英语翻译

英语翻译
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ASME Code Case 2211 provides the option of overpressure protection by system design in lieu of a pressure relief device,if the user ensures that the MAWP of the vessel is greater than the highest pressure which the system can reasonably be expected to attain.Documentation of the required analysis must bear the signature of the individual in responsible charge of the operation of the vessel.
This Code case provides an alternative to the onerous task of assuring that adequate relief provisions have been made for complex,very rapid and uncertain events.For example,this difficulty is not uncommon for runaway reactions and decompositions.The relief condition is typically unknown territory as far as system behavior is concerned.Defining this behavior can become a major effort.By contrast,the failure(s) that initiate the excursion usually occur in the normal range of operation.In principal,then,protection by system design can have a stronger technology base than protection by emergency pressure relief.The difficulty with the system design option is assuring that all "reasonable" scenarios have been properly considered.
The language of this Code case seems to say that the option of protection by system design must be applied to all potential sources of pressure accumulation in a given vessel.That is,if protection against one possible source of pressure is by system design,protection against all other sources must also be by system design even if only minimal relief provisions would be required.
The complete wording of this Code case is presented in Appendix 2C without further comment.The reader is urged to study this case to be aware of the specific provisions.See Karcher et al.(1997) for a review of this Code case with examples.