HYDRO TEST

[Sampath Kumar]

Dear Experts,

 

 

During Hydro Test if air gets locked[Air Lock] [1] what will happen? [2]What is the reason for air lock?[3]What is the precautions one has to take to avoid?pls explain.

 

Thanking you all

 

With Best Regards

 

sampath

 

[Padmanabharaju Konduru]

Dear Sampath,

 

                         if air locks while testing you will not get required pressure constantly, automatically pressure will drops while holding time. Reason behind is this while pumping the water may be relief valve not opened. you should release the pressure relief valve for some time to exit the air while pumping the water.

 

 

I hope this will hepls you.

 

 

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Padmanabha raju K
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[Praphulla]

Hi Sampath
If air get locked inside the vessel during hydrotest, raching to desired hydrotest pressure will take more time.
You need to fill the vesssel from bottom keeping the top vent valve open so that air will come out from vent connection during water fill up.

 

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[sandeep mardikar]

Durring hydrotest uCan Provide vent Nozzle at top side of vessel with pr.guage. this Will help out to remove entire air from vesseL. air LocK may Lead rise of false Pr. at pressure gauge and itMay Cause Of accident.

[Cswip Questions]

Dear Gents,

I am not an expert in hydro test. But I like to share my understandings with you.

[1] If air lock presents

• You cannot get accurate pressure readings
• Unstable pressure
• The entrapped air may cause damage to your equipments, because of expansion of air (you don't know/can't measure the volume of entrapped air)
• It may cause severe failure to your piping system (Air energy is severe than hydro energy)

[2] Reasons for air entrapment

• The general all places filled with air, so the pipe is not empty. you are going to replace air with water.
• So now you know that the principal reason for air entrapment is you are trying to fill water without removing the air (no ventilation).
• Some times poor ventilation, I mean water filling high in volume but vent size is too small or no of vents not sufficient.

[3] Precautions

• Ensure the piping system have necessary vents and drains
• Before starting water filling open all vents
• Fill water slowly avoid turbulence
  
• Overfill and watch water discharge at vents for bubble free water falls.
• If bubbles present overfill until bubble free water discharge achieved.

I believe that the above points will helpful to you

With regards

On Sat, Aug 11, 2012 at 8:56 AM, Sampath Kumar <skth...@gmail.com> wrote:

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[cbe swamym]

Dear All,

The answer as " BOLD "

 

Thank & Best Regards,

 

M Veera SAMY- Bureau Veritas.

Coimbatore

 

 

 

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Date: Sat, 11 Aug 2012 20:57:53 +0530
Subject: Re: [MW:15066] HYDRO TEST
From: cswipqu...@gmail.com
To: material...@googlegroups.com