The intent of this document is to provide a guide that may be used to increase the maximum allowable
working pressure of American Society of Mechanical Engineers certified paper machine dryers. This process, in
which 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 an
increase in machine speed. Any increase in machine speed will also need to be considered as dryer rotational
velocity additive to the internal pressure stress. This guideline does not address determination of additional stress
due to increased machine speed. This guide also provides insight on jurisdictional and insurance provider
acceptance, 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 &
Pressure Vessel Code. A dryer manufactured for use in a jurisdiction or country that does not recognize the ASME
Code or follows an alternate set of design and manufacturing standards is not addressed in this guide. Seek guidance
elsewhere for dryers that were not certified to ASME Code.
| Number of Pages : | 5 |
| Published : | 06/01/2010 |
