TEST COUPON IN PIPE AND MIN LENGTH

مدیران اماکن عمومی و صاحبان و متصرفان اماکن خصوصی موظف‌اند توقف اتباع خارجی را ظرف مدت 24 ساعت پس از ورود آنان، به مرجع انتظامی اطلاع دهند.

معاونت اجتماعی و پیشگیری از وقوع جرم دادگستری استان تهران

QW-302 TYPE OF TEST REQUIRED

QW-302.1 Mechanical Tests. Except as may be specified for special processes (QW-380), the type and number of test specimens required for mechanical testing shall be in accordance with QW-452. Groove weld test specimens shall be removed in a manner similar to that shown in Figures QW-463.2(a) through QW-463.2(g). Fillet weld test specimens shall be removed in a manner similar to that shown in Figures QW-462.4(a) through QW-462.4(d) and Figure QW-463.2(h).

All mechanical tests shall meet the requirements pre- scribed in QW-160 or QW-180, as applicable.

QW-302.2 Volumetric NDE.

When the welder or welding operator is qualified by volumetric NDE, as permitted in QW-304 for welders and QW-305 for welding operators, the minimum length of coupon(s) to be exam- ined shall be 6 in. (150 mm) and shall include the entire weld circumference for pipe(s), except that for small diameter pipe, multiple coupons of the same diameter pipe may be required, but the number need not exceed four consecutively made test coupons. The examination technique and acceptance criteria shall be in accordance with QW-191

QW-302.3 Test Coupons in Pipe.

For test coupons made on pipe in position 1G or 2G of Figure QW-461.4, two specimens shall be removed as shown for bend specimens in Figure QW-463.2(d) or Figure QW-463.2(e), omitting the specimens in the upper‐right and lower‐left quadrants, and replacing the root‐bend specimen in the upper‐left quadrant of Figure QW-463.2(d) with a face‐ bend specimen. For test coupons made on pipe in position 5G or6G of Figure QW-461.4, specimens shall be removed in accordance with Figure QW-463.2(d) or Figure QW-463.2(e) and all four specimens shall pass the test. For test coupons made in both positions 2G and 5G on a single pipe test coupon, specimens shall be removed in accordance with Figure QW-463.2(f) or Figure QW-463.2(g).

QW-302.4 Visual Examination.

For plate coupons all surfaces (except areas designated “discard”) shall be examined visually per QW-194 before cutting of bend specimens. Pipe coupons shall be visually examined per QW-194 over the entire circumference, inside and outside.

QW-304.1 Examination.

Welds made in test coupons for performance qualification may be examined by visual and mechanical examinations (QW-302.1, QW-302.4) or by volumetric NDE (QW-302.2) for the process(es) and mode of arc transfer specified in QW-304. Alternatively, a minimum 6 in. (150 mm) length of the first production weld(s) made by a welder using the process(es) and/or mode of arc transfer specified in QW-304 may be exam- ined by volumetric NDE.

(a) For pipe(s) welded in the 5G, 6G, or special posi- tions, the entire production weld circumference made by the welder shall be examined.

(b) For small diameter pipe where the required minimum length of weld cannot be obtained from a single pro- duction pipe circumference, additional consecutive circumferences of the same pipe diameter made by the welder shall be examined, except that the total number of circumferences need not exceed four.

(c) The examination technique and acceptance criteria for production welds shall be in accordance with QW-191.