RE: [MW:15078] HYDRO TEST

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: cswipquestions@gmail.com
To: materials-welding@googlegroups.com

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 <skthatham@gmail.com> wrote:

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

 

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