Tub Specification, Design, Inspection and Auditing
Dragline tubs or bases are the foundation of the machine and although they are tolerant of quite extensive damage, maintenance is difficult and can be minimized with good design. As large walking draglines have been in operation around the world since the early 1970’s (and in small numbers well before that) there is considerable history.
Using a combination of analytical stress analysis, historical performance of various tub designs and weld fatigue principles CMP Engineers has developed specifications, undertaken design audits, executed design modifications, provided QA advice during manufacture and inspected operational tubs for remnant life and maintenance strategies for several draglines.
Specific projects include: Marion 8050 and BE 1370W new tub specifications, stress analysis of a proposed cable entry modification to reduce handling of the connector/plug, review of the OEM proposed bolting arrangement on a new rack, risk analysis and maintenance strategy for extending the life of operating tubs.