If you register, you can do a lot more. And become an active part of our growing community. You'll have access to hidden forums, and enjoy the ability of replying and starting conversations.

Boiler Preheaters

Discussion in 'Locomotive Engineering M.I.C' started by GSN, Feb 23, 2017.

  1. GSN

    GSN New Member

    Joined:
    Feb 10, 2015
    Messages:
    48
    Likes Received:
    56
    Gender:
    Male
    Location:
    Plymouth
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Hi I was looking at some diagrams of Bullied Merchant navy cabs and I see that it had firebox preheating valve below the foot plate on the boiler back-head near the foundation ring.
    Please could can any one enlighten me how this worked and would be practical for locos running on heritage railways to reduce thermal stress and operating costs on the boiler and firebox.
    I did also read some time ago that one the Swiss rack railways built some new steam locos with small electric element to bring the water temperature up about 10 degrees and I would interested hear how that worked out or was just for frost protection.
     
  2. Nigel Day

    Nigel Day New Member

    Joined:
    Mar 17, 2015
    Messages:
    69
    Likes Received:
    58
    Gender:
    Male
    Occupation:
    Steam loco engineer
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    The Swiss heaters where an external electrical immersion heater that then circulated hot water into the boiler. The principle reason was to pre steam a boiler automatically over night. The is could be switched on by phone is required.
     
  3. Jamessquared

    Jamessquared Resident of Nat Pres

    Joined:
    Mar 8, 2008
    Messages:
    11,243
    Likes Received:
    10,036
    Location:
    21C102
    DL Bradley notes, in "Locomotives of the Southern Railway", Vol. 2, the following about the first series Merchant Navies:

    "On account of the unusually high working pressure, it was considered necessary to supply steam to the class while standing on shed and when lit up from cold after washout. To provide this, withdrawn Adams 4-4-0 No. 657 was converted to a stationary boiler in February 1941 and despatched to Salisbury. Later Adams 0-4-2 No. 646 took over this task and No. 657 was transferred to Exmouth Junction. Both locomotives had their pistons and valve rods removed, modified brick arches fitted, and steam hose connections on the dome. No. 657 was in use at Exmouth Junction on 11 October 1942, raising steam on 21C9 Shaw Savill following a boiler washout, but when Salisbury was visited on 2 July 1943, No. 646 was lying derelict and appeared not to have been steamed for many months. Experience had shown that their use was quite unnecessary."

    Presumably the dates given were ones on which Bradley had visited those sheds, rather than a systematic listing.

    No. 646 (the Adams Jubilee) had been nominally withdrawn in May 1939 with fractured frames, but evidently hung around long enough on the scrap line at Eastleigh to earn a temporary reprieve as stationary boiler.

    No. 657 (the X6 4-4-0) was similarly withdrawn in September 1940, but again lasted long enough to be reprieved. After being found unnecessary as a stationary boiler, it was returned to Eastleigh in March 1944 and eventually broken up at Horley in November 1949. Incidentally - trivia alert - this was one of the locos that had a starring role in the Will Hay film "Oh! Mr. Porter".

    Tom
     
  4. guycarr360

    guycarr360 Well-Known Member

    Joined:
    Oct 4, 2005
    Messages:
    1,397
    Likes Received:
    225
    Gender:
    Male
    Location:
    Chester le Street County Durham
    UP Steam in USA, use either a hot water heater running water through the boiler, or steam on their boilers for a extended period of time, before the fire is lit, watched a video on it a while back, if I can find it on youtube, will post it.

    Always thought it made sense, and wondered why it was never done by mainline operators in the UK, however, I am sure it costs a bucket load.
     
  5. guycarr360

    guycarr360 Well-Known Member

    Joined:
    Oct 4, 2005
    Messages:
    1,397
    Likes Received:
    225
    Gender:
    Male
    Location:
    Chester le Street County Durham
    Found it :-



    From around 3 minutes in....
     
    GSN likes this.

Share This Page