1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJANUARY 31, 20081SUBJECT 2576OUTLINE OF INVESTIGATIONFORREFRACTORY COMBUSTION CHAMBER LINERSIssue No. 1January 31, 2008Summary of TopicsThis First Issue of the Outline of Investigation for Refrac
2、tory CombustionChamber Liners, SU 2576, covers factory built refractory liners intendedfor use in fuel-burning heating equipment, such as gas and/or oil-firedboilers, furnaces, and water heaters, to line the combustion chamber orserve as insulating material.The UL Foreword is no longer located withi
3、n the UL Standard. For informationconcerning the use and application of the requirements contained in thisStandard, the current version of the UL Foreword is located onULStandardsInfoNet at: http:/ 2008 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORD
4、ISTRIBUTION WITHOUT PERMISSION FROM ULJANUARY 31, 2008SUBJECT 25762No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Components .43 Units of Measurement .44 Undated References 55 Glossary .5CON
5、STRUCTION6 General 5PERFORMANCE7 General 68 Identification Test .69 Ignition Test 610 Exposure to Humid Atmosphere Test .711 Operation Test 712 Oil Saturation Test .713 Water Saturation Test 814 Flame Impingement Test .8MANUFACTURING AND PRODUCTION TESTS15 General .9MARKING16 General .9INSTRUCTIONS1
6、7 General 10JANUARY 31, 2008 SUBJECT 2576 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements apply to factory built refractory liners intended for use in fuel-burning heatingequipment, such as gas and/or
7、 oil-fired boilers, furnaces, and water heaters, to line the combustionchamber or serve as insulating material.1.2 The combustion chamber liners are intended as a component of the fuel-burning end productequipment and are subject to the requirements of the applicable end product safety standard.2 Co
8、mponents2.1 Except as indicated in 2.2, a component of a product covered by this Outline of Investigation shallcomply with the requirements for that component.2.2 A component is not required to comply with a specific requirement that:a) Involves a feature or characteristic not required in the applic
9、ation of the component in theproduct covered by this outline, orb) Is superseded by a requirement in this outline.2.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.2.4 Specific components are incomplete in construction features or restricted in
10、 performance capabilities.Such components are intended for use only under limited conditions, such as certain temperatures notexceeding specified limits, and shall be used only under those specific conditions.3 Units of Measurement3.1 Values stated without parentheses are the requirement. Values in
11、parentheses are explanatory orapproximate information.JANUARY 31, 2008SUBJECT 25764UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4 Undated References4.1 Any undated reference to a code or standard appearing in the requirements of this outlin
12、e shall beinterpreted as referring to the latest edition of that code or standard.5 Glossary5.1 For the purpose of this Outline the following definitions apply.5.2 COMBUSTION CHAMBER The portion of a fuel-burning heating appliance within whichcombustion of the specified fuel occurs.5.3 COMPRESSION J
13、OINT A method of joining two items utilizing compressive force with binding toprevent separation.5.4 FUEL OIL Any hydrocarbon oil as defined by the Specification for Fuel Oils, ANSI/ASTM D396.5.5 GAS Any hydrocarbon gases as defined by the National Fuel Gas Code, NFPA 545.6 LAP JOINT An overlap meth
14、od of joining two items resulting in double thickness of the material.5.7 REFRACTORY Material that once formed and subject to a curing process, is difficult to melt orreform and resistant to heat.CONSTRUCTION6 General6.1 Means shall be provided to secure the liner material as its intended within the
15、 combustion chamber.Such means shall be suitable for the temperatures involved and be readily field replaceable. The linershall maintain sufficient inherent rigidity to maintain shape and its intended position within the combustionchamber, during the applications of the tests specified by this Outli
16、ne of Investigation.6.2 If compression joints are utilized in the construction of the combustion chamber liner, the liner materialshall be under sufficient compression to maintain shape and its intended position within the combustionchamber, during the applications of the tests specified by this Out
17、line of Investigation.6.3 If lap joints are utilized, a minimum overlap of 3/8 inch (1 cm) at all joints is required.6.4 The overall dimensions of the combustion chamber liner shall permit replacement in the field. In theapplication of replacement or installation, it shall not be necessary to bend t
