Discuss API API-571 Exam Topic 1 Question 130

Short-term stress rupture is a/an:

Afailure caused by repeated cycling from elevated temperature, typically characterized by through-wall oxide filled ruptures with little bulging.

Belevated temperature failure caused by localized overheating, typically characterized by bulging and thinning.

Celevated temperature failure caused by diffusion of hydrogen into the material, typically characterized by blistering and cracking.

Dcracking failure caused by sulfides formed at elevated temperature that convert to acids on exposure to moisture and oxygen.

Suggested Answer: B

From API RP 571 Section 5.3.2.1 (Creep and Stress Rupture):

''Short-term creep rupture is often associated with localized overheating and results in bulging and thinning, often with a characteristic 'fish-mouth' rupture appearance. These failures occur under sustained load in a short time (hours or days), typically in high-temperature service due to a sudden increase in temperature or poor heat distribution.''

Thus, Option B accurately describes the mechanism and visual indications of short-term stress rupture.

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11 comments · newest first

Margurite 5 days ago

I lean towards A. The cycling part makes sense.

Junita 10 days ago

I think it's B. Bulging sounds right.

Hector 15 days ago

Not sure about D, seems a bit off to me.

Avery 20 days ago

Wait, hydrogen diffusion causing failure? That sounds wild!

Jade 25 days ago

A is the correct answer, I remember that from class!

Raelene 1 month ago

I think it's more about localized overheating, right?

Tamar 1 month ago

It's definitely related to elevated temperatures.

Sueann 1 month ago

I definitely recall that hydrogen diffusion leads to blistering, but I can't remember if that fits with short-term stress rupture or not.

Roxanne 2 months ago

I’m a bit confused about the differences between the options. I thought cracking from sulfides was more related to long-term exposure rather than short-term stress.

Samira 2 months ago

I remember practicing a question like this where we discussed the characteristics of different types of failures. I feel like bulging is a key indicator for one of the options.

Bette 2 months ago

I think short-term stress rupture is related to elevated temperatures, but I'm not sure if it's more about localized overheating or something else.

API-571 Exam - Topic 1 Question 130 Discussion