RE: Re; Boiler test

[Geoff Spenceley]

 Steve,

Agreed, It's spectacular to have the safety spitting and  lots of noise
from the stack but your idea is much preferred for satisfactory running and
duration.

Geoff.

This is my view point:
>On the surface more pressure is better, but what I have found is that for
>scale like and smooth operation more is not always better.  When operating
>at max pressure somtimes smooth starts and speed regulation can be erratic
>and jittery.   You do not always have enough fine control of the throttle
>valve for a smooth start at high pressure.  Some engines run better at a
>lower pressure, higher pressures can just cause excessive speed.  I prefer
>to run my trains at slower speeds and usually do not run very long trains.
>I have the same view point with my model steam boats also.  If you run the
>engine at lower pressures duration will increase.
>
>Steve
>
>
>> -Original Message-
>> From:[EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]
>> Sent:Wednesday, August 20, 2003 9:12 AM
>> To:  Multiple recipients of sslivesteam
>> Subject: Re; Boiler test
>>
>> Royce,
>>
>> Why not take advantage of your overdesigned and now tested boiler with a
>> 60psi relief valve?  At minimum you could still operate at 40psi without
>> waisting anything out the popoff.
>>
>> I am still scratching my head on this next part and throw it out to the
>> group for comments.  Assuming you have sufficiant gas for the additional
>> energy required and operate at the same speed, would you not get longer
>> runs from a given amount of water operating at 60psi versus 40psi?  As
>> this is presumably a geared loco, I would assume you would not need the
>> extra torque available from the higher pressure.  At a first glance it
>> seems logical as each cc. of water would have that much more energy when
>> converted to steam.  I am having difficulty understanding if this
>> additional energy is simply lost across the pressure drop at the throttle
>> or if it does make it to the piston. It has been too many years since I
>> have studied steam tables to draw a conclusion.
>>
>> Regards,
>>
>> Tom Burns


 

RE: Re; Boiler test

[Ciambrone, Steve @ OS]

This is my view point:
On the surface more pressure is better, but what I have found is that for
scale like and smooth operation more is not always better.  When operating
at max pressure somtimes smooth starts and speed regulation can be erratic
and jittery.   You do not always have enough fine control of the throttle
valve for a smooth start at high pressure.  Some engines run better at a
lower pressure, higher pressures can just cause excessive speed.  I prefer
to run my trains at slower speeds and usually do not run very long trains.
I have the same view point with my model steam boats also.  If you run the
engine at lower pressures duration will increase.

Steve


> -Original Message-
> From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]
> Sent: Wednesday, August 20, 2003 9:12 AM
> To:   Multiple recipients of sslivesteam
> Subject:  Re; Boiler test
> 
> Royce,
> 
> Why not take advantage of your overdesigned and now tested boiler with a
> 60psi relief valve?  At minimum you could still operate at 40psi without
> waisting anything out the popoff.  
> 
> I am still scratching my head on this next part and throw it out to the
> group for comments.  Assuming you have sufficiant gas for the additional
> energy required and operate at the same speed, would you not get longer
> runs from a given amount of water operating at 60psi versus 40psi?  As
> this is presumably a geared loco, I would assume you would not need the
> extra torque available from the higher pressure.  At a first glance it
> seems logical as each cc. of water would have that much more energy when
> converted to steam.  I am having difficulty understanding if this
> additional energy is simply lost across the pressure drop at the throttle
> or if it does make it to the piston. It has been too many years since I
> have studied steam tables to draw a conclusion.
> 
> Regards,
> 
> Tom Burns