18、he liner in a manner that wouldbe damaging to the material.6.5 The use of insulating fill material between surfaces of the combustion chamber liner material andsurface of the combustion chamber are not permitted.JANUARY 31, 2008 SUBJECT 2576 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPROD
19、UCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL6.6 At the conclusion of each Test specified in this Outline of Investigation, an examination of thecombustion chamber liner material shall be conducted to determine there is no evidence of deteriorationor any condition that would hinder the performanc
20、e of the liner.PERFORMANCE7 General7.1 Combustion burners utilized on the test appliance shall be rated at the maximum fuel input for whichthe combustion chamber liner is to be rated.7.2 During the tests specified herein, the refractory combustion chamber liner shall maintain its rigidity asit is in
21、tended during normal use.8 Identification Test8.1 The density of the material of the refractory combustion chamber liner shall be determined anddocumented. The tests shall be conducted at an ambient temperature of 77 5F (25 2C). and atatmospheric pressure.8.2 Representative samples of the material s
22、hall be measured and weighed. The density of the materialshall be calculated as the weight per unit volume.8.3 Representative samples are considered equivalent when the alumina and silica concentration iswithin five percent.9 Ignition Test9.1 Three representative samples of the refractory combustion
23、 chamber liner material are to beconditioned to a constant weight at 221 5F (105 2C).9.2 The conditioned samples, as specified in 9.1, are to be heated for 48 hours at maximum ratedtemperature of the refractory combustion chamber liner in a high temperature furnace. After the 48 hourheating period,
24、the samples are to be cooled in a desiccator and then weighed.9.3 The percent gain/loss in weight shall not be more than ten percent of the original (as received) samplematerial.9.4 Observation of each specimen should not show any disintegration or noticeable loss of structuralstrength.JANUARY 31, 2
25、008SUBJECT 25766UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL10 Exposure to Humid Atmosphere Test10.1 Three representative samples of the refractory combustion chamber liner material are to beconditioned to a constant weight at 221 5F (105
26、2C).10.2 The conditioned samples, as specified in 10.1, are to be exposed to air, saturated with distilled watervapors, at 104 5F (40 2C) in a glass test chamber for a period of 10 days. After the 10 day exposureperiod, the samples of the refractory combustion chamber liner material are to be condit
27、ioned to aconstant weight at 221 5F (105 2C).10.3 After drying, the samples are to be cooled in a desiccator and then weighed.10.4 The percent gain/loss in weight shall not be more than ten percent of the original (as received)sample material.10.5 Observation of each specimen should not show any dis
28、integration or noticeable loss of structuralstrength.11 Operation Test11.1 A representative sample of the refractory combustion chamber liner shall be installed within a typicalappliance per manufacturers instructions.11.2 The burner of the appliances shall be operated intermittently, 10 minutes “on
29、” and 10 minutes “off”.The duration of the test is to be that required to obtain conclusive performance data, and is expected tobe until the burner has been fired for 250 hours.11.3 During the test period, daily observations and recordings are to be made of the condition of therefractory combustion
30、chamber liner.11.4 Observation of each specimen should not show any disintegration or noticeable loss of structuralstrength.12 Oil Saturation Test12.1 A representative sample of the refractory combustion chamber liner material shall be installed in anopen drum. The open drum shall be sized according
31、ly to the oil burner selected, in accordance with 7.1,and properly vented to the outdoors.12.2 The material shall be saturated with the burner fuel oil utilizing the oil burner operation with theignition system deenergized. The material shall be considered saturated when the material is thoroughlyso
32、aked with fuel and at the point just before fuel begins to pool in the bottom of the drum.12.3 At the completion of the fuel oil saturation, as described in 12.2, the burner ignition means shall bereenergized and the burner allowed to fire into the open drum for a period of one minute and then shall
33、be shut down for one minute. Five trials of on/off operation shall be conducted.JANUARY 31, 2008 SUBJECT 2576 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL12.4 The refractory combustion chamber liner material shall not exhibit noticeable d
34、egradation or effectthat would hinder the performance of the liner.12.5 Observation of each specimen should not show any disintegration or noticeable loss of structuralstrength.13 Water Saturation Test13.1 A representative sample of the refractory combustion chamber liner material shall be installed
