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.

MHR Restorations and Overhauls

Discussion in 'Steam Traction' started by LN850, May 21, 2010.

  1. Duty Druid

    Duty Druid Resident of Nat Pres

    Joined:
    Jul 19, 2010
    Messages:
    9,578
    Likes Received:
    2,135
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Just how many 'friends groups' do we need & is there the stomach for them?.......

    BTW - hows the lines 'forgotten' loco - 75079 coming on?..... there hasn't been a blog for ages & surely that is a loco deserving of support in the short term to get her into traffic?..... 80150 & 34058 are but pipe dreams at the mo, though in the case of the latter, it wouldn't take long to put her back together given the kit of parts that arrived with her......
     
  2. steamvideosnet

    steamvideosnet Well-Known Member

    Joined:
    Apr 12, 2011
    Messages:
    1,545
    Likes Received:
    1,051
    Gender:
    Male
    Location:
    Southampton, UK
    Went in there a bit earlier Dave for a couple of hours, and it *looked* like it's really coming along with the boiler cladding back on. But I don't recall seeing a post anywhere saying that the boiler has a) been out of the frames or b) been steamed yet? A blog would be most welcome. I'm sure it will be a popular locomotive when she is eventually outshopped.

    James
     
  3. martin1656

    martin1656 Resident of Nat Pres

    Joined:
    Dec 8, 2014
    Messages:
    7,415
    Likes Received:
    4,263
    Gender:
    Male
    Location:
    St Leonards
    Heritage Railway Volunteer:
    No I do not currently volunteer
    the boiler hasnt been touched yet, the claddings being fitted just to ensure that once the boiler is done it is ready to go on, with the minimum of messing around , at least that was the answer i got last time i asked that question
     
    steamvideosnet likes this.
  4. steamvideosnet

    steamvideosnet Well-Known Member

    Joined:
    Apr 12, 2011
    Messages:
    1,545
    Likes Received:
    1,051
    Gender:
    Male
    Location:
    Southampton, UK
    Thanks for clarifying :)

    James
     
  5. martin1656

    martin1656 Resident of Nat Pres

    Joined:
    Dec 8, 2014
    Messages:
    7,415
    Likes Received:
    4,263
    Gender:
    Male
    Location:
    St Leonards
    Heritage Railway Volunteer:
    No I do not currently volunteer
    thats what i was told, does anyone in the know, know what condition the boiler is in? is the boiler on a standard 4, 4-6-0, the same as the 4 tank ?
     
  6. Swan Age

    Swan Age Active Member

    Joined:
    Sep 8, 2005
    Messages:
    830
    Likes Received:
    98
    Gender:
    Male
    Location:
    21C101 in the South West
    Heritage Railway Volunteer:
    No I do not currently volunteer
    I remember enquiring years ago about the boiler condition when the loco was at the Plym Valley Railway. I think it is pretty sound but may require a new tubeplate in the firebox as far as I can remember.
     
  7. 21B

    21B Well-Known Member

    Joined:
    Sep 2, 2009
    Messages:
    1,313
    Likes Received:
    1,062
    We will find out in due course I suppose. Because of the construction of standard locos it makes sense to finish just about everything before starting on the boiler because almost everything is hung off the boiler.
     
  8. OldChap

    OldChap Member

    Joined:
    Apr 29, 2007
    Messages:
    357
    Likes Received:
    100
    Occupation:
    adrift on the corporate sea

    All you need to know about BR 4 and 5 boilers :)

    The 75xxx class had BR4 pattern boilers, and 80xxx tanks were fitted with BR5 pattern boiler.

    The BR4 were very similar design to the BR5, the main differences being:

    BR4 Boiler pressure BR4 225psi / BR5 200psi

    Firebox staying was differed on each boiler type due to the differing pressures.

    BR4 boiler is physically longer (9 inches) and therefore cannot be fitted to a BR std cl. 4 2-6-4 tank (or any other BR std design)

    BR4 type manufactured total 88 - 80 locomotive (75000-75079) and 8 spares - 10% of class as works exchange units.
    6 BR4 pattern boilers exist today (6.75% of type constructed)

    BR5 type manufactured total 162 - 155 locomotive (80000 - 80154) and 7 spares - 4.5% of the class as works exchange units.
    15 BR5 pattern boilers exist today (9.25% of type constructed)

    BR4 boiler was found to be less efficient/successful than the BR5 type (initially at least) , its slightly bigger size did not produce the desired steaming rates required in traffic, as the the drafting/grate size ratio etc were the same between both types the logical step taken was to develop the double blast pipe to increase the steaming rate.

