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Having fun in the boiler
Posted: Tue Apr 28, 2015 11:36 pm
by plain ol Bill
Two boilermakers buddy welding a reheat tube. Note how tight the space is. This is the cap so they have a TIG root in, filled and capped w/ 8018 or 9018. Reheats can have 3-4 metal combinations according to the place in the row and elevation. These are some of the easier tubes to weld in a boiler. That is likely a 2 1/2" dia. x .220 wall. Personally I NEVER relit a used rod. Always grab a new one cause the company is buying them and it lessens the chance of porosity on the pick up.
https://www.youtube.com/watch?v=lM-fdhnjlTg
Re: Having fun in the boiler
Posted: Thu Apr 30, 2015 12:58 pm
by weldingt
Looks like a ton of fun. The ones where you can get someone on both sides are usually better than the ones that have to be airbagged and welded one side at a time. Good fun though.
Re: Having fun in the boiler
Posted: Thu Apr 30, 2015 4:04 pm
by weldin mike 27
Is that similar to where they cut a window in the pipe and weld it from inside?
Re: Having fun in the boiler
Posted: Fri May 01, 2015 11:54 pm
by weldingt
Mike, Whenever possible they try to avoid window welds. In tangent tube furnaces with welded membrane, window welds are necessary. Than furnace design is not common.
The tubes I was spoken of were those where you could only weld one side at a time. Sometimes scaffold or boiler configuration prevents you from being able to get to both sides at once.
Old page on one of my old sites about window welds.
http://www.weldingdata.com/WindowWelds.htm
Re: Having fun in the boiler
Posted: Sat May 02, 2015 12:27 am
by weldin mike 27
Awesome. I think its done it AUS a bit, but we can be a bit backwards here. Plus few new power stations have been built here in recent years. (in Victoria anyway)
Re: Having fun in the boiler
Posted: Sat May 02, 2015 6:41 pm
by plain ol Bill
Most boiler inspectors (Hartford especially) really frown on window welds. The only window welds we ever put in were on some radiant reheat tubes that had zero clearance to water wall tubes on one side. Combustion boiler design. Hated working on those damn radiant tubes.
Re: Having fun in the boiler
Posted: Sat May 02, 2015 7:33 pm
by weldin mike 27
Thanks for the information. I'm not versed in power station or boiler stuff, so it's all just observation.
Re: Having fun in the boiler
Posted: Mon May 04, 2015 6:32 am
by weldingt
They were used commonly in Black Liquor Recover boilers in paper mills. I never encountered the need fir a window weld in a power boiler however my experience is only mine.
In the cases where I was involved, they were always composite tubes. 300 series ss over SA210-A1 core.
Re: Having fun in the boiler
Posted: Mon May 04, 2015 6:56 am
by weldin mike 27
I'll post it on my other page, to get a feel for how common it actually is here. Someone should know.
Re: Having fun in the boiler
Posted: Mon May 04, 2015 6:58 am
by GreinTime
Go to sleep micky
Re: Having fun in the boiler
Posted: Mon May 04, 2015 7:27 pm
by Otto Nobedder
GreinTime wrote:Go to sleep micky
Go back to sleep, Sam,
It's AM in Oz, as he posts this.
"Worldwide forum."
Steve S
Re: Having fun in the boiler
Posted: Mon May 04, 2015 10:06 pm
by weldin mike 27
According to my sauces...(BBQ and tomato) it is common here in AUS, both for repairs and (apparently) close outs where the final lot of tubes are welded in, cutting off access.
Re: Having fun in the boiler
Posted: Tue May 05, 2015 6:38 am
by GreinTime
I know. I normally messaged him on Facebook as he was getting home from work lol