Re: [MW:4492] Duplex Stainless Steel Pump casing

Dear Murthy.

I Recomended 2 procedure:

1.- Use Fluorecent PT. cover all pump and created dark space.

or

2.- My experience practice, put gasoil,  on outside pump and check with

black light lamp or normal lamp inside pump.

 

and say me if you can will do it.

 

best regards

Agustin Jimenez 

---

De: rajagopal kannan <rajagopal.kannan@gmail.com>
Para: materials-welding@googlegroups.com
Enviado: dom, marzo 7, 2010 11:35:15 PM
Asunto: Re: [MW:4482] Duplex Stainless Steel Pump casing

Dear Murthy,

try a post emulsification PT, if accessible, so that you can locate the pinholes on both sides precisely. but there are least chances for any NDT to detect a leak path.

Thanks,

K.Rajagopal

On Sun, Mar 7, 2010 at 1:16 PM, Hari Srinivasa Murthy <harimurthy@gmail.com> wrote:

Dear Friends,

 

Recently in one of our water injection plants, we experience  leak from a pump casing.The leak was due to a suspected minor pinhole. Pump casing is of Duplex Stainless Steel (ASTM A 891). Casing thickness is about 100 mm. Pump working pressure is 5000 PSI.

We have opened the pump  performed DP on the casing internally and externally to identify the path of the leak and causes of leak. We have identified 4 suspected spots from inside the casing, which could lead to  the leak. We have taken Radiography (using Ir192- 14.2 ci) of the casting  with high exposure times but could not get any clear result. We have also used available low frequency VSY UT probe to detect the cause of the leak. This probe could provide us details of casting defect  up to 15-16 mm only. We could not decide the leak path withis information.

With the above background, I would like to request our forum specialists to suggest me  NDT methods to identify the leak path throughout the casting thickness and to share related experiences if any in your facilities.

 

 

Regards

Srinivasa Murthy Hari

 

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.

---

¡Obtén la mejor experiencia en la web!
Descarga gratis el nuevo Internet Explorer 8
http://downloads.yahoo.com/ieak8/?l=e1