Line G Refractory

Question 1

For refractory classification what would be considered a normal fusion temperature for the following refractories:

Normal Refractories
Super Refractories
High Temperature Refractories

Answer 1

• Normal Refractories 1600⁰C
• Super Refractories 2200⁰C
• High Temperature Refractories 1900⁰C

Question 2

For refractory compounds and materials, what materials classification group do the following fall under:

Silica
Graphite
Lime

Answer 2

• Silica Acid Materials
• Graphite Neutral Materials
• Lime Alkaline Materials

Question 3

Why do alkaline and acidic refractory material need to be kept apart on installation?

Answer 3

They react with each other under high temperature and form salt

Question 4

What is the main purpose of refractory material?

Answer 4

To contain the heat generated by the combustion process

Question 5

Properly selected, mixed and installed what percentage of fuel costs could refractory save.

Answer 5

5% - 7 %

Question 6

Broadly speaking, what are the two refractory types?

Answer 6

Shaped and Unshaped

Question 7

Refractory helps shape the burner flame in the combustion chamber?
TRUE / FALSE

Answer 7

TRUE

Question 8

What is the most important factor that affects the lifespan of refractory?

Answer 8

Refractory Dry-out

Question 9

What schedule must be followed for curing and dry-out of refractory?

Answer 9

Follow Manufacturer’s Instructions

Question 10

What can cause horizontal crack formation in refractory?

Answer 10

Thermal cycling, Stress accumulation, creep