1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJanuary 17, 20131UL 1321OUTLINE OF INVESTIGATIONFORPOLYTETRAFLUOROETHYLENE PLASTIC SEAL MATERIALSIssue Number: 6JANUARY 17, 2013Summary of TopicsThis new issue of UL 1321 is being issued to:a) Re
2、vise the time required to pressurize the assembly to 5minutes to verify an initial seal in paragraph 7.2.5, andb) Clarify the intent of paragraph 7.5.3 to reflect that for a leakingassembly the 336 hours begins once an attempt is made to sealthe joint by retightening.COPYRIGHT 2013 UNDERWRITERS LABO
3、RATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJANUARY 17, 2013UL 13212No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .4CON
4、STRUCTION2 General 43 Application Instructions 44 Units of Measurement .45 Undated References 5PERFORMANCE6 General 57 Assembly Construction and Initial Pressure Testing .57.1 Test assemblies 57.2 Construction of assemblies 57.3 Tests for liquid fuel applications 87.4 Test for propane applications 9
5、7.5 Test for 300 psig (2070 kPa) natural gas applications .98 Sprinkler System and Water Spray System Tests RESERVED 109 Electrical Resistance at Joints .10MARKING10 General 10SUPPLEMENT SA E25A AND E85A TEST FLUIDSSA1 Details .SA1SUPPLEMENT SB B20 and B99.9/B100 Test FluidsSB1 Details .SB1JANUARY 1
6、7, 2013 UL 1321 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements are for use in the investigation of polytetrafluoroethylene plastic in the form oftape with a minimum width of 1/2 inch (12.7 mm), or in
7、 the form of cord, where the product is intended tomake threaded metal pipe joints tight against leakage. These products are evaluated when applied inaccordance with the manufacturers instructions, to male threads of metal pipe assemblies. The productsare rated for use in equipment intended to handl
8、e gasoline, gasoline/ethanol blends, diesel fuel,biodiesel/diesel fuel, biodiesel, naphtha, benzene, kerosene, petroleum oils, natural gas, propane, orbutane as specified by the manufacturer.1.2 This outline of investigation does not cover the classification of the product in regard to itsflammabili
9、ty, the toxicity of the product or its vapors due to flammability, or the effect of normalatmospheric conditions on the product while in storage or in use.1.3 If requested, tape narrower than 1/2 inch (12.7 mm) or the sealing of threaded joints in pipe sizeslarger than 1-1/2 inches may be investigat
10、ed using appropriate adaptation of tests described in Sections7 9. Tests for uses other than those indicated are not within the scope of these requirements.CONSTRUCTION2 General2.1 The thickness and density range of the material shall be specified by the manufacturer.3 Application Instructions3.1 A
11、copy or draft of the application instructions intended to accompany each product as produced is tobe used as a guide in the examination and testing of the product.3.2 The instructions shall include such directions and information deemed to be adequate for obtainingproper use of the product.4 Units o
12、f Measurement4.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.JANUARY 17, 2013UL 13214UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5 Undated References5.1 Any undated
13、 reference to a code or standard appearing in the requirements of this outline ofinvestigation shall be interpreted as referring to the latest edition of that code or standard.PERFORMANCE6 General6.1 Sealed pipe assemblies required for the following tests shall be made using tape or cord applied ina
14、ccordance with the manufacturers printed instructions.7 Assembly Construction and Initial Pressure Testing7.1 Test assemblies7.1.1 Pipe assemblies are to be constructed in accordance with 7.1.2 7.1.4, from commercial gradeSchedule 40, minimum, malleable iron pipe and fittings (ANSI B16.3).7.1.2 The
15、fittings used are to be threaded with tapered pipe threads cut in accordance with ASMEB1.20.1 NPT tapered pipe thread.7.1.3 The mating male and female thread patterns are to be checked for evidence of damage to threadsand with regard to tolerance with ring and plug gauges manufactured in accordance
16、with ASME B1.20.1.Only pipe and fittings that show no significant evidence of thread damage and that comply with ASMEB1.20.1 tolerances shall be used to construct assemblies.7.1.4 Prior to assembly, thread patterns are to be cleaned thoroughly with a suitable degreasing solventto the extent that all
17、 traces of oil, grease, dirt, or rust are removed. Then the assembly shall be allowedto air dry at room temperature.7.2 Construction of assemblies7.2.1 The test assemblies are to be constructed for each end-use application using one tee of the largestpipe size required for testing, a reducing bushin
