Techspecs

HDPE Idlers Self Noise Testing

1 INTRODUCTION

Heggies Pty Ltd (Heggies) was commissioned by Longwall Advantage Pty Limited to measure the Sound Power Level (SWL) of HDPE conveyor idlers.

2 SUPPLY SPECIFICATIONS

The aim is for the self noise of the idlers to achieve the design Sound Power Levels shown in Table 1.

Table 1	Idler-Roll Self Noise Overall Sound Power Level Criteria
Idler-Roll Length Range	Overall Sound Power Level (dBA re 1 ρW)
500 mm - 800 mm	67 dBA
801 mm - 1100 mm	68 dBA
1101 mm - 1500 mm	69 dBA

This report details the results of a type test, where three of each idler-roll type were selected at random and tested on a suitable test rig. It should be noted that the purpose of the test was to quantify the idler self noise when such rolls are operated at their design speed.

5 TEST RESULTS AND COMPLIANCE STATEMENT

Table 2 shows the results for each test as well as the resulting maximum sound power level of the idler-roll type test. The results include the extraneous noise from the motor, and hence, are not within the accuracy tolerance stated in Section 4.3.

Table 2	Idler-Roll Type SWL Test Results (dBA re 1ρW)
Idler-Roll Type Description	Total Measured SWL for 3 Idler-Rolls	SWL for Single Idler Roll Supply	SWL Criteria
900mm HDPE Idler (Black) Part No. EuR 152/900	57.4 dBA	52.6 dBA	68 dBA
Note 1: All idler-rolls diameter 152 mm. Note 2: All idler-rolls tested at design rotational speed 640 rpm.

5.1 COMPLIANCE STATEMENT

The results presented in Table 2 demonstrate that the SWL of the HDPE idler-roll type tests clearly comply with the noise design goal.

I trust that the preceding provides sufficient detail for your current requirements. If you require any further information please contact me on phone 4908 4500 or email rod.linnett@heggies.com.au