It is depend on what type of repairing method you use. U can use RT or UT for insert patch and MT or PT for external patch plate. According to API 510, a pressure test shall be applied if the authorized pressure vessel inspector believes that one is
necessary but it also depend on your jurisdictional requirements. There are a lot of consideration should be taken before performing hydrotest such as position of vessel, integrity of support and structure, volume of water, drainage system, blinding point, availability of blind, safety and others
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necessary but it also depend on your jurisdictional requirements. There are a lot of consideration should be taken before performing hydrotest such as position of vessel, integrity of support and structure, volume of water, drainage system, blinding point, availability of blind, safety and others
On Tue, Jul 27, 2010 at 4:21 PM, limesh M <limesh78@gmail.com> wrote:
Dear All,Thank you for the valuable inputs.
I need some more clarifications. What kind of NDT required during and after repair work? Is vessel needs to be hydrotested after repair?Thanks and Regards,Limesh
On Tue, Jul 27, 2010 at 8:06 AM, tong tong <tong2je@gmail.com> wrote:
Dear Limesh,I agreed with Sachin. Usually thickness of cladding is not considered to contribute either partially or fully to design thickness unless this thickness is included during min. thickness(design thickness) calculation for that vessel. Damaged/corroded shell plate may be repaired by removing a section and replacing it with an insert patch (flush patch). Please refer to NBIC-23, API 510 or ASME PCC 2 more details
Regards
On Mon, Jul 26, 2010 at 10:22 PM, sachin sankhe <sachin.sankhe@rediffmail.com> wrote:
Dear Limesh,
I understand that complete CS material is consumed due to corrosion and only cladded ss316 thk is remaining.
Usually thk of clad is not considered to contribute either partailly or fully to design thk requiremnent.
Clad portion thk is only from process point of view
So I would suggest patch work to be done in that area
Regards
Sachin
On Sun, 25 Jul 2010 13:34:44 +0530 wrote
>Dear All,
One of my friend need advise on the following issue,
We have a cladded vessel at our plant containing low pressure
corrosive service. While in operation the external shell of carbon
steel got corroded due to leakage from sight glass; total damaged area
is like 2 feet by 3 feet. Now the situation is that the cladded
material SS 316 is exposed. The thickness of cladded plate is barely
equal to the pressure design thickness. We want to seek advise on the
repair of the same. Should we go for the repair and if yes what should
be the procedure?
Thanks and Regards,
Limesh
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