Discuss API API-936 Exam Topic 3 Question 2

[Material Requirements]

Which of the following conditions must be met for test results from trial mixes of low cement castables to be accepted for qualification?

AThe water content must not vary more than 1.0% from that recommended by the manufacturer.

BSpecimens must be fired at 1500F (815C) and held for a minimum of 3 hours.

CBulk density and CCS must exceed average values published in ASTM C401.

DThe drying process must be conducted at 220F (104C) for at least 48 hours before firing.

Suggested Answer: A

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13 comments · newest first

Lelia 10 months ago

C is spot on, ASTM C401 is the standard we follow.

Jess 10 months ago

I think B is too high. Most tests are done at lower temps.

Helaine 10 months ago

220F for 48 hours? That seems excessive, not sure about that.

Aileen 10 months ago

D sounds right, but I’ve seen variations in practice.

Tayna 10 months ago

A is definitely a must! Can't mess with water content.

Carisa 11 months ago

The drying process at 220F sounds familiar, but I’m uncertain if it has to be for a full 48 hours or if there’s some flexibility.

Shawna 11 months ago

I feel like bulk density and CCS are critical, but I can't remember the exact ASTM standard we discussed. Was it C401?

Lourdes 11 months ago

I remember something about firing temperatures, but I can't recall if it was specifically 1500F or if there were other options.

Veronique 11 months ago

I think the water content limit is really important, but I’m not sure if it’s exactly 1.0% or if it could be a bit more.

Arleen 12 months ago

This is a tricky one. There are a lot of specific details to keep track of, like the exact temperature and duration for firing. I'm not 100% confident I have all the right information memorized, but I'll do my best to reason through the options and select the most plausible answer.

Youlanda 12 months ago

Okay, let me think this through step-by-step. The question is asking about the conditions that must be met for the test results to be accepted. Based on the options, it looks like the water content, firing temperature and duration, and density/strength requirements are all important factors. I'll make sure to double-check each of those in my answer.

Mindy 12 months ago

Hmm, I'm a little unsure about this one. The question is asking about specific requirements, but I'm not totally clear on what qualifies as "low cement castables" or the details of the testing process. I'll need to review my notes to make sure I understand the context.

Jamey 1 year ago

This seems like a pretty straightforward question about the requirements for qualifying low cement castables. I think I've got a good handle on the key conditions that need to be met.

API-936 Exam - Topic 3 Question 2 Discussion