Strategies to change pool components for a hydraulic drills

Agenda

1. Introduction

2. Developed methodology

3. Results

4. Conclusions & limitations

1/23

Agenda

1. Introduction

2. Developed methodology

3. Results

4. Conclusions & limitations

1/23

1. Introduction

In a pool of components for a fleet of

hydraulic drills Identify the strategy of

change that has the best value costs per

hour & Machine shutdown hours

2/23

1. Introduction

This study was done over:

• 4 hydraulic drills

• 5 year history information

• 16 types of components

• 103 record of changes to components

3/23

Agenda

1. Introduction

2. Developed methodology

3. Results

4. Conclusions & limitations

4/23

2. Developed methodology

• Identify useful life & costs of the new components & repaired

• Acquisition costs, inventory & transports

• Define machine shutdown hoursrequired to change the component

5/23

2. Developed methodology

• Repairs considered by the dealer & alternative suppliers

• This methodology does not considercosts related to loss of profit causedby unavailability

6/23

2. Developed methodology

7/23

¿ How do they evolve in time

the frequency of change of

new components & repaired?

REPAIRED STOCK

0 5.000 10.000 15.000

15.000 20.000 25.000 30.000

Summary : In 30.000 hour we have 4 shutdowns & 4 expenses forrepaired components 8/23

Hour

Hour

NEW STOCK

0 5.000 10.000 15.000

15.000 20.000 25.000 30.000

Summary : In 30.000 hour we have 2 shutdowns & 2 expenses forpurchase of new component

SCRAP

9/23

Hour

Hour

2. Developed methodology

We must minimise the following function:

Costs component, new & repaired_____________________________________________________________________________________________________________________________ __________________________________________________________________________________________________

Life component, new & repaired

But, conditioned to

machine shutdown hours

10/23

Agenda

1. Introduction

2. Developed methodology

3. Results

4. Conclusions & limitations

11/23

3. Results

Results cost per hour & machine

shutdown hours of operation pool

component alternatives significantly

vary for component new or repaired

12/23

3. Results

Two dimention graphic if we

consider:

Axis X: Dollar per hour (US$/hour)

Axis Y: Machine Shutdown hour

(hour)13/23

300

400

500

600

700

800

900

1.000

1.100

1.200

15 18 20 23 25 28 30

Dollar per hour (US$/hour)

Mac

hin

e S

hu

tdo

wn

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(ho

ur)

Tactics restoration component pool

300

400

500

600

700

800

900

1.000

1.100

1.200

15 18 20 23 25 28 30

2006

Dollar per hour (US$/hour)

Mac

hin

e S

hu

tdo

wn

ho

ur

(ho

ur)

Tactics restoration component pool

2011

1.- Accessibility of components in equipment2.- Components that should be changed as a whole

according to technical recommendations3.- Availability and lead time of new and repaired

components

Punto C

Punto B

3. Results

Type Dollar per hour (US$/hour) Shutdown hour (hour)

First Tactic 22,94 1.052

New Tactic 19,34 546

Prior results can be seen in the followingtable

Begin tactic

New tactic

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15 % 506 hour

Agenda

1. Introduction

2. Developed methodology

3. Results

4. Conclusions & limitations

17/23

4. Conclusions

• The new tactic estimatedperformance 19,34 dollar per hourfor a fleet

• This new option estimatedperformance 546 machine shutdownhours for a fleet of hydraulic drills

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4. Conclusions

• The new tactic estimated availabilityincrease of 1,5 to 2,0 % for a fleet

• The new tactic estimated expense reduction of about 60.000 dollar a year for a fleet

19/23

4. Conclusions

• This study recommendations use pump & motor hydraulic new

• This study recommendations use cylinder hydraulic repaired

• In the case rotary head recommendation use repaired

20/23

4. Limitations

• This methodology does not considercosts related to loss of profit causedby unavailability

• There is a limited amount of information of new component and repaired

21/23

4. Commentaries

• Nevertheless, limited informationexisting, give us the first tendenciesuseful life and costs for the differenttype of restorations (new &repaired) for pool components

22/23

Thanks You

Very Much!!!

23/23

Víctor Barrientos Boccardo

Mine Maintenance Advisor

Skype : victor.barrientos.boccardo

Celular : 99424322