Muswellbrook Coal Company

Transcription

1 Muswellbrook Coal Company Mining Plant Sound Power Survey 2016 Prepared for Muswellbrook Coal Company

2 Page i Muswellbrook Coal Company Mining Plant Sound Power Survey 2016 Reference: 16155_R02 Report date: 27 July 2016 Prepared for Muswellbrook Coal Company PO Box 123 Muswellbrook NSW 2333 Prepared by Global Acoustics Pty Ltd PO Box 3115 Thornton NSW 2322 Prepared: Jonathan Erasmus Acoustic Technician QA review: Ryan Bruniges Scientist(Acoustics) Global Acoustics Pty Ltd ~ Environmental noise modelling and impact assessment ~ Sound power testing ~ Noise control advice ~ Noise and vibration monitoring ~ OHS noise monitoring and advice ~ Expert evidence in Land and Environment and Compensation Courts ~ Architectural acoustics ~ Blasting assessments and monitoring ~ Noise management plans (NMP) ~ Sound level meter and noise logger sales and hire

3 Page ii Table of Contents 1 INTRODUCTION Terminology TESTING METHODOLOGY Equipment Used RESULTS CLOSURE...6 Appendices A CALIBRATION CERTIFICATES...7 B SOUND POWER RESULTS C SOUND POWER RESULTS COMPARISON D SOUND POWER SINGLE & ONETHIRD OCTAVE GRAPHS...16

4 Page 1 1 INTRODUCTION This report provides sound power (LW) data for mobile equipment owned and operated by Muswellbrook Coal Company (MCC) MCC have established an equipment noisemonitoring program to comply with requirements of the MCC Noise Management Plan (February 2005). This report presents the results of a sound power testing survey undertaken in July Terminology Definitions of terminology, which may be used in this report, are provided in Table 1.1. Table 1.1: TERMINOLOGY & ABBREVIATIONS Descriptor Definition db Decibels. For sound pressure level this is 10 times the logarithm to the base 10 of the ratio of the meansquare sound pressure to the square of the reference sound pressure (20 micropascals) db(a) Noise level measurement units are decibels (db). The A weighting scale is used to describe human response to noise. SPL Sound pressure level (SPL), fluctuations in pressure measured as 10 times a logarithmic scale, the reference pressure being 20 micropascals. LW Linear sound power level, expressed in decibels, is the logarithmic ratio of the sound power of a source in watts (W) relative to the sound power reference base of 1012W LWA Aweighted sound power level. LAeq The average Aweighted noise energy during a measurement period, in db

5 Page 2 2 TESTING METHODOLOGY Measurement and calculation was conducted with a reduced scope version of the following standards: AS 'Acoustics Measurement of airborne noise emitted by earthmoving machinery and agricultural tractors Stationary test condition Determination of Compliance With Limits for External Noise'; and ISO 6395 'Acoustics Measurement of exterior noise emitted by earthmoving machinery Dynamic test conditions'. The reduced scope uses fewer microphone positions than specified in the standards, with only ground positions used. The rationale behind this is to increase mobility of the testing team, flexibility in choice of testing location, and to minimise disruption to mining production. The test is mainly used as a screening tool, a more precise equipment sound power that would result from adherence to the above standards was not required. A minimum of two test runs were recorded for each plant item with the aim to have less than 1.5 db difference between results. It is considered that the results are of sufficient accuracy and repeatability for the purposes of this survey. The tests conducted during the 2016 survey were undertaken using a dynamic test, where the plant item passes through the test area under full power on level ground. For trucks this was modified to include uphill under power, and downhill under retard tests to simulate normal hauling activities. The measurement is commenced and completed when the plant item (centre of) passes between microphone positions 2 & 3 and 1 & 4 respectively. For this survey positions 1 & 2 were tested during uphill testing, which corresponded with truck testing done in Stationary testing was conducted on the wash plant and diggers, and involved measurement at a known distance and the machine at high idle. Typical test areas are presented in Figure 1 and Figure 2.

