(a) Each request for designation as a facility authorized to perform approval tests must be submitted to the Commandant (CG-ENG-3), Attn: Systems Engineering Division, U.S. Coast Guard Stop 7509, 2703 Martin Luther King Jr. Avenue, SE., Washington, DC 20593-7509.
(b) Each request must include the following:
(1) Name and address of the facility.
(2) Each type of equipment the facility proposes to test.
(3) A description of the facility's capability to perform approval tests including detailed information on the following:
(i) Management organization including personnel qualifications.
(ii) Equipment available for conducting sample analysis.
(iii) Materials available for approval testing.
(iv) Each of the facility's test rigs, if any.
(c) The Coast Guard reviews each request submitted to determine whether the facility meets the requirements of paragraphs (g)(1) through (g)(4) of this section.
(d) If the facility meets the requirements in paragraphs (g)(1) through (g)(4) of this section, they must obtain 12 samples containing mixtures of oil in water that are within a 10-to-30 ppm range that can be verified by an independent third-party source mutually acceptable to the applying lab and the Coast Guard prior to verification.
(e) The facility must measure the oil content of each sample using the method described in Sec. 162.050-39 and report the value of each of the 12 measurements to the Commandant (CG-ENG-3), Systems Engineering Division, 2100 2nd St., SW., Stop 7126, Washington, DC 20593-7126.
(f) The measurements must meet the following criteria:
(1) Except as provided in paragraph (f)(2) of this section, the absolute value of Tn for each measurement, as determined by the American Society for Testing and Materials, ``Standard Practice for Determination of Precision and Bias of Methods of Committee D-19 on Water'', D 2777 (incorporated by reference, see Sec. 162.050-4), must be less than or equal to 2.29 at a confidence level of 0.05.
(2) The absolute value of Tn for one measurement may exceed 2.29 if the Tn values for the other eleven measurements are less than or equal to 2.23 at a confidence level of 0.05. If the Tn value for one measurement exceeds 2.29, that measurement is not used in the method described in paragraph (f)(3) of this section.
(3) The absolute value of Xd must be smaller than u based on the following analysis of paired observations:
(i) Calculate the value of Xd and Sd. This is the mean and standard deviation, respectively, of the differences between the known sample concentrations and the values obtained by the facility with their equipment. The value of Xd for the 12 measurements described in paragraph (e) of this section, or for 11 measurements if paragraph (f)(2) of this section applies, must be within the range 1 <=Xd <= + 1.
(ii) Determine the appropriate critical value of the Student's t-distribution with (n-1) degrees of freedom for a confidence level of [alpha] = 0.01. If all 12 samples meet the criteria of paragraph (f)(1) of this section then (n-1) = 11 and the critical value,[GRAPHIC] [TIFF OMITTED] TR16JA09.018 is 3.106. If paragraph (f)(2) of this section applies, then (n-1) = 10 and[GRAPHIC] [TIFF OMITTED] TR16JA09.019
= 3.169.
(iii) Compute the value of u, where
[GRAPHIC] [TIFF OMITTED] TR16JA09.020
where n = 12 if all samples meet the criteria of paragraph (f)(1) and n = 11 if paragraph (f)(2) applies.
(iv) Compare the absolute value of Xd to the value of u. If [bond]Xd[bond] Sec. 162.050-17 Separator test rig.
(a) This section contains requirements for test rigs used in approval testing of separators. A diagram of a typical test rig is shown in Figure 162.050-17(a).
FIGURE 162.050-17(a)--SEPARATOR TEST RIG[GRAPHIC] [TIFF OMITTED] TR16JA09.005
(b) Each mixture pump on a test rig must--
(1) Be a centrifugal pump capable of operating at 1,000 revolutions per minute or more;
(2) Have a delivery capacity of at least 1.5 times the maximum throughput at which the separator being tested is designed to operate;
(3) Have a maximum delivery pressure that is equal to or greater than the maximum influent pressure at which the separator is designed to operate; and
(4) Have either bypass piping to its suction side or a throttle valve or orifice on its discharge side.
(c) The inlet piping of the test rig must be sized so that--
(1) Influent water flows at a Reynolds Number of at least 10,000;
(2) The influent flow rate is between one and three meters per second; and
(3) Its length is at least 20 times its inside diameter.
(d) Each sample point on a test rig must meet the design requirements described in Figure 162.050-17(d) and must be in a vertical portion of the test rig piping.
FIGURE 162.050-17(d)--SAMPLE POINT [GRAPHIC] [TIFF OMITTED] TR16JA09.006 [CGD 76-088a, 44 FR 53359, Sept. 13, 1979, as amended by USCG-2004-18939, 74 FR 3384, Jan. 16, 2009]