1. (1) The requirements of this section apply to centrifugal natural gas compressors located at natural gas transmission compressor stations, and natural gas underground storage facilities.

2. (2) The requirements of this section do not apply to centrifugal natural gas compressors that operate fewer than 200 hours over a rolling 12 month period total provided that the owner or operator:

   1. (i) maintains a non-re-settable hour meter for operation; and
   2. (ii) maintains a record, for a minimum of five years, of the operating hours per month; and
   3. (iii) provide a rolling 12 month total calculation of hours to the department once per year.
3. (b) Beginning January 1, 2023, centrifugal compressors with wet seals shall control the wet seal vent gas with the use of a vapor collection system as described in Subpart 203-8 of this Part or shall replace the wet seal with a dry seal.
4. (c) Beginning January 1, 2023, components on driver engines and compressors that use a wet seal or a dry seal shall comply with the LDAR requirements specified in Subpart 203-7 of this Part.

5. (d) The compressor wet seal shall be measured annually by direct measurement (high volume sampling, bagging, calibrated flow measuring instrument) while the compressor is running at normal operating temperature in order to determine the wet seal emission flow rate using one of the following methods:

   1. (1) Vent stacks shall be equipped with a meter or instrumentation to measure the wet seal emissions flow rate.
   2. (2) Vent stacks shall be equipped with a clearly identified access port installed at a height of no more than six feet above ground level or a permanent support surface for making wet seal emission flow rate measurements.
   3. (3) If the measurement is not obtained because the compressor is not operating for the scheduled test date and the remainder of the inspection period, then testing shall be conducted within 14 days of resumed operation. The owner or operator shall maintain for at least five years, and make available upon request by the department, a copy of operating records that document the compressor hours of operation and run dates and a signed statement from the responsible official in order to demonstrate compliance with this requirement.

6. (e) A compressor with a wet seal emission flow rate greater than 3 scfm, or a combined flow rate greater than the number of wet seals multiplied by 3 scfm, shall be successfully repaired within 30 days of the initial flow rate measurement.

   1. (1) An extension to the 30 day deadline may be granted by the department if the owner or operator can demonstrate that the parts or equipment required to make necessary repairs have been ordered and the owner or operator notifies the department as specified in section 203-10.3 of this Part to report the delay and provides an estimated time by which the repairs will be completed.
7. (f) If parts are not available to make the repairs, the wet seal shall be replaced with a dry seal no later than 18 months after the exceeding measurement is made.
8. (g) The owner or operator shall maintain for at least 5 years, a record of the flow rate measurement and shall report the result to the department within 60 days after completed.
9. (h) A centrifugal natural gas compressor with a wet seal emission flow rate measured above the standard specified in subdivision (e) of this section and which is a critical component, shall be successfully repaired by the end of the next scheduled process shutdown or within 12 months from the date of the initial flow rate measurement, whichever is sooner.

(a) Applicability.