A 335 P23 vs P91 at 567oC

[fvincent]

Do you have any experience with comparing P23 and P91 for steam lines connecting boiler to turbine (400 t/h, 130 bar abs at 567oC)? Is P23 already used in certain extent? Any idea of their costs in USA or Europe or Japan($/kg)?
Thanks a lot

fabio vincent

http://www.figener.com.br

 

[fvincent]

A 213 T23 has been used in HRSG boilers, but I have no notice of A335 P23 being used for long pipes (except pipings between superheaters). Any idea why?

fabio vincent

http://www.figener.com.br

 

[stanweld]

We have installed P23 pipe in superheater headers in 3 coal fired power plants. One of the problems with using P23 pipe in main steam lines and hot reheat lines is its highly limited availability. We have only been able to obtain the large bore heavy wall pipe from Japan.

 

[fvincent]

stanweld, thanks for your reply.
P23 was anyway a better choice than P91 or P92? Can you tell me why?
regards

fabio vincent

http://www.figener.com.br

 

[stanweld]

I was not involved in the material's selection; the Japanese Boiler Manufacturer was.

In terms of tubing, I have been involved in their selection and recommended T23 where tube replacement would occur with greater frequency. This would enable the Owner to replace tubes without PWHT and thereby reduce maintenance costs not to mention initial fabrication costs.