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MellishR 近期的活动

  1. MellishR 支持 Sheff 在 6024 King Edward 1 内发表的帖子.

    I was an engineer in the chemical industry all my working life and firstly for our sins they were always referred to as vacuum pumps, be they recip, liquid ring or whatever. However, in design and specification, we always used absolute pressure...

    2026-06-01 , 20:16

  2. MellishR 支持 GW 5972 在 6024 King Edward 1 内发表的帖子.

    I’m not going to comment on the cause of the squeak in case it leads to another forty posts!!!

    2026-06-01 , 20:15

  3. MellishR 支持 Wenlock 在 6024 King Edward 1 内发表的帖子.

    It is labelled both Air Pump and Vacuum Pump. I suppose it could be called the "Vacuum Maintaing Air Pump" :) But what really matters is, why does it squeak? Is that a fault, or is it an indication of a good seal around the piston?

    2026-06-01 , 20:15

  4. MellishR 支持 Jamessquared 在 6024 King Edward 1 内发表的帖子.

    Yes, but we’d also put a liquid nitrogen trap in the circuit between pump and vacuum line to prevent the pump oil absorbing volatiles and reducing the efficiency, and I’d like to see the Swindon drawing for that! Tom

    2026-06-01 , 20:15

  5. MellishR 支持 26D_M 在 6024 King Edward 1 内发表的帖子.

    To be further pedantic, the "pump" maintains the vacuum, created by a steam ejector, once on the move ....

    2026-06-01 , 20:13

  6. MellishR 支持 Deepgreen 在 Steam Dreams 2026 内发表的帖子.

    Perhaps edging towards the situation where patrons can only dream of steam!

    2026-06-01 , 19:58

  7. MellishR 回复主题: 6024 King Edward 1.

    I'm ready to out-pedant the best of them but, as the reason for the pump's existence is to create a (partial) vacuum, I see nothing wrong with calling it a vacuum pump.

    2026-05-31 , 18:26

  8. MellishR 支持 torgormaig 在 6024 King Edward 1 内发表的帖子.

    So is it a vacuum pump, or is it an air pump? Is it a railway station or is it a train station? In both situations we all know what people are talking about and as far as I can see both terms are correct in their respective situations. On the...

    2026-05-31 , 18:23

  9. MellishR 回复主题: Saphos Trains 2026.

    If a rake includes even one coach with aircon it will need to include either a diesel or a generator car.

    2026-05-30 , 15:59
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