1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMay 19, 20111SUBJECT 246BOUTLINE OF INVESTIGATIONFORTamper Resistant Features of Hydrants for Fire-Protection ServiceIssue No. 1May 19, 2011COPYRIGHT 2011 UNDERWRITERS LABORATORIES INC.UL COPYRIG
2、HTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMAY 19, 2011SUBJECT 246B2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Components 43 Units of
3、Measurement .44 Undated References 4CONSTRUCTION5 Design Features 5PERFORMANCE6 Attack Test .57 Normal Operation Test 68 Variable Ambient Test .69 Corrosion Exposure Tests 69.1 General .69.2 Salt spray (fog) .69.3 Moist hydrogen sulfide (H2S) air mixture 79.4 Moist carbon dioxide (CO2)-sulfur dioxid
4、e (SO2) air mixture 710 Ultraviolet Light and Water Exposure Test 711 Gaskets and Seals used in Tamper Resistant Features 812 Dust Test .813 Humidity Test .814 Endurance Test 815 External Icing Test .9MARKING16 General .9MAY 19, 2011 SUBJECT 246B 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER R
5、EPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 This Outline covers requirements for evaluating the tamper resistant features of fire hydrants thathave been evaluated and comply with all applicable requirements of the Standard for Hydrants for FireProtection Service, UL 2
6、46.2 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 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
7、 application of the component in theproduct covered by this Outline of Investigation; orb) Is superseded by a requirement in this Outline of Investigation.2.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.2.4 Specific components are incomplete
8、in construction features or restricted in 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 pa
9、rentheses are the requirement. Values in parentheses are explanatory orapproximate information.4 Undated References4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted as referring to the latest edition of that code or standard.MAY 19, 20
10、11SUBJECT 246B4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONSTRUCTION5 Design Features5.1 Tamper resistant features of a hydrant shall be designed such that they do not result in a significantdelay of the intended operation of the hydran
11、t or allow access by breaching the body. See clause 7,Normal Operation Test and clause 6, Attack Test.PERFORMANCE6 Attack Test6.1 A hydrant with tamper resistant features shall, for a period of 5 minutes:a) For Wet Barrel Hydrants, not permit removal of the caps and not permit operation of thehydran
12、t to begin; or permit making a hole opening in any surface of the hydrant using the toolsspecified in 6.4 and 6.5, orb) For Dry Barrel Hydrants, not permit removal of the caps and not permit operation of thehydrant to begin or; not permit making a hole opening in any surface of the hydrant using the
13、tools specified in 6.4 and 6.5 and not permit operation of the hydrant to begin.6.2 A hole size opening referenced in 6.1 is defined as an opening that is 1 inches (25.4 mm) in diameteror larger, or an opening through which a 1 inch (25.4 mm) diameter sphere would pass.6.3 Several separate attacks s
14、hall be permitted to be conducted against the hydrant. The attacks arepermitted to be directed against the caps, the body, the locking mechanism, and any part of the hydrantabove the indicated “bury” line.6.4 The hand tools permitted to be used in the attack tests include hammers, chisels, pry bars,
15、 punches,screwdrivers, and wrenches (adjustable, socket and fixed open and closed-end type). The hammers shallnot exceed 3 pounds (1.36 kg) in head weight, and no hand tool is to exceed 18 inches (457 mm) inlength.6.5 The power tool permitted to be used in the attack tests shall be a variable speed
16、electric drill withcarbide tip and high-speed drill bits not exceeding 1/4 inch (6.4 mm) diameter.6.6 The hydrant shall be positioned as intended for use, and the attack performed by one operator whois familiar with its construction. Only the components in the location above the indicated “bury line
17、” of thehydrant shall be subjected to the attack procedure.6.7 After being subjected to the conditions described in 6.2 6.6, a hydrant shall not be required tofunction.MAY 19, 2011 SUBJECT 246B 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL
18、7 Normal Operation Test7.1 The hydrant with tamper resistant features shall be able to be operated as intended using the hydrantwrench provided by the manufacturer from the fully closed position to the fully opened position and backto the fully closed position without delaying operation of the hydra
