ASME A112.19.17:2002 pdf free download

ASME A112.19.17:2002 pdf free download MANUFACTURED SAFETY VACUUM RELEASE SYSTEMS (SVRS) FOR ,RESIDENTIAL AND 7 COMMERCIAL SWII\i1MING POOL, SPA, HUT TU!B, AND WADING POOL SUCTION SYSTEMS
1GENERAL1.1 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 systems.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
ASTMD2468,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 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.hrydrostatic valve: a check valve found within a swimmingpool main drain sump which allows ground water tofow 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.
Safety Vacuum Release System: a system or device capableof providing vacuum release at a suction outlet causedby a high vacuum occurrence due to a suction outletflow blockage, by either venting the circulation system to atmosphere.turning off the circulating pmp,rorreversing circulating flow. The device or system vides vacuum release with or without suction fittingcover(s) in place.
submerged suction: a pool,spa，hot tub, wading pool,or similar appliance whose circulation system pumpsuction inlet or inlets are located below the static waterlevel in the appliance (flooded suction).
suction lift: a pool, spa, hot tub, wading pool, or similar appliance whose circulation system pump suction inletor inlets are located above the static water level in theappliance (nonflooded suction).
suction outlet: an appurtenance for conveying water intoa circulating system; i.e., a pump suction within a pool,spa, hot tub, wading pool,or similar appliance.
suction system: that portion of the circulation pipinglocated between the pool suction outlet and the inletside of the pump and usually includes the following:main outlet piping, skimmer piping, vacuum piping,and surge tank piping.
2REQUIREMENTS2.1 General
2.1.1 Field-adjustable SVRS devices shall be pro-vided with a vacuum gauge graduated in 1% in. (13 mm)Hg increments with an accuracy of +1 in. (25 mm) ofHg to provide continuous indication of system vac-uum level.
2.1.2 Where SVRSdevices are capable of field adjust-ment to site-specific hydraulic conditions, the means foreffecting adjustments shall be tamper resistant, so thatnonqualified personnel cannot make adjustments inad-vertently.
2.1.3 sVRs devices shall be designed for on-site ser-vicing and testing.
2.1.4sVRs devices shall either vent to atmosphere,or shut off the circulating pump, or reverse the circulat-ing system flow following a high vacuum occurrence.