    75014 and 75027 retain the single blastpipe 75029, 75069, 75078, 75079 modified to double by BR. All BR5s have single blastpipe design.
     
  9. Steve

    Steve Resident of Nat Pres Friend

    Joined:
    Oct 7, 2006
    Messages:
    8,026
    Likes Received:
    2,164
    Occupation:
    Gentleman of leisure, nowadays
    Location:
    Near Leeds
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    You'd better tell all 80XXX owners to reduce their boiler pressure from 225 psi, then!
     
  10. Reading General

    Reading General Part of the furniture

    Joined:
    May 18, 2011
    Messages:
    5,297
    Likes Received:
    1,664
    how does the mogul boiler compare? (76017)
     
  11. OldChap

    OldChap Member

    Joined:
    Apr 29, 2007
    Messages:
    357
    Likes Received:
    100
    Occupation:
    adrift on the corporate sea

    The original design (based upon the LMS 4C pattern) was rated at 200psi. BR updated the design to 225psi
     
  12. OldChap

    OldChap Member

    Joined:
    Apr 29, 2007
    Messages:
    357
    Likes Received:
    100
    Occupation:
    adrift on the corporate sea
    The LMS Ivatt 4mt 2-6-0 had a 4D pattern boiler which BR based the BR7 boiler that was used on the BR std cl 4mt 2-6-0 76xxx class

    122 built (115 locomotive and 7 spares)

    Unlike the LMS version the BR7 pattern was successful out of the gate (the LMS version had drafting/steaming issues which included fitting/removing double chimney-blastpipes)
     
    Reading General likes this.
  13. std tank

    std tank Part of the furniture

    Joined:
    Sep 20, 2005
    Messages:
    3,085
    Likes Received:
    282
    Occupation:
    Retired
    Location:
    Liverpool
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    The only difference between BR4 and BR5 boilers is that the BR4 is 9" longer than a BR5. Where has the nonsense about different boiler pressures and stay patterns come from?
     
    26D_M likes this.
  14. 61624

    61624 Part of the furniture

    Joined:
    Sep 27, 2006
    Messages:
    3,531
    Likes Received:
    1,027
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    I think I'm right in saying that the major boiler/fireboxcomponents are common (i.e. backhead, throatplate, tubeplate ec. and that the NYMR has formers for all of them for use with its fleet of 4MT locos (75029/76079/80135/6).
     
  15. std tank

    std tank Part of the furniture

    Joined:
    Sep 20, 2005
    Messages:
    3,085
    Likes Received:
    282
    Occupation:
    Retired
    Location:
    Liverpool
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    76079's boiler and firebox are dimensionally different to the other locos.
     
  16. Matt37401

    Matt37401 Part of the furniture

    Joined:
    Jun 8, 2014
    Messages:
    5,667
    Likes Received:
    1,817
    Gender:
    Male
    Location:
    31A
    Heritage Railway Volunteer:
    No I do not currently volunteer
    Why would that be?
     
  17. std tank

    std tank Part of the furniture

    Joined:
    Sep 20, 2005
    Messages:
    3,085
    Likes Received:
    282
    Occupation:
    Retired
    Location:
    Liverpool
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Because 76079's boiler was similar to the boiler of the Ivatt 4, using the same flanging blocks. The boilers for the Class 4 4-6-0s and 2-6-4 tanks were similar to the boilers on the Stanier and Fairburn 2-6-4 tanks, using their flanging blocks, but the stay pattern was different to take into account the increased psi
     
  18. Matt37401

    Matt37401 Part of the furniture

    Joined:
    Jun 8, 2014
    Messages:
    5,667
    Likes Received:
    1,817
    Gender:
    Male
    Location:
    31A
    Heritage Railway Volunteer:
    No I do not currently volunteer
    Ok so not all the Standards were that Standard then?
     
    Wenlock likes this.
  19. Steve

    Steve Resident of Nat Pres Friend

    Joined:
    Oct 7, 2006
    Messages:
    8,026
    Likes Received:
    2,164
    Occupation:
    Gentleman of leisure, nowadays
    Location:
    Near Leeds
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Probably more so than the Black 5's.:)
     
    S.A.C. Martin, Matt37401 and std tank like this.
  20. Reading General

    Reading General Part of the furniture

    Joined:
    May 18, 2011
    Messages:
    5,297
    Likes Received:
    1,664
    can we have a separate thread for restoration projects at the MHR?
     

Share This Page