1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFebruary 22, 20081SUBJECT 327AOUTLINE OF INVESTIGATIONFORINFERENTIAL TYPE RESIDENTIAL WATER FLOW METERSIssue Number 3February 22, 2008Summary of TopicsThis new issue of Subject 327A, Outline of I
2、nvestigation for InferentialType Residential Water Flow Meters is being issued to revise therequirements for strainer screen openings.The UL Foreword is no longer located within the UL Standard. For informationconcerning the use and application of the requirements contained in thisStandard, the curr
3、ent version of the UL Foreword is located onULStandardsInfoNet at: http:/ 2008 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFEBRUARY 22, 2008SUBJECT 327A2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZ
4、ED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Components 43 Units of Measurement .44 Undated References 55 Glossary .5CONSTRUCTION6 General 57 Sizes 68 Rated Pressure .69 Materials .69.1 Nonmetallic materials .69.2 Metallic materials .69.3 Coati
5、ngs for ferrous bodies 710 Strainers 7PERFORMANCE11 General .712 Nonmetallic Materials Test 712.1 Plastic or other nonmetallic parts (excluding rubber and synthetic elastomers) 712.2 Elastomeric parts .1013 Leakage Test 1114 Hydrostatic Test 1115 Hydraulic Friction Loss Test 1116 Calibration Test .1
6、117 Endurance Test 1218 Tests on Organic Coating Materials .1218.1 General .1218.2 Air oven exposure 1218.3 Water immersion .1318.4 Sodium chloride immersion 1318.5 Potassium biphthalate immersion .1318.6 Sodium carbonate immersion 1418.7 Impact test 14MANUFACTURING AND PRODUCTION TESTS19 General 14
7、MARKING20 General 14INSTRUCTIONS21 Installation and Design Instructions .15FEBRUARY 22, 2008 SUBJECT 327A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover the construction and performance of infe
8、rential type residential waterflowmeters intended for use on cold water supplies when:a) Connected directly to residential sprinkler fire protection systems; orb) Connected to combined domestic plumbing and residential sprinkler fire protection service(multipurpose fire protection system) when insta
9、lled as specified in the Standard for theInstallation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes,NFPA 13D.2 Components2.1 Except as indicated in 2.2, a component of a product covered by this Outline of Investigation shallcomply with the requirements for that compone
10、nt.2.2 A component is not required to comply with a specific requirement that:a) Involves a feature or characteristic not required in the application of the component in theproduct covered by this Outline of Investigation; orb) Is superseded by a requirement in this Outline of Investigation.2.3 A co
11、mponent 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 performance capabilities.Such components are intended for use only under limited conditions, such as certain temperatures
12、 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 parentheses are explanatory orapproximate information.FEBRUARY 22, 2008SUBJECT 327A4UL COPYRIGHTED MATERIAL NOT AUTHORIZED
13、 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 outline shall beinterpreted as referring to the latest edition of that code or standard.5 Glossary5.1 For the purpose of these
14、requirements, the following definitions apply.5.2 INFERENTIAL FLOW METER A water volume measuring device where the flow volume isbased on the approximately linear and direct relationship between the rotational velocity of a multi-vanerotary device (impeller), and the rate of water flow through the m
15、eter. These meters include turbine,single jet and multi-jet types.5.3 MULTI-JET TYPE FLOW METER A type of turbine type flow meter that passes water throughseveral tangential orifices around the circumference of a cylindrical measuring chamber creating severaljets that are directed onto the impeller
16、vanes mounted on a vertical spindle, causing the impeller torotate, and exits the measuring chamber through another set of tangential orifices positioned at adifferent level in the measuring chamber.5.4 SINGLE JET TYPE FLOW METER A type of a turbine type flow meter having one largeopening at the inl
17、et that gradually reduces in diameter, creating a stream or jet of water that isdirected onto the impeller vanes mounted on a vertical spindle within a cylindrical cavity, causing theimpeller to rotate.5.5 TURBINE TYPE FLOW METER A water volume measuring device that passes 100 percent ofthe water th
18、rough a single chamber where a multi-vane rotary device (impeller) is driven by the waterflow striking the vanes, to indicate the volume that passes through the device.CONSTRUCTION6 General6.1 Meters shall be equipped with integral strainers or shall be provided with strainers as part of the meteras
