ASME A112.19.17 pdf download

ASME A112.19.17 pdf download MAMUFACTURED SAFETY VACUUM RELEASE SYSTEMS (SVRS) FOR RESIDENTIAL AND MMMERCIAl SWIMMINC POO1 POO1 SUCTION SYSTEMS
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1GENERAL
1.1 Scope
This Standard establishes general requirements,dimensions and tolerances,materials,installationinstructions,testing requirements, and markings andidentification for SvRs devices.svRs devices areintended to be utilized on pool, spa, hot tub, and/ortherapy unit suction systens.SvRs devices coveredunder this Standard are designed to prevent high vac-uum occurrences that cause human body or body partsuction entrapment.
Demonstration of compliance with this Standard ismerely an indication that the product meets the perform-ance requirements and specifications contained in thisStandard. The responsibility for verification of thedevice’s performance on any circulation system shall bethe responsibility of the design professional.
The provisions of this Standard are not intended toprevent the use of any alternative material or methodof construction, provided any such alternative meets theintent and requirements of this Standard.
1.2 Units of Measurement
Values are stated in U.S. customary units and in theInternational System of Units (SI).The U.S. customaryunits shall be considered as the standard.
In this Standard, gallons (U.S. liquid) per minute isabbreviated gpm and liters (metric liquid) per minuteis abbreviated L/min.
1.3 References
The following documents form a part of this Standardto 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,InchPublisher: The American Society of Mechanical Engi-neers (ASME International), Three Park Avenue, NewYork, NY 10016-5990; Order Department: 22 LawDrive,Box 2300,Fairfield, NJ 07007-2300
ASTM D 2466, Poly (Vinyl Chloride) (PVC) Plastic PipeFittings,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 SwimmingPools,Spas,Tubs, and Whirlpools
Publisher: National Sanitation Foundation (NSF Inter-national),789 North Dixboro Road,PO. Box 130140,Ann Arbor, MI 48113-0140
UL-1081,Standard for Safety for Swimming PoolPumps, Filters, and Chlorinators
Publisher: Underwriters Laboratories Inc.(UL),333 Pfin-gsten Road, Northbrook,IL 60062-2096
1.4Definitions
blocking element: the part used to simulate an entrappedvictim constructed of a 12 in. × 12 in. (305 mm x 305mm) maximum 5 in. (127 mm) thick closed cell foamblock whose buoyancy force does not exceed 15 lb(6.8 kg).
cycle: a sequence where the svRS latches or locks outin the vented or safe position following a high vacuumoccurrence and then is manually reset.
drain outlet: an appurtenance for conveying water outof a pool, spa, hot tub, therapy unit, or similar appliance.end connection: the point of attachment of the sVRSdevice to the suction system piping.
high vacuum occurrence: an event where the operatingvacuum normally present within a pool circulation sys-tem suddenly increases due to a suction outlet blockage.hydrostatic valve: a check valve found within a swimmingpool main drain sump which allows ground water toflow into the pool if the hydrostatic pressure below thesump becomes greater than the pressure inside the pool.readily affixed: to be easily retrofitted to existing systemswhere an entrapment hazard is possible using approvedpipe fittings and/or approved adapters.