Discuss API API-936 Exam Topic 5 Question 19

[Curing and Dryout]

In accordance with TR 980, when curing a high-purity, low-cement castable for a high-temperature unit, which of the following sequences ensures minimum cracking risk?

ASteam curing for 48 hours followed by firing at 1500F

BAir curing for 24 hours, followed by controlled heating ramp of 50F/h up to 600F

CAccelerated drying using forced air at 400F for 12 hours

DDryout using open flame burners after form removal

Suggested Answer: B

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21 comments · newest first

Cristy 4 days ago

I think option B is the safest. Controlled heating is key.

Kerrie 9 days ago

B is definitely the best choice for stability during curing.

Thurman 14 days ago

I feel like C might work, but 400F is quite high.

Mica 19 days ago

D is risky! Open flames can cause uneven drying.

Milly 24 days ago

A seems too intense with that high firing right after.

Lawrence 30 days ago

I agree, B minimizes cracking risk effectively.

Mira 1 month ago

I think option B is the safest. Controlled heating is key.

Dong 1 month ago

Controlled heating ramp is the way to go, option B all the way!

Allene 2 months ago

Wait, open flame burners? That sounds risky!

Andra 2 months ago

Not so sure about that, air curing could work too.

Mari 2 months ago

Definitely agree, option A seems solid!

Buddy 2 months ago

I heard steam curing is the best for minimizing cracks.

Carin 2 months ago

I've always used A, never had a problem with it.

Ming 2 months ago

Wait, open flame for drying? That sounds dangerous!

James 3 months ago

C is risky, forced air at that temp can cause issues.

Selma 3 months ago

I disagree, B seems safer with that controlled ramp.

Kallie 3 months ago

A is the best option for minimizing cracking.

Stefany 3 months ago

I definitely remember that open flame burners are usually a bad idea for drying out, so I would avoid option D for sure.

Stevie 3 months ago

I feel like accelerated drying could lead to issues, especially at such a high temperature. I think option C might not be the best choice.

Laine 3 months ago

I practiced a similar question where air curing was preferred, but I can't recall if the heating ramp was supposed to be gradual like in option B.

Micah 5 months ago

I think I remember that steam curing is often recommended for minimizing cracking, but I'm not sure if 48 hours is too long.

API-936 Exam - Topic 5 Question 19 Discussion