UL 2335-2010 UL Standard for Safety Fire Tests of Storage Pallets (Second Edition Reprint with Revisions Through and Including August 17 2017)《存储托盘的燃烧试验》.pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 2335 Fire Tests of Storage PalletsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER

2、 REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Fire Tests of Storage Pallets, UL 2335 Second Edition, Dated July 28, 2010 Summary of Topics Revisions are being issued for the following: Clarication of Requirements and Updating of Testing Details Revisions to Comm

3、odity Storage Test Inclusion of New Marking Requirements Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date

4、note indicating the date of publication or the date on which the changed requirement becomes effective. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated August 12, 2011 and July 13, 2012. All rights reserved. No part of this publication may be r

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9、ements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future eff

10、ective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. The following table lists the future effective dates with the corresponding reference. SEPTEMBER 26, 2012 UL 2335 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHO

11、UT PERMISSION FROM UL Future Effective Date Reference March 26, 2014 Paragraphs 7.1, 7.2, 7.3 and 7.4 SEPTEMBER 26, 2012 UL 2335 tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 28, 2010 (Title Page Reprinted: September 26, 2012) 1 UL

12、 2335 Standard for Fire Tests of Storage Pallets First Edition June, 2001 Second Edition July 28, 2010 This ANSI/UL Standard for Safety consists of the Second Edition including revisions through September 26, 2012. The most recent designation of ANSI/UL 2335 as an American National Standard (ANSI) o

13、ccurred on September 26, 2012. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal

14、Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standa

15、rds shall remain the sole and exclusive property of UL. COPYRIGHT 2012 UNDERWRITERS LABORATORIES INC. ANSI/UL 2335-2012UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 26, 2012 FIRE TESTS OF STORAGE PALLETS - UL 2335 2 No Text on Th

16、is PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 General 4 2.1 Units of measurement .4 2.2 Undated references .4 2.3 Requirements 4 PERFORMANCE 3 Idle Pallet Storage Test 5 3.1 Test set-up 5 3.2 Sprin

17、kler system 7 3.3 Test procedure .7 3.4 Calculations 8 4 Commodity Storage Test .10 4.1 Test set-up .10 4.2 Water applicator .11 4.3 Heat release rate 12 4.4 Water application re model .12B 4.5 Test procedure 12B 4.6 Calculations 13 ACCEPTANCE CRITERIA 5 General .14 REPORT 6 General .14 MARKING 7 Ge

18、neral .15 APPENDIX A SEPTEMBER 26, 2012 FIRE TESTS OF STORAGE PALLETS - UL 2335 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 This standard includes test methods and requirements to investigate the re growth perfo

19、rmance of pallets in idle storage, and when storing commodities in palletized and rack storage arrangements, by sprinkler systems installed in accordance with the Standard for the Installation of Sprinkler Systems, NFPA 13. 1.2 Variations from the construction or conditions tested are capable of sub

20、stantially changing the performance characteristics of the pallets. 1.3 This standard does not include test methods and requirements to investigate other performance characteristics such as: a) Fire growth characteristics when pallets are not protected by sprinkler systems, b) Risks associated with

21、materials used in the pallet construction or the products of combustion and c) Physical strength characteristics of the pallets including those during a re condition. 2 General 2.1 Units of measurement 2.1.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory

22、 or approximate information. 2.2 Undated references 2.2.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 2.3 Requirements 2.3.1 Two types of tests are required by this standa

23、rd, idle pallet storage tests and commodity storage tests. The Idle Pallet Storage Test, Section 3, with eithera2x3o ra2x7pallet array, identied herein as Method A or Method B respectively, is used to determine the potential re hazard for the storage of idle pallets. The Commodity Storage Test, Sect

24、ion 4, is used to determine that the commodity classication rank of a warehouse commodity is not increased when the tested pallets are used in place of conventional wood pallets. JULY 28, 2010 FIRE TESTS OF STORAGE PALLETS - UL 2335 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR

25、 DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 3 Idle Pallet Storage Test 3.1 Test set-up 3.1.1 The tests are to be conducted in a room with minimum dimensions of 100 feet by 100 feet (30.5 meters by 30.5 meters). During the test all doors and windows in the room are to be closed. At the start

26、 of the test the room temperature shall not be less than 10C (50F) nor more than 32C (90F). The room shall have a smooth, at, unbounded ceiling located 30 0.17 ft (9.1 0.05 m) above the oor. 3.1.2 Pallet array is to be arranged as follows: a) Method A; Six stacks of pallets 12 0.25 ft (3.6 0.08 m) h

27、igh ina2x3array are to be used for this test. The middle of the2x3array is to be centered between four sprinklers. See Figure 3.1. b) Method B; Fourteen stacks of pallets 12 0.25 ft (3.6 0.08 m) high ina2x7array are to be used for this test. The middle of the2x7array is to be centered between four s

28、prinklers. See Figure 3.2. This is generated text for gtxt. Figure 3.1 Test set-up - Method A JULY 28, 2010 FIRE TESTS OF STORAGE PALLETS - UL 2335 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.1.3 A nominal 4-foot (1.2-meter) length of

29、2x2x0.25 inch (50 x 50 x 6 mm) steel angle beam shall be mounted adjacent to the ceiling directly above the center of the pallet array. Five equally spaced Type K, or equivalent, thermocouples shall be embedded in the steel angle beam to measure its temperature. 3.1.4 Instrumentation shall be presen

30、t to record sprinkler activation, water pressure, water ow rate and steel angle beam temperatures at a minimum scan rate of once every second. Due to the possibility of vision being obscured by the smoke generated during this test, an infrared camera shall be used to visually evaluate the ame propag

