ASME A112.1002 pdf download.Anti-siphon fill valves for water closet tanks.
1.2
In ASME A112.1002, “shall is used to express a requirement, Le., a provision that the user is obliged to satisfy in order to comply with the standard; ‘should” Is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.
Notes to tables and figures are considered part of the table or figure and may be written as requirements.
Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.
SI units are the units of record in Canada. In this Standard the inch/pound units are shown in parentheses.
The values stated in each measurement system are equivalent in application; however, each system is to be used independently. Combining values from the two measurement systems can result in nonconformance with this Standard,
All references to gallons are to U.S. gallons.
4.5.2 Test conditions
The test shall be conducted with water at a
a) temperature of 21 ± 5 .C (70 ± 10 F);
b) supply pressure of 620 kPa (90 psi) minimum and
c) flowing pressure of 480 kPa (70 psi) minimum.
4.5.3 Procedure
The life cycle test shall be conducted as follows:
a) Install the fill valve in a tank in accordance with the manufacturer’s Instructions.
b) The water in the tank may be displaced to accelerate the test.
c) Operate the fill valve for 150,000 cycles by filling the tank for each cycle. Cycle duration shall not exceed 1 mm.
d) Increase the static pressure to 860 ± 14 kPa (125 ± 2 psi) for 5 mm ± 15 s.
e) Check the fill valve for leakage, distortion, or other damage that could affect its performance.
4.5.4 Performance criteria
There shall be no leakage, distortion, or other damage that affects the fill valve’s performance. The refill tube shall remain in place on the fill valve throughout the test.
4.6 Critical level and backflow prevention tests
4.6.1 Purpose
The purpose of this test is to verify the critical level (CL) marking, and ensure that the backflow prevention features function as intended.
4.6.2 Procedure
4.6.2.1 Set-up
4.6.2.1.1 Test water
Manually fill the test tank to the level required with clear or coloured water at 10 ± 6 .C (50 t 10 F).
When coloured water is used it shall be prepared separately as follows:
a) Add methylene blue dye powder to water in a concentration of approximately 1.5 g/L (0.013 lb/gal) and mix thoroughly.
b) Mix the solution in Item a) with water in a ratio of 5 mL/L (0.64 oz/gal).
4.6.2.1.2 Check member fouling
All check members of the specimen shall be fouled using a 0.81 ± 0.10 mm (0.032 ± 0.004 in) diameter fouling wire as follows:
a) On check members that are hinged, the wire shall be placed in the 90 quadrant opposite to the hinge point or point of suspension.
b) On check members that move axially, the wire shall be placed at a single point on the seating area. The fouling wire shall follow the cross-sectional contour of the check member.
c) When devices have other types of moving parts for check members, those parts shall be spaced so as to comply with the intent of this Clause.
4.6.2.3.2 Procedure to determine the critical level location The critical level location shall be determined as follows:
a) Lower the water level in the tank to 3.00 ±0.25 mm (0.12 ± 0.01 in) below the
1) atmospheric vent(s), in the case of fill valves with vacuum-breakers; or
2) water discharge opening, in the case of fill valves with air•gaps.
b) Apply a vacuum of 85 ± 4 kPa (25.0 ± 1 inHg) to the specimen while the water level in the tank iS gradually lowered at a rate of 5 mm/30 s (0.2 in/30 5).
c) Record the elevation at which backsiphonage ceases (B8 in Figure 3).
d) Lower the water level to 25 +0—2-5 mm (1 +0 —0.1 In) below mark BB.
e) Apply a vacuum of 85 ± 4 kPa (25.0 ± 1 inHg) to the specimen as the water level In the test tank Is gradually raised at a rate of S mm/30 s (0.2 in/30 s).
f) Record the elevation at which backsiphonage begins (AA in Figure 3),
g) Determine the lower elevation (PA or BB) as the critical level.
h) If water fails to appear In the sight glass, the device shall be Installed as shown In Figure 2 and tested according to the procedure specified in Clause 4.6.2.2.2 and retested to meet the requirements of Clause 4.6.2.3.
ASME A112.1002 pdf download
