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Post by suctionhose on Oct 6, 2014 10:24:15 GMT
Surely the obvious and best place to feed the oil is in the centre of the steam union pipe under the smokebox, especially on 2 cylinder locos. This is where I've done it. Rob The obvious may be as you say but equally may not be too! Whatever the setup, you want to divide the oil equally each way. The recent discussion is about whether introducing the oil earlier and in a deliberate fashion will improve the atomising effect. I favour separate supplies to each valve chest but it can be over oiled especially a smallish engine. One of mine has a single feed split two ways that enter the steam flows right as they enter the steam chests. Other engines I have have various arrangements, including hagley type atomisers, according to best estimation of what might be best. It's got me wondering now. I may make a test rig to see.
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Post by Deleted on Oct 6, 2014 10:32:27 GMT
Hi DAVID--------- don't try using the forum's own photo posting as we've exceeded the limit many moons ago......You'll need to use a Hosting Site ( I use TINYPICS ... tinypic.com/ ...) and just follow the prompts.........
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Post by ejparrott on Oct 6, 2014 11:09:00 GMT
I'll be using a separate pump for each cylinder, so I'll have two separate feeds to the steam pipes. Because I don't want the connections in the smoke-box, because it'll be so fiddly to work on, each feed will go direct to each steam chest. Not much I can do about that, as the smoke-box sits on top of the steam chests.
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Post by Deleted on Oct 6, 2014 11:46:55 GMT
Michael Breezes V2 design has one mechanical lubie which has 1 delivery pipe to just behind the middle cylinder, at that point it splits to 3 pipes and is fed into each of the cylinder steam pipes
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robmort
Hi-poster
3.5" Duchess, finishing 2.5" gauge A3 and building 3.5" King
Posts: 172
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Post by robmort on Oct 6, 2014 14:23:01 GMT
Surely the obvious and best place to feed the oil is in the centre of the steam union pipe under the smokebox, especially on 2 cylinder locos. This is where I've done it. Rob The obvious may be as you say but equally may not be too! Whatever the setup, you want to divide the oil equally each way........... The oil is indeed divided equally each way when fed into a central steam feed because it is carried from there by the steam flow into each cylinder in turn, and most of the oil is likely be vaporised, or at least converted into a mist, at the same time. Arranging separate feeds to cylinders might be unavoidable in practice, but there is also slightly more risk in unequal feeds if thee is any difference in the legs, and I don't see the advantage in this.
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Post by digger on Oct 6, 2014 16:32:29 GMT
I fail to see how the oil could 'vapourise' if of the correct type, ie. compounded it contains fatty acids. and after leaving the sight feed as a globlule of oil, it picked up via the small steam supply from the manifold (at boiler pressure), to the atomising valve, and leaves the atomising valve as an oil emmulsion, to be carried down the hollow stay, using the pressure differential that exists between the boiler, and steam chest pressure, (steam chest pressure will always be lower) As each cylinder should take an equal amount of steam, the oil emmulsion should be reach both cylinders.
Digger
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jma1009
Elder Statesman
Posts: 5,901
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Post by jma1009 on Oct 7, 2014 0:11:46 GMT
digger's description of emulsion of oil is a very good description.
i personally have my doubts whether admission of oil into the 'T' steam pipe between cylinders as described by robmort is enough, and take the view that an earlier admission of the oil into the system is beneficial.
i dont think that the V2 Breeze design is ideal and with a bit of thought can be improved upon
cheers, julian
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Post by Deleted on Oct 7, 2014 0:41:15 GMT
I'm of the opinion that cylinder oil should be introduced as early as possible after superheating....so it's either direct into the DRY header or the delivery pipe/pipes that come out of it and ideally into the centre of a column of high velocity steam.....
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Post by suctionhose on Oct 7, 2014 11:26:36 GMT
I'm of the opinion that cylinder oil should be introduced as early as possible after superheating....so it's either direct into the DRY header or the delivery pipe/pipes that come out of it and ideally into the centre of a column of high velocity steam..... I tend to agree with you. I wonder if I made a 1\2" copper tube up with a few bushes along its length for oil addition ... Then blew steam through it as oil was added... Maybe I'd see that difference when it hit the wall?
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John A
Active Member
Posts: 47
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Post by John A on Oct 8, 2014 16:49:30 GMT
Is the Glycerine the stuff sold at the chemists for a sore throat ?
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uuu
Elder Statesman
your message here...
Posts: 2,812
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Post by uuu on Oct 8, 2014 17:12:46 GMT
Yes, or supermarkets, in the cake ingredients section.
Wilf
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Post by Deleted on Oct 8, 2014 23:05:08 GMT
Yes, or supermarkets, in the cake ingredients section. Wilf -------------- Us "Model Engineers" certainly get about, don't we ??
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Post by gardener69 on May 26, 2015 15:13:48 GMT
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