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TAPPI TIP 0402-16 Guidelines for inspection and nondestructive testing of cast iron paper machine dryers
standard by Technical Association of the Pulp and Paper Industry, 07/13/2015
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This Technical Information Paper (TIP) provides guidelines for inspecting cylindrical, steam-heated pressurevessels made from gray cast iron (GCI) and used as rotating dryers in papermaking. These guidelines also apply tounheated GCI cylinders of the same construction. Large Yankee dryers typically used on tissue machines are notaddressed in this TIP.These guidelines are limited to inspection of the dryer pressure vessels themselves. Inspection of relatedsteam and condensate piping, relief valves, bearings and gears, and doctoring devices is not directly covered.Nevertheless, the inspector should report unusual symptoms and conditions in those components and include thatinformation in the inspection findings as soon as they are detected, in order to prioritize the suspect dryers fordetailed inspection at the earliest opportunity in the "out of operation" mode (i.e., during a dryer shutdown).