Copyright © 2015-16 Stan Bell. All rights reserved.   stan.bell@systemsoft.co.uk

NVR 40t Steam Crane


Radius


Propped


Unpropped


20’


36 Tons


12 Tons


30’


24 Tons


6 Tons


40’


18 Tons


3.5 Tons

Lifting Capabilties


The lifting capacity depends on the distance the jib must reach to the object being lifted and on whether the crane is propped or not.  


When not propped, (known as ‘Free On Rail’), capacity is greatly reduced.


When built, the figures were










But these were revised in 1939 to allow lifts up to 40 tons at 18’ radius.


Further changes, possibly also in 1939, reduce the permitted loads at maximum range by about 20%, so the values we work with today are



















A plate on each side near the base of the jib shows the current radius and the loads that can be taken at that range.


Radius


Propped


Unpropped


18'


40 tons



20’


36 Tons


12 Tons


30’


24 Tons


6 Tons


40’


15 Tons


2.75 Tons