1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJuly 24, 20171UL 2351AOutline of Investigation for Nozzle Adaptors with Integral Filter for FireProtection ServiceIssue Number: 1July 24, 2017Summary of TopicsThis first issue of the Outline of I
2、nvestigation for Nozzle Adaptors withIntegral Filter for Fire Protection Service, UL 2351A, covers requirementsfor nozzle adaptors with integral filter for use in water spray fixed systemsfor fire protection service.ULs Outlines of Investigation are copyrighted by UL LLC. Neither a printed norelectr
3、onic copy of an Outline of Investigation should be altered in any way. All ofULs Outlines of Investigation and all copyrights, ownerships, and rights regardingthose Outlines of Investigation shall remain the sole and exclusive property of ULLLC.COPYRIGHT 2017 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHOR
4、IZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJULY 24, 2017UL 2351A2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Units of Measurement .43 Components 44 References
5、.55 Glossary .5CONSTRUCTION6 General 67 Rated Pressure .68 Materials .6PERFORMANCE9 General .710 Hydrostatic Strength Test 711 Clogging Test .712 Equivalent Length Determination 813 Discharge Coefficient Determination 914 Flow Endurance Test .1115 30-Day Corrosion Tests .1115.1 General .1115.2 20 Pe
6、rcent salt spray .1215.3 Moist hydrogen sulfide air mixture 1215.4 Moist carbon dioxide-sulfur dioxide air mixture .1216 90-Day Moist Air Test 1217 Elastomeric Parts (Except Gaskets) Test 13MARKINGS18 General .13INSTALLATION INSTRUCTIONS19 General 14JULY 24, 2017 UL 2351A 3UL COPYRIGHTED MATERIAL NO
7、T AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover nozzle adaptors with filter for use in water spray fixed systems intendedfor fire protection service.1.2 Requirements for installation of water spray systems are included in
8、 the Standard for Water SprayFixed Systems for Fire Protection, NFPA 15. Water spray fixed systems are intended to be inspected,tested and maintained in accordance with the Standard for the Inspection, Testing and Maintenance ofWater-Based Fire Protection Systems, NFPA 25.2 Units of Measurement2.1 V
9、alues stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.3 Components3.1 Except as indicated in 3.2, a component of a product covered by this Outline of Investigation shallcomply with the requirements for that component.3.2 A component is
10、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.3.3 A component shall be used
11、in accordance with its rating established for the intended conditions ofuse.3.4 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 notexceeding specifie
12、d limits, and shall be used only under those specific conditions.JULY 24, 2017UL 2351A4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4 References4.1 Any undated reference to a code or standard appearing in the requirements of this Outline of
13、Investigation, shall be interpreted 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 DISCHARGE COEFFICIENT K Coefficient of discharge in the formula,in which:Q is the flow in gallons per minute, andp is the
14、 pressure in pounds per square inch gauge.In SI units:Q is the flow in liters per minute; andp is the pressure in bar5.3 FILTER An element of a nozzle adaptor assembly that provides a level of protection against nozzleclogging.5.4 NOZZLE ADAPTOR WITH INTEGRAL FILTER (NOZZLE ADAPTOR or ADAPTOR) A dev
15、icedesigned to reduce the potential for an orifice or orifices of a water spray nozzle to become obstructedduring discharge.5.5 RATED PRESSURE The maximum working pressure intended to be applied to the nozzle adaptorwith integral filter.JULY 24, 2017 UL 2351A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED
16、FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONSTRUCTION6 General6.1 A nozzle adaptor shall have a minimum 1/2-inch (12.7-mm) nominal inlet connection and minimum1/4-inch (6.3 mm) nominal outlet connection.6.2 Threaded connections shall be in accordance with the Standard for Pi
17、pe Threads, General Purpose(Inch), ANSI/ASME B1.20.1, or other national pipe thread standards.6.3 The openings in the filter of a nozzle adaptor shall be constructed to restrict the passage of a spherewith a diameter that is not more than 80 percent of the smallest water passageway of the nozzles in
18、tendedfor use with the adaptor.6.4 The open area of the filter of a nozzle adaptor shall be not less than 4 times the area of the waterpassageway of the nozzles intended for use with the adapter.7 Rated Pressure7.1 A nozzle adaptor shall have a rated pressure of 175 psig (1.21 MPa) or greater.8 Mate
