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Good Practices on Pumping System Noise Control

The inclusion of any information of any company or product or reference to brand names of any particular product in this booklet does not in any way imply recommendation or endorsement by the Government of Hong Kong Special Administrative Region (the Government). The inclusion or reference is for demonstration purpose only and the non-inclusion of any product or company herein shall not be construed as disapproval of the product or company by the Government. The data regarding any product herein have been certified to be accurate by relevant manufacturers or their authorized agents or representatives. However, no warranty or guarantee whatsoever is or shall be construed as being given by the Government in respect of any product referred to herein. Readers are advised to seek independent experts or technical advice regarding the operation, use, installation, maintenance or otherwise of any product referred to herein.

CONTENTS

1. INTRODUCTION
2. QUICK REFERENCE GUIDE
3. PLANNING AGAINST NOISE PROBLEMS
 
3.1 Positioning of Equipment
3.2 Selection of Quiet Equipment
3.3 Scheduled Maintenance
4. PROBLEMS AND PRACTICAL REMEDIES ON PUMPING SYSTEM NOISE
 
4.1 Air-borne Noise from Ringing Pipes
4.2 Structure-borne Noise from Pipes
4.3 Air-borne Noise from Pumpsets
4.4 Structure-borne Noise from Pumpsets
4.5 Important Note
5. RECOMMENDED PRACTICAL REMEDIES FOR DIFFERENT EXCEEDANCE LEVELS
6. GLOSSARY OF ACOUSTIC TERMINOLOGY

APPENDICES

I. STATUTORY CONTROL OVER NOISE
II. NOISE PREDICTION
III. TYPICAL SOUND POWER LEVELS OF PUMPSETS
IV. COMPLETE ENCLOSURES
V. PARTIAL ENCLOSURES
VI. BARRIERS
VII. INERTIA BLOCKS
VIII. VIBRATION ISOLATORS
IX. SILENCERS
X. ACOUSTIC LOUVRES
XI. SOUNDPROOF DOORS
XII. VIBRATION IDENTIFICATION GUIDE
XIII. EXAMPLES OF PRACTICAL NOISE CONTROL MEASURES
XIV. REFERENCE
XV. OTHER RELEVANT NOISE CONTROL MATERIALS
XVI. ADDRESSES AND TELEPHONE NUMBERS OF ENVIRONMENTAL PROTECTION DEPARTMENT'S OFFICES

LIST OF FIGURES

Figure 1 Inertia Block, Spring, Isolation Pad and Flexible Connector
Figure 2 Noise from Ringing Pipes
Figure 3 Large Radius Bend and Pipe Lagging
Figure 4 Noise from Vibrating Pipes
Figure 5 Vibration Isolation of Pipes
Figure 6 Air-borne Noise from Pumpsets
Figure 7 Barrier for Pumpsets
Figure 8 Complete Enclosure for Pumpsets
Figure 9 Plantroom for Pumpsets
Figure 10 Structure-borne Noise from Pumpsets
Figure 11 Vibration Isolation of Pumpsets
Figure 12 Partial Enclosures
Figure 13 Barriers
Figure 14 Metal Springs
Figure 15 Isolation Pads
Figure 16 Silencers
Figure 17 Acoustic Louvres
Figure 18 Examples of Noise Control Measures

LIST OF TABLES

Table 1 Quick Reference Guide
Table 2 Recommended Practical Remedies
Table 3 Acceptable Noise Level (dB(A)), at 1m from Facade
Table 4 Acceptable Noise Level (dB(A)), at an Internal Location
Table 5 Distance Attenuation at Given Distances
Table 6 Summation of Noise Levels
Table 7a Typical Sound Power Levels of Pumpsets at 3600 rpm
Table 7b Typical Sound Power Levels of Pumpsets at 1800 rpm
Table 8 Sound Insulation Materials for Enclosures
Table 9 Guide for Inertia Block Selection
Table 10 Minimum Static Deflection for Various Speeds of Machines
Table 11 Sound Transmission Class of Doors
Table 12 Vibration Identification Guide

 
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Last Revision Date : 06 May 2008