Replacement of Economiser
Replacement of Economiser
(OP)
We have been planning replacement of complete economizer banks in 500MW boiler of 25 years old. We planned sponge ball testing for thoroughness check of new coils before welding. Chemical flushing ( DM filling and ammonia dosing for up to 9.5 pH)of new banks after complete erection. Please discuss best methodology in this aspect.





RE: Replacement of Economiser
RE: Replacement of Economiser
RE: Replacement of Economiser
RE: Replacement of Economiser
RE: Replacement of Economiser
It is good to know and record photos so that when you look again in 5 years you can see if it has changed.
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P.E. Metallurgy, Plymouth Tube
RE: Replacement of Economiser
None, other than the neighbors. Steam blow is LOUD if properly done. And you need to build and anchor the temporary discharge pipe. I prefer blowing, myself. Borescoping hundreds & hundreds of tubes is boring. If you get inattentive, or the snaky scope curls at the wrong moment, you could miss a nut or die-grinder bit. The steam misses nothing, assuming that the pressure & velocity are adequate.
RE: Replacement of Economiser
The Coils are almost 12mt length and 10 bends/loops ( total length of 288mt each), which needs extra care in maintaining steam pressure and temperature. In addition the coils will be lifted for positioning and welding, where the debris generated from weld also react with the water entrapped.
Please discuss further.
RE: Replacement of Economiser
RE: Replacement of Economiser
RE: Replacement of Economiser
RE: Replacement of Economiser
RE: Replacement of Economiser