IMPACT EXEMPTION FOR DUPLEX FLANGES SA 182 Gr F51

[VISHNU]

Dear sir,

I have one query regarding to above subject,

One of the definition of governing thk when using fig. UCS-66 - Governing thickness of flat non welded parts, such as bolted flanges, tubesheet and flat head is the flat component thickness divided by 4

But what about Duplex flanges ? UHA is not giving such clause, so what will be governing thickness to be consider for duplex flanges (SA 182 F51) ?

Thanks in advance

Regards

vishnu 

[Raghuram Bathula]

i guess you should use Appendix JJ, 

UHA -51(g)?

[Vish]

Thanks MW,

But my question remains same that, what will be nominal thickness of duplex flanges to be consider ?
 

vish

[Mehdi Vafakhah]

Dear vish

In UCS-66 the governing thickness is important factor cause we have combination of minimum design metal temperature

 and governing thickness to the subject material. 

but in UHA-51 impact test requirement is based on the material properties and material thickness is not an essential variable . (except where noted)

UHA-51 IMPACT TESTS

Impact tests, as prescribed in (a),shall be performed

on materials listed in Table UHA-23 for all combinations

of materials and minimum design metal temperatures

(MDMTs) except as exempted in (d), (e), (f), (g), (h),or

(i). 

Best regards.

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