18、g, pipe nipple, bell reducer to -inch pipe size, -inch pipenipple, -inch tee and -inch pipe nipple, with all open fittings closed with a plug as illustrated in Figure7.1.This is generated text for figtxt.JANUARY 17, 2013 UL 1321 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDIST
19、RIBUTION WITHOUT PERMISSION FROM ULFigure 7.1Pipe assembly diagramJANUARY 17, 2013UL 13216UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.2.2 For an assembly intended to be used for evaluation of the product for 300 psig (2070 kPa) naturalga
20、s applications, the ” plug in the ” tee shall be replaced with a ” nipple approximately 8 “ long.7.2.3 The product under test is to be applied to the male threads of the joints in accordance with themanufacturers instructions using the minimum number of wraps specified by the manufacturer. Themaximu
21、m number of wraps to be used to evaluate a product supplied in the form of tape is 5.7.2.4 The assembly joints are to be tightened to the torque specified in Table 7.1.Table 7.1Torque requirements for pipe thread (NPT) connectionsNominal pipe size,aTorque,inches pounds-inches / foot-pounds (Nm)1/8 1
22、50 /12.5 (16.9)1/4 250 / 21 (28.3)3/8 450 / 38 (51.9)1/2 800 / 67 (90.4)3/4 1000 / 83 (113.0)1 1200 / 100 (135.5)1-1/4 1450 / 121 (163.8)1-1/2 1550 / 129 (175.1)2 1650 / 138 (186.4)aANSI/ASME B1.20.17.2.5 Each assembly shall be checked to verify an initial seal by pressurizing the assembly for 5 min
23、uteswith air in a room temperature water bath to 300 psig (2070 kPa) or the maximum pressure to which it willbe subjected when charged with the test medium, whichever is greater. If leakage is noted that cannot bestopped by retightening the joint to the torque specified above, the joint shall be dis
24、assembled andinspected. If defects in the threads, pipe or fittings are evident, the test shall be considered invalid andshall be repeated with an assembly constructed of new pipe and fittings. If no defects in the threads arenoted, the product shall be removed from both male and female threads and
25、the joint shall bereassembled with a new application of product in accordance with the manufacturers instructions and theprescribed torque. If it is again not possible to obtain an initial seal and no defects in the threads, pipe, orfittings are evident, further testing shall be discontinued.JANUARY
26、 17, 2013 UL 1321 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.3 Tests for liquid fuel applications7.3.1 A pipe assembly constructed and initially tested as described in 7.1.1 7.2.5 shall not lose morethan 5 milliliters of fuel when test
27、ed as described in 7.3.2 7.3.5 and then shall withstand a pressure of300 psig (2070 kPa) for 15 minutes without showing visible evidence of leakage as described in 7.3.5.7.3.2 For gasoline and gasoline/ethanol blend applications up to 10% ethanol, the assembly is to be filledto a predetermined level
28、 approximately 1 inch (25.4 mm) from the top of the assembly with a measuredamount of ASTM Reference Fuel H and connected in the vertical position to a header. The assembly shallbe maintained in the vertical position throughout the test period. The header is to be provided with anair-pressure gauge
29、and connected through pressure reducers to a compressed air line. The pressurereducer is to be adjusted to supply a pressure of 75 psig (517 kPa) to the header and pipe assembly.7.3.3 If leakage is observed at any of the joints within 24 hours, the assembly shall be disconnected fromthe header, empt
30、ied of fuel, and the leaking joints retightened to the prescribed torque with care taken notto disturb the remaining joints. The assembly shall then be refilled with test fuel, connected to the header,and the pressure reapplied. If leakage is not stopped with this further tightening, unacceptableper
31、formance shall be recorded and testing shall be discontinued.7.3.4 If no initial leakage is observed during the 24-hour period following sealing or re-sealing, thepressure is to be maintained at 75 psig (517 kPa) for a total of 240 hours, during which time periodicobservations are to be made for evi
32、dence of leakage.7.3.5 At the end of the 240-hour period, the assembly is to be carefully depressurized to prevent suddenoutgassing of air and loss of fuel, after which it shall be removed from the header and the amount of fuelneeded to restore the original level shall be measured.7.3.6 The assembly
33、 shall then be emptied of fuel, filled with water and subjected to a pressure of 300 psig(2070 kPa) for 15 minutes during which time it shall be observed for leakage.7.3.7 Acceptable test performance with respect to testing with ASTM Reference Fuel H is considered tocover also the suitability of the
34、 product for use with naphtha, benzene, kerosene, and petroleum oils.7.3.8 For E25 applications (ethanol/gasoline blends from 0 to 25% ethanol), the product shall beevaluated in accordance with 7.3.1 7.3.6 using the E25a test fluid in place of ASTM Reference Fuel H.For E85 applications (ethanol/gaso
