API-936 무료 덤프문제 온라인 액세스

The lining surface should remain uncovered and free from contact with moisture during the curing period for what type of refractory?

• A.Cement bonded
• B.Ceramic bonded
• C.Hydraulic bonded
• D.Chemically bonded

If application of hydraulic bonded or chemical setting refractory is interrupted, the refractory lining shall be:

• A.immediately cut back to the shell between anchors.
• B.cut back within 1 hour.
• C.cut back within 30 minutes.
• D.cut back to the shell in a straight line.

Throughout a period of at least 24 hours, test specimens for air-setting, phosphate-bonded castable refractories are:

• A.air cured, uncovered.
• B.air cured, covered.
• C.heat cured, uncovered.
• D.heat cured, covered.

For linings that use a surface layer of refractory plastic or a ramming mix, when should trimming, jointing, and venting be done?

• A.After the entire installation is complete
• B.Before stopping work for the day or shift
• C.After water curing for 24 hours
• D.Never; these steps are not required when refractory plastics or ramming mixes are used

When drying out a unit or vessel that has multiple refractories, schedules should be based on:

• A.an average of heating rates and holding times for the refractories and thicknesses being dried out.
• B.extending the hold times by one hour per additional refractory layer.
• C.the refractory or lining system that has the longest duration requirement.
• D.the refractory with the highest density in the dryout.