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Re: [MW:31960] Tolerance for straightness of the pipeline

By Materials & Welding
No such drawing recommendation for straightness, the main need of LDO and HFO line are to be seamless pipes as these fuels having high sulphur content the sulphur ingress the crevice of the seam and over a period of time may cause leakage which is a high potential fire hazard during operation ( as you have mentioned IS 2062 please confirm whether it is seamless).  

In recent days Indian power plants avoid use of HFO as the fuel - unburnt, lack of ignition, lack of purity and handling issues. And if the system is not put into continuous operation (even with recirculation and steam tracing) the whole system will get choked over a period of time and restoration would be mere impossible. 

   Regards,

K.Pandiarajan.

On Sun, Jan 24, 2021 at 6:58 PM MUKESH RAWAL <mukeshrawalbe@gmail.com> wrote:

Dear Experts,

I want to approve an FQP for Pipe erection, and in that FQP I want to mention the tolerance limit for the straightness of the pipeline.

I had also referred to relevant specifications and different codes including ASME B31.3 process piping but acceptance criteria is not mentioned anywhere.

Pipe line belongs to Ash slurry, HFO/LDO, and service water pipe used in power plants and the material is IS 2062.
Here I would like to clear that query raised to know the acceptance tolerance as per code in straightness of pipe line at final inspection.

Please suggest on which basis I can mention the tolerance limit for straightness of the pipeline in FQP.

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