19、sembly. Integral strainer assemblies shall comply with the requirements for Strainers, Section 10 andstrainers equipped as part of the meter assembly shall be Listed for Fire Protection Service.FEBRUARY 22, 2008 SUBJECT 327A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBU
20、TION WITHOUT PERMISSION FROM UL7 Sizes7.1 Meters are to be constructed for use with standard pipe of nominal size 3/4 through 2 inch.7.2 Meter sizes refer to the nominal diameter of the waterway through the inlet and outlet connectionsand to the pipe size for which the connections are intended.8 Rat
21、ed Pressure8.1 Meters shall be constructed for a minimum rated pressure of 175 psig.Exception: Meters intended for application in multipurpose piping systems as specified in the Standardfor the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes,NFPA 13D shall b
22、e permitted to be rated 130 psig or higher.9 Materials9.1 Nonmetallic materials9.1.1 A plastic or other nonmetallic part, other than rubber parts such as seals and O rings, is to bejudged on the basis of:a) Mechanical strength;b) Water absorption;c) Resistance to deterioration due to aging; andd) Vo
23、lumetric and dimensional changes. See 12.1.1.1 12.1.2.2.9.1.2 A rubber part or synthetic elastomer of such type used in a meter assembly is to be judged on thebasis of tensile strength, elongation, and resistance to aging. See 12.2.1.9.2 Metallic materials9.2.1 Meter bodies fabricated from copper al
24、loys shall contain not more than 15 percent zinc.9.2.2 Meter bodies fabricated from cast iron shall at least comply with the requirements of StandardSpecification for Gray Iron Castings, ASTM A48/A48M or Standard Specification for Gray Iron Castingsfor Valves, Flanges, and Pipe Fittings, ASTM A126.9
25、.2.3 Meter bodies fabricated from steel shall at least comply with Standard Specification for Steel, Sheetand Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy and High-Strength Low-Alloy withImproved Formability, ASTM A1011/A1011M.FEBRUARY 22, 2008SUBJECT 327A6UL COPYRIGHTED MATERIAL N
26、OT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL9.3 Coatings for ferrous bodies9.3.1 Meter bodies fabricated from ferrous materials shall be protected by hot-dip galvanizing inaccordance with Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware
27、, ASTMA153/A153M or protected with organic coatings when evaluated to determine compliance with Section 18.10 Strainers10.1 Screen size openings shall not have rectangular dimensions or diameters less than 0.03 nor morethan 0.14 inch.10.2 The surface area of the screen openings shall be not less tha
28、n a ratio of 4 to 1 of the cross-sectionalarea of Schedule 40 steel pipe for the nominal meter size.10.3 The material for the screen is to be corrosion resistant such as brass, bronze, stainless steel, orplastic, so that corrosion does not decrease the size of the screen openings.PERFORMANCE11 Gener
29、al11.1 Representative samples of meters are to be subjected to the tests described in these requirements.Additional representative samples of parts constructed of metallic, nonmetallic material, such as rubberseals, are required for physical and chemical tests.12 Nonmetallic Materials Test12.1 Plast
30、ic or other nonmetallic parts (excluding rubber and synthetic elastomers)12.1.1 Air oven aging of moving parts12.1.1.1 After air-oven aging for 90 days at 100 1C (212 2F):a) There shall be no warping, creeping, cracking, or other evidence of deterioration of a plasticor other like non-metallic compo
31、nent that may impair the intended operation of the meter.b) The izod impact strength shall not be reduced by more than 30 percent.c) A meter assembled with aged components shall comply with the requirements in theCalibration Test, Section 16.12.1.1.2 The izod impact strength tests are to be conducte
32、d in the as received and aged conditions inaccordance with Standard Test Methods for Determining the Izod Pendulum Impact Resistance ofPlastics, ASTM D256.12.1.1.3 If a material cannot withstand the temperature specified in 12.1.1.1 without excessive softening,distortion, or deterioration, an air-ov
33、en aging test at a lower temperature for a longer period of time shallbe conducted. If a material can withstand a higher temperature than specified in 12.1.1.1 withoutFEBRUARY 22, 2008 SUBJECT 327A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FRO
34、M ULexcessive softening, distortion, or deterioration, an air-oven aging test at a higher temperature for ashorter period of time shall be permitted. The duration of exposure is to be calculated from the followingequation:D = (92,000)e0.0693tin which:D is the test duration in days; andt is the test
