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Re: [MW:18193] IQI Wire Selection

By Materials & Welding
Dear Mr. Richard,

If the wall thickness is 4.8mm, then the material thickness will be 4.8+ 1.6 (capping thick. / reinforcement) + 1.0 (root projection) = 7.4 mm. 

As per API STANDARD 1104, 12th Edition, Table 6- Weld Thickness Vs Diameter of ISO Wire Type IQI. If DIN Penetrameter (10 ISO 16) set used for 7.4 mm material thickness, the minimum visible wire is 13 (thick: 0.20 mm or 0.0078 inch). WIRE 13 SHALL BE CONSIDERED DUE TO LOWER MATERIAL THICKNESS.

Penetrameter sensitivity (ISO Penetrameter): 0.20/7.4 X 100 = 2.7%

Further, refer ASME Section V NDE: 2001 Edition, Article 2 Radiographic Examination, Table T-276 IQI Selection and T-233.2 Wire IQI Designation, Wire Diameter and Wire Identity, ASTM Set A Penetrameter minimum visible wire is 5 (thick: 0.20 mm or 0.008 inch). 

Penetrameter sensitivity (ASTM Penetrameter): 0.20/7.4 X 100 = 2.7%

Hope this clarifies........

P Govindan


On Tue, Jul 16, 2013 at 12:31 PM, Richard robes <mech.processes@gmail.com> wrote:
Dear P Govindan,

Thanks for the reply, Wall thickness is 4.8mm, Film side, Single wall single image technique.

Regards
Richard


On Tue, Jul 16, 2013 at 9:13 AM, perumal govindan <perumalgovindan@gmail.com> wrote:
Mr. Richard,

Bit confused your calculation of wire diameter and wire number, please provide your wall thickness of Line Pipe then will calculate the required sensitivity / wire number to be visible on radiography film.

P Govindan


On Mon, Jul 15, 2013 at 5:30 PM, Richard robes <mech.processes@gmail.com> wrote:
Gent's,

Please give me some information regarding RT wire selection criteria. Pipeline job, code API 1104, Material -  Stainless steel.

Calculated Essential Wire number diameter is 0.16 and i got the wire number as 14th from the chart. From these data's how could i get the least visible wire to be seen on the radiograph?

Regards

Richard

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