needed – within energy dissipation
limits - to fully unload the conveyor
before maintenance work commences.
“Mine operators believe, with the
use of the RDBK, a conveyor will be
held in place regardless of an event
failing,“ the company said in a press
release. ”Also offloading the conveyor
is a less complicated process, which
permits maintenance work to be
completed quickly and reduces
downtime.“
Replacing fatigued
dragline boom clusters
BMT WBM has deployed its
DuraCluster modification and repair
scheme at a major opencast coal mine,
replacing a number of fatigued boom
clusters. According to the company,
the system improves the fatigue
performance of cluster joints on
existing tubular dragline boom
designs.
After the DuraCluster has been
installed, it lowers maintenance and
inspection workloads and also reduces
the problem of long-term fatigue
cracking associated with the existing
cluster design.
The log booms of draglines
comprise a number of tubular chords
with interconnecting lacings welded to
the chords at cluster joints. Stresses are
concentrated at the cluster joint
weldments and, over time, fatigue
cracking becomes endemic. BMT’s
methodology prevents the need to cut
and replace windows in lacings by
removing the problematic design
detail and improving load paths.
Furthermore, DuraCluster can extend
the fatigue life of dragline booms by
reducing the stress concentrations.
“A boom replacement can cost in the
region of US$20 million and would
require a three month machine outage,”
explained Charles Constancon, Director
of Canadian Services at BMT WBM.
“With BMT’s modification and repair,
the cluster design can be upgraded in
around one week per cluster,
depending on the extent of chord repair
required, while multiple clusters can be
modified simultaneously. With
equivalent repair costs reduced to
approximately US$2 million, this is an
extremely attractive incentive for
mining companies. While DuraCluster
provides a step change in life to
cracking for tubular boom construction,
it is equally applicable to tubular
masts.”
ABB
4
J.H. Fletcher & Co.
39
AIMEX
49
Joy Global
2
Ampcontrol
41
Liebherr
57
BASF
17
Loesche
IFC
Cincinnati Mine Machinery
36
McLanahan
74
Classic Motors
54
MMD
13
Coaltrans Japan
69
Motion Metrics
7
CSL Group
11
Peterson Filters
83
Derrick
OFC, 71 Polydeck Screen Corp.
79
Heyl & Patterson
59
Realtime Instruments
63
IronPlanet
50
Sandvik
OBC
James A. Redding Co.
19
Siemens
9
Jennmar
IBC Swire CTM Bulk Logistics
21
Advertiser’s Index
88
|
World Coal
|
June 2015
