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API-936 Exam - Topic 5 Question 19 Discussion

[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?
B) Air curing for 24 hours, followed by controlled heating ramp of 50F/h up to 600F
A) Steam curing for 48 hours followed by firing at 1500F
C) Accelerated drying using forced air at 400F for 12 hours
D) Dryout using open flame burners after form removal

API-936 Exam - Topic 5 Question 19 Discussion

Actual exam question for API's API-936 exam
Question #: 19
Topic #: 5
[All API-936 Questions]

[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?

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Suggested Answer: B

by Maryanne at May 11, 2026, 01:59 PM

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Stefany
1 day ago
I definitely remember that open flame burners are usually a bad idea for drying out, so I would avoid option D for sure.
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Stevie
6 days 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.
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Laine
12 days 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.
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Micah
2 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.
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