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71000

Rasprava u 'Steam Traction' pokrenuta od jane, 20. Veljača 2011..

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  1. std tank

    std tank Part of the furniture

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    On Standard locos the regulator does not have to be open to ensure cylinder lubrication. Steam is supplied to the oil atomisers via the cylinder cock actuating valve. Obviously, a reasonable steam pressure is required.
     
    std tank, 7. Ožujak 2011.
    #41
  2. Sheff

    Sheff Resident of Nat Pres

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    Surely unless you take the con rods down she must be in steam for lubrication purposes.
     
    Sheff, 7. Ožujak 2011.
    #42
  3. std tank

    std tank Part of the furniture

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    Sheff, I did say that a reasonable steam pressure is required to operate the atomisers, i.e. the loco is in steam.
     
    std tank, 7. Ožujak 2011.
    #43
  4. Sheff

    Sheff Resident of Nat Pres

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    Simultaneous posts STD Tank check the times :)
    I could have quoted the OP but it gets a but tiresome reading the same posts over and over.
     
    Sheff, 7. Ožujak 2011.
    #44
  5. RalphW

    RalphW Nat Pres stalwart Staff Member Administrator Friend

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    OK my mistake, you do not need steam on to ensure lubrication, but my video on post 24, when 71000 comes under the far bridge, it is obvious from the visable exhaust that the regulator is more than just cracked open.
     
    RalphW, 7. Ožujak 2011.
    #45
  6. std tank

    std tank Part of the furniture

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    My apologies Sheff.
     
    std tank, 7. Ožujak 2011.
    #46
  7. alisdairanderson

    alisdairanderson New Member

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    alisdairanderson, 7. Ožujak 2011.
    #47
  8. Tim Fenton

    Tim Fenton New Member

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    Tim Fenton, 7. Ožujak 2011.
    #48
  9. Rick.E

    Rick.E Member

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    Rick.E, 7. Ožujak 2011.
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  10. irwellsteam

    irwellsteam Member

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    Why did she even have to be in steam if she's being towed by a diesel?
     
    irwellsteam, 7. Ožujak 2011.
    #50
  11. Oakfield

    Oakfield Guest

    See post #42 (and previous) above
     
    Oakfield, 7. Ožujak 2011.
    #51
  12. irwellsteam

    irwellsteam Member

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    but surely steamers can be towed without needing lubing up on the move ?? What about when Mallard went to Shildon or when Blackmore Vale was towed around the Bluebell by Sir Archie?
     
    irwellsteam, 7. Ožujak 2011.
    #52
  13. std tank

    std tank Part of the furniture

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    Mallard had its connecting rods taken off and crossheads secured.
     
    std tank, 7. Ožujak 2011.
    #53
  14. RalphW

    RalphW Nat Pres stalwart Staff Member Administrator Friend

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    Having steam pressure on is the only way to ensure oil is fed to the cylinders, you cannot run the cylinders without constant feed, unless as Std Tank says the connecting rods are off, even then I'm sure there would be a fairly severe speed restriction. So it's just not practicable.
     
    RalphW, 7. Ožujak 2011.
    #54
  15. odc

    odc Member

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    OK, this has puzzled me for a while. If your loco has a mechanical lubricator, why is steam still needed. I understand the oil will not be atomised but it will still be there. Is it a temperature thing?

    Someone please explain this, for my better understanding and our mutual improvement......
     
    odc, 8. Ožujak 2011.
    #55
  16. std tank

    std tank Part of the furniture

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    Firstly, cylinder oil is more like treacle than oil. It is actually heated up in the lubricator by the use of a pipe coil through which steam is passed. This makes the oil more pliable (if that's the right word). It is then pumped to the atomisers. Steam is then used to atomise the oil, so that when it enters the cylinders and valve chests there is an even spread of oil obtained. Non return valves are fitted to the atomisers, because you also have steam under pressure in the cylinders which would attempt to escape into the lubrication system. I think I've got that right. Anyone like to add to it.?
     
    std tank, 8. Ožujak 2011.
    #56
  17. RalphW

    RalphW Nat Pres stalwart Staff Member Administrator Friend

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    I think that's about it, there are variations as some loco's would need to have the regulator open a bit to ensure there is steam to carry the oil to the valves and pistons. Just loking at the drivers manual for Sentinel steam waggons, it stresses, when descending long hills 'the driver must ensure that he regularly presses the accelerator pedal (open the regulator) for short periods so that oil will be fed to the cylinders and valves'.
     
    RalphW, 8. Ožujak 2011.
    #57
  18. 32110

    32110 Member

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    On a loco fitted with sight feed lubricator then steam supply would be essential. Removing connecting rods and securing crossheads would be OK for pistons but balance would then be upset. Valve gear also needs to be thought of. So if possible, much easier to move in steam.
     
    32110, 8. Ožujak 2011.
    #58
  19. buseng

    buseng Part of the furniture

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    I think this is particularly so with ex GW locos.

    Edit, just read 32110's post above which says virtually the same thing.
     
    buseng, 8. Ožujak 2011.
    #59
  20. odc

    odc Member

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    I do understand the viscosity of steam oil changes as it heats up and the neceserty to have steam with hydrostatic lubrication but still does the oil have to be atomised. Does it not provide enough protection for short distances. As well as a fireman on the FR I operate many miniture locos that have mechanical cylinder lub with no heating coil or atomisers fitted. The pump just pumps through a clack into the steam line to the valves.
     
    odc, 9. Ožujak 2011.
    #60
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