https://www.linkedin.com/feed/update/urn:li:activity:6304855423170248704 A seeding presentation to the mining engineering community to address the corossion and pitting problem. This proble often decreases equipment life by 20 -35% at wet mines as compared to dry mines. ps : as always , thanks to contributors 'quoted' from whose works learning are drawn.

1. Presentation for HEMM
community meet
By
Sandeep Gupta
Dated 27th Aug’2016

2. Safety Contact
Positional analysis of the operators
and maintenance crew is an
important PART of the FSIPP

3. Focus on Asset life cycle
management

4. A ‘Learnt to live with’ problem with mining equipment at
Under ground mine is that of severe corossion and
pitting on cylinder rods due to dripping water from mines
on the equipment. This reduces life of mining equipment
to half as compared to ‘dry’ mine within company.

5. Best practices in corrosion
mitigation from other industries
such as De ice Agencies in cold
countries, marine engineering
and Military.

6. Manual for the de icer equipment
corrosion protection
Excerpts

7. De icer equipment also faces
heavy corrosion due to chloride
content of the de icing salts

8. RAGAGEPS for Mining equipment corrosion Management
1
Types of corrosion: Galvanic, abrasion corrosion, Stress corrosion cracking, Microbes
Induced Corrosion(MIC), Sulphide stress corrosion cracking
2
It is important to learn the water has which chlorides, rather than only the total chloride
count. Each type of chloride has different corrosion rates. (example FeCl3 has only
about one sixth of the corrosion rate as that of NaCl and HCl at same temperature and
chloride %) .
3
Check/Audit joining surfaces of dissimilar metals and ensure insulation in between to
prevent galvanic corrosion.
4
Companies like TCR Eng, Vadodara, SGS-USA through India, VpCl technology by Cortech
for mining equipment can help us test type and extent of rust and corrosion and
develop CCP according to it.
5
Parts of the vehicles which are exposed to maximum corrosion in sequence are -
Chassis, Electricals, fittings, brake liners, …..
6
Engage with OEMs in corrosion protection programs also so that they take tailoring of
MOC , Surface protection design
7
Chassis and body design to avoid water and humidity accumulation, check the design
(after it arrives from OEM to our mines) and do some small alterations if required
8 Daily washing is a must for equipment
9
Washing station with luke warm water, high flow and low pressure is required, grease
should not be washed away
10
Washing check sheet is generally not developed, it is a must (specially for listing of
difficult to reach/clean spots)

9. RAGAGEPS for Mining equipment corrosion Management
11
Corrosion of electrical is often neglected : Dielectric grease for electrical, so that water
does not penetrates the cables
12 Audit/check for and avoid sharp edges to minimise breakage of the wires and cables
13 MTVR DASH BOARD COVERS
14 Modified protective cover for batteries
15 Caulk the weld and then paint
16 Develop and implement corrosion control plans
17
Vapour corrosion inhibitors usage, specially in engine box and exhaust route. ‘GORE’
Protective Vents for keep the electronic components
18
OEMs do repainting of the vehicles, best practice is to ask for a corrosion control plans,
have services of agencies for the vehicle reconditioning.
19 Fluid film application is another tools for the CCP
20 Canopy is used on the drill jumbo to prevent drill water spillage on the HEMM.

10. RAGAGEPS for Mining equipment corrosion Management
21 Aluminium fuel tanks are used by many, we have tried removable protective covers and ….
22 Brakes checking is important for the corrosion
23 Poly tandem Fender guards
24 Prevent bearings and bushes lubrication wash off – that can withstand water.
25 Use of marine grade corrosion inhibitors. Examples Samarco Oxi free coatings
26
Innovations such as ‘Intercept technology’ for corrosion prevention can be used for the
mining equipment and mine drill samples as well.
27 E coating of the reinforced rails (double rails if any)

11. 1
Current practice – application of a hydrophilic / water repellent grease and reconditioning of
hydraulic cylinder from a Ahmedabad party (for new cylinders).
2
Hydraulic seals developed for coal mines roof support system, these seals could be use full
for us as well.
3
MILITARY standard for corrosion prevention and manual, page 30 is quoted below for ready
reference:
5 alternative processes
– Enhanced chrome with TiN topcoat over chrome
– Enhanced chrome with thin dense chrome (United Chrome)
– Nano particle Co-P-Si-C – NiB
– Ferritic nitro-carburizing with and without TiN topcoat
4 New practice/innovation : Laser cladding protection of hydraulic cylinders .
Problem of corrosion at hydraulic cylinders of the equipment

12. Specification of surface preparation for HEMM
We at present have 3 coat system but not the grit blasting system (specially in re
painting specification – same to be added).

13. Specification of surface preparation for HEMM

14. Specification of surface preparation for HEMM

15. Way Forward
1
Engine life monitoring – Rio Tinto program to enhance life by adding sensors at
appropriate points to the engines . Sensors added to RAOC dumpers gear train
engine to increase life span. Take up the program forward to increase the life.
2
Recent order by xxxx for the xxxxxxx drill jumbos has additional innovations
supporting the productivity by increase in split drifter stroke length. More such
tailoring of the equipment specification should be explored by other mines as
suited to them.
3
Drill jumbo specifications for narrow vein mines to be taken further with xxxxx
and xxx mines .
4 Tire life management practices and developments to be horizontally deployed.
5
xxx Oil laboratory has been commissioned , its potential use for extending oils
life span in a methodical way has to be done.
6
Some mining equipment manufacturers take up tailor made multipurpose utility
mining equipment. Explore the same. Example M/s Marcottmining makes
equipment which carries pipes, handles pipes, small ventilation fan, etc.

16. Thanks