19、nt in excess of 30 seconds. Anyindividual hydrant cap shall be able to be removed without a delay in excess of 30 seconds.7.2 The hydrant shall be mounted in the intended manner, in accordance with the manufacturersinstallation instructions.8 Variable Ambient Test8.1 A hydrant shall comply with the
20、Normal Operation Test, clause 7, after the tamper resistant featuresare exposed to ambient temperatures of minus 35 and plus 66C (minus 31 and plus 151F).8.2 A sample device shall be conditioned at the temperatures specified in 8.1 for a minimum of 4 hoursand subjected to the Normal Operation Test.9
21、 Corrosion Exposure Tests9.1 General9.1.1 A hydrant shall comply with the Normal Operation Test after the tamper resistant features areexposed to the Salt Spray (fog) described in 9.2, the Moist hydrogen sulfide (H2 S) - air mixture in 9.3and the Moist carbon dioxide (CO2)-sulfur dioxide (SO2)-air m
22、ixture in 9.4 for 30 days.9.1.2 One sample hydrant or the tamper resistant assembly shall be individually exposed to each of thefollowing atmospheres. If tamper resistant assemblies are used, they shall be re-installed in a hydrantprior to the Normal Operation Test.9.2 Salt spray (fog)9.2.1 The appa
23、ratus for salt spray (fog) testing is to consist of a fog chamber having inside dimensionsof 48 by 30 by 36 inches (1.2 by 0.8 by 0.9 m), a salt-solution reservoir, a supply of conditionedcompressed air, a dispersion tower that produces a salt fog, constructed in accordance with the Standardfor Meth
24、od of Salt Spray (Fog) Testing, ASTM B117, sample supports, provision for heating the chamber,and necessary means of control.9.2.2 The dispersion tower is to be located in the center of the chamber and shall be supplied withhumidified air at a pressure of 17 to 19 psig (117 to 131 kPa) so that the s
25、alt solution is aspirated as afine mist or fog into the interior of the chamber.9.2.3 The salt solution is to consist of 5 percent by weight of common salt sodium chloride (NaCl) anddistilled water. The pH value of the collected solution shall be between 6.7 and 7.2, at a specific gravityof 1.0255 t
26、o 1.0400 at 25C (77F). The temperature of the chamber shall be maintained at 35 plus 1 orminus 2C (95 plus 2 or minus 3F) throughout the test.MAY 19, 2011SUBJECT 246B6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL9.2.4 Drops of solution that
27、 accumulate on the ceiling or cover of the chamber shall be diverted fromdropping onto the samples and drops of solution that fall from sample are not to be re-circulated but areto be removed by a drain located at the bottom of the chamber.9.3 Moist hydrogen sulfide (H2S) air mixture9.3.1 The test s
28、ample shall be supported in a closed chamber having openings for gas inlet and outlet.9.3.2 Hydrogen sulfide (H2S) shall be supplied to the test chamber from a commercial cylinder containingthis gas under pressure. An amount of hydrogen sulfide equivalent to 1 percent of the volume of the testchambe
29、r shall be introduced into the chamber each working day, but prior to the introduction of the gaseseach day, the gas remaining from the previous day is to be purged from the chamber. A small amount ofwater shall be maintained at the bottom of the chamber for humidity. The chamber shall be maintained
30、 atroom temperature during the test period.9.4 Moist carbon dioxide (CO2)-sulfur dioxide (SO2) air mixture9.4.1 The test sample shall be supported in a closed chamber having openings for gas inlet and outlet.A water jacket and a thermostatically controlled heater shall be provided to maintain a temp
31、erature of 351C (95 3F).9.4.2 Sulfur dioxide (SO2) and carbon dioxide (CO2) shall be supplied to the test chamber fromcommercial cylinders containing these gases under pressure. An amount of sulfur dioxide equivalent to 1percent of the volume of the test chamber, and an equal volume of carbon dioxid
32、e shall be introduced intothe chamber each working day; but prior to the introduction of the gases each day, the gas remaining fromthe previous day is to be purged from the chamber. A small amount of water shall be maintained at thebottom of the chamber for humidity.10 Ultraviolet Light and Water Ex
33、posure Test10.1 Polymeric materials and rubber compounds used in the tamper resistant features of a hydrant thatis subject to direct exposure to outdoor environments shall be subjected to the exposure 10.2 10.4, andshall comply with the Normal Operation Test.10.2 Five samples shall be subjected to u
34、ltraviolet light (carbon arc or equivalent) and water spray for1000 hours as described in 10.3 and 10.4.10.3 The apparatus used is to provide ultraviolet light from two enclosed electric arcs formed betweenvertical carbon electrodes 1/2 inch (12.7 mm) in diameter, located at the center of a revolvin
