Omega Owners Forum

Chat Area => General Discussion Area => Topic started by: Lizzie_Zoom on 06 June 2009, 19:54:53

Title: Piston trouble.....
Post by: Lizzie_Zoom on 06 June 2009, 19:54:53
....no not on a miggy, but on the Standard 5 4-6-0 73096 on the Mid Hants Railway!

You may think you have problems when the cam belt breaks, but this is what can happen on a steam railway engine when apparently a cylinder core-plug breaks loose and gets in the way.......!!! :'( :'( :'( :'( :'(

(http://i282.photobucket.com/albums/kk247/lizziefreeman/73096Cylinder.jpg)
Title: Re: Piston trouble.....
Post by: Andy B on 06 June 2009, 19:58:08
Ooops!
I've never really thought about it before, but what kind of steam pressures & temps are we talking about from a stm train loco?

In English units please!  ;)  ;)  ;)
Title: Re: Piston trouble.....
Post by: Mr Skrunts on 06 June 2009, 20:00:34
ooooo, thats looks painfull :-/
Title: Re: Piston trouble.....
Post by: KillerWatt on 06 June 2009, 20:04:51
Quote
Ooops!
I've never really thought about it before, but what kind of steam pressures & temps are we talking about from a stm train loco?

In English units please!  ;)  ;)  ;)
F**king s**t loads
Title: Re: Piston trouble.....
Post by: Lizzie_Zoom on 06 June 2009, 20:06:10
Quote
Ooops!
I've never really thought about it before, but what kind of steam pressures & temps are we talking about from a stm train loco?

In English units please!  ;)  ;)  ;)

On average, depending on the type of engine you are talking about 250 psi at 405 degrees fahrenheit, but 300 degrees higher if using superheated steam, with say bulleid pacific classes being run at 280 psi at 750 degrees F., superheated.

 ;) ;)
Title: Re: Piston trouble.....
Post by: nick v6 on 06 June 2009, 20:12:26
oh my god
i bet that went with a bang :o
ive never seen anything like that before
Title: Re: Piston trouble.....
Post by: Andy B on 06 June 2009, 20:16:44
Quote
Quote
Ooops!
I've never really thought about it before, but what kind of steam pressures & temps are we talking about from a stm train loco?

In English units please!  ;)  ;)  ;)

On average, depending on the type of engine you are talking about 250 psi at 405 degrees fahrenheit, but 300 degrees higher if using superheated steam, with say bulleid pacific classes being run at 280 psi at 750 degrees F., superheated.

 ;) ;)

I hate dislike steam! It can be nasty stuff - as your photo shows - it used to amaze me in my days of the Grey Funnel Lines when people, who should have known better, would go searching for superheated steam leaks with the back of their hand! :o
We used to steam at 550psi 850oF
And they are reluctant to work on the wet soggy low pressure stuff we have at work.  ;)  ;)  :y
Title: Re: Piston trouble.....
Post by: Lizzie_Zoom on 06 June 2009, 20:26:32
Quote
Quote
Quote
Ooops!
I've never really thought about it before, but what kind of steam pressures & temps are we talking about from a stm train loco?

In English units please!  ;)  ;)  ;)

On average, depending on the type of engine you are talking about 250 psi at 405 degrees fahrenheit, but 300 degrees higher if using superheated steam, with say bulleid pacific classes being run at 280 psi at 750 degrees F., superheated.

 ;) ;)

I hate dislike steam! It can be nasty stuff - as your photo shows - it used to amaze me in my days of the Grey Funnel Lines when people, who should have known better, would go searching for superheated steam leaks with the back of their hand! :o
We used to steam at 550psi 850oF
And they are reluctant to work on the wet soggy low pressure stuff we have at work.  ;)  ;)  :y


Yes Andy, it must be treated with great respect! ;) ;)

Your great fear on the footplate, apart from blowbacks from the firebox, is that the drain cocks are not fully opened with steam blown through, before applying the regulator after a stop. 

Any water in the cylinder can destroy it, or at least blow the cylinder covers off, when the piston pushes against said water, as water cannot be compressed!!  Very nasty!! :o :o :'( :'( :'(
Title: Re: Piston trouble.....
Post by: Martin_1962 on 06 June 2009, 20:44:07
Very expensive

New casting required
Title: Re: Piston trouble.....
Post by: Vamps on 06 June 2009, 20:48:27
It's OK it's old, think of the scrap value......... :y




Title: Re: Piston trouble.....
Post by: Kevin Wood on 06 June 2009, 20:59:12
Quote
Ooops!
I've never really thought about it before, but what kind of steam pressures & temps are we talking about from a stm train loco?

In English units please!  ;)  ;)  ;)

Nothing in comparison to what's going on in a car engine, but if something goes wrong, it 'aint going to stop.

The mind boggles at the sort of forces that must have been involved in that failure. I doubt those connecting rods bent desperately easily. :o

Kevin
Title: Re: Piston trouble.....
Post by: ally_cover_expert on 06 June 2009, 21:01:55
Pissed and broke :)