31、ation during the test. The infrared camera output shall be recorded. Figure 3.2 Test set-up Method B JULY 28, 2010 FIRE TESTS OF STORAGE PALLETS - UL 2335 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.2 Sprinkler system 3.2.1 A wet-pipe

32、 automatic sprinkler system consisting of a minimum of 36 sprinklers shall be positioned below the ceiling. The sprinkler system shall be connected to a water supply system capable of maintaining the specied water pressure and ow rate for the 36 sprinklers. 3.2.2 Each activated sprinkler shall have

33、a water discharge density of 0.6 0.03 gpm/ft 2 (24.2 1.2 lpm/m 2 ). 3.2.3 The sprinklers used for this test shall be in accordance with the Standard for Automatic Sprinklers for Fire-Protection, UL 199. The sprinklers shall be upright style with a rated temperature of 165F (72C). The sprinklers shal

34、l have a nominal discharge coefficient of 11.2 gpm/(psig 0.5 ). The sprinklers shall have a response time index (RTI) between 234 and 277 ft 0.5 sec 0.5 when determined in accordance with the Standard for Early-Suppression Fast-Response Sprinklers, UL 1767. 3.2.4 The sprinklers shall be installed on

35、 a nominal 10 x 10 ft (3x3m )spacing with their deectors 3.0 1.0 inches (7.6 1.3 cm) below the ceiling. 3.3 Test procedure 3.3.1 Four igniters shall be positioned in the center of the array inside the bottom pallets as shown in Figure 3.2. This is generated text for gtxt. Figure 3.3 Igniter placemen

36、t JULY 28, 2010 FIRE TESTS OF STORAGE PALLETS - UL 2335 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.3.2 Each igniter shall be constructed from a nominal 3-inch (76-mm) diameter by a nominal 6-inch (152-mm) long cellulosic bundle soake

37、d with 8 0.125 uid ounces (236 4 ml) of gasoline and wrapped in a polyethylene bag. 3.3.3 A minimum of 10 seconds of data is to be recorded prior to the ignition of the igniters. 3.3.4 As the sprinklers are activated the sprinkler system shall provide 60 3 gallons/min (227 11 L/min) of water to each

38、 activated sprinkler. 3.3.5 Flame propagation during the test is to be observed and the times at which the ame breaches any side of the array for a duration of 30 continuous seconds are to be recorded as referenced in Table 5.1. 3.3.6 A thermocouple tree shall be positioned at each end of the pallet

39、 array, perpendicular to the longitudinal ue space, as shown in Figure 3.1 and Figure 3.2. The thermocouple tree is to incorporate a minimum of twelve equally spaced, 0.0625 inch (1.5875 mm) diameter, inconel sheathed type K thermocouples along the vertical 12-ft. tall pallet stack arrangement. 3.3.

40、7 The test is to be terminated when one of the following conditions occurs: a) The re is extinguished (see 3.3.8), b) The total time elapsed from the ignition of the igniters reaches 30 minutes, c) More than 6 sprinklers are activated, or d) The average temperature on the 4-foot steel angle beam exc

41、eeds 200F (93C) for more than one minute. 3.3.8 In situations where the igniters fail to create a re large enough to activate at least one sprinkler, the number of igniters shall be doubled and the test procedure repeated until at least one sprinkler is activated. 3.4 Calculations 3.4.1 The average

42、steel angle beam temperature at any time, t, shall be calculated using the following formula: JULY 28, 2010 FIRE TESTS OF STORAGE PALLETS - UL 2335 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL in which: T avg,t is the average temperature

43、 at any time, t, and T 1t ,T 2t ,T 3t ,T 4t , and T 5t are the temperatures measured by the ve thermocouples (see 3.1.3) at any time, t. The number of temperature values in the numerator shall be permitted to be reduced if less than ve thermocouples are functional. See 3.4.3, and T N is the number o

44、f temperature values in the numerator. 3.4.1 revised September 26, 2012 3.4.2 Based upon a 1-second scan interval, the running 60-second average temperature for the test shall be calculated as follows: in which: T 60avg is the 60-second average and n is the scan number (n=1,2,3,.etc.) 3.4.2 revised

45、September 26, 2012 3.4.3 The maximum steel angle beam temperature is the maximum value of T 60avg during the test. If a thermocouple provides erroneous temperature measurements, the average temperature as referenced in 3.4.2 shall be permitted to be calculated using at least three functional thermoc

46、ouples. 3.4.3 revised September 26, 2012 SEPTEMBER 26, 2012 FIRE TESTS OF STORAGE PALLETS - UL 2335 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Commodity Storage Test 4.1 Test set-up 4.1.1 During the tests all doors and windows in the

47、 room shall be closed and the room otherwise controlled as necessary to prevent outside wind and weather conditions from inuencing the test results. Tests are not to be conducted when the room temperature is less than 10C (50F) or more than 32C (90F). 4.1.2 The Commodity Storage Test shall be conduc

48、ted using eight pallets of corrugated cartoned test commodity placed on the subject pallets and arranged ina2b y2b y2storage arrangement. The beams of the storage rack are adjusted so that the top of the lower beam is 10 1.0 inches (25.4 1.27 cm) from the oor, and the distance between the tops of th

49、e upper and lower beams is 60 1.0 inches (152 1.27 cm). The commodity is to be placed on the pallets so that there is a 6 0.25 inch (15.24 0.64 cm) ue space in each direction. See Figure 4.1. Each test commodity shall consist of double tri-wall corrugated cardboard cartons with ve-sided (bottom open) steel stiffeners as referenced for Class II commodity described in the Standard for Automatic Sprinklers for Fire-Protection Service, UL 199. The moistu