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Post by andyhigham on Sept 14, 2023 18:06:33 GMT
I was wondering if there would be any advantage in lagging the steam pipe to the injector. I expect it would increase the steam temperature at the injector and therefore the energy
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Post by ettingtonliam on Sept 14, 2023 21:03:16 GMT
Can't do any harm, can it?
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Post by chris vine on Sept 15, 2023 9:23:23 GMT
Hi Andy,
I saw an article recently about lagging model steam pipes. SMEE Journal??
The take home from this was that it doesn't make much difference to the heat loss.
Might save you some trouble!!
(Funnily enough, the last thing you want for an injector is superheated steam, as it doesn't condense onto the feed water so easily.)
All best
Chris
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Post by andyhigham on Sept 15, 2023 10:14:43 GMT
It may save burnt fingers though
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Post by chris vine on Sept 15, 2023 10:44:01 GMT
Very true.
Mind you, mine have grown an asbestos layer over the years!
C
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Post by suctionhose on Sept 16, 2023 22:44:41 GMT
Andy if you are thinking about your new Foden, injectors are fairly tolerant on the steam supply side. Warm water is the difficulty.
Foden models I've seen suffer with the feed pump located in a hot place beside the firebox circulating water via the tank. Same with TE's plus radiant heat transfer to the front of tank. Heat shield helps.
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Post by andyhigham on Sept 17, 2023 7:22:19 GMT
Ross
The feed pump bypass is returned to the pump suction line so hopefully will not cause the tank water to heat up
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Post by Roger on Sept 17, 2023 17:17:37 GMT
Yes, the energy in the Steam would be greater, but being hotter it means that it will take more water to fully condense it, which is necessary for it to enter the boiler. So what you would be doing is slightly changing the operating characteristics. You could argue that the Steam Cone throat size should be slightly smaller to reduce the amount of Steam that needs to be condensed.
I suspect that the reality is that it makes very little difference. It might help to extend the working range to a slightly lower pressure if you kept everything else the same. However, you could also argue that it might make working with high temperature feed water more of an issue because there's more heat to absorb.
Fortunately, a well designed set of injector proportions, accurately made, allows for a fair amount of leeway in the conditions the Injector is expected to work in. You probably wouldn't notice the difference.
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