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ASME A112.19.17-2002 pdf download

1 GENERAL 1.1 Scope This Standard establishes general requirements, dimensions and tolerances, materials, ins tallation instnictions, testing requirements, and markings and identification for SVRS devices. SVRS devices are intended to be utilized on pool, spa, hot tub, and/or therapy unit suction systems. SVRS devices covered under this Standard are designed to prevent high vac- uum occurrences that cause human body or body part suction entrapment. Demonstration of compliance with this Standard is merely an indication that the product meets the perform- ance requirements and specifications contained in this Standard. The responsibility for verification of the device’s performance on any circulation system shall be the responsibility of the design professional. The provisions of this Standard are not intended to prevent the use of any alternative material or method of construction, provided any such alternative meets the intent and requirements of this Standard. 1.2 Units of Measurement Values are stated in U.S. customary units and in the International System of Units (SI). The U.S. customary units shall be considered as the standard. In this Standard, gallons (U.S. liquid) per minute is abbreviated gpm and liters (metric liquid) per minute is abbreviated L/min. 1.3 References The following documents form a part of this Standard to the extent specified herein. Unless otherwise speci- fied, the latest edition shall apply. ASME A112.19.8M, Suction Fittings for Use in Swim- ming Pools, Wading Pools, Spas, Hot Tubs, and Whirl- pool Bath Appliances ASME B1.20.1, Pipe Threads, General Purpose, Inch Publisher: The American Society of Mechanical Engi- neers (ASME International), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300 ASTM D 2466, Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40 ASTM D 2468, Acrylonitrile-Butadiene-Styrene (ABS) Plastic Pipe Fittings, Schedule 40 Publisher: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 NSF-50, Suction System Components for Swimming Pools, Spas, Tubs, and Whirlpools Publisher: National Sanitation Foundation (NSF Inter- national), 789 North Dixboro Road, P.O. Box 130140, Ann Arbor, MI 4.8113-0140 UL-1081, Standard for Safety for Swimming Pool Publisher: Underwriters Laboratories Inc. (UL), 333 Pfin- Pumps, Filters, and Chlorinators gsten Road, Northbrook, IL 60062-2096 1.4 Definitions blocking element: the part used to simulate an entrapped victim constructed of a 12 in. X 12 in. (305 mm x 305 mm) maximum 5 in. (127 mm) thick closed cell foam block whose buoyancy force does not exceed 15 Ib (6.8 kg). cycle: a sequence where the SVRS latches or locks out in the vented or safe position following a high vacuum occurrence and then is manually reset. drain outlef: an appurtenance for conveying water out of a pool, spa, hot tub, therapy unit, or similar appliance. end connection: the point of attachment of the SVRS device to the suction system piping. high vacuum occurrence: an event where the operating vacuum normally present within a pool circulation sys- tem suddenly increases due to a suction outlet blockage. hydrostatic valve: a check valve found within a swimming pool main drain sump which allows ground water to flow into the pool if the hydrostatic pressure below the sump becomes greater than the pressure inside the pool. readily afixed: to be easily retrofitted to existing systems where an entrapment hazard is possible using approved pipe fittings and/or approved adapters.
3.2 Time Versus Vacuum Response Test 3.2.1 SVRS devices shall be preconditioned as described in paras. 3.3 and 3.4 prior to being subjected to vacuum response versus time tests, with the device placed at distances of 25 ft to 200 ft (7.6 m to 61.0 m) in 25 ft (7.6 m) increments, from a circulating pump suction. These tests are to be performed at 60 gpm (227 L/min), or at the maximum flow rate produced by the pump, or at the flow rate that produces the maximum vacuum level recommended by the SVRS manufacturer. Perform the tests in para. 3.2.2 and/or para. 3.2.3 on an 8-in. diameter suction outlet sump, once with a flat grate installed and once without a cover or grate installed, piped with 2-in. diameter suction piping by blocking the suction outlet using the test actuator described below. Test Actuator. A mechanical test actuator shall support a blocking element centered on the vertical axis of the suction outlet sump with a minimum of 6 in. (152 mm) between the top of the sump and the bottom of the blocking element. The test actuator shall lower the blocking element at a rate not to exceed 6 in./sec (152 mm/s) onto the top of the sump. The test actuator must immediately cease downward force at the moment contact is made at the sump and allow the blocking element to move vertically free. (See Fig. 3 for a general schematic of the test actuator.)

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