1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 136 Pressure CookersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION
2、OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Pressure Cookers, UL 136 Eighth Edition, Dated June 16, 2009 Summary of Topics This revision to ANSI/UL 136 is being issued to reect the reaffirmation of the ANSI approval of the Standard. No technical changes have been made to th
3、e document. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The revisions are substantially in accordance with Proposal(s) on this subject dated January 16, 2015. All rights reserved. No part of this publication m
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8、 requirements 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 fut
9、ure effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. APRIL 14, 2015 UL 136 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 14, 2015 UL 136 tr2 No Text on This PageUL COPYRIGHTED MA
10、TERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 16, 2009 (Title Page Reprinted: April 14, 2015) 1 UL 136 Standard for Pressure Cookers First Edition March, 1948 Second Edition December, 1966 Third Edition May, 1973 Fourth Edition September, 1979 Fifth E
11、dition October, 1990 Sixth Edition November, 1995 Seventh Edition December, 2002 Eighth Edition June 16, 2009 This ANSI/UL Standard for Safety consists of the Eighth Edition including revisions through April 14, 2015. The most recent designation of ANSI/UL 136 as a Reaffirmed American National Stand
12、ard (ANS) occurred on April 14, 2015. 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 Pr
13、oposal 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
14、 Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 136-2010 (R2015)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 16, 2010 PRESSURE COOKERS - UL 136 2 No Text on This Pa
15、geUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 General 4 2.1 Components .4 2.2 Units of measurement .5 2.3 Instructions 5 2.4 Undated references .5 CONSTRUCTION 3 Materials .5 4 Assembly 5 5 Pressure Rel
16、iefs 6 6 Pressure Gauges .6 PERFORMANCE 7 Maximum and Normal Operating Pressure and Leakage Test 6 8 Pressure-Relief Operation Tests 7 8.1 Pressure-relief valves .7 8.2 Secondary or emergency relief devices .8 9 Cover Opening Test .8 10 Locking Mechanism Operation Test .8B 11 Hydrostatic Strength Te
17、st 8B MANUFACTURING AND PRODUCTION TESTS 12 General 10 MARKINGS 13 General 10 INSTRUCTION MANUAL 14 General 11 15 Important Safeguards .12 JUNE 16, 2010 PRESSURE COOKERS - UL 136 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION
18、1 Scope 1.1 These requirements cover household-type cooking utensils known as pressure cookers or pressure sauce pans which operate at a nominal pressure of 15 psig (103 kPa) or less. They are intended for use over gas- or electric-top burners of residential-type cooking ranges. 1.2 These requiremen
19、ts do not cover pressure cookers intended for pressure frying with oil. 1.3 These requirements do not evaluate the toxicity of coatings or the physiological effects of consuming food prepared by use of these appliances. 1.3 added June 16, 2009 1.4 These requirements do not evaluate the operation or
20、use of removable or replaceable parts. 1.4 added June 16, 2009 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component of a product covered by this standard shall comply with the requirements for that component. 2.1.2 A component is not required to comply with a specic requirement t
21、hat: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use.
22、2.1.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. JUNE 16, 200
23、9 PRESSURE COOKERS - UL 136 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.2 Units of measurement 2.2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 2.3 Instruct
24、ions 2.3.1 A copy or draft of the manufacturers instructions covering care and use of the pressure cooker (that shall accompany each product as produced) is to be furnished with the sample submitted for investigation. These instructions are to be used as a guide in the examination and test of the pr
25、oduct. For this purpose, a printed edition is not required. See Instruction Manual, General, Section 15, for details. 2.4 Undated references 2.4.1 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 tha
26、t code or standard. 2.4.1 added June 16, 2010 CONSTRUCTION 3 Materials 3.1 Pressure-holding parts, or parts of relief mechanisms or pressure-relief devices, shall comply with the requirements in this standard and shall have corrosion resistance. 3.1 revised June 16, 2009 3.2 A gasket or seal used as
27、 a pressure-holding part shall be congured so that a substitute part is not capable of being fabricated using ordinary gasket materials available in sheet form. 3.3 Deleted June 16, 2009 4 Assembly 4.1 The product shall be constructed so that an ordinary user is capable of assembling it as intended
28、in a manner to reduce the risk of injury. 4.1 revised June 16, 2010 4.2 Deleted June 16, 2009 4.3 The cover shall be constructed to comply with one of the following: a) When the cover is opened the maximum normal operating pressure shall be released before the fastening means is fully disengaged; b)
29、 The cover shall be removable only after the pressure within the cooker is zero (0) psig; or c) The opening of the cover when the cooker is under pressure shall not result in hazardous displacement of the cover or escape of steam or water. JUNE 16, 2010 PRESSURE COOKERS - UL 136 5UL COPYRIGHTED MATE
30、RIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5 Pressure Reliefs 5.1 A pressure vessel shall be provided with a reliable pressure-relief valve of the spring- or weight-loaded type. It shall be located in the cover of the cooker. 5.1 revised June 16, 2010 5.2