19、rials8.1 The nozzle adaptor including the filter shall be constructed of materials with corrosion resistance atleast equivalent to brass, bronze, or Series 300 stainless steel.8.2 Nozzle adaptor components including the filter that are made of a copper alloy containing more than15 percent zinc shall
20、 comply with the Dezincification Test of Brass Parts and Stress-Corrosion CrackingOf Brass Sprinkler Parts Test referenced in the Standard for Automatic Sprinklers for Fire-ProtectionService, ANSI/UL 199.8.3 Nozzle adaptor components including the filter that are made of austenitic stainless steel s
21、hall complywith the Stress-Corrosion Cracking of Stainless Steel Sprinkler Parts Test referenced in the Standard forAutomatic Sprinklers for Fire-Protection Service, ANSI/UL 199.JULY 24, 2017UL 2351A6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FR
22、OM ULPERFORMANCE9 General9.1 Representative samples of the nozzle adaptors with integral filter are to be subjected to the testsdescribed in these requirements.10 Hydrostatic Strength Test10.1 A nozzle adaptor shall withstand, without leakage or rupture, a hydrostatic pressure applied to thepressure
23、 retaining components equal to four times the rated pressure for a period of 5 minutes.10.2 A representative sample is to be filled with water in a manner that all entrapped air is vented. Theinlet of the device is to be hydrostatically pressurized at a rate not exceeding 300 psig (2.07 MPa) perminu
24、te until the required test pressure in 10.1 is achieved. The test sample is to be visually examined forleakage and rupture during the test.11 Clogging Test11.1 A nozzle adaptor with integral filter shall show no evidence of clogging that would increase the inletpressure required to flow water throug
25、h adaptor by more than 10 percent when exposed to continuouslyflowing water, contaminated in accordance with 11.4, at a test pressure not less than 60 psig (414 KPa).11.2 A sample of the nozzle adaptor with filter having the smallest open area shall be subjected to thistest. During testing, the filt
26、er shall not be flushed, removed, or cleaned. Refer to the Standard for WaterMist Nozzles for Fire Protection Service, ANSI/UL 2167 for a diagram of a typical test apparatus.11.3 Prior to conducting the clogging test, the flow rate of water through the nozzle adaptor with integralfilter is to be mea
27、sured with a nozzle inlet pressure as described in 11.1. Following the 30 minutes of flowwith contaminated water, the pressure required to achieve the same flow rate initially measured throughthe nozzle adaptor shall not increase by more than 10 percent of the original pressure value.11.4 The water
28、and contaminant solution used for the clogging test is to be mixed in a proportion of 60L (15.9 gal) of tap water with the weight of contaminants as described in Table 11.1. The solution is to becontinuously agitated during the test.JULY 24, 2017 UL 2351A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
29、FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 11.1Contaminant for clogging testSieve designation Nominal sieveopening, mmGrams of contaminant (5 percent)Pipe scale Top soil SandNo. 25 0.706 0 456 200No. 50 0.297 82 82 327No. 100 0.150 84 6 89No. 200 0.074 81 0 21No. 325 0.043 1
30、53 0 3Total 400 544 640NOTE - Sieve designations correspond with those specified in the Standard Specification for Wire-Cloth Sieves for TestingPurposes, ASTM E11. Cenco-Meinzer sieve sizes 25 mesh, 50 mesh, 100 mesh, 200 mesh, and 325 mesh, corresponding withthe number designation in the table, hav
31、e been found to comply with ASTM E11.12 Equivalent Length Determination12.1 When tested as described in 12.2 and 12.3, the pressure loss of associated with the nozzle adaptorfilter protruding into the water supply piping, expressed in equivalent length of Schedule 40 pipe in thesame nominal size as
32、the inlet connection, shall not be more than the equivalent length values publishedin the installation instructions.12.2 A sample of each nozzle adaptor with integral filter shall be tested with each size and type of supplypipe and fittings intended for use with the adaptor as referenced in the manu
33、facturers installationinstructions. A piezometer is to be installed on each side of a supply pipe tee and connected to adifferential pressure measuring device. With the nozzle adaptor plugged, water flow through thepiezometers is to be measured using a flow-measuring device.12.3 At least five differ
34、ent water flows at velocities between 10 and 18 ft/sec (3.1 and 5.5 m/s) basedupon the nominal inside diameter of the supply piping are to be established through the test sample andthe pressure drop between piezometers at each flow is to be recorded. The calculated pressure loss fromthe piezometers,
