Every machine is unique
When procuring a new Mobile Bulk Materials Handling Machine (BMHM), such as a bucketwheel reclaimer, stacker reclaimer, stacker, bridge/portal-type reclaimer or ship loader, the machines configuration will depend on many factors:
Required throughput;
Stockpile layout and footprints;
Yard conveyor arrangements;
Bund or wharf rail gauge;
Properties of the material to be handled.
It would therefore be very unlikely to find an “off-the-shelf design” that would suit all the required design parameters for a particular mine or port site.
Higher rates of structural failure
A new BMHM is a major capital expenditure asset with an expected design service life of 25+ years, however, they experience a higher rate of structural failure when compared to other heavy industrial structures.
Historical evidence shows that catastrophic structural failures can occur at any time during a machine’s service life, including during the commissioning stage.
Safety and cost benefits
Engaging an independent or third-party design reviewer during the early stages of procurement can provide many benefits:
Implement “Safety in Design” early in the design phase;
Satisfies legislative requirements (duty of care / due diligence);
Anomalies in the machine configuration and potential constructability issues can be identified and notified to the supplier (OEM) early in the design phase;
Design code compliance issues can be identified in the design phase and promptly rectified;
Costly production delays due to design issues and associated on-site remedial work can be minimised;
Identifying design issues early in the design phase minimises cost overrun and schedule delay;
Structural modifications can be incorporated during fabrication without undue cost or schedule penalty;
Minimise the risk of commercial and/or legal disputes which potentially lead to expensive litigation.
Prevention is better than Remediation
LEC personnel have undertaken independent detailed design reviews, structural condition assessments and failure investigations for more than 50 bulk materials handling machines since 1993. Often this involved detailed Finite Element Analysis (FEA) using 2D and 3D elements.
Based on our experience, the detailed design review often identifies structural design issues related to:
Safety in Design;
Omissions and ambiguities in the Technical Specification documents;
Materials and constructability issues;
Serviceability issues;
Member strength issues;
Member and local plate buckling issues;
Fatigue service life compliance.
These design issues can generally be resolved with the Original Equipment Manufacturer (OEM) during the design phase, thus eliminating potential schedule drift and cost overruns.
An independent detailed design review can be carried out in accordance with the following standards, generally nominated in the client’s technical specification for the new Bulk Materials Handling Machine:
Australian Standard AS 4324.1
FEM Section II (2 131 / 2 132)
ISO 5049-1
Click here to contact LEC and discuss your requirements for an evaluation of a machine’s technical specification and an independent design review.
