StacksVerified U.S. regulatory reference

43 CFR §3175.142

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
  1. (a)Instantaneous flow rate. The instantaneous flow rates must meet the criteria in § 3175.141(d) for each test identified in Table 1 to this section, using the gas compositions identified in Table 2 to this section, as prescribed in Table 1 to this section.
  2. (b)Sums and averages.
    1. (1)Fixed input values from test 2 in Table 1 to this section must be applied for a period of at least 24 hours.
    2. (2)At the conclusion of the 24-hour period, the following hourly and daily values must meet the criteria in § 3175.141(d):
      1. (i)Volume;
      2. (ii)Integral value;
      3. (iii)Flow time;
      4. (iv)Average differential pressure;
      5. (v)Average static pressure; and
      6. (vi)Average flowing temperature.
  3. (c)Other tests. The following additional tests must be performed on the flow-computer software:
    1. (1)Each parameter of the configuration log must be changed to ensure the event log properly records the changes according to the variables listed in § 3175.104(c); and
    2. (2)Inputs simulating a 15 percent and 150 percent over-range of the differential and static-pressure transducer's calibrated span must be entered to verify that the over-range condition triggers an alarm or an entry in the event log.