Inspection of open-hole welds?
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Inspection of open-hole welds? We perform 20% radiography on the equipment, but we have created a access hole in one weld, and the customer requires 100% radiography for that weld. Is there any specification or standard that mandates 100% radiography for welds with access holes? What is this rule? (This weld is 3 meters long, with an opening diameter of 80 mm)
GB150-1998 10.8.2.2 (C): The welded joints enclosed within a circle with the center of the opening as its center and 1.5 times the diameter of the opening as its radius. The aforementioned regulations certainly include openings in the welds, so they should all be inspected. Personal opinion!
Even if calculated at 1.5 times, it’s not necessary to take X-rays of the entire weld, right? 1.5*80*2=240, and 3000*20%=600.
For 20 welds, there are no regulations or standards requiring 100% radiographic inspection of welds with openings; such a requirement exists only if the user specifies it in the design drawings and indicates that those welds need to be inspected 100% through radiography. Otherwise, radiographic inspection of areas with openings is carried out in accordance with the established rules and the provisions outlined in GB150. Therefore, the user’s request for 100% radiographic inspection of this weld is unfounded.
Requirements are specified in both GB150 and ASME Section 8.1
Reply to 5# jinboldin brother, could you be more specific? Which part, which provision?
I think 100% radiographic testing is still the way to go. Since the user has requested it, then we should carry out the testing. If someone is willing to pay for it, then go ahead and do it. Standards are one thing, but the user’s request is another! ! The specifications require that holes be made as far away from the welds as possible; since you’re here, it’s better to take a photo anyway! ! Personal opinion!
It can be done in accordance with the requirements stipulated in the contract, subject to compliance with **regulations and standards. Since the user has requested it, let’s do it.
In 150, it only specifies that 100% radiographic inspection of the welds within a range of 1.5 times the diameter of the opening is required; what the original poster suggested might not be necessary. But since the customer has requested it, then we should carry out the inspection after all – after all, the customer is king!
Why bother talking to them? It’s interesting; just carry out the inspections if that’s what needs to be done. Comprehensive inspections ensure better welding quality of the equipment. Standards are merely the minimum requirements, and one must not stick strictly to them. The original poster has some misconceptions – always remember that standards are only the baseline! Don’t stick to the standard! Hehe, Chinese manufacturing is so rough; meeting standards is very risky. Hehe, it’s better to leave some margin
This post was last edited and replied to by Lu Aikui on 2011-7-26 00:29. Reply to 2# dingo1986: It’s only within a radius of 120 mm; that is, a circle with a diameter of 80, with a radius of 120 drawn around its center. The area inside this circle meets the requirements of GB150. Of course, the customer’s requirements come first~