1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 2335 Fire Tests of Storage Pallets STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AU
2、THORIZED FOR FURTHER 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 This revision of ANSI/UL 2335 is being issued to update the title page to reect reaffirmation of ANSI a
3、pproval. 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 note indicating the date of publication or the d
4、ate on which the changed requirement becomes effective. The revisions are substantially in accordance with Proposal(s) on this subject dated June 30, 2017. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, elect
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8、ty, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The following table lists the future effective dates with the corresponding reference. AUGUST 17,
9、 2017 UL 2335 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Future Effective Date Reference March 26, 2014 Paragraphs 7.1, 7.2, 7.3 and 7.4 AUGUST 17, 2017 UL 2335 tr2UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DI
10、STRIBUTION WITHOUT PERMISSION FROM UL JULY 28, 2010 (Title Page Reprinted: August 17, 2017) 1 UL 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 August 17
11、, 2017. The most recent designation of ANSI/UL 2335 as a Reaffirmed American National Standard (ANS) occurred on August 17, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. Comments or proposals for revisions on any part of the Standard may be su
12、bmitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at https:/. 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 St
13、andards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 2335-2012 (R2017)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION F
14、ROM UL SEPTEMBER 26, 2012 FIRE TESTS OF STORAGE PALLETS - UL 2335 2 No Text on This 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 Re
15、quirements 4 PERFORMANCE 3 Idle Pallet Storage Test 5 3.1 Test set-up 5 3.2 Sprinkler 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 Ca
16、lculations 13 ACCEPTANCE CRITERIA 5 General .14 REPORT 6 General .14 MARKING 7 General .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 s
17、tandard includes test methods and requirements to investigate the re growth performance 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
18、 13. 1.2 Variations from the construction or conditions tested are capable of substantially 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 characteristi
19、cs when pallets are not protected by sprinkler systems, b) Risks associated with 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 stat
20、ed without parentheses are the requirement. Values in parentheses are explanatory 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 o
21、r standard. 2.3 Requirements 2.3.1 Two types of tests are required by this standard, 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 pote
22、ntial re hazard for the storage of idle pallets. The Commodity Storage Test, Section 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 PALL
23、ETS - UL 2335 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR 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).
24、 During the test all doors and windows in the room are to be closed. At the start 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
25、arranged as follows: a) Method A; Six stacks of pallets 12 0.25 ft (3.6 0.08 m) high 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
26、be used for this test. The middle of the2x7array is to be centered between four sprinklers. 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 DIS
27、TRIBUTION WITHOUT PERMISSION FROM UL 3.1.3 A nominal 4-foot (1.2-meter) length of2x2x0.25 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 s
28、teel angle beam to measure its temperature. 3.1.4 Instrumentation shall be present 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 durin
29、g this test, an infrared camera shall be used to visually evaluate the ame propagation 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
30、 OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.2 Sprinkler system 3.2.1 A wet-pipe 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 press
31、ure and ow rate for the 36 sprinklers. 3.2.2 Each activated sprinkler shall have 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 s
32、hall be upright style with a rated temperature of 165F (72C). The sprinklers shall 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-Suppress
33、ion Fast-Response Sprinklers, UL 1767. 3.2.4 The sprinklers shall be installed on 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
34、shown in Figure 3.2. This is generated text for gtxt. Figure 3.3 Igniter placement 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
35、3-inch (76-mm) diameter by a nominal 6-inch (152-mm) long cellulosic bundle soaked 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 th
36、e sprinkler system shall provide 60 3 gallons/min (227 11 L/min) of water to each 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 T
37、able 5.1. 3.3.6 A thermocouple tree shall be positioned at each end of the pallet 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 t
38、ype K thermocouples along the vertical 12-ft. tall pallet stack arrangement. 3.3.7 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 sprinkler
39、s are activated, or d) The average temperature on the 4-foot steel angle beam exceeds 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 repeat
40、ed until at least one sprinkler is activated. 3.4 Calculations 3.4.1 The average 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 DIS
41、TRIBUTION WITHOUT PERMISSION FROM UL in which: T avg,t is the average temperature 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
42、 if less than ve thermocouples are functional. See 3.4.3, and T N is the number of 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
43、 is the 60-second average and n is the scan number (n=1,2,3,.etc.) 3.4.2 revised 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
44、3.4.2 shall be permitted to be calculated using at least three functional thermocouples. 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
45、 Storage Test 4.1 Test set-up 4.1.1 During the tests all doors and windows in the 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 1
46、0C (50F) or more than 32C (90F). 4.1.2 The Commodity Storage Test shall be conducted 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 1
47、0 1.0 inches (25.4 1.27 cm) from the oor, and the distance between the tops of the 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 c
48、onsist 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 moisture content of the cardboard boxes as measured in representative s
49、amples shall be 8 3 percent. For pallets that contain some wood components, the moisture content of the wood components, as measured in representative samples, shall not exceed 12 percent. 4.1.2 revised September 26, 2012 This is generated text for gtxt. Figure 4.1 Commodity storage test set-up SEPTEMBER 26, 2012 FIRE TESTS OF STORAGE PALLETS - UL 2335 10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4.1.3 As sh
