cement line piping integrity

[piiengineers]

Is there any test method to find out the cement bonding strength/remnant life of cement lined piping header which is 30 years old?We are getting frequent leaks in the above header due to to lining failure and cement particle coming out from the header piping.Regualr UT scanning did n't help us to find out the exact corrodion locations.Any other proven NDT method available to check the header integrity?

regards,

[arcpro]

Is problem new or existing from much of time?
You must carry out a complete Root Cause Analysis in order to start with right mitigation steps.
Just to provide you a hint, have you tried doing LRUT on these lines?

[mechcolor]

I have seen people using RFT for inspection of lined pipeline.
What I remember, RFT is possible for cement lined pipelines also and for much of length and even greater diameters.
For inspection of cement lined pipelines running aboveground or underground inspection companies use snake RFT tool covering the whole length of piping from one end to the other. There are launch stations and receiving stations for RFT tool to undertake complete internal inspection.
RFT inspection will provide you with the areas having thickness loss which can be further inspected to ensure integrity.
RFT can come up with some clear findings whereas LRUT will confuse you in your case due to cement lining (attenuation problem).

If you require any further details, do let me know.

[arcpro]

Conducting RFT on lined pipelines is new for me.
mechcolor: Please share some literature on this if available with you.

[mechcolor]

I will share some useful literature soon.

[mechcolor]

I have found a presentation which I am unable to upload here.
Follow the link to download the same.
http://www.ohiogasassoc.org/rft.pdf

[ben]

piiengineers,
What is the size of the header?

[piiengineers]

I saw the presentation but the above technique is used for external concrete lined pipe and not internally cement lined pipe.Regarding answer to ben question the line size is 24",36" & 42".

regards,

[mechcolor]

I confirm you that RFT technique can work through internal liners also.
See page 30 of the presentation where an example of cement lined piping has been mentioned. The piping in that example is also encapsulated in concrete along with lined with cement internally.
See last page (39) also about major features of RFT Snake Tools.

[ben]

The reason I asked for the sizes is that this RFT technique with snake tools would only do good up to 8", what I know the best.
You may have to look for some other electro-magnetic NDT inspection which can do well with the pipe sizes you have.
However, RFT with snake tools do not need any direct connection with the base metal for flaw detection / monitoring and can do well with internally lined pipes.