Condensate return

[Boilerbreaker]

I'm currently repairing a old 3 drum B&W boiler and found that the plant was bypassing the DA with their condensate return and pumping it straight into the boiler
I've been repairing boilers for long time and never seen condensate system set up in this manner an industrial boiler setting.
So I have a question.
What could be any adverse effects of bypassing the DA with the condensate water?
Possible Oxygen pitting would be my first guess but I'm not in the water treatment business.

I'm very courious

 

[Karl_northwind]

hate to say it but I think you're in the wrong place. there may be a couple steam heads here to talk to, but there is almost no discussion of steam here. I'd suggest you look on heatinghelp.com they have some real steam gurus there.

trying to be helpful,
karl

 

[Boilerbreaker]

Ok

hate to say it but I think you're in the wrong place. there may be a couple steam heads here to talk to, but there is almost no discussion of steam here. I'd suggest you look on heatinghelp.com they have some real steam gurus there.

trying to be helpful,
karl

thanks

 

[Boilerbreaker]

Ok
Thanks

 

[mustash29]

Higher O2 in the condensate / feed water is a pretty good guess on the chemistry end.

Operationally, bypassing the DA seems it would lead to cooler feed water and more thermal shock when it enters the boiler. And cooler feed water will reduce overall plant thermal efficiency.

At my plant, condensate runs about 100 F. The DA runs about 250 - 275 F. It's set to 10 psi and is supplied by low pressure TG extraction steam with main steam backup if TG extraction is not enough.