ASME A112.19.17 pdf free download
ASME A112.19.17 pdf free download Manufactured Safety Vacuum Release Systems (SVRS) for Residential and Commercial Swimming Pool, Spa, Hot Tub, and Wading Pool Suction Systems
1.1 Scope
This Standard establishes general requirements, dimen-sions and tolerances,materials， installation instructions,testing requirements, and markings and identification forSVRs devices. sVRs devices are intended to be utilized onpool,spa. hot tub, and/or therapy unit suction systems.svRs devices covered under this Standard are designed torelieve high vacuum occurrences that cause human bodyor body part suction entrapment.
Demonstration of compliance with this Standard ismerely an indication that the product meets the perfor-mance requirements and specifications contained in thisStandard.
The provisions of this Standard are not intended toprevent the use of any alternative material or method ofconstruction, 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 thelnternational System of Units (SI. The U.s. Customaryunits shall be considered as the standard.
In this Standard, gallons (U.S. liquid]) per minute isabbreviated as “gpm”and liters (metric liquid]) per minuteis abbreviated as”L/min”.
1.3 References
The following documents form a part of this Standard tothe extent specified herein. Unless otherwise specified, thelatest edition shall apply.
ASME A112.19.8b-2009，Suction Fittings for Use inSwimming Pools,Spas,Hot Tubs,and whirlpool BathAppliances.
ASME B1.20.1,Pipe Threads, General Purpose,Inch
Publisher: The American Society of Mechanical Engineers(ASME) Three Park Avenue, New York, NY 10016-5990;Order Department: 22 Law Drive,P.O.Box 2900 Fair-field, NJ 07007-2900, (www.asme.org)
ASTM D 2466,Poly (Vinyl Chloride) (PVC) Plastic PipeFittings.Schedule 40
ASTM D2468，Acrylonitrile-Butadiene-Styrene (ABS)Plastic Pipe Fittings, Schedule 40
Publisher: American Society for Testing and Materials(ASTM International),100 Barr Harbor Drive, P.O.BoxC700, west Conshohocken, PA 19428-2959
(www.astm.org)
NSF-50, Suction System Components For Swimming Pools,Spas,Tubs,And whirlpools
Publisher: National Science Foundation (NSF Interna-tional),789 North Dixboro Road, Ann Arbor, MI 48105(www.nsf.gov)
1.4 Definitions blocking element: the part used to simulate an entrapped victim constructed ofa 12 in. (305 mm) × 12 in. (305 mm) (tolerance = ± 0.25 in.) maximum 5 in. (127 mm) thick closed cell foam block with a covering of Buna-N rubber sheet having a minimum of 1 / 8 in. (3 mm) thickness and Shore A durometer 60 ± 5 or equivalent whose combined buoyancy force is between 14.0 lbf (62.2 N) and 15.0 lbf (66.7 N). cycle: a sequence where the SVRS activates, latches, or locks out in the vented or safe position following a high vacuum occurrence and then is automatically or manually reset. floodedsuction: a pool, spa, hot tub, wading pool, or similar appliance whose circulation system pump suction inlet or inlets are located below the static water level in the appliance (flooded suction). high vacuum occurrence: an event where the operating vacuum normally present within a pool circulation system increases due to a full suction outlet blockage.
Safety Vacuum Release System (SVRS): a system or device capable of automatically providing vacuum release at a suction outlet caused by a high vacuum occurrence due to a suction outlet flow blockage. The device or system provides vacuum release with or without suction fitting cover(s) in place. suction lift: a pool, spa, hot tub, wading pool, or similar appliance whose circulation system pump suction inlet or inlets are located above the static water level in the appliance (nonflooded suction).
suction outlet: an appurtenance within a pool, spa, hot tub, wading pool, or similar appliance for conveying water into a circulating system; i.e., a pump suction. suction system: that portion of the circulation piping located between the pool suction outlet and the inlet side of the pump and usually includes the following: main suction outlet piping, skimmer piping, and/or vacuum piping.
2 REQUIREMENTS
2.1 General
2.1.1 Field‐adjustable SVRS devices when provided with a vacuum gauge shall have a maximum graduation of 1 / 2 in. (13 mm) Hg increments to aid in calibration and trouble shooting.
2.1.2 Where SVRS devices are capable of field adjust- ment to site‐specific hydraulic conditions, the means for effecting adjustments shall be tamper resistant, so that nonqualified personnel cannot make adjustments inad- vertently.
