UL 448 2007 消防服务用离心固定泵Centrifugal Stationary Pumps for Fire-Protection Service.pdf

UL448 Centrifugal Stationary Pumps for Fire-Protection Service UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL june8,2007-ul448 Underwriters Laboratories Inc .( UL) 333 Pfingsten Road Northbrook .60062-2096 UL Standard for Safety for Centrifugal Stationary Pumps for Fire-Protection Service ,UL 448 Tenth Edition ,Dated June 8 .2007 SUMMARY OF TOPICS This New Edition of ANSI /UL448 includes the following changes : Change scope section to reference centrifugal pumps for fire protection service Clarification of which devices are required to be supplied with each pump . Revise 7.2 to indicate that provisions for feet or a fabricated support ( base)are to be provided by the pump manufacturer . Clarification of criteria related to the construction of the discharge head for a vertical turbine pump . Clarification of which metals are accepted as being corrosion resistant without further testing . Clarification that the term maximum working pressure denotes the maximum pressure developed at the discharge flange...