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TRIPLE Marine Steam Engine - German Museum München
Posted: Sun Jul 05, 2020 9:10 am
by dampfspieler
Hello,
this Video of a sectional cutted open marine steam engine of SCHICHAU in german museum is impressive.
[Youtube]
https://youtu.be/kPtRvCuvJ6w[/Youtube]
Best Dietrich
Re: TRIPLE Marine Steam Engine - German Museum München
Posted: Sun Jul 05, 2020 3:02 pm
by RNoe
That triple expansion engine has some very sophisticated design aspects in the valving.
Things I have not heard of before.
Thanks for sharing.
RussN
Re: TRIPLE Marine Steam Engine - German Museum München
Posted: Sun Jul 05, 2020 7:27 pm
by PeteThePen1
Thanks Dietrich
That is an excellent video and good to see that there are explanatory 'sub-titles' (Not sure what the correct name is for on screen labelling!).
Regards
Pete
Re: TRIPLE Marine Steam Engine - German Museum München
Posted: Sun Jul 05, 2020 8:43 pm
by dampfspieler
Hi Russ,
... some very sophisticated design aspects in the valving
that is named
Meyer expansion control.
It was often used German marine steam engines.
Best Dietrich
Re: TRIPLE Marine Steam Engine - German Museum München
Posted: Mon Jul 06, 2020 2:18 am
by RNoe
Dietrich:
Thanks for the Meyers link. Unfortunately my German is insufficient to understand the text.
I may have to send that to my 84-year-old Step-Mom in Seattle for translation.
She was born and raised in Hamburg.
RussN
Re: TRIPLE Marine Steam Engine - German Museum München
Posted: Tue Jul 07, 2020 1:35 am
by Lopez Mike
I believe there was an attempt to use this sort of thing on some locomotives long ago (late nineteenth century) on the Central Pacific railroad in the western U.S. It was called Stevens valve gear (not stevenson). It was the brain child of the chief engineer of the railroad, A.J. Stevens, and was a constant hassle for the operating department as few workers in the field could keep it adjusted properly. It was promptly replaced with Stevenson gear as soon as Mr. Stevens retired!
https://books.google.com/books?id=qJIOA ... R&f=false
Fuel costs were not thought important in those days. Wood was pretty much free.
I have no idea whether A.J. Stevens was any relation to the very well known steam engineer of the same last name working much earlier in the century on marine designs. Quite different valve gears though.
Re: TRIPLE Marine Steam Engine - German Museum München
Posted: Tue Jul 07, 2020 7:14 am
by steamboatjack
Meyer expansion gear was very common in UK on the smaller types of horizontal engines used on land, not so common for marine use where a constant load was expected.
I would have thought it an over complication on a navy ship. Trick valves were used basically to reduce the length of valve stroke while still allowing a large and fast opening port. It’s a pity the electric motor is driving the engine “astern” when the links are almost in the “ahead” position.
Jack