# 10 CFR § 429.51 - Commercial pre-rinse spray valves.

§ 429.51 Commercial pre-rinse spray valves.

(a) Sampling plan for selection of units for testing.

(1) The requirements of § 429.11 apply to commercial prerinse spray valves; and

(2) For each basic model of commercial prerinse spray valve, a sample of sufficient size must be randomly selected and tested to ensure that any represented value of flow rate must be greater than or equal to the higher of:

(i) The mean of the sample, where:

$\stackrel{—}{x}=\frac{1}{n}\sum _{i=1}^{n}{x}_{i}$

and, x
is the sample mean;
n is the number of samples; and
xi is the i th sample; Or,

(ii) The upper 95-percent confidence limit (UCL) of the true mean divided by 1.10, where:

$\mathrm{UCL}=\stackrel{—}{x}+{t}_{.95}\left(\frac{s}{\sqrt{n}}\right)$

and, x
is the sample mean;
s is the sample standard deviation;
n is the number of samples; and
t0.95 is the t statistic for a 95-percent two-tailed confidence interval with n-1 degrees of freedom (from Appendix A of this subpart).

(b) Certification reports.

(1) The requirements of § 429.12 are applicable to commercial prerinse spray valves; and

(2) Pursuant to § 429.12(b)(13), a certification report must include the following public product-specific information: The flow rate, in gallons per minute (gpm), rounded to the nearest 0.01 gpm, and the corresponding spray force, in ounce-force (ozf), rounded to the nearest 0.1 ozf.

[76 FR 12451, Mar. 7, 2011; 76 FR 24779, May 2, 2011, as amended at 78 FR 62986, Oct. 23, 2013; 80 FR 81453, Dec. 30, 2015; 81 FR 4801, Jan. 27, 2016]