35、 corrected for the inlet and outlet velocities as applicable, are to be subtracted from thetest sample results to obtain a pressure drop associated with the nozzle adaptor filter protruding into thesupply piping. Using the Hazen-Williams coefficient of friction of 120, the equivalent length, in feet
36、 (m) ofpipe, is to be calculated.JULY 24, 2017UL 2351A8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL13 Discharge Coefficient Determination13.1 When tested as specified in 13.2 13.4, an adaptor shall not reduce the K-factor of a nozzleintend
37、ed for use with the adaptor by more than 10 percent.13.2 Water spray nozzles having K-factors that are representative of those intended for use with theadaptor are to be installed on an outlet from a water reservoir sized so that the velocity head effect (V2/2g) is reduced to approach a velocity of
38、zero. The outlet is to consist of a pipe coupling of a sizecorresponding with the size of the test sample thread, as described in the Standard for Pipe Threads,General Purpose (Inch), ANSI/ASME B1.20.1. The test apparatus shall consist of a nominal six-inch blankflange drilled and threaded to the ap
39、propriate thread size, and attached to a six-inch pipe. See Figure 13.1for an example of this apparatus. In addition, an adaptor intended for installation in an elbow is to betested with the elbow inlet connected to water supply piping having the same nominal size as the elbowinlet.13.3 The nozzles
40、are to be initially tested to determine their K-factor. The combination of the adaptor andnozzles are then to be tested with fittings that are representative of those intended for use with the adaptorincluding both tees and elbows, if intended for use with both.13.4 The test sample is to be flow tes
41、ted first at a pressure of 7 psig (48 kPa) and then at 10 psig (69kPa). Following this, the pressure is to be increased in 5 psig (34 kPa) increments up to 50 psig (345 kPa),in 10 psig (69 kPa) increments up to and including 75 psig (517 kPa) less than the rated pressure,decreased in 10 psig (69 kPa
42、) increments down to 50 psig (345 kPa), in 5 psig (34 kPa) increments downto 10 psig (60 kPa), and then decreased to 7 psig (48 kPa). The flow at each increment of pressure is tobe measured by a flow-measuring device having an accuracy of within 2 percent of the actual flow. Thedischarge coefficient
43、 K is to be calculated by dividing the flow in gallons per minute (L/min x 3.78) bythe square root of the pressure in psig (bar x 14.5). The average discharge coefficient K is then to becalculated.This is generated text for figtxt.JULY 24, 2017 UL 2351A 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FU
44、RTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure 13.1Example of Discharge Coefficient Determination Test ApparatusJULY 24, 2017UL 2351A10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL14 Flow Endurance Test14.1 A nozzle adap
45、tor with integral filter shall withstand for 30 minutes, without evidence of cracking,deformation, or separation of any part, a water flow at a pressure equal to the rated pressure plus 25 psig(172 kPa).14.2 A representative nozzle adaptor or adaptors with a nozzle having the largest K-factor intend
46、ed foruse with the adaptor are to be installed in a tee in their intended installation orientation and connected toa pressurized water system having a supply pipe with a minimum nominal diameter of 1 inches. Thewater flow through the nozzle is to be increased to obtain the test pressure specified in
47、 14.1 and thenmaintained for 30 minutes.15 30-Day Corrosion Tests15.1 General15.1.1 The discharge coefficient of a combination of the largest nozzle and nozzle adaptor with thesmallest filter size shall not decrease more than 5 percent of the original value after exposure to salt spray,hydrogen sulf
48、ide, and carbon dioxide-sulfur dioxide atmospheres referenced in 15.1.2 - 15.4.1 for 30 days.Prior to and following each exposure, the combination of the largest nozzle and nozzle adaptor with thesmallest filter shall be subjected to the Discharge Coefficient Determination, Section 13 to compare the
49、measured K-factors.15.1.2 More than 24 hours after the exposure period, each sample is to be connected to the nozzle andsubjected to the Discharge Coefficient Determination, Section 13 to determine the K-factor after theexposure.15.1.3 Three sample nozzle adaptors with the smallest filter are to the subjected to this test. One sampleis to be exposed to 20 percent salt spray, the second to hydrogen sulfide, and the third to sulfurdioxide-carbon dioxide.15.1.4 CAUTION - Hydrogen sulfide and sulfur dioxide are both toxic gases. Hydrogen sulfide gas is alsoflammab
