The control requirements in this section apply to any centrifugal
compressor and reciprocating compressor subject to this division.
(1) If routing to a control device or routing to a
process, the volatile organic compounds (VOC) vapors must be routed
from the wet seal fluid degassing system or rod packing through a
closed vent system. The closed vent system must be designed and operated
to route all gases, vapors, or fumes from the wet seal fluid degassing
system or rod packing to the control device under normal operation.
The closed vent system must operate under negative pressure at the
inlet for vapors.
(2) A compressor must be equipped with a seal cover
that forms a continuous impermeable barrier over the entire liquid
surface area, and the cover must remain in a sealed position (e.g.,
covered by a gasketed lid or cap) except during periods necessary
to inspect, maintain, repair, or replace equipment.
(3) The owner or operator shall control VOC emissions
from a centrifugal compressor wet seal fluid degassing system or reciprocating
compressor rod packing properly using one of the following controls.
(A) A control device, other than a device specified
in subparagraphs (B) and (C) of this paragraph, may be used and must
maintain a VOC control efficiency of at least 95% or a VOC concentration
of equal to or less than 275 parts per million by volume (ppmv), as
propane, on a wet basis corrected to 3% oxygen. The 95% VOC control
efficiency and 275 ppmv VOC concentration are calculated from the
gas stream at the control device outlet.
(i) The control device must be operated at all times
when gases, vapors, or fumes are vented from the closed vent system
to the control device. For a boiler or process heater used as the
control device, the vent gas stream must be introduced into the flame
zone of the boiler or process heater. Multiple vents may be routed
to the same control device. Control devices and closed vent systems
must be in compliance with §115.178 of this title (relating to
Monitoring and Inspection Requirements) and §115.179 of this
title (relating to Approved Test Methods and Testing Requirements).
(ii) Control devices must operate with no visible emissions,
as determined through a visible emissions test conducted according
to United States Environmental Protection Agency (EPA) Method 22,
40 Code of Federal Regulations (CFR) Part 60, Appendix A-7, Section
11, except for periods not to exceed a total of one minute during
any 15-minute observation period.
(B) A flare may be used and must be designed and operated
in accordance with 40 CFR §60.18(b) - (f) (as amended through
December 22, 2008 (73 FR 78209)). The flare must be lit at all times
when VOC vapors are routed to the flare. Multiple vents may be routed
to the same control device.
(C) VOC emissions may be routed to a process if the
emissions are compatible with the process and would be retained within
the process. Routing to a process is considered equivalent to a 95%
control efficiency.
(D) The reciprocating compressor rod packing may be
replaced on or before the compressor has operated for 26,000 hours
from the most recent rod packing replacement. The number of hours
the compressor operates must be continuously recorded beginning on
the appropriate compliance date in §115.183 of this title (relating
to Compliance Schedule).
(E) The reciprocating compressor rod packing may be
replaced within 36 months from the most recent rod packing replacement
beginning from the appropriate compliance date in §115.183 of
this title.
(4) The following requirements apply to a bypass installed
on a closed vent system able to divert any portion of the flow from
entering a control device or routing to a process.
(A) A flow indicator must be installed, calibrated,
and maintained at the inlet of each bypass. The flow indicator must
take a reading at least once every 15 minutes and initiate an alarm
notifying operators to take prompt remedial action when bypass flows
are present.
(B) Each bypass valve must be secured in the non-diverting
position using a car-seal or a lock-and-key type configuration.
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