ASME A112.19.8A-2008 pdf free download.Addenda to ASME A112.19.8-2007 Suction Fittings for Use in Swimming Pools, Wading Pools, Spas, and Hot Tubs
3.2 Ultraviolet Light Exposure
Test Either Test Method 1 or TestMethod 2 may be utilized. Test Method 1 is suited for products small enough to fit into the UV test chamber, while Test Method 2 is suitable for all products. If Test Method 1 is used, then the ultraviolet test as well as all the structural tests, are performed on the complete (as sold) samples. If Test Method 2 is used, then the ultraviolet test is performed on “dogbone” samples molded per ASTM D 638 from the same resin as the final production samples. The tensile strength and Izod impact tests are performed on two sets of the “dogbone” samples, set A is nonexposed and set B is exposed to the ultraviolet test. In addition, all the applicable structural tests (paras. 3.3 through 3.8) are also performed on the complete (as sold) virgin samples. The performance requirements for those tests, however, will be adjusted per para.
3.2.2.3 of this Standard. EXCEPTION: Manufactured sumpsand otherfittingcomponents that are not exposed to natural UV radiation when fully assembled and installed, according to the manufacturer’s instruction, shall not be required to be included in the Ultraviolet Light Exposure Test.
3.2.1 Test Method 1. Twelve new fitting specimens shall be exposed to ultraviolet light and water spray in accordance with either (a) 720 hr of twin enclosed carbon-arc (ASTM G 153, Table X1.1 Cycle 1), (b) 1,000 hr of xenon-arc (ASTM G 155, Table X3.1 Cycle 1), or (c) 750 hr of fluorescent (ASTM G 154, Table X2.1 Cycle 1).
3.2.1.1 Test Method 1. Specimens shall be mounted inside the test apparatus, with exposed sur- faces of the specimens facing the UV lamps and positioned so they receive exposure approximating a fully assembled and installed cover/grate fitting. After the exposure test, the specimens shall be removed from the test apparatus and rejected if signs of deterioration such as cracking or crazing appear. Discoloration shall not be cause for rejection. They shall then be retained under conditions of ambient room temperature and atmospheric pressure for not less than 16 hr and not more than 96 hr before being subjected to the following tests:
(a) Deflection Tests
(b) Point Load to Protrusion Test
(c) Shear Load Test
(d) Vacuum and Point Impact Test
(d) Pull Load Test The intensification factor K shall be 1.0 for UV Test Method 1. The exposed specimen shall be permitted to be trans- ported from one laboratory to another, provided time requirements are met.
3.2.1.2 Performance Requirement. All the specimens that were subject to the UV Test Method 1 shall comply with all performance requirements of the structural integrity tests in paras.
3.3 through 3.8.
3.2.2 Test Method 2. Samples of the fitting polymeric materials shall be exposed to ultraviolet light in accordance with the options specified in para.
3.2.1(a), (b), or (c), Test Method 1, and then to the tests specified in paras.
3.2.2.1 and 3.2.2.2. 3.2.2.1 Tensile Strength. Samples of virgin mate- rial (A) and UV-exposed material (B) shall be evaluated for tensile strength as described in the Standard Test Method for Tensile Properties of Plastics, ANSI/ASTM D 638 (ISO 527-2) using Type 1 specimens of 0.125 in. ± 0.02 in. (3.2 mm ± 0.4 mm) thickness and testing speed of 0.2 in./min (5.1 mm/min) ± 25%. The tensile strength is to be that at the yield point if the material yields, otherwise at break.
3.2.2.2 Izod Impact. Samples of virgin material (A) and UV-exposed material (B) shall be evaluated for impact strength as described in Method A of the Stan- dard Test Methods for Impact Resistance of Plastics and Electrical Insulating Materials, ASTM D 256 or ISO 180, using 0.125-in. (3.2-mm) thick specimen. 3.2.2.3 Performance Requirement. Samples of the material shall retain at least 70% of the unconditioned (virgin) value when the tests indicated in paras.
3.2.2.1 and 3.2.2.2 are performed. An intensification factor K shall be defined as the inverse of the lowest retained proportion. The applicable structural integrity tests, i.e., paras. 3.3, 3.4, 3.5, 3.6, 3.7, and 3.8, will be conducted on the complete (as sold) non-UV exposed samples at loadings equal tothe basevalues multipliedbythe intenification factor, K. For example, if 80% of the tensile strength is retained in para. 3.2.2.1, and 85% of the Izod unit energy is retained, then K p 1 ⁄ 0.80 p 1.25. This will ensure that adequate strength remains after service aging.ASME A112.19.8A pdf download.ASME A112.19.8A-2008 pdf free download