35、temperature in degrees C.12.1.1.4 Plastic or other like non-metallic parts, and sample components to be aged, are to be supportedin a full draft, circulating air oven that has been preheated to 100 1C (212 2F) or the calculatedtemperature in 12.1.1.3. Samples shall be supported so that they do not t
36、ouch one another or the sidesof the oven. The samples are to be aged for the required time period, at full draft, and then allowed tocool in air at 23 2C (73 4F) for at least 4 hours before any test or dimensional check is conducted.Prior to any tests, rubber parts complying with the requirements in
37、 12.2.1 and 12.2.2 are to be installedin the meter, if they are not included in the aging test. As used in this test, the term full draft refers tothe air flow over the samples in the oven with the oven air inlet and outlet full open. The number of airchanges in the oven is to be between 4 and 6 per
38、 minute.12.1.2 Water aging of moving parts12.1.2.1 After immersion in tap water at 87 2C (188 4F) for 90 days:a) There shall be no warping, creeping, cracking, or other signs of deterioration of a plastic orother like non-metallic component, that may impair the intended operation of the meter.b) The
39、 izod impact strength shall not be reduced by more than 30 percent.c) A meter assembled with aged components shall comply with the requirements in CalibrationTest, Section 16.12.1.2.2 If a material cannot withstand the temperature specified in 12.1.2.1 without excessive softening,distortion, or dete
40、rioration, a water aging test at a lower temperature for a longer period of time shall bepermitted. The duration of exposure is to be calculated from the following formula:D = (37,000)e0.0693tin which:D is the exposure duration in days; andt is the test temperature in degrees C.FEBRUARY 22, 2008SUBJ
41、ECT 327A8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL12.1.3 Air oven aging of stationary parts12.1.3.1 After air-oven aging for 90 days at 100 1C (212 2F):a) There shall be no warping, creeping, cracking, or other evidence of deterioration
42、 of a plasticor other like non-metallic component that may impair the intended operation of the meter.b) A meter assembled with aged components, shall be operated at its maximum continuousflow for a period of 1 hour without malfunction or deterioration as indicated by a change in thehydraulic fricti
43、on loss value exceeding 1 psi of an as received (unaged) sample at a flowvelocity of 15 ft/s based on Schedule 40 steel pipe for the nominal meter size.12.1.3.2 If a material cannot withstand the temperature specified in 12.1.3.1 without excessive softening,distortion, or deterioration, an air-oven
44、aging test at a lower temperature for a longer period of time shallbe conducted. If a material can withstand higher temperature than specified in 12.1.3.1 without excessivesoftening, distortion, or deterioration, an air-oven aging test at a higher temperature for a shorter periodof time shall be per
45、mitted. The duration of exposure is to be calculated from the following equation:D = (92,000)e0.0693tin which:D is the test duration in days; andt is the test temperature in degrees C.12.1.3.3 Plastic or other like non-metallic parts, and sample components to be aged, are to be supportedin a full dr
46、aft, circulating air oven that has been preheated to 100 1C (212 2F) or the calculatedtemperature in 12.1.1.3. Samples shall be supported so that they do not touch one another or the sidesof the oven. The samples are to be aged for the required time period, at full draft, and then allowed tocool in
47、air at 23 2C (73 4F) for at least 4 hours before any test or dimensional check is conducted.Prior to any tests, rubber parts complying with the requirements in 12.2.1 and 12.2.2 are to be installedin the meter, if they are not included in the aging test. As used in this test, the term full draft ref
48、ers tothe air flow over the samples in the oven with the oven air inlet and outlet full open. The number of airchanges in the oven is to be between 4 and 6 per minute.FEBRUARY 22, 2008 SUBJECT 327A 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FRO
49、M UL12.1.4 Water aging of stationary parts12.1.4.1 After immersion in tap water at 87 2C (188 4F) for 90 days:a) There shall be no warping, creeping, cracking, or other signs of deterioration of a plastic orother like non-metallic component that may impair the intended operation of the meter.b) A meter assembled with aged components, shall be operated at its maximum rated flow fora period of 1 hour without signs of malfunction or deterioration as indicated by a change in
