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Anonymous Poster #1

Acoustic Noise Insulation- Piping Orifice Plate

05/03/2016 12:33 AM

Hi,

I've one issue which is related to acoustic noise insulation. The application is for orifice plate piping. We need to insulate the pipe since the noise created is above from allowance noise.

Did anybody know how to calculate the noise insulation so that we can have the right insulation thickness and reduction of noise to meet the requirement?

Your reply on this subject will be highly appreciated.

thank you.

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Anonymous Poster #2
#1

Re: Acoustic noise insulation- piping orifice plate

05/03/2016 1:23 AM

I have an Excel Spreadsheet Calc that may help you out. Not sure how to get it to you ?

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#4
In reply to #1

Re: Acoustic noise insulation- piping orifice plate

05/03/2016 2:50 AM

maybe you can email it to me

From the CR4 Rules: Do not post phone numbers or email addresses. The CR4 Admin will delete all phone numbers and email addresses posted in threads or comments. You can share this information via the CR4 internal messaging system.

many thanks :)

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#6
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Re: Acoustic noise insulation- piping orifice plate

05/03/2016 3:14 AM

You should not post your e-mail unless you are prepared for the scam artists and malicious software senders to get your attention.

It will hopefully be deleted by admin.

That is hopefully for you!

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#2

Re: Acoustic noise insulation- piping orifice plate

05/03/2016 2:07 AM

The insulation provider should have the calculations needed....

http://www.armacell.com/WWW/armacell/INETArmacell.nsf/standard/1A2AFF22E0A3DA2EC1257D5F003BEFE6

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#5
In reply to #2

Re: Acoustic noise insulation- piping orifice plate

05/03/2016 2:55 AM

Is it applicable if I want to use fiberglass or mineral wool?

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#10
In reply to #5

Re: Acoustic noise insulation- piping orifice plate

05/03/2016 7:31 AM
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#15
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Re: Acoustic noise insulation- piping orifice plate

05/03/2016 11:33 AM
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#3

Re: Acoustic noise insulation- piping orifice plate

05/03/2016 2:39 AM

Check with the Department of Redundancy Department.

Acoustic noise is their special specialty.

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#16
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Re: Acoustic noise insulation- piping orifice plate

05/03/2016 11:03 PM

LOL!

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#17
In reply to #3

Re: Acoustic noise insulation- piping orifice plate

05/03/2016 11:40 PM

I was wondering if anyone was going to comment about that.

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#18
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Re: Acoustic noise insulation- piping orifice plate

05/04/2016 9:09 AM

The Department of Redundancy Department Committee for Department Council has determined that non-acoustic noise is permitted under Section 8 of the bylaws.

I think OP needs to go back to the orifice plate folks, and see what they did wrong, and why they have such a tiny orifice hole in their original orifice plate, and that is causing an extreme Reynolds number through said orifice, with a very high differential pressure. It is an extremely distasteful thing to simply put a patch (noise insulation) up over the real issue.

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#19
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Re: Acoustic noise insulation- piping orifice plate

05/04/2016 11:38 AM

Are you saying the OP should call the original orifice office official officer of orifice opening offence and be open with him about the opening and acoustics of the offending orifice?

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#20
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Re: Acoustic noise insulation- piping orifice plate

05/04/2016 11:49 AM

Absolutely, sounds like a lot of flatulence to m.

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#21
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Re: Acoustic noise insulation- piping orifice plate

05/04/2016 3:15 PM

In triplicate!

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#22
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Re: Acoustic noise insulation- piping orifice plate

05/04/2016 4:05 PM
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#23
In reply to #22

Re: Acoustic noise insulation- piping orifice plate

05/05/2016 8:25 AM

So that orifice building has all sorts of orifi associated with it?

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#24
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Re: Acoustic noise insulation- piping orifice plate

05/05/2016 9:00 AM

Yes.. And the rent is low because the view stinks.

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#25
In reply to #24

Re: Acoustic noise insulation- piping orifice plate

05/05/2016 11:50 AM

The view out some of those orifi could horrify. Having a stinky outlook is bad enough, but passersby will be gobsmacked, literally.

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#7

Re: Acoustic noise insulation- piping orifice plate

05/03/2016 6:00 AM

Yes. In Yellow Pages one will find a number of local noise insulation specialists who know so much about noise insulation they are selling it just to get rid of it. Pick up the phone, and talk to them.

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#8

Re: Acoustic noise insulation- piping orifice plate

05/03/2016 7:00 AM

In the water industry, orifice plate noise is an indication of cavitation and should be eliminated by proper design of the orifice plate to create smoothed flow.

You can easily muffle the noise, but the effect of cavitation could be eroding pipe wall section or the plate itself.

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#9
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Re: Acoustic noise insulation- piping orifice plate

05/03/2016 7:30 AM

Quite.

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#12
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Re: Acoustic noise insulation- piping orifice plate

05/03/2016 8:54 AM

GA. Took the words right off the top o' me brain!

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#11

Re: Acoustic noise insulation- piping orifice plate

05/03/2016 7:33 AM

'Orifice plate for flow' is so 1973. There are alternatives available that do not give rise to noise. Selection is based upon application, the details of which have been withheld from the forum.

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Anonymous Poster #2
#13

Re: Acoustic Noise Insulation- Piping Orifice Plate

05/03/2016 9:27 AM

A lot of great answers here, some will be complicated by vendors wanting to sell equipment. But all are very good solutions and went a lot further than my laziness allowed. Great job, glad to see the responses

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#14

Re: Acoustic Noise Insulation- Piping Orifice Plate

05/03/2016 11:16 AM

I hear there's a giant sucking sound coming from Washington D.C... I hope its not related.

I would look for water that is falling down the same riser. (if applicable) If there is enough volume and speed with the falling water it will create a vacuum in your pipe thus emptying p-traps etc. and creating that sucking sound. It's also a good idea to make all p-traps it's wet. I've encountered so many Ptraps that have just dried from evaporation or were never filled in the first place which now make noise and/or stink.

One problem with trying to dampen this noise at the orifice is that it's acting like a speaker and insulating the plate will have little effect if it's a high frequency noise it will be hard to tackle in this manner if it's a low frequency noise it will be nearly impossible.

So stopping the noise from entering the pipe is is really your best option.

If there are no such water traps consider a jog or two in the offending pipe that will alter the flow characteristics and all but eliminate flow noise.

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#26

Re: Acoustic Noise Insulation- Piping Orifice Plate

05/10/2016 12:38 AM

just before we all get too far ahead of ourselves

  • the water example, which was educative, was brought up by a responder
  • the op never mentioned that the use was in measurement

at least I think so. we all make comments based on our background which is why OPs need to give as much information as possible. What is obvious to them can cause widely divergent trains of thought in the responders. All the stuff here looks good and is useful in the right circumstances we just dont know what they are. Naturally that goes extra double plus for my comments

If the use is in gas and recycle round a compressor then the pressure drop may exceed 2:1 and so noise is inevitable. At this point all you can do is minimise the impact - larger thicker wall pipe and insulation.

If you have a service with high enough noise to warrant insulation then you MUST investigate acoustic fatigue

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