UL-SUBJECT-693-1991.pdf
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1、 STD-UL SUBJECT b73-ENGL 1771 E 7275775 b72457 OU7 June, 1991 1 SUBJECT 693 OUTLINE OF INVESTIGATION FOR EXCESS PRESSURE PUMPS FOR WET PIPE SPRINKLER SYSTEMS Issue Number 2 JUNE, 1991 COPYRIGHT 1989, I991 UNDERWRITERS LABORATORIES INC. Copyright Underwriters Laboratories Inc. Provided by IHS under l
2、icense with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/21/2006 23:36:28 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-UL SUBJECT b73-ENGL 1771 7275775 Ob72458 T 4 5 2 EXCESS PRESSURE PUMPS FOR WET PIPE SPRINKLER SYSTEMS - SUBJECT 693 JUNE
3、, 1991 No Text on This Page Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/21/2006 23:36:28 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-UL SUBJECT b93-ENGL 1771 727
4、5775 0b72457 78L 3 JUNE, 1991 EXCESS PRESSURE PUMPS FOR WET PIPE SPRINKLER SYSTEMS - SUBJECT 693 CONTENTS FOREWORD GENERAL 1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 PERFORMANCE 2 General . . . . . . . . . . . . . .
5、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Installation Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Operational Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6、. . . . . . . . . . . . . . . . . . . . 6 5 Endurance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 Hydrostatic Pressure Strength Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 MARKING 7 General .
7、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/21/2006 23:36:28 MDTNo reproduction
8、 or networking permitted without license from IHS -,-,- 4 EXCESS PRESSURE PUMPS FOR WET PIPE SPRINKLER SYSTEMS - SUBJECT 693 JUNE, I991 FOREWORD A. This Outline of Investigation contains basic requirements for products covered by Underwriters Laboratories Inc. (UL) under its Follow-Up Service for th
9、is category within the limitations given below and in the Scope section of this Outline of Investigation. They are subject to revision as further experience and investigation may show is necessary or desirable. B. The observance of these requirements by a manufacturer is one of the conditions of the
10、 continued coverage of the manufacturers product. C. A product which complies with the text of this Outline of Investigation will not necessarily be judged to comply with the Outline of Investigation if, when examined and tested, it is found to have other features which impair the level of safety co
11、ntemplated by these requirements. D. A product employing materials or having forms of construction differing from those detailed in the requirements of this Outline of Investigation may be examined and tested according to the intent of the requirements and, if found to be substantially equivalent, m
12、ay be judged to comply with the Outline of investigation. E. UL, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufacturer or any other party. The opinions and findings of UL represent its professional judgment giv
13、en with due consideration to the necessary limitations of practical operation and state of the art at the time the Outline of Investigation is processed. UL shall not be responsible to anyone for the use of or reliance upon this Outline of Investigation by anyone. UL shall not incur any obligation o
14、r liability for damages, including consequential damages, arising out of or in connection with the use, interpretation of, or reliance upon this Outline of Investigation. F. Many tests required by the Outline of Investigations of UL are inherently hazardous and adequate safeguards for personnel and
15、property shall be employed in conducting such tests. Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/21/2006 23:36:28 MDTNo reproduction or networking permitted without license from IHS -,-,- STD*UL
16、SUBJECT b93-ENGL 1971 9275775 Ob929bL 53T JUNE, 1991 EXCESS PRESSURE PUMPS FOR WET PIPE SPRINKLER SYSTEMS - SUBJECT 693 5 GENERAL 1 General I. 1 Excess pressure pumps are intended for installation on wet pipe sprinkler systems as a means of establishing excess pressure for suppression of false alarm
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