6 Page T ra v e l p a th o f m a c h in e IS O m ic r o p h o n e p o s itio n s 4 3 Figure 1: Sound Power Microphone Positions 1 3 F ro n t o f m a c h in e 7 5 A S m ic r o p h o n e p o s itio n s Figure 2: Alternate Stationary Sound Power Microphone Positions Typically for mobile plant items the test area radius ('R in Figures 1 and 2) was 20 metres. This was varied to suit larger items undergoing normal operation (e.g. excavators, crusher). For static tests, fewer microphone positions than presented in Figure 2 were used when the test area was obstructed (e.g. accessible locations for crusher).

7 Page Equipment Used The equipment used to measure and record noise levels are listed in Table 2.1. Calibration certificates are provided in Appendix A. Table 2.1: SOUND LEVEL MEASUREMENT EQUIPMENT Model Serial Number Calibration Due Date SVAN 958 noise and vibration analyser /03/2017 Rion NC74 sound level calibrator /11/2016

8 Page 5 3 RESULTS During this sound power testing survey, 12 plant items were tested. Sound power results are presented in Appendix B. A comparison of sound power results between 2014, 2015 and 2016 surveys are presented in Appendix C. Single and onethird octave graphs, which can be useful in identifying noise sources, are presented in Appendix D. We trust this information is per your requirements. Please contact us if you require further details or advice. Global Acoustics Pty Ltd

9 Page 6 APPENDIX A CALIBRATION CERTIFICATES

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12 Page 9 APPENDIX B SOUND POWER RESULTS 2016

13 Page 10 SOUND POWER RESULTS 2016 Plant ID Make/Model Test Date Test Type LWA (db) LW (db) Notes 209 Hitachi /07/2016 Stationary Caterpillar 777D 04/07/2016 Uphill, Loaded /07/2016 Uphill, loaded /07/2016 Downhill, loaded /07/2016 Uphill, loaded /07/2016 Downhill, loaded /07/2016 Uphill, loaded /07/2016 Downhill, loaded /07/2016 Uphill, loaded /07/2016 Downhill, loaded /07/2016 Uphill, loaded /07/2016 Downhill, loaded /07/2016 Uphill, loaded /07/2016 Downhill, loaded /07/2016 Uphill, loaded /07/2016 Downhill, loaded /07/2016 Uphill, loaded /07/2016 Downhill, loaded CAT D10T 25/07/2016 1st Gear, Forward CAT D10T 25/07/2016 1st Gear, Reverse 118 Excavator Trucks Dozers

14 Page 11 SOUND POWER RESULTS 2016 Plant ID Make/Model Test Date Test Type LWA (db) LW (db) Notes 1437 CAT D10T 25/07/2016 2nd Gear, Forward CAT D10T 25/07/2016 2nd Gear, Reverse CAT D10T 25/07/2016 1st Gear, Forward CAT D10T 25/07/2016 1st Gear, Reverse CAT D10T 25/07/2016 2nd Gear, Forward CAT D10T 25/07/2016 2nd Gear, Reverse Notes: 1. "-" denotes information is not available

15 Page 12 APPENDIX C SOUND POWER RESULTS COMPARISON

16 Page 13 SOUND POWER COMPARISON Plant No. Make / Model Test Type 2014 Results 2015 Results 2016 Results1 LWA (db) LW (db) LWA (db) LW (db) LWA (db) LW (db) 2015 to to 2016 Change in Change in LWA(dB) LW(dB) Trucks 17 Caterpillar 777D Uphill, Loaded Uphill, Unloaded Downhill, Unloaded Uphill, Unloaded Downhill, Unloaded Uphill, Unloaded Downhill, Unloaded Uphill, Unloaded Downhill, Unloaded Uphill, Unloaded Downhill, Unloaded Uphill, Unloaded Downhill, Unloaded Uphill, Unloaded Downhill, Unloaded Uphill, Unloaded Downhill, Unloaded

17 Page 14 SOUND POWER COMPARISON Plant No. Make / Model Test Type 2014 Results 2015 Results 2016 Results1 LWA (db) LW (db) LWA (db) LW (db) LWA (db) LW (db) 2015 to to 2016 Change in Change in LWA(dB) LW(dB) Dozers CAT D10T 1st Gear, Forward CAT D10T 1st Gear, Reverse CAT D10T 2nd Gear, Forward CAT D10T 2nd Gear, Reverse trucks were loaded and tested using 16m radius.

18 Page 15 APPENDIX D SOUND POWER SINGLE & ONE-THIRD OCTAVE GRAPHS

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