31、 A pressure-vessel cover shall also be provided with a secondary or emergency pressure-relief device (such as a replaceable blowout or fusible plug) or with an arrangement of a clamped and/or gasketed cover to effectively limit pressure in the vessel and prevent distortion of the vessel when the coo
32、ker is tested in accordance with these requirements. 6 Pressure Gauges 6.1 A pressure-indicating device, if provided, shall have a range and dial indicator that is capable of indicating pressures at least 50 percent in excess of the maximum pressure allowed by the operation of the pressure-relief va
33、lve. 6.1 revised June 16, 2009 6.2 The dial is not required to be capable of indicating pressures above the maximum operating range, when the dial is marked CAUTION or the equivalent in the areas of excess pressure. PERFORMANCE 7 Maximum and Normal Operating Pressure and Leakage Test 7.1 The maximum
34、 operating pressure of a cooker shall be the maximum pressure allowed by the operation of the pressure-relief valve under conditions described in 7.5. No leakage of steam or water shall occur at the joint between the body and cover at the maximum operating pressure determined during the test. 7.1 re
35、vised June 16, 2009 7.2 The normal operating pressure of a pressure cooker is the maximum pressure allowed by the operation of the pressure-relief valve under normal heat supply. 7.2 revised June 16, 2009 7.3 Each size and type of pressure vessel is to be tested with at least two samples of the reli
36、ef valve designated for its protection. Exception: When a series of pressure cookers is to be investigated in which the body height is the only difference, two representative samples of the largest size cooker shall be tested. 7.3 revised June 16, 2009 7.4 A calibrated pressure-indicating device is
37、to be mounted to indicate pressures developed within the vessel. The pressure-indicating device shall comply with one of the following: a) An analog gauge having a pressure range of at least 150 percent of the anticipated maximum working pressure; b) A digital pressure transducer, or other digital g
38、auge, that is calibrated over a range of pressure that includes the test pressure; or JUNE 16, 2010 PRESSURE COOKERS - UL 136 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL c) Other device that is equivalent to the devices in (a) or (b). 7
39、.4 revised June 16, 2009 7.5 The relief valve is to be adjusted to its maximum setting. The pressure cooker is to be half lled with water and heated with cover in place and in the closed position on a burner. The burner is to be adjusted to liberate approximately 12,000 Btu per hour for gas burners
40、or 3516 W for electric burners, for cookers that have a nominal inside bottom diameter of 12 inches (305 mm) or less. If the inside diameter exceeds 12 inches, larger inputs are to be delivered proportional to the actual inside area in square inches versus 113 square inches (729 cm 2 ). 7.5 revised
41、June 16, 2009 7.6 The application of heat is to be continued until the relief valve has opened and no further increase in the maximum pressure has occurred over a 5-minute period. The heat is to be reduced until the relief valve operates in accordance with the operating instructions. 7.7 The maximum
42、 or normal operating pressure is to be the highest of those pressures occurring in the test of at least two relief valves. If the maximum pressures in tests of two or more relief valves vary from one sample valve to another by more than 10 percent, the total number of samples tested is to be increas
43、ed to six. The maximum operating pressure is to be the highest observed. In such a case, the lowest operating pressure of any sample is to be at least 85 percent of the maximum operating pressure determined by the above procedure. 8 Pressure-Relief Operation Tests 8.1 Pressure-relief valves 8.1.1 A
44、pressure-relief valve shall not open initially to relieve steam at a pressure less than 80 percent of its maximum operating pressure as determined under conditions described in 7.5. 8.1.1 revised June 16, 2009 8.1.2 Each pressure-relief valve subjected to the test for maximum operating pressure is t
45、o be tested in a similar manner. The initial pressure that occurs at the rst release of steam is to be compared to the maximum operating pressure that occurs with this particular sample. 8.1.3 Observations for this test are to be recorded during the tests for maximum operating pressure as required.
46、JUNE 16, 2009 PRESSURE COOKERS - UL 136 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.2 Secondary or emergency relief devices 8.2.1 Under conditions described in 7.5 and with the primary pressure-relief valve opening plugged, the second
47、ary or emergency relief device or arrangement shall effectively operate to limit pressure in the vessel to not more than 40 percent of the pressure obtained in the Hydrostatic Strength Test, Section 11. 8.2.1 revised June 16, 2009 8.2.2 Each size and type of pressure vessel is to be tested with at l
48、east two samples of the emergency relief device or the device used to relieve excessive pressures. Exception: When a series of pressure cookers is to be investigated in which the body height is the only difference, two representative samples of the largest size cooker shall be tested. 8.2.2 revised
49、June 16, 2009 8.2.3 The sample to be tested is to be equipped with a calibrated pressure-indicating device. The test is to be conducted in the manner described in 7.5. 8.2.3 revised June 16, 2010 8.2.4 The application of heat is to be continued until the relief valve has fully opened. 8.2.4 added June 16, 2010 8.2.5 The secondary or emergency relief pressure is to be the highest of those pressures occurring in the test of at least two of the same secondary or emergency relief devices. If the secondary or emerg
