overlay is possible.

What do you mean by irregular profile? Got a picture?

It has external corrosion build-up 3-4 cm with area of 10 cm x 10 cm .... pipe can not be isolated can not be shut down .... and the profile is irregular

 

[pierreick]

How come? A plant can be shut down, this is a management issue!
What is the fluid? what are the operating conditions?
Can you take a picture?
What is your role within your organization?
Pierre

 

[LittleInch]

Well if you don't isolate it and it leaks or ruptures and catches fire, you won't have any plant left....

All sections can be isolated or shut down, but the impact of not doing it with a known issue is that your risk levels rise considerably.

Call Furmanite