Latest Articles

 

For Your Diary...

There are no upcoming events currently scheduled.
Primary Crusher Silencing
Summary of the work from Cemex have been doing to reduce noise from the Primary Crusher at Wickwar.  This work is progressive and is not complete as yet. 

Wickwar Primary Crusher radiates noise from several different sources.
Beyond some 10metres from the crusher these combine to give the impression of a single noise that can sometimes be heard in the village.

To reduce this noise in a cost effective manner individual sources must be tackled in descending order of loudness.
Tackling any lesser noise first would incur expense without apparent benefit.*
When the dominant source is reduced the next source reveals itself and so on...
,
A good analogy is what happens when peeling an onion: as each successive skin is removed another is revealed.
This technique has been employed on the primary crusher.

In the first phase of silencing Mr Frank Hogg (quarry manager) and his team have reduced noise by 13dBA on the 1st floor & 23dBA on the 2nd floor.
The result is that noise in the surrounding area has been reduced by 6dBA.**
They have done this enclosing the noisiest parts of the crusher.

Because noise energy cannot be ‘lost’, sound inside the enclosure has been mopped-up by absorbent material, a form of ‘acoustic blotting paper’!

So what does this mean to local residents?
A 6dBA reduction means the crusher noise output is now one quarter of what it was.
Had the total noise emanated from four smaller crushers instead of one single large machine then effectively three of them have been turned off1
Or putting it another way: instead of being 1600m from Wickwar village the crusher sounds as though it has been picked up and placed 3200m away, double the distance.***
One person who has already expressed delight is Matt, the crusher operator, who sits high up in the portacabin watching the stone go by.
He says he now has a much more comfortable life!
A useful spin off is raised noise-awareness throughout the entire Wickwar team !

SO WHAT NOW?
Spurred on by success, Frank Hogg and his team have now embarked on peeling the second skin from the onion!

Information
* No matter how loud, if two simultaneous noises are 10dB apart then the lower one makes no contribution to the total level.

**A dBA is a unit of noise that takes account of how our hearing works. 6dBA is a useful reduction, 10dBA halves the loudness.

***The Crusher is a point-source whose level reduces by 6dB with each doubling of distance whereas a road is a line source that reduces by only 3dB with distance doubling
Views: 237

Comments (1)
RSS comments
1. 01-09-2007 16:12
 
Bold claims. 
WRAG have asked Cemex for the supporting evidence and sound report associated with the noise survey. To-date they have not been forthcoming.
Registered
  
Colin

Only registered users can write comments.
Please login or register.

Powered by AkoComment Tweaked Special Edition v.1.4.6
AkoComment © Copyright 2004 by Arthur Konze - www.mamboportal.com
All right reserved
 
< Prev   Next >
[ Back ]
PROTECT YOUR FAMILY GET QUOTE
Compare Online
Mortgage Payment Protection 		Cheap Insurance
Cheap Insurance
August 2008 September 2008
Su Mo Tu We Th Fr Sa
Week 31 1 2
Week 32 3 4 5 6 7 8 9
Week 33 10 11 12 13 14 15 16
Week 34 17 18 19 20 21 22 23
Week 35 24 25 26 27 28 29 30
Week 36 31

Planning Restriction Hours

Click here you view the Planning Restriction Hours

Important Contacts


The Planning Inspectorate
Room 3/18b,
Kite Wing
Temple Quay House
2 The Square
Temple Quay
Bristol
BS1 6PN

(Or via the website ) 

Frank Hogg – Wickwar Quarry Manager
Office: +44(01454)294521
Fax: +44(01454)299101
Mobile: +44(07909)890419  
Address: Wickwar Quarry
The Downs Road
Wotton-Under-Edge
Gloucestershire
GL12 8LF  
E-Mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Steve Webb MP

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
Phone: 01454 322 100
Address:
Poole Court
Poole Court Drive
Yate
Bristol
BS37 5PP

Howard Gawler – Wickwar (Ladden Brook) Ward Councillor
E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
Address:
Shale Cottage
Wotton Road
Iron Acton
S Glos BS37 9XE

Simon Ford – S. Glos. Planning Case Officer
Senior planning officer for minerals & waste
Address:
Planning Department
South Glos Council
Civic Centre
High Street
Kingswood
BS15 9TR
E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Neil Higgs - S. Glos. Environmental Health Officer
Address:
South Gloucestershire Council
Castle Street
Thornbury
BS35 1HF  
Tel  01454 863486
E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Mark Davies – S. Glos. Planning manager (Minerals & Enforcement)
Address
The Civic centre
High Street
Kingswood
S. Glos. BS15 9TR
Tel: 01454 864969
E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Pat Trull – Wickwar Parish Council Clerk
Phone: 01454 299120
E-mail:  This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Latest Poll

Have you taken action?
 

Who's Online