35、line blends from 0 to 85% ethanol), the product shall be evaluated inaccordance with 7.3.1 7.3.6 in two separate assemblies, one filled with E25a test fluid and the otherfilled with E85a test fluid in place of ASTM Reference Fuel H. The formulation of these test fluids isdescribed in E25a and E85a T
36、est Fluids, Supplement SA. To establish an E85 rating, the product shallcomply with the maximum fuel loss requirement with both test fluids. Acceptable test performance withrespect to testing with E25a test fluid is considered to cover also the suitability of the product for use withgasoline, naphth
37、a, benzene, kerosene, and petroleum oils.7.3.9 For B20 applications (biodiesel/diesel fuel blends from 0 to 20% biodiesel), the product shall beevaluated in accordance with 7.3.1 7.3.6 using FB25a test fluid in place of ASTM Reference Fuel H. ForB99.9 B100 applications (biodiesel), the product shall
38、 be evaluated in accordance with 7.3.1 7.3.6using B100a test fluid in place of ASTM Reference Fuel H. The formulation of these test fluids is describedin B20 and B99.9/B100 Test Fluids, Supplement SB. Acceptable test performance with respect to testingwith FB25a is considered also to cover the suita
39、bility of the product for use with diesel fuel.JANUARY 17, 2013UL 13218UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.4 Test for propane applications7.4.1 A pipe assembly constructed and initially tested as described in 7.1.1 7.2.4 shall no
40、t lose morethan 1.9 g after 168 hours and 3.7 g after 336 hours when tested as described in 7.4.2 7.4.5. Acceptabletest performance is considered also to cover the suitability of this product for use with natural gas at apressure not exceeding 100 psig (690 kPa) and butane.7.4.2 The sealed assembly
41、shall be cooled in a cold chamber to a temperature of minus 30 to minus 40C(minus 22 to minus 40F) and then filled to about 3/4 capacity with liquefied propane. The assembly shallbe sealed with the product using a ” cap.7.4.3 After being filled and closed, each assembly shall be allowed to stand at
42、room temperature for 4hours and then immersed in water at room temperature. If leakage is observed at any of the joints within24 hours, the leaking joints are to be retightened to the prescribed torque, with care taken not to disturbthe other joints. The test shall be continued regardless of whether
43、 a seal was achieved.7.4.4 The assembly shall be blotted dry with a towel and allowed to stand at room temperature until aconstant weight is achieved but not more than 4 hours, and then weighed and placed for 168 hours in awell-ventilated room maintained at a temperature of 23.0C (73.4F). This tempe
44、rature corresponds to apressure of 116 psig (800 kPa) for propane. The assembly shall be weighed at the end of this period, orprior to it if significant leakage is noted. If propane loss exceeds 1.9 g, unacceptable performance shall berecorded and the tests shall be discontinued.7.4.5 If after 168 h
45、ours the assembly weight loss is 1.9 g or less, the assembly shall be placed in achamber maintained at a temperature of 48.9C (120F) for 168 hours. This temperature corresponds toa pressure of 225 psig (1552 kPa) for propane. At the end of this time or prior to it if significant leakageis noted, the
46、 assembly shall be weighed to determine the loss of propane. If at any point the total propaneloss exceeds 3.7 g, the test shall be discontinued.7.5 Test for 300 psig (2070 kPa) natural gas applications7.5.1 A pipe assembly constructed and initially tested as described in 7.1.1 7.2.4 shall not have
47、leakedmore than 3100 milliliters of gas over a period of 336 hours when tested as described in 7.5.2 7.5.4.7.5.2 The assembly shall be connected at the side arm to a source of methane and placed in a verticalposition in a water bath maintained at 23.0C (73.4F). A water-filled, inverted, graduated cy
48、linder of 2-litercapacity and a funnel of sufficient size to collect all bubbles of escaping gas shall be mounted in the bathabove the assembly. The assembly shall then be pressurized with methane to 450 psig (3100 kPa) andobserved for leakage.7.5.3 If leakage is observed within the first 24 hours,
49、an attempt shall made to seal the assembly bydisconnecting it from the methane, retightening the leaking joints to the prescribed torque, placing theassembly back in the water bath and re-pressurizing it for 336 hours, disregarding leakage prior toretightening. The test shall be continued regardless of whether a seal was achieved.7.5.4 At the end of 336 hours, or before, if necessary, the volume of gas collected shall be determinedafter equalizing the water level in the cylinder to the level of water in the bath. If leakage appr
