NDT for Formed heads

qaqcmpm · **Joined:** Wed Sep 24, 2008 11:45 am **Posts:** 64

Does Formed heads require NDT? in the knuckle or in outer/inner circumeference?

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 657

qaqcmpm wrote:

Does Formed heads require NDT? in the knuckle or in outer/inner circumeference?

Welds in formed heads are Cat. A. The NDE requirements are the same as other Cat. A weld in the pressure vessel. MG

qaqcmpm · **Joined:** Wed Sep 24, 2008 11:45 am **Posts:** 64

If it is not a welded construction, the surfaces require any NDT?

sanjeev_shukla70 · **Joined:** Wed Apr 18, 2007 2:05 pm **Posts:** 260

Test/s to detect any surface cracks and thickness gauging for the minimum thickness achieved after forming.

Regards

qaqcmpm · **Joined:** Wed Sep 24, 2008 11:45 am **Posts:** 64

Is it code requirment? what is the sec 8 reference?

sanjeev_shukla70 · **Joined:** Wed Apr 18, 2007 2:05 pm **Posts:** 260

Code:

UG-95 EXAMINATION OF SURFACES DURING FABRICATION: As fabrication progresses, all materials used in the construction shall be examined for imperfections that have been uncovered during fabrication as well as to determine that the work has been done properly.

Code:

UG-32 FORMED HEADS, AND SECTIONS, PRESSURE ON CONCAVE SIDE
(a)The minimum required thickness at the thinnest point after forming(18) of ellipsoidal, torispherical, hemi-spherical, conical, and toriconical heads under pressure on the concave side(plusheads) shall be computed by the appropriate formulas in this paragraph.
(18) In order to ensure that a finished head is not less than the minimum thickness required, it is customary to use a thicker plate to take care of possible thinning during the process of forming

NDT for Formed heads

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