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For linings that use a surface layer of refractory plastic or a ramming mix, when should trimming, jointing, and venting be done?
Correct Answer: B
When using refractory plastics or ramming mixes, it is critical thattrimming, jointing, and venting be performed before stopping work for the day or shift. API 936 and TR 980 specify that proper surface preparation helps relieve vapor pressure during dryout and prevents cracking. If these steps are postponed, the surface may dry unevenly or set improperly, complicating the subsequent installation and reducing bond quality between layers. Venting paths are particularly important in thick plastic or ramming layers where moisture may be trapped, and jointing ensures layer-to-layer continuity. Trimming also smooths out inconsistencies and aligns the lining to specifications. Reference: API TR 980 - Section "Refractory Plastics and Ramming Mixes: Trimming, Jointing, and Venting" requires these actions be doneprior to any interruptionof installation work.