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stylee_eng
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Join Date: Jul 2011
Posts: 63

Water Hammer

07/20/2011 2:47 AM

dear friends ?

how do you do ? this is my question

what is the water hammer ? how to protect my Golf landscape ... ( the dimensions will be installed if you will ask about it ?) known that i have relief valve for the main pump and check valve to every pipe which suck from tanks ?

dimensions of pipes ( 12" , 10" , 8" , 6" , 4" and 3" )

the longest distance 400 meter ( between pump and last hole which will irrigate )

does the system need accumulator ?
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jlstitt
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Join Date: Apr 2011
Location: pittsburgh
Posts: 180
#1

Re: Water Hammer

07/20/2011 3:57 AM

water hammer is usually due to air trapped in the l water lines. there are different ways to prevent it depending on the design.
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stylee_eng
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Join Date: Jul 2011
Posts: 63
#2
In reply to #1

Re: Water Hammer

07/20/2011 4:52 AM

May you give me some suggestions ? about it specially i had relief valve on discharge line and 2 check valves (before and after gate valves ) of suction line ( cause my tank contains has 3 sub-tanks ) ???
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jlstitt
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Join Date: Apr 2011
Location: pittsburgh
Posts: 180
#3
In reply to #2

Re: Water Hammer

07/20/2011 5:31 AM

i would install a cold water storage tank that has a air bladder inline with the water system. it should absorb the water hammer.
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stylee_eng
Commentator

Join Date: Jul 2011
Posts: 63
#4
In reply to #3

Re: Water Hammer

07/20/2011 7:58 AM

it means you will use hydro-pneumatic system for that ? or only just a tank which has half of water and there is a check valve its direction will be to tank ???
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jlstitt
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Join Date: Apr 2011
Location: pittsburgh
Posts: 180
#6
In reply to #4

Re: Water Hammer

07/21/2011 2:13 AM

yes, i'm referring to a hydo-pneumatic tank. it should be placed near the source of the noise.
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ozzb
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#5

Re: Water Hammer

07/20/2011 1:35 PM

What's the head pressure at the check valves. What you hear could be them slamming closed.

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stylee_eng
Commentator

Join Date: Jul 2011
Posts: 63
#7
In reply to #5

Re: Water Hammer

07/21/2011 5:37 AM

head equal Max. 12 bar
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ozzb
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#8
In reply to #7

Re: Water Hammer

07/21/2011 7:35 AM

what type of check valve did you use?

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stylee_eng
Commentator

Join Date: Jul 2011
Posts: 63
#9
In reply to #8

Re: Water Hammer

07/21/2011 7:55 AM

BIMEX

Double flanged swing check valve

PN 16 ,,, DN 150

Body : GGG50 ,,,, Gate : GGG50

Spindle : stainless steel

coating : Epoxy 250 microns
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ozzb
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Location: Rosedale, Maryland USA
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#10
In reply to #9

Re: Water Hammer

07/21/2011 4:34 PM

The swing gate will slam shut with a lot of back pressure it could well be the noise you are hearing. 12 bar a lot of pressure. Use stethoscope to listen to them to see if they are the cause. If they are there are other types that will eliminate the slamming closed of the valve.

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stylee_eng
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Join Date: Jul 2011
Posts: 63
#11
In reply to #10

Re: Water Hammer

07/23/2011 9:13 AM

thank you
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jlstitt (3); ozzb (3); stylee_eng (5)

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