35、g verticalmetal cylinder, that is 31 inches (787 mm) in diameter and 17-3/4 inches (451 mm) high. The currentthrough the arcs is to be approximately 15 to 17 amperes AC and the potential across the arcs is to beapproximately 120 to 145 volts. The arcs shall be enclosed by clear globes of No. 9200-PX
36、 Pyrex glass.10.4 The samples are to be mounted vertically on the inside of the cylinder, facing the arcs, and thecylinder is to be rotated around the arcs at one revolution per minute. A system of nozzles is to beprovided so that each sample is sprayed in turn with water as the cylinder revolves. D
37、uring each20-minute operating cycle, each sample shall be exposed only to light from the arcs for 17 minutes andto both water spray and light for 3 minutes. The temperature within the cylinder while the apparatus is inoperation shall be 63 5C (145 9F).MAY 19, 2011 SUBJECT 246B 7UL COPYRIGHTED MATERI
38、AL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL11 Gaskets and Seals used in Tamper Resistant Features11.1 Gaskets and seals used on the tamper resistant features of a hydrant shall comply with therequirements for Elastomeric Parts specified in the Standard for Hy
39、drants for Fire Protection Service, UL246.12 Dust Test12.1 A hydrant shall comply with the Normal Operation Test after the tamper resistant features areexposed to dust as described in 12.2.12.2 To determine compliance with the requirement in 12.1, a sample in its intended mounting positionshall be p
40、laced in an airtight chamber having an internal volume of at least 3 cubic feet (0.085 m3).Approximately at 2 ounces (0.06 kg) of cement dust, maintained at 20 50 percent relative humidity andcapable of passing through a 200 mesh screen, is to be circulated for 1 hour by means of compressed airor a
41、blower so as to completely envelop the sample in the chamber. The airflow shall be maintained at anair velocity of approximately 50 feet per minute (0.25 m/s).12.3 Following the exposure to dust, the tamper resistant features shall be removed from the chamberand mounted in its intended position, and
42、 subjected to the Normal Operation Test, clause 7.13 Humidity Test13.1 A hydrant shall comply with the Normal Operation Test after the security feature is exposed for 24hours to air having a relative humidity of 85 5 percent and a temperature of 30 2C (86 3F).14 Endurance Test14.1 A hydrant shall co
43、mply with the Normal Operation Test after the tamper resistant features are cycledas specified in 14.2 and 14.3.14.2 The tamper resistant features of a hydrant are to be operated as intended by completely removingthe feature from the hydrant and re-installing it to the locked position for 1000 cycle
44、s.14.3 The tamper resistant features of a hydrant shall be cycled at a rate not exceeding 4 cycles perminute.MAY 19, 2011SUBJECT 246B8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL15 External Icing Test15.1 A hydrant shall comply with the No
45、rmal Operation Test after the hydrant, complete with the tamperresistant features, without functional damage to the hydrant or the tamper resistant features after beingexposed to the conditions in 15.2 except that the delay in operation or removal of the caps shall notexceed 60s.15.2 The hydrant sha
46、ll be mounted in a test chamber capable of being conditioned at minus 7C (20F).The hydrant shall be positioned 45 +/-5 degrees from the vertical below spraying apparatus such that thehydrant is covered in the discharge of water above the indicated “bury” line. A metal test bar 25.4 mm indiameter by
47、600 mm long (1 inch in diameter and 2 feet long) shall be mounted in a horizontal position ina location where it will receive the same water spray as the hydrant.15.3 The water discharged onto the hydrant shall be between 0C (32F) and 3C (37F) at a dischargedensity of 40 80 L/h/m2 (1 2 gpm per squar
48、e foot) of area. After the chamber air temperature isstabilized at 2+/-1C (35F), the water spray shall be discharged for at least 1 hour, maintaining thechamber temperature. At the end of the period, the chamber air temperature shall be reduced to between- 7C (20F) and minus 3C (27F) while continuin
49、g the water spray. (The rate of change in the roomtemperature is not critical and shall be whatever is obtainable with the cooling means of the apparatus.)15.4 The water spray shall be controlled to cause ice to build up on the test bar at a rate of approximately6.35 mm per hour (1/4 inch per hour) and shall be continued until 20 mm (3/4 inch) of ice has formed onthe top surface of the bar. The spray shall then be discontinued and the chamber air temperature shall bemaintained between minus 7C (20F) and minus 3C (27F) for 3 hours.15.5
