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Re: [MW:10326] Existing Tank

By Materials & Welding
Dear Akshat agrawal,
 
You mean to say, Hydrotest can be replaced by Vacuum test .
 
As per cl 12.3.1 of API 653 (ed. 2005).12.5 it has to be hydroetested unless exempted by owner/user or engineering evaluations by engineer (Cl 12.3.2).
 
Can you give the reference for  vacuum box test can be substituted for the Hydrotest.
 
Thanks & Regards,
 
K. Babu
 

----- Original Message -----
Sent: Sunday, March 13, 2011 11:01 PM
Subject: Re: [MW:10312] Existing Tank

what if complete bottom plate welds are vacuum box tested using soap solution?? in that case, what is the purpose of hydrotest??
Regards,

Akshat Agrawal

----- Original Message -----
From: K.Babu
To: materials-welding@googlegroups.com
Cc: srinu p
Sent: Sat, 12 Mar 2011 19:56:27 +0530 (IST)
Subject: Re: [MW:10296] Existing Tank

Hi

 

As per API 653  Cl 12.3 , you need to do Hydrotest,

 

 

Since replacing the bottom plate considered as an major repair you have to do hydrotest

 



 

On Fri, Mar 11, 2011 at 8:29 PM, srinu p <sree.dream6@gmail.com> wrote:


Dear All,

 We have two existing tanks ( 20 years old) 3 mtrs height and 5.7 mtrs dia.. Bottom plate thickness - 8 mm.

 

As per client requirement we have shift the tanks to another place and also they want to change the Bottom plate.

1. As per API standard  or any other standards, if we change the bottom plate, which type tests are required for bottom plate inspection. My opinion is Vaccum Box and DPI or MPI tests are enough? or Any other tests are required?


2.And also if we are using  same bottom plate UT thickness guage checking and VB, DPI/MPI tests are enough? Is it acceptable?

 

Please share your experience.

 

regards,

 

P.Srinu

 

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--
Thanks & regards,

K.Babu




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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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