35、 in anopen drum. The open drum shall be sized accordingly to the burner selected, in accordance with 7.1, andproperly vented to the outdoors.13.2 The material shall be saturated with water. The material shall be considered saturated when thematerial is thoroughly soaked with water and at the point j
36、ust before water begins to pool in the bottom ofthe drum.13.3 At the completion of the water saturation, as described in 13.2, the burner shall be allowed to fireinto the refractory combustion chamber liner for 30 minutes.13.4 The refractory combustion chamber liner material shall not exhibit notice
37、able degradation or effectthat would hinder the performance of the liner.13.5 Observation of each specimen should not show any disintegration or noticeable loss of structuralstrength.14 Flame Impingement Test14.1 A representative sample of the refractory combustion chamber liner material shall be in
38、stalled in anopen drum. The open drum shall be sized accordingly to the burner selected, in accordance with 7.1, andproperly vented to the outdoors.14.2 The burner shall be allowed to fire and the flame shall be directed to allow abnormally close flameimpingement of the refractory combustion chamber
39、 liner for one hour. Impingement is defined as amajority of the flame cone being in contact with the liner material. After the one hour duration ofimpingement, the burner shall be redirected to allow normal operation within the combustion chamber forone hour.14.3 The refractory combustion chamber li
40、ner material shall not exhibit noticeable degradation or effectthat would hinder the performance of the liner.14.4 Observation of each specimen should not show any disintegration or noticeable loss of structuralstrength.JANUARY 31, 2008SUBJECT 25768UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
41、REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMANUFACTURING AND PRODUCTION TESTS15 General15.1 To determine compliance with these requirements in production, the manufacturer of the refractoryliner material shall check and inspect the formulation.15.2 Factory inspections shall include the fo
42、llowing:a) Inspection of all raw materials;b) Inspection of the refractory combustion chamber liner to determine compliance withmanufacturing specifications;MARKING16 General16.1 The refractory combustion chamber liner or shipping container shall be plainly marked with thefollowing information:a) Th
43、e name of the manufacturer or the trademark; a distinctive catalog number or theequivalent; the date of manufacture; and a factory identifier, if the product is manufactured atmore than one location. The date and factory identifier may be in code;b) The types of appliances and/or fuels that may be f
44、ired with the refractory combustionchamber liner; andc) The thickness and density of the refractory combustion chamber liner.16.2 For cautionary markings, signal words (DANGER,WARNING, and CAUTION) shall be printedin letters not less than 7/64 inch (2.8 mm) high and the remainder of the notice shall
45、 be printed in lettersnot less than 3/32 inch (2.4 mm) high. Markings shall be located so as to be readily visible duringinstallation and/or replacement of the liner material and servicing of the combustion chamber.16.3 The exterior surface of each Refractory Combustion Chamber Liner shall be perman
46、ently markedwith the statement CAUTION and the following or equivalent statement, “Care should be taken duringcleaning or servicing of the appliance to prevent damage to the refractory combustion chamber linermaterial.”JANUARY 31, 2008 SUBJECT 2576 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
47、 REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINSTRUCTIONS17 General17.1 A copy of the manufacturers installation instructions intended to accompany each refractorycombustion chamber liner, as produced, is to be used as a guide in the examination and test of theproduct.17.2 The instructions
48、 shall include such directions and information as deemed by the manufacturer to benecessary to cover the intended installation, maintenance, and use of the product. Instructions shallinclude at least the following:a) Name and address of the manufacturer;b) Catalog number or other equivalent designat
49、ion;c) Statement that installation is to be performed by a qualified installer and will comply with allthe requirements of the authority having jurisdiction over the appliance installation;d) Detailed instructions on maintenance and service procedures of the liner;e) A general arrangement drawing illustrating method of mounting/installation; andf) Repetition of all cautionary markings (see 16.1).JANUARY 31, 2008SUBJECT 257610
