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The intent of this document is to provide a guide that may be used to increase the maximum allowableworking pressure of American Society of Mechanical Engineers certified paper machine dryers. This process, inwhich no physical change is made to the dryer, is defined as an "alteration" by the National Board Inspection Code.Machine capacity may be increased by increasing the dryer steam pressure. This benefit may be accompanied by anincrease in machine speed. Any increase in machine speed will also need to be considered as dryer rotationalvelocity additive to the internal pressure stress. This guideline does not address determination of additional stressdue to increased machine speed. This guide also provides insight on jurisdictional and insurance provideracceptance, which may be required before any pressure increase is implemented.

This guide does not address a paper machine dryer that was not originally certified to the ASME Boiler

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Published: 06/01/